JPH0438492Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a magnetic fluid manufacturing device, and in particular,
The present invention relates to an apparatus for producing a magnetic fluid, in which vapor produced by heating and vaporizing a ferromagnetic material with a heating device is brought into contact with a liquid containing a surfactant and serving as a medium for the magnetic fluid, and condensed.

[Prior art]

A conventional apparatus for producing this type of magnetic fluid is shown in FIG.

This device consists of a cylindrical drum 2, which has a cylindrical member 23 at both ends held by flanges 24, 24 on the outer periphery of a horizontally placed cylindrical body 22 with an opening 21 formed in the center of the upper part.
Both end boss portions 26, 26 of 5 are O-rings 27, 27
The inner parts of the cylindrical body 22 and the cylindrical drum 25 are provided at one end of the cylindrical body 22. flange part 3
It is designed to be suctioned and evacuated by a vacuum source connected to No. 3 and maintained at a high vacuum.

The outer ends of hollow tubular support members 29, 29 are fixed to the other end of the cylindrical body 22, and the support members 29,
Electrodes 30, 30 are fixed to the inner ends of the crucible 31, and both electrodes 30, 30 support both ends of a heater 32, which is wound around the outer circumference of the crucible 31. The ferromagnetic material placed in the forming position and housed in the crucible 31 is passed through the hollow tubes of the supporting members 29 and 29 to the electrode 3 from the outside.
A current applied between 0.0 and 3.0 degrees flows through the heater 32, causing heating and evaporation.

Further, a liquid 36 containing a surfactant and serving as a magnetic fluid medium is stored outside the cylindrical drum 25, and as the cylindrical drum 25 rotates, this liquid 36 forms a coating on the inner circumferential surface of the cylindrical drum 25. The ferromagnetic material adheres to the ferromagnetic material and rises above the crucible 31, where it comes into contact with the vapor of the ferromagnetic material evaporating from the crucible 31 and condenses.

Then, the vapor and liquid of such ferromagnetic material 3
By continuing the contact and condensation with 6 for a required period of time, a highly magnetized magnetic fluid can be obtained.

[Problem that the invention attempts to solve]

However, in such a conventional crucible, the inside of the cylindrical body 22 and the cylindrical drum 25 in which the ferromagnetic material is located in the crucible 31 is evacuated and maintained in a high vacuum. 31
When the ferromagnetic material contained in the cylindrical body 22 is heated and evaporated to produce a predetermined magnetic fluid, the cylindrical body 22
and releasing the high vacuum inside the cylindrical drum 25 and positioning the ferromagnetic material inside the crucible 31;
After this, the cylindrical body 22 and the cylindrical drum 25
It is necessary to create a high vacuum inside the container, and due to their large volume, it takes time to create a high vacuum.
The problem is that the preparation time becomes long and the overall working time becomes long.

This idea solves the problems of the conventional ones as mentioned above, and by reducing the volume of the high vacuum area, it shortens the time required for preparation and shortens the overall work time. The object of the present invention is to provide a magnetic fluid manufacturing device that can produce magnetic fluids.

[Means for solving problems]

In order to solve the above-mentioned problems, this invention was developed to store ferromagnetic metal elements, ferromagnetic alloys, or ferromagnetic compounds in a horizontal cylindrical container with a high vacuum or low pressure inert gas or oxygen gas atmosphere. A heating device for a ferromagnetic material is provided, and a liquid containing a surfactant and serving as a medium for the magnetic fluid is contained, and the horizontally placed cylindrical container is rotated around its axis to inject the liquid onto its inner circumferential surface. In the magnetic fluid manufacturing apparatus, the vapor of the ferromagnetic material evaporated by the heating device is brought into contact with and condensed while forming a film of the ferromagnetic material. A horizontal cylindrical body having an axis that coincides with the horizontal cylindrical container and a part facing outward is provided, and a portion of the upper part of the horizontal cylindrical body located inside the horizontal cylindrical container; An opening is formed in each of the parts located outside, an isolation shutter that can be opened and closed is provided in each opening, and the heating evaporation device for the ferromagnetic material is arranged horizontally inside the horizontally placed cylindrical container. This is a magnetic fluid manufacturing apparatus characterized in that it is movable.

[Effect]

By adopting the above-mentioned means, this invention
Since the horizontal cylindrical body and the horizontal cylindrical container can be placed in a high vacuum state separately, when replenishing the crucible with ferromagnetic material, the high vacuum state of the horizontal cylindrical container must be released. By releasing only the high vacuum state inside the horizontal cylinder where the crucible is located, the volume of the part where the high vacuum state is released is reduced, the time required for preparation is shortened, and the overall This means that the working time can be shortened.

〔Example〕

Embodiments of this invention shown in the drawings will be described below.

FIG. 1 shows an embodiment of the magnetic fluid manufacturing apparatus according to this invention, in which the support tube 1 is
One flange 4 is rotatably supported via a ring and a deep ball bearing 8, and a hole 5 is provided in the center.
the other flange 5 which is rotatably supported with respect to the base plate 6 via a deep ball bearing 8;
A cylindrical member 3 made of Pyrex is provided between the two to form a cylindrical drum 2, and the inside of this cylindrical drum 2 is maintained at a high vacuum by a vacuum source connected to the support cylinder 1. It's becoming like that.

In the hole 5a in the center of the other flange 5,
With the cylindrical body 9 whose tip end is closed inserted,
A flange portion 9a provided on the cylindrical body 9 is airtightly and rotatably supported with an O-ring 7 interposed between the flange portion 9a and the side surface of the other flange 5.

Openings 10 and 11 are formed in the top end and center of the cylindrical body 9, respectively, and hollow tubular support members 12 and 12 are located inside thereof so as to be movable in the horizontal direction. 12,
Electrodes 13, 13 are fixed to the inner ends of the crucible 12, and both electrodes 13, 13 support both ends of a tungsten wire heater 15 wound around the outer circumference of the crucible 14 made of alumina. The ferromagnetic material is heated and vaporized by a current applied from the outside between the electrodes 13 and 13 flowing through the heater 15 through the hollow tubes of the supporting members 12 and 12.

Further, the crucible 14 includes the support member 12,
12 in the horizontal direction in the figure, it is possible to move it horizontally between a position in the cylindrical body 9 facing the opening 10 at the tip and a position facing the opening 11 in the center. In addition, each opening 1
0 and 11 are releasably provided with isolation shutters 16 and 17.

Furthermore, the interior of the cylinder 9 can be brought to a high vacuum by means of a vacuum source connected thereto, and the bottom of the cylindrical drum 2 contains a surfactant and a ferromagnetic fluid. Liquid 1 as a medium for
As the cylindrical drum 2 rotates, this liquid 18 adheres as a film to the inner circumferential surface of the drum 2 and rises, contacts the vapor evaporating from the crucible 14 above the crucible 14, and condenses. It's becoming like that.

Next, the operation of the above will be explained.

First, liquid (for example, alkylpropylene amine added to alkylnaphthalene) 18
is housed inside the cylindrical drum 2, a ferromagnetic material (for example, granular electrolytic cobalt) is housed in the crucible 14, and the inside of the cylindrical drum 2 is maintained at a high vacuum. is maintained in a high vacuum, and the heater 15 is energized to heat the ferromagnetic material in the crucible 14 while the opening 10 at the tip of the cylindrical body 9 is closed with the isolation shutter 16, and further,
The cylindrical drum 2 is moved at a suitable speed (for example, 2 per minute).
Rotate).

At this time, even if the ferromagnetic substance in the crucible 14 evaporates before being stably heated to an appropriate temperature, the evaporated particles are prevented from being taken into the liquid 18 by the isolation shutter 16. Ru.

Then, when the ferromagnetic material in the crucible 14 reaches a stable heating state, the isolation shutter 16 closing the opening 10 at the tip of the cylindrical body 9 is released.

Then, the ferromagnetic substance in the crucible 14 evaporates, and the vapor contacts the liquid 18 attached as a film on the inner peripheral surface of the cylindrical drum 2 and condenses, causing the rotation of the cylindrical drum 2. As the liquid moves downward, it reaches the liquid 18 at the bottom, and if this operation continues for the required time (for example, 30 minutes),
A magnetic fluid with high magnetization is obtained.

When the ferromagnetic material in the crucible 14 evaporates and disappears inside the crucible 14, first, the isolation shutter 16 of the opening 10 at the tip of the cylindrical body 9 is closed, and the support member 12, 12 together with the crucible 14 and by opening the isolation shutter 17 of the central opening 11 of the cylinder 9, the interior of the crucible 14 can be replenished with ferromagnetic material, and At this time, the ferromagnetic substance can be replenished while keeping the inside of the cylindrical drum 2 in a high vacuum state. After replenishment, the crucible 14 is moved to the cylindrical body 9 by the supporting members 12, 12. At the same time, the opening 11 at the center is closed, and in this state, the inside of the cylindrical body 9 is made into a high vacuum state, and then the electrodes 13 are energized, and the opening 10 at the tip is closed. By releasing , evaporation can be started again.

In the above embodiments, the interior of the cylindrical body 9 and the cylindrical drum 2 is maintained at a high vacuum level, but the present invention is not limited to this, and for example, low-pressure inert gas or oxygen gas may be used. It can also be used as an atmosphere.

In addition, the ferromagnetic material is not limited to granular electrolytic cobalt, but includes, for example, ferromagnetic metal elements such as iron, nickel, and cadmium, or chromium,
A ferromagnetic alloy or a ferromagnetic compound containing at least one of manganese and rare earth metals may be used.

In addition, the liquid is not limited to alkylnaphthalene with alkylpropylene diamine added to it, but includes, for example, a low vapor pressure hydrocarbon,
Alkyl diphenyl ethers, polyphenyl ethers, diesters, silicone oils, fluorocarbon oils, etc. are used, and as surfactants, for example, soaps that are salts of carboxylic acids and metals or amines, sorbitan oleate, pentaerythritol oleate, etc. Polyhydric alcohol fatty acid esters such as, alkylaryl sulfonates, sulfonates such as octadecylbenzenesulfonate, and other phosphates, phosphate esters, amine derivatives, etc. can be used.

Further, in the above embodiment, the crucible made of alumina was configured to be heated with a tungsten wire heater, but the crucible is not limited to this, and the crucible may be made of beryllia, for example. Of course, high frequency, infrared or laser heating, electron beam heating, or arc plasma heating may be used.

[Effect of idea]

By configuring this idea as described above,
Only the part of the crucible that is filled with the ferromagnetic material to be heated is kept in a high vacuum state, separate from the part where the liquid is located, so when replenishing the ferromagnetic material, the high temperature of the entire device is reduced. It is very efficient because it can be refilled without breaking the vacuum state, and at the beginning of heating the crucible,
Since the gas generated at that point can be prevented from reaching the liquid by the presence of the isolation shutter, it has excellent effects such as being able to obtain a magnetic fluid with high magnetization.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing a magnetic fluid manufacturing device according to this invention, and FIG. 2 is a schematic diagram showing a conventional device. 1... Support cylinder, 2, 25... Cylindrical drum,
3, 23... Cylindrical member, 4, 5, 24, 33...
Flange, 5a... Hole, 6... Substrate, 7, 27...
...O ring, 8...Deep ball bearing, 9, 22...Cylindrical body, 9a...Flange part, 10, 11, 21...
...Opening, 12,29...Supporting member, 13,30...
...electrode, 14,31...crucible, 15,32...
Heater, 16, 17... Isolation shutter, 18, 3
6...Liquid, 26...Boss part, 28...Teeth part.

Claims (1)

[Scope of utility model registration request] A heating device for a ferromagnetic material made of a ferromagnetic metal element, a ferromagnetic alloy, or a ferromagnetic compound is installed in a horizontal cylindrical container with a high vacuum or low pressure inert gas or oxygen gas atmosphere. The horizontally placed cylindrical container is rotated around its axis to form a liquid film on its inner circumferential surface, and is heated by the heating device. In the magnetic fluid manufacturing apparatus, the ferromagnetic material vapor is brought into contact with and condensed. A horizontal cylindrical body is disposed, and openings are formed in the upper part of the horizontal cylindrical body at a portion located inside the horizontal cylindrical container and at a portion located outside the horizontal cylindrical container, Each of the openings is provided with an isolation shutter that can be opened and closed, and the ferromagnetic material heating evaporation device is movable in the horizontal direction inside the horizontally placed cylindrical container. Manufacturing equipment.