JPH03181324A - Continuous mixing agitation device - Google Patents

Abstract

PURPOSE:To facilitate the maintenance and to obtain the small sized device of low cost by using only electromagnetic iron cores, coils, and electric wiring to generate a revolving magnetic field to drive an agitator to revolve without the need of a revolving drive unit. CONSTITUTION:The mixed solution obtained by agitating and mixing >=2 materials introduced into a vessel 1 is discharged to the outside of the vessel 1. In this case, the vessel 1 is formed of non-magnetic material, and magnetic bodies 5 are furnished to the agitator 2 independently disposed in the vessel 1 so as to be rotatable, and >=3 windings 7 for generating revolving magnetic field are disposed to the outer part of the vessel 1 so as to be close to the magnetic bodies 5. As a result, the continuous mixing agitation device is obtained which is simple in construction, easy to maintain, small in size and low in cost.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a mixing and stirring device that stirs and mixes substances in a container by rotating a stirring bar inside the container without contacting the outside. be.

[Prior Art] Conventionally, in the process of manufacturing molded products made of synthetic resin such as polyurethane blades, a rotating shaft is passed through a mixing container from the outside and a stirring bar is rotated as a means for mixing and stirring raw materials.
A device was used to mix liquid substances introduced into a container and discharge the mixture to the outside. The ones shown in FIGS. 7 and 8 are examples of conventional mixing and stirring devices, in which a stirring bar B is rotated by a rotating shaft C in a container A, and an inlet DI
, Dt, substances of different components are introduced into the container A via the pump P.

The mixed liquid stirred and mixed in the container A is discharged from the discharge hole E6X:k
K Medium 7+-Ilpt Ko Hatakeyama Mota, 'No 1b Fik, Su, Kanyama Graduation Piseal F uses an oil seal in Fig. 7, and a metal seal in Fig. 8. In addition to the conventional seals, mechanical seals, O-rings, gland packings, etc. may also be used.

In addition, as a means to rotate the stirrer B without using a rotating shaft and without contact, the stirrer1! An example in which a permanent magnet is attached to child B, the permanent magnet is attached to a rotor provided outside container A, and the rotor is rotated to rotate stirrer B inside container A by the magnetic force of the permanent magnets inside and outside container A. There is.

[Problems to be Solved by the Invention] In the stirring device shown in FIGS. 7 and 8, in which the stirrer inside the container is directly rotated from the outside by a rotating shaft, the bearing seal is damaged due to friction between the rotating shaft and the bearing seal. Seals may become worn out, causing contamination of abrasive powder, contamination of air, leakage of stirred materials, etc. In addition, heating of the substance in the container due to heating of the bearing part due to rotation of the rotating shaft may cause, for example, heat generation. When used in the manufacturing process of polyurethane elastomer, which is a curable resin, the reaction is accelerated by the rise in temperature and gelling foreign matter is generated, which often causes problems such as foreign matter getting mixed into the liquid.

On the other hand, if a permanent magnet is used to rotate the stirrer inside the container without contact, a motor, pulley, belt, etc. installed outside the container are required to rotate the rotor, all of which are low cost. Used for mixing and stirring viscous liquids.

The first invention uses a rotating magnetic field to rotate a stirrer equipped with a magnetic material inside a container, without passing a rotating shaft from outside the container to rotate the stirrer, and without rotating a magnet outside the container. The object is to provide a continuous mixing and stirring device equipped with means for generating.

In addition, the second invention increases the attractive force and repulsive force of the rotating magnetic field outside the container to powerfully rotate a stirrer equipped with a magnetic material, thereby achieving good mixing, especially in the case of high-viscosity liquid stirring. The object of the present invention is to provide a stirring device that allows a liquid to be obtained.

[Means for Solving the Problems] The device of the present invention for achieving the above first object stirs and mixes two or more substances introduced into a container, and discharges the resulting mixed solution out of the container. In the continuous mixing and stirring device, the container is made of a non-magnetic material, and a magnetic material such as a permanent magnet or a magnetic iron core is attached to a stirring bar that is rotatably arranged independently inside the container. In addition, this is a continuous mixing and stirring device in which windings for generating a rotating magnetic field are arranged on the circumference at least 31[!!I] outside the container in close proximity to the magnetic material.

In addition, the device for achieving the second object is provided with an independently rotatable stirrer inside a container formed of a non-magnetic material, and a plurality of permanent magnets are attached to the outer periphery of the stirrer, and Three or more windings for generating a rotating magnetic field are arranged on the circumference so as to sandwich the permanent magnet outside the container, or a back core is formed on a continuous permanent magnet that rotates a rotor equipped with a permanent magnet. This makes it even more effective.

[Function] According to the continuous mixing and stirring device according to claim 1, a rotating magnetic field is generated in the container by inputting a current to three or more windings arranged on the circumference outside the container and electrically controlling the windings. Attractive and repulsive forces are exerted between the stirrer and the magnetic material attached to the stirrer inside the container, causing the stirrer to rotate.

Furthermore, in the continuous mixing and stirring device according to claim 2,
By using multiple permanent magnets attached to the outer periphery of the stirrer and forming a rotating magnetic field outside the container by sandwiching these permanent magnets, the magnetic field is applied from both the top and bottom of the stirrer, and also from the circumference far from the center of rotation. Since suction and repulsion are exerted on the top, the rotating torque is strong and high viscosity substances can be sufficiently stirred and mixed.

[Example] Next, an example of the present invention will be described in FIGS. 1 to 6. The continuous mixing and stirring device shown in FIG. At the bottom of the container l there is an inlet 3.4 for introducing two types of limbs separately, and at the top there is a liquid outlet 8. The stirrer 2 has a tip 2" at the center of the lower surface, and is formed to rotate in contact with the center of the lower inner wall surface of the container l.
The body of the stirrer has a plurality of protrusions of 2 degrees around its circumference to facilitate stirring when the stirrer n = element 2 rotates.

A permanent magnet 5 is attached to the lower surface of the stirrer 2. Electromagnetic iron cores 6 are arranged at three circumferential locations on the lower surface 1' of the container 1, and electromagnetic coils (windings) 7 are wound around each of them.

The two types of limbs a and b are continuously introduced in fixed amounts from the tank into the tank 2 through the inlet 3.4 via the pump P. The stirring bar 2 rotates around the tip 2'' in the container ■ to stir and mix the liquid, and a uniform mixed liquid is discharged from the discharge port 8.
is continuously discharged from The example shown in Figure 2 (a) is
This figure shows an example of a manual control current input to the electromagnetic coil 7 in FIG. 1, and is based on the same principle as a three-phase synchronous motor. Three-phase alternating current R, S is applied to the electromagnetic iron core 6 arranged on the circumference.
When ST is introduced into each electromagnetic coil 7, the magnetic field generates a rotating magnetic field just like rotating a magnet, and the magnetic field rotates once in one cycle of alternating current. The number of rotations N of the magnetic field per minute is called the synchronous speed and is given by N = 12of/P. Since r is the frequency and P is the number of poles, the rotation speed is 3600 rpm in 60 cycles. Three-phase alternating current is shown in Figure 2 (b).

Although the electromagnetic iron core 6 is fixed in this manner, a rotating magnetic force acts on the permanent magnet 5 on the stirring bar 2 side due to the rotating magnetic field, causing the stirring bar 2 to rotate. The rotational speed of the stirrer 2 can be changed by changing the input frequency using an inverter or the like, or by increasing or shifting the number of poles of the electromagnetic iron core. Further, this type of rotation system may be applied in place of the principle of other types of motors such as induction motors.

FIG. 3 shows a stirring device of another embodiment, and the difference from FIG. 1 is that the electromagnetic iron core 6 and the electromagnetic coil 7
It is located at the outer periphery 1" of the container L, and is otherwise the same. Figure 4 is the I of Figure 3.
Two examples showing cross sections along the V-■ line show the relationship between the electromagnetic iron core 6 and the permanent magnet 5 attached to the stirrer 2 (see Figure 3). (b) This shows the case where multiple magnets are used. As shown in FIGS. 4(a) and 4(b), the permanent magnets 5 attached to the stirrer 2 are arranged in a ring shape so that the poles N and S of the magnets alternate. The electromagnetic iron core 6 disposed outside the stirrer 2 also corresponds to the permanent magnet 5 attached to the stirrer 2 (arranged vertically).

Figure 5 shows a continuous mixing and stirring device according to another embodiment.
The illustrated device is composed of a container 1 made of a non-magnetic material and a stirrer 2 provided inside the container 1, and an inlet port 3 for introducing two types of liquids separately into the lower part of the container 1.
4, and there is a limb outlet 8 above. The stirrer 2 has a ball or point 2" in the center of the lower side, which serves as the center of rotation. The body of the stirrer 2 has a plurality of protrusions 2° around the circumference to help stir the liquid. .A magnet 5 with two or more poles protrudes from the outer periphery and is attached to the stirrer 2 in a collar shape.Adjacent magnets have opposite polarities.The outer periphery of the container 1 has a rotating magnet 5 that can be divided into upper and lower parts. The rotor 9 (9a, 9.,) is supported by a deep groove ball bearing lO.The rotor 9 and container 1 are structured as shown in the figure, so by disassembling them,
It is designed to be easy to clean. The rotor 9 is configured to be rotatable around the outside of the container 1 by a rotating means (not shown). Permanent magnets 11 are attached to the rotor 9 to face each other so as to sandwich the flange-shaped magnet therebetween, and the two permanent magnets 11 are connected by a back core 12.

It is desirable that all materials other than the back core I2 and the magnet 5 be non-magnetic materials. The gap between the magnets on the rotor 9 side and the stirrer 2 side is preferably set to 1/2 or less of the thickness of the magnets.

Fig. 6 is a diagram for explaining the arrangement of the magnets 5.11 in Fig. 5, (a) is a partial plan view of Fig. 5, (b) an enlarged cross section from ζ to the Vl-Vl line of Fig. (a). Figure (C) is the same as Figure (B).
This is an enlarged cross-sectional view taken along the line Vl-Vl of FIG. 2, and is compared with FIG. The permanent magnets 11 in Fig. 5 are connected by a back core 12 and arranged on the circumference as shown in Fig. 6 (A).
As shown in Fig. 6(b), a magnetic field is formed as shown by the broken line and the magnetic force is dispersed, but when the back core 12 is included, the magnetic force converges as shown in Fig. 6(b). leakage loss is eliminated, and the attractive and repulsive forces between the magnets are increased.

In this way, when a plurality of liquids are introduced into the containers l of the mixing and stirring device shown in FIG. 5 and the stirring bar 2 is rotated, a rotating magnetic field is formed at a position away from the center of rotation.
Due to the strong rotational force, the liquid introduced into the container 1 is once pushed in the centrifugal direction, circulates around the outside of the permanent magnet, and then moves into the container 1.
During this time, the liquid is sufficiently stirred by the protrusion 2° and a uniform liquid is discharged from the discharge port 8. Note that it is also possible to provide a gap or a through hole between the magnets 5 attached in the shape of a collar, and send the liquid through these to the position of the protrusion 2°.

In particular, when mixing highly viscous liquids, it is possible to use a magnet with strong magnetic force, such as neodymium cobalt, and increase the number of poles of the magnet so that the distance between adjacent magnets is greater than the thickness of the magnet. Therefore, increasing the diameter of the magnet will generate high torque. In addition, in the case of mixing high-temperature liquids, it is preferable to use a samarium-cobalt magnet when the temperature is 70° C. or higher, or to cool the outer magnet 11 with air.

To explain the following using an experimental example, for example, relatively low viscosity polytetramethylene ether glycol (TD I-based prepolymer, viscosity 800 cps at 70°C) was adjusted to 70°C and 100 and crosslinking agent 4 were used. Regarding the polyurethane elastomer obtained by mixing the polyurethane elastomer in a weight ratio of It was confirmed that this was hardly recognized.

In addition, in Experimental Example 2, the viscosity was 303 as a high viscosity prepolymer.
Regarding polyurethane elastomers obtained under the same mixing conditions and crosslinking conditions as in the above-mentioned Experimental Example ① using 0 cps, the results were compared using the stirring device shown in Fig. 5 and Comparative Example 2 obtained using the conventional stirring device. I compared it with
No particular difference was observed.

(Hs Hardness, B breaking strength, EB: elongation at break; TR-6: Tear strength) [Effect of the invention] With the above configuration, the present invention has the following effects.

In the first invention, in order to generate a rotating magnetic field to drive the rotating stirrer, there is no need for a rotational drive device, and only an electromagnetic iron core, a coil, and electric wiring are formed, so the structure is simple. Maintenance is easy, and a continuous mixing and stirring device can be provided in a small size and at low cost. It is mainly suitable for stirring and mixing low viscosity liquids.

In addition, in the second invention, the attractive force and repulsive force in the rotating magnetic field can be strengthened, so it is particularly effective when mixing and stirring high viscosity liquids, and the loss of rotating magnetic force can be improved. have

[Brief explanation of drawings]

1 to 6 are diagrams for explaining the present invention in detail, and FIGS. 7 and 8 are diagrams showing a conventional example. Figure 1 is a front cross-sectional view of the continuous mixing and stirring device, Figure 2 (a) is a system diagram showing the principle of rotation, Figure 2 (b) is an explanatory diagram of three-phase current, and Figure 3 is the 4 (a) and 4 (b) are front sectional views of a continuous mixing and stirring device showing a modification of the figure.
■ Two examples of line sectional views, Figure 5 is a front sectional view showing another embodiment of the continuous mixing and stirring device, Figure 6 (A) is a partial plan view of Figure 5, and Figure 6 (B) is FIG. 6(A) is an enlarged sectional view taken along the Vl-Vl line, FIG. 6(C) is an enlarged sectional view taken along the Vl-Vl line without a back core, and FIGS. 7 and 8 are conventional continuous mixing. It is a front sectional view of a stirring device. l...container, 2...stirrer, 3.4...inlet,
5.11... Permanent magnet, 6... Electromagnetic iron core, 7, Electromagnetic coil, 8... Discharge port, 9... Rotor, 10...
Deep groove ball bearing, 12...back core.

Claims (2)

[Claims] (1) Stirring and mixing two or more substances introduced into a container,
In a continuous mixing and stirring device that discharges the obtained mixed solution out of the container, the container is formed of a non-magnetic material, and a magnetic material is attached to a stirring bar that is independently rotatably disposed inside the container. and a continuous mixing and stirring device, in which three or more windings for generating a rotating magnetic field are arranged on the circumference outside the container in close proximity to the magnetic material. (2) Stirring and mixing two or more substances introduced into the container,
In a continuous mixing and stirring device that discharges the obtained mixed solution out of the container, an independently rotatable stirring bar is provided inside the container formed of a non-magnetic material, and a plurality of permanent A continuous mixing and stirring device equipped with a magnet and having three or more windings for generating a rotating magnetic field arranged outside the container so as to sandwich the permanent magnet, or a rotor equipped with a permanent magnet is rotated.