JPH0659396B2 - Non-magnetic liquid stirring method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for stirring a liquid mixture such as a crystal-growing melt in a non-contact and chemically stable state.

2. Description of the Related Art Conventional liquid agitation has been to heat the liquid in the container 1 from the high-frequency coil 6 to generate natural convection, as shown in FIG. In addition, when positively stirring,
As shown in Fig. 9 and Fig. 9, plate-like object 7 or rod-like object 8
Was contacted with the liquid 5 and the object was rotated by an external motor to stir the liquid 5. Further, as an apparatus for stirring using a magnetic field, there is one using an alternating magnetic field as described in JP-A-53-129372.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the conventional method, it is necessary to wash the above-mentioned stirring object every time, and it is troublesome to store or care for the stirring object. Further, it takes time to install the stirring object at a predetermined position so as not to exert a chemical or thermal influence on the liquid.

Furthermore, the rotation of the fluid is greatly affected by the area or shape of the stirring object, and uniform stirring cannot be performed on the entire liquid. In particular, in the case of multi-element LPE (liquid phase epitaxy), the composition of crystals varies depending on the mixing state of the liquid phase, and therefore the reproducibility of growth is not good if the stirring is insufficient. Further, if the stirring object has reactivity with the liquid, the components of the liquid may change.

Further, the liquid adheres to the agitated object, which may change the components and composition of the liquid.

Furthermore, even when a magnetic field is used, if an alternating magnetic field is used, uniform rotary stirring cannot be performed, and the apparatus itself becomes large.

An object of the present invention is to provide a stirring method that solves the above-mentioned problems of conventional ones, can stir a non-magnetic liquid in a non-contact manner, and leads to downsizing of the apparatus itself.

Means for Solving the Problems In order to achieve the above object, the present invention has the following configuration.

That is, for example, the multiphase winding according to the present invention is installed at a position spatially shifted by an appropriate phase around the liquid container. The liquid container here means a container having non-electrical conductivity and non-magnetism, or one having both of the above and having a larger inertia than a liquid, and apparently And it is a container that does not feel the magnetic field.

When a multiphase current is applied to this multiphase winding, a rotating magnetic field is generated as is well known. Then, the substance having electrical conductivity or magnetism reduces the rotating magnetic field and the liquid itself starts to rotate.

That is, particles or liquid having electrical conductivity or magnetism that do not interact with the liquid in the liquid are mixed into the liquid having non-conductivity and non-magnetism. Then, the particles or liquid feel the rotating magnetic field,
The particles or liquid start to rotate by themselves. And
The physical interaction between the particles or liquid and the non-electrically conductive and non-magnetic liquid also causes the non-electrically conductive and non-magnetic liquid to rotate.

Action Using the rotating magnetic field from the multi-phase winding as described above eliminates the need for a stirring object, eliminating the above-mentioned problem, which is the adverse effect of the interaction between the stirring object and the liquid, and uniformly stirring the entire liquid. Since it can be done, there is no fear of causing the crystal structure shift. In addition, when the multiphase current is stopped, the rotating magnetic field disappears, and since the winding and the liquid container or liquid are not in contact with each other, there is no need to care for, store, or move the winding. Will be reduced.

Furthermore, when the area of the loop of the winding is made larger than that of the liquid container, a substantially uniform rotating magnetic field is applied to the entire liquid, and the uneven rotation of the liquid due to the area of the stirring object can be eliminated.

Embodiment A first embodiment of the present invention will be described with reference to FIGS. 1 and 2. In the present embodiment, as shown in FIG. 1 and FIG. 2, the three-phase winding symmetry axis is provided inside the square three-phase windings 2, 3, and 4 which are spatially displaced by 2π / 3. The liquid container is installed so that is aligned with the axis of symmetry of the cylindrical liquid container 1. The loop area of the three-phase winding is larger than the cross-sectional area of the liquid container, and the winding is arranged so as to cover the liquid container 1. Here, the three-phase windings intersect with each other above and below the liquid container 1, and the respective windings are electrically insulated. At the above-mentioned upper and lower intersections, the three-phase windings are pinned so as to have a degree of freedom with respect to rotation around the intersections when the liquid container is taken in and out. First
In the figure, regarding the current direction of the winding, the X symbol indicates the front side to the back side of the paper, and the symbol indicates the front side to the front side of the paper.

Next, when a three-phase current having a phase difference of 2π / 3 is applied to each of the windings 2, 3 and 4, a rotating magnetic field having a frequency equal to the current frequency is generated as is well known. Then, the substance having electrical conductivity or magnetism feels this rotating magnetic field and rotates at the above-mentioned frequency. Moreover, this rotation can be reversed by switching the currents of two of the three phases with a switch. By applying the above principle, it is possible to stir a liquid composed of, for example, a solution for liquid phase growth of a III-V group compound semiconductor with good non-contact and controllability. That is, when a solution for compound phase growth of a compound semiconductor such as Ga or As is mixed with a substance which does not react with the solution and does not affect crystal growth and has conductivity or magnetism, the mixture is caused by the rotating magnetic field. When the substance moves under the guidance of the rotating magnetic field, the contaminant and the solution for liquid phase growth physically interact with each other, and indirectly the solution for liquid phase growth is stirred.

A second embodiment of the present invention will be described with reference to FIGS. 3 and 4. In this embodiment, as shown in FIGS. 3 and 4, the first in-phase rectangular winding 2 is electrically coupled in phase.
The a and 2b are arranged so that the liquid container 1 is sandwiched between them. However, the distance between the in-phase windings 2a and 2b is larger than the diameter of the cylindrical liquid container. Similarly, the second in-phase rectangular windings 3a, 3b and the third in-phase rectangular windings 4a, 4
Place b. However, each in-phase winding pair spatially has a phase shift of 2π / 3. And each 3
In the phase windings, one side of the rectangular winding of the other phase and the opposite side of the current method are grouped together. The three-phase windings intersect each other at the upper and lower sides, but are insulated from each other, and the windings and the liquid container are not in contact with each other and have an appropriate interval.

In this embodiment, since the degree of freedom with respect to the vertical direction of the liquid container or the external object can be obtained during the generation of the rotating magnetic field, the liquid container can be stirred at the same time, and the liquid container can be taken in and out in the lateral direction,
It is possible to take an external object in and out of the liquid.

Then, when a three-phase current is passed through the three-phase winding, the liquid is rotated by the rotating magnetic field.

A third embodiment of the present invention will be described with reference to FIGS. 5 and 6. In this embodiment, as shown in FIG. 5 and FIG. 6, the first in-phase rectangular windings 2a and 2b electrically coupled in phase are arranged so that the liquid container 1 is sandwiched in a sandwich-like shape. To place. However, the distance between the in-phase windings 2a and 2b is smaller than the diameter of the cylindrical liquid container. Similarly, the second in-phase rectangular windings 3a and 3b and the third in-phase rectangular winding 4 are formed.
Arrange a and 4b. However, each in-phase winding pair spatially has a phase shift of 2π / 3. In each of the three-phase windings, one side of the rectangular winding of the other phase and the opposite side of the current direction are grouped together. And 3
The phase windings intersect each other at the upper and lower sides but are insulated from each other, and the windings and the liquid container are not in contact with each other and have an appropriate distance.

In this embodiment, there is no degree of freedom in the vertical direction of the liquid container during liquid stirring, but the liquid can be taken in and out of an external object of an appropriate size. Further, since the space between the in-phase windings is small, the rotating magnetic field is used more effectively than in the second embodiment.

In addition, in the present embodiment, the description has been made only for the three-phase current having high general utility, but this may be a two-phase current or a multi-phase current. In this case, the windings are spatially arranged with a phase difference of 2π / n.

The above has described the configuration of the windings that generate various rotating magnetic fields. In all of these examples, the desired liquid can be freely mixed by mixing the liquid to be stirred with a liquid that does not interact with the liquid and that senses a magnetic field or liquid is mixed into the liquid to be stirred. You can Here, the particles or liquid to be mixed have the same specific gravity as the liquid to be stirred.

EFFECTS OF THE INVENTION As is clear from the above description, according to the present invention, a liquid to be stirred can be rotationally stirred by applying a rotating magnetic field to a liquid or particle that senses a magnetic field. There is no concern that the composition may be deviated if uniform stirring can be performed throughout the liquid in this way, because the composition of the crystals differs depending on the mixing state of the liquid phase in LPE that handles multiple elements. In addition, it has an effect that the stirring work is simplified and that the stirring device itself is miniaturized.

[Brief description of drawings]

FIG. 1 is a top view of the three-phase winding and the liquid in the first embodiment of the present invention, FIG. 2 is a front view of the liquid container in the first embodiment, and FIGS. Top view of winding and liquid in the third embodiment, FIGS. 4 and 6 are front views of the container in FIGS. 3 and 5, and FIGS. 7, 8 and 9 are conventional views. It is a schematic block diagram which shows the stirring method. 1 ... Liquid container, 2, 3, 4 ... 3-phase winding, 5 ... Liquid.

Claims (1)

[Claims] 1. A container which does not reduce the magnetic field is mixed with magnetic particles having a specific gravity similar to that of the non-magnetic fluid in a non-magnetic fluid, and a multi-layer current is passed through the container so that magnetic lines of force pass through the container to rotate. A method for stirring a non-magnetic liquid, which comprises applying a magnetic field to stir the non-magnetic fluid in the container.