JPH0438493Y2 - - 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 a magnetic fluid manufacturing device in which vapor produced by heating and evaporating 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]

Conventionally, there is an apparatus for manufacturing this type of magnetic fluid as 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 wound around the outer periphery of the crucible 31 , so that the crucible 31 is connected to the opening 21 in the cylindrical body 22 . 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° flows through the heater 32, thereby heating and evaporating the material.

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 conventional products, since a liquid film is formed on the inner peripheral surface of the cylindrical drum, the crucible is positioned at the center of rotation of the cylindrical drum. The distance from the inner peripheral surface of the cylindrical drum is kept constant to obtain a uniform magnetic fluid, but when the crucibles are positioned at the center of rotation of the cylindrical drum, the number of crucibles increases. In addition, there were problems in that it was not possible to increase the deposition area.

This idea solved the problems of the conventional methods as described above. It increased the number of crucibles, increased the evaporation area, and fixed the distance between each crucible and the evaporation surface to achieve uniform deposition. An object of the present invention is to provide a magnetic fluid manufacturing apparatus capable of manufacturing magnetic fluid.

[Means for solving problems]

In order to solve the above-mentioned problems, this invention was developed to create a container containing a ferromagnetic material made of a ferromagnetic metal element, ferromagnetic alloy, or ferromagnetic compound in a container with a high vacuum or low pressure inert gas or oxygen gas atmosphere. A heating evaporation device is provided, and a liquid containing a surfactant and serving as a magnetic fluid medium is contained, and while the container is rotated to form a liquid film on the inner surface thereof, the heating evaporation device is used. An apparatus for producing a magnetic fluid in which vapor of the evaporated ferromagnetic substance is brought into contact with and condensed, the container being a vertical cylindrical container with a closed top end, and an inner surface of the top end and an inner surface of the top end. An elastic roller is disposed in contact with the liquid, and when the vertical cylindrical container rotates in a horizontal direction about its axis, the elastic roller is driven to rotate and the liquid adheres to the inner surface of the upper end. At the same time, a means is adopted in which the vapor of the ferromagnetic substance evaporated by the heating evaporator comes into contact and condenses.

[Effect]

By adopting the above-mentioned means, this invention
The evaporation area of the ferromagnetic material evaporated by the heating evaporator can be increased, and even if the number of heating evaporators is increased, the distance between them and the evaporation surface remains constant, so a large amount can be deposited in the same working time. This means that it is possible to produce 100% of magnetic fluid.

〔Example〕

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

FIG. 1 shows an embodiment of a magnetic fluid manufacturing apparatus according to this invention, in which the upper end is closed by a flange 1, and the lower end is a cylindrical part that rises upward in the center. A cylindrical drum 5 is formed of a cylindrical member 4 closed by a flange 2 having a cylindrical drum 5. Rotatably supported.

The support tube 9 protruding upward from the hole 8 of the substrate 6 is connected to the cylindrical portion 3 of the cylindrical drum 5.
The inside of the cylindrical drum 5 is sealed via an O-ring 10, and the inside of the cylindrical drum 5 is maintained at a high vacuum by a vacuum source connected to the support cylinder 9. There is.

Further, inside the cylindrical drum 5 via the support cylinder 9, there are support members 11, 11 whose tips extend in the horizontal direction.
The tip of 11 is located between the flanges 1 and 2, and electrodes 12 and 12 are fixed thereto. Between the electrodes 12 and 12 is a tungsten heater 14 wound around the outer periphery of an alumina crucible 13. The ferromagnetic material housed in the crucible 13 is heated and evaporated by a current applied from the outside between the electrodes 12 and 12 flowing through the heater 14 through the hollow tube of the supporting members 11 and 11. I'm starting to do that.

The supporting members 11, 11 each having the crucible 13, the electrodes 12, 12, and the heater 14 at their tips as described above are located inside the cylindrical drum 5.
A plurality of crucibles 13, electrodes 12, 12, and heaters 14 are disposed at the tip between the flanges 1 and 2, and each support member 1
1 and 11 are movable in the horizontal direction inside the support tube 9, and can be taken out from the support tube 9 while maintaining the horizontal state of their tips.

Further, an elastic roller 15 is disposed between the flanges 1 and 2 in a state in contact with the upper flange 1, and the lower end of the elastic roller 15 is connected to a surface active material contained in the bottom of the cylindrical drum 5. As the cylindrical drum 5 rotates, this liquid 16 is deposited as a film on the inner surface of the flange 1 by the elastic roller 15, and the crucible is heated. Crucible 1 above 13
It is designed to condense when it comes into contact with the vapor evaporating from 3.

Next, the operation of the above will be explained.

First, liquid (for example, alkylpropyleneamine added to alkylnaphthalene) 16
is housed in the bottom of the cylindrical drum 5, a ferromagnetic material (for example, granular electrolytic cobalt) is housed in the crucible 13, the inside of the cylindrical drum 5 is maintained at a high vacuum, and the heater 14 is energized. The ferromagnetic material in the crucible 13 is heated, and the cylindrical drum 5 is rotated at an appropriate speed (for example, 2 revolutions per minute).
to rotate horizontally.

When the cylindrical drum 5 rotates, the elastic roller 15 that is in contact with the flange 1 of the cylindrical drum 5 is driven to rotate, so that the liquid contained in the bottom part 1
6 is attached to the inner surface of the flange 1 of the cylindrical drum 5 via an elastic roller 15, and the crucible 1
The ferromagnetic substance in 3 is heated and evaporated, and the vapor contacts the liquid 16 attached as a film to the inner surface of the flange 1 of the cylindrical drum 5 and condenses.
As the cylindrical drum 5 rotates, it is moved downward by an elastic roller 15 driven by the liquid 16 at the bottom, and this movement lasts for a period of time (e.g.
If the process is continued for 30 minutes), a highly magnetized magnetic fluid will be obtained.

Then, when the ferromagnetic material in the crucible 13 evaporates and disappears inside the crucible 13, first, the supporting members 11, 11 are moved in the horizontal direction together with the crucible 13, and also moved downward.
The tips of the supporting members 11, 11, that is, the crucible 1
3 can be taken out from the support tube 9, and thereby the inside of the crucible 13 can be replenished with ferromagnetic material. After replenishment, the crucible 13 is moved to the It moves inside the cylindrical drum 5 and moves between the flanges 1 and 2 of the cylindrical drum 5, and in this state, the inside of the cylindrical drum 5 is brought into a high vacuum state, and then the electrodes 12 and 12 are energized. This allows evaporation to begin again.

In the above embodiment, the interior of the support tube 9 and the cylindrical drum 5 are maintained in a high vacuum, but the structure is not limited to this, and for example, low pressure inert gas or oxygen gas can 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, 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 film esters such as, alkylaryl sulfonates, sulfonates such as octadecylbenzene sulfonate, 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,
Since the surface on which the liquid is attached can be large, a large amount of magnetic fluid can be manufactured at once, and multiple heating evaporators can be placed at a certain distance from the surface on which the liquid is attached. Even if a large amount of ferromagnetic material is evaporated at once, it can be brought into contact with the liquid, and since the distance between each heating evaporator and the surface on which the liquid is attached is the same, the ferromagnetic material can be evaporated uniformly. This method has excellent effects such as being able to produce a large amount of magnetic fluid at once.

[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, 2, 24...flange, 3...cylindrical part,
4, 23... Cylindrical member, 5, 25... Cylindrical drum, 6... Substrate, 7... Deep ball bearing, 8... Hole,
9...Support tube, 10, 27...O ring, 11,
29... Support member, 12, 30... Electrode, 13,
31... Crucible, 14, 32... Heater, 15...
...Elastic roller, 16, 36...Liquid, 21...Opening, 22...Cylindrical body, 26...Boss portion, 28...
Tooth portion, 33...flange portion.

Claims (1)

[Claims for Utility Model Registration] (1) Heating a ferromagnetic substance made of a ferromagnetic metal element, ferromagnetic alloy, or ferromagnetic compound in a container with a high vacuum or low pressure inert gas or oxygen gas atmosphere inside. Along with installing an evaporation device,
The ferromagnetic material is evaporated by the heating evaporator while the container is rotated to form a liquid film on its inner surface, containing a liquid containing a surfactant and serving as a magnetic fluid medium. An apparatus for producing magnetic fluid in which vapor is brought into contact and condensed, wherein the container is a vertical cylindrical container with a closed upper end, and the container is in contact with the inner surface of the upper end and in contact with the liquid. When the vertical cylindrical container rotates in the horizontal direction about its axis, the elastic roller is driven to rotate and deposits the liquid on the inner surface of the upper end, and the heating evaporation device A magnetic fluid manufacturing apparatus characterized in that the evaporated vapor of the ferromagnetic substance contacts and condenses. (2) The apparatus for manufacturing a magnetic fluid according to claim 1, wherein a plurality of heating evaporation devices for the ferromagnetic material are disposed inside the vertical cylindrical container.