JPS61280776A - Moving method of magnetic fluid - Google Patents

Abstract

PURPOSE:To move magnetic fluid by partly controlling by applying a magnetic field to the fluid, and heating the fluid locally in the field to move the portion. CONSTITUTION:A magnetic field is applied by a magnet 4 to part or all of magnetic fluid 5. The fluid 5 is locally heated by a laser beam 3 in the magnetic field. Since the fluid 5 of the heated portion loses magnetism at Curie point or nil point, other magnetic fluid flows to the portion, thereby moving the fluid of the heated portion out of the magnetic field. Thus, the fluid 5 is controlled to move, and can be applied to printing indicating, a motor or a piston.

Description

[Detailed description of the invention] [Industrial application field] The present invention utilizes electromagnetic energy and thermal energy.
This invention relates to a method for moving injection fluid.

[Summary of the invention]

In a method for moving an injected fluid, the present invention heats a part of the magnetic fluid to which a magnetic field is applied to reduce the magnetization strength of the magnetic fluid, thereby accumulating electromagnetic energy in a space containing the injected fluid. In order to reduce the increased electromagnetic energy, unheated magnetic fluid and slightly heated magnetic fluid naturally flow into the space, including magnetic fluid heated by the force generated at this time. It moves magnetic fluid.

[Conventional technology]

The prior art is as follows.

α) Create a visceral gradient in the Ia injection fluid and move the La injection fluid.

(2) By applying a magnetic field to a part of a ferromagnetic plate or rod with a relatively low curri point and heating that part, it is possible to generate a plate or rod. Move (3) Apply a magnetic field to the special IJl1g59-1472170 1cla injected fluid to form a magnetic pulp, and magnetically stop the pressure, as needed! The effect of a magnetic valve temporarily by heating a part of the injection fluid? The magnetic fluid is moved by the pressurizing force of the pump.

However, the purpose of JP-A-59-147217 cannot be achieved with the contents described in the specification. In other words, it is simply a combination of names of phenomena without any theoretical or experimental support.

The reason is α) Magnetic valves using magnetic fluid are made by magnetically fixing discontinuous magnetic fluid.

(2) In the case of a continuous or semi-continuous magnetic fluid, if the magnetic field gradient is small, the holding force is only the frictional force between the magnetic fluid and the wall surface and does not generate a large force, and it can withstand the pressure that causes the magnetic ink to fly. I can't do it.

[Problems and Objects to be Solved by the Invention] However, the above-mentioned prior art has the drawback that it is not possible to control and move the magnetic aqueous fluid using thermal energy.

Therefore, the present invention aims to solve this further problem.
The objective is to provide a method for controlling and moving a tB fluid by heating the FiB fluid.

[Means for solving problems]

The method for moving a magnetic fluid according to the present invention is characterized in that a part of the m-injection fluid is moved by applying a magnetic field to a part or the whole of the magnetic fluid and heating the part.

[Effect]

When a magnetic field is applied to a magnetic fluid, the fluid begins to move, and the electromagnetic energy of the space containing the magnetic driftwood, the potential energy and surface energy of the magnetic iK? Movement stops when the amount of internal energy it contains decreases.

FIG. 5 shows the relationship between the magnetic flux and the magnetic field strength H. The straight line OC corresponds to air, and the curve OA corresponds to a ferromagnetic material. When a magnetic field is applied to a ferromagnetic material up to Hl, the ferromagnetic material ('
The tm energy W(1) accumulated in the space containing f: W (1) = area AB Electromagnetic energy w accumulated in the same space as the ferromagnetic material w (
2) is w (2) = area 0CAB. Here, if W (3) = W (2) - Wα], then W (3) - area 0"CA, and W (3) is the energy that moves the magnetic injection fluid when the rim injection fluid magnetic field is applied. Become the source.

The force F acting on the magnetic fluid is logically a bit rough, but if the position of the m injection fluid is X, then lP=δW/δz 611 a m m (1
) It is easily understood from FIG. 5 and equation a) that a force acts on the magnetic driftwood.

Then, heat the ferromagnetic material while applying the magnetic field H1. The magnetic strength of a ferromagnetic material generally becomes weak and reaches O at the Curie point or the Neel point. In FIG. 5, the main magnetic flux decreases from point M to point C. Depending on the degree of heating [ffl
Changes in energy can be controlled.

Let's consider an extreme case. When a ferromagnetic material is heated above one Curie point, the IICIC energy accumulated in that space becomes the same as that of air. This means that heating a part of the ferrofluid that is applied with a magnetic field is an effective way to inject fluid into vIi! This is the same as placing a non-magnetic material having Ik.

Vita-like buoyancy acts on this non-magnetic material and moves it.

Furthermore, when heated to a temperature lower than the Curie point, the same force acts, although the magnitude is different, only the change in magnetization is reduced.

For this reason, the force exerted by the m injection fluid heated in the magnetic field is caused by the unheated or only slightly heated e& injection fluid flowing into the space.

Next, we will discuss the movement of magnetic fluid heated in a magnetic field.

Sail Figure 6 has a slit made of a magnet and a magnetic fluid on the left side of the slit. The magnetic fluid flows in the order of B→C→A.

It passes point A, goes slightly outside the slit, and stops. For example, point A
If you continue to heat the area near point C, the magnetic driftwood will continue to flow in the direction of point E until the remainder of the magnetic fluid is near point B.
If the moving speed is simply compared based on only the heating rate, ignoring surface tension, frictional force, etc., the faster the heating rate, the greater the moving speed becomes. However, there is a limit to its movement speed, and the movement speed reaches its maximum value when non-ah substances are present in the magnetic fluid from the beginning.

Qualitatively speaking, when heated in a pulsed manner, the movement is qualitatively comparable: (1) When heated slowly, the magnetic fluid is pushed out slowly.

(2) When heated at a medium speed, the magnetic fluid is rapidly pushed out, and the heated part has kinetic energy and stretches while balancing the surface tension.

(3) When heated rapidly, the ffl injection #- is pushed out even more rapidly, and the heated part becomes a h1 droplet whose balance with the surface tension is broken and flies away.

〔Example〕

FIG. 1 is a sectional view of a magnetic fluid moving device using a laser as a heating source in an embodiment of the present invention.

A laser beam emitted from a laser oscillator 1 is focused by a lens 2 and irradiated onto the thorny surface of the magnetic fluid 5. The magnetic fluid is injected into the cavity from the input lower. When the ia fluid approaches the slit 5, it is attracted by the magnetic field gradient of the magnet 4 and fills the slit. When the laser beam is irradiated continuously or in pulses, the heated i-injected fluid is ejected from the center, but it comes out in a convex manner. These can be used for printing and display.

Magnetic field strength 5 KOe, low rotation ink saturation magnetic flux density 0.4
KG, 1 Curie point of magnetic fluid of 120℃
When heated to 40℃, 1.8d
Due to the force of yme, it flies at a speed of 3 to 71/sec.

FIG. 2 is a sectional view of a magnetic fluid moving device using an electric resistance element 2 as a heat generation source in Example 1 of the present invention. An electrical resistance element 1 is provided in the space created by the magnet. The electric resistance element is made of an inorganic material with low thermal conductivity, which also serves as its substrate, in order to efficiently use the heat without letting it escape to the magnet 4, i.e., to the magnet 4. Or use a sheet of organic material. Heating is controlled by a power supply circuit 8, and the heated ffl injection fluid is caused to fly or protrude. Only one of the electrical resistance elements may be used, and its dimensions are determined in accordance with the dimensions of the fluid to be moved. If electric resistance elements are provided in pairs and each is set alternately, the magnetic fluid can be moved at a finer pitch.

FIG. 3 is a sectional view of a magnetic fluid moving device using an electric resistance element as a heat source in an embodiment of the present invention.

1 t of electric heating elements are placed on the inner surface of the pipe 2, which has a circular or square cross section.
- installed inside or outside the pipe and filling the entire space with magnetic fluid 5; The electric heating element is surrounded by a magnet 4 for generating a magnetic field and a yoke 6 for forming a magnetic circuit. In some cases, fins 8 are provided for forced cooling of the heated and moving magnetic fluid. The electric resistance element is a separate t
heated by the source control circuit. When the electrical resistance element is heated, the magnetic fluid flows in the direction of the arrow. If the electrical resistance element is heated intermittently, the fluid flows intermittently, and if the electrical resistance element is heated continuously, the fluid flows continuously. For example, if a gear pump is incorporated into the pipe 2, the motion of the magnetic fluid can be extracted as rotational motion.

FIG. 4 is a sectional view of an injected fluid moving device using an electric resistance element as a heat source in the top embodiment of the present invention.

A piston 3 and a piston rod 6 are placed in the pipe 2, and an electric resistance element 1, 1' is provided inside or outside the pipe, and the ffl injection fluid 5.5' is filled. Create a magnet 4.41 that applies a magnetic field to the electric resistance element. When the electric resistance element 1 is heated by a Wt flow, the piston 3 moves to the right, and when a current is applied to the electric resistance element 11, the magnetic fluid 5'
or flows to the left, and the piston 3 moves to the left. Just by heating it, it works in the same way as a hydraulic or air cylinder.

The present invention has been specifically described above with reference to examples.

The magnetic fluid in the present invention refers to a fluid that exhibits ferromagnetism at operating temperatures, and is not limited to a single point.

Therefore, it is clear that magnetic ink, magnetic paint, a-type driftwood, m-type electrolyte fluid, etc. are included.

Thermal energy in the present invention is electrical energy, original energy, and reaction energy is original sonic energy, mechanical friction is! ! It is clear that anything with energy is good.

Further, although a magnet is used to generate the magnetic field in the present invention, a magnetic field generated by a coil can have exactly the same effect. I gave a brief explanation of the magnetic circuit, but what about magnetic flux using a yoke? Increasing the aperture magnetic flux density is of great practical importance.

In the present invention, if the temperature of the tB injection fluid reaches one point or more, no force will be applied at all, so cooling the magnetic fluid is an essential element.

The ferromagnetic material of the magnetic fluid is F#, Fgt compound, c.

, Co compound ferrite, magnetite, Mn-
Al, chromium oxide, Heusler alloy, organic la material.

FM-free magnetic materials, etc.

Furthermore, it is obvious that in the present invention, the direction of the magnetic field may be in the direction of the chair.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to move the magnetic fluid by applying magnetic energy, and this movement of the injected fluid can produce effects such as printing, display, motor, piston, etc. have

[Brief explanation of drawings]

Figure 141 shows one implementation 91 of the at magnetic fluid moving method of the present invention.
Main sectional view showing J 1...Laser source 2a...Condensing lens system 3.1 Ther beam 4...Permanent magnet 5...Slit and magnetic fluid 6...Yoke 7 for magnetic circuit ... Hole Figure 2 is a main sectional view 1 showing an embodiment of the magnetic fluid moving method of the present invention... Electrical resistance element 8... Electrical resistance element power supply circuit Figure 3 shows the magnetic fluid of the present invention One way to move F! rU
This is a main cross-sectional view showing the magnetic fluid circulating therein. 1... Electrical resistance element 2... Pipe 8... Cooling device FIG. 4 shows one implementation of the magnetic fluid moving method of the present invention ff1l
This is a main cross-sectional view shown at t-, which takes out the power from the movement of the FB injection fluid. 1, 1'... Electric resistance element 2... Vibrator 3... Piston 4.4'... Permanent magnet 5... Magnetic injection fluid 611-- Piston shaft Figure 5 is a detailed explanation of the present invention FIG. 3 is a diagram showing the relationship between magnetic flux and magnetic field. FIG. 6 is a sectional view of a model for explaining the manner in which force acts on a magnetic fluid for explaining the present invention in detail. that's all

Claims (1)

[Claims] A method for moving a magnetic fluid, which comprises placing the magnetic fluid in a magnetic field, heating a portion of the magnetic fluid, and moving a portion of the magnetic fluid.