JPH11277219A - Stirring and transporting device for conductive high-temperature liquid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To execute the speed control of a conductive high-temp. fluid, to rationalize stages and to improve quality by arranging a permanent magnet on the circumference of a vessel or transporting pipe of the conductive high-temp. fluid or the circumference of a solidified layer enclosing a liquid phase and holding and rotating this magnet by a pressurizing gas. SOLUTION: A rotary cylinder 4 combined with the permanent magnet and a nonmagnetic material is disposed on the circumference of a refractory pipe 2 including molten metal 1 and is supported by hydrostatic air bearings 5, 6 using carbon material. The pressurizing gas is supplied from a gas pipe 7 for the air bearings to the hydrostatic air bearings 5, 6. The rotary cylinder 4 is rotated by the gas injected from a nozzle 10 for rotation. The outer periphery of the rotary cylinder 4 is provided with ruggedness in order to efficiently transfer the kinetic energy of the gas. Air or gaseous nitrogen is supplied as the gas from a gas supply pipe 11 for rotation and executes the cooling of the rotary cylinder 4 as well. As a result, the decreasing of the surface defects by pouring and the capturing and removing of inclusions are executed and the product excellent in the control of the solidified structure and mechanical properties is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to stirring and transporting a conductive high-temperature liquid, such as stirring and transporting molten metal in casting.
The present invention relates to an apparatus for controlling the flow or the solidified structure.

[0002]

2. Description of the Related Art In casting, molten metal must be transported in order to pour molten metal into a mold. In addition, in the case of continuous casting, if the molten metal in the nozzle is caused to rotate and flow, the outflow speed and direction from the nozzle can be controlled, so that entrapment of inclusions and the like can be prevented. further,
The solidification structure can be controlled by stirring and solidifying in the coexistence state of solid and liquid. For these purposes, it has been conventional practice to arrange an electromagnet around a container or a transport pipe to apply an electromagnetic force to molten metal to perform transport, stirring, and the like.
Further, in the laboratory, there is an example in which a permanent magnet is mechanically held by a ball bearing or the like and rotated by an electric motor with respect to stirring of a low melting point alloy such as solder.

[0003]

The use of electromagnets as described above and the use of rolling bearings or plain bearings and rotation by electric motors have the following problems when used in high-temperature liquids such as steel: (1) Electromagnets require water cooling, and if water leaks, there is a danger of steam explosion.
Secondly, if not cooled with water, the temperature rises, so that the rotational expansion increases due to thermal expansion, making rotation difficult or durable. Third, the structure is complicated and difficult to divide in the circumferential direction, and it is not easy to install and maintain around the transport pipes and nozzles. Fourth, the dimensions are large, and it is difficult to install in a narrow space. For this reason, it has not been put to practical use except when there is no such problem, and an apparatus for solving these problems is desired.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a ring or cylinder in which permanent magnets are arranged circumferentially or spirally and a part of which is hollowed out is supported by a gas bearing, and is mounted on the outer periphery. A pressurized gas is blown to rotate. Further, the ring or the cylinder is divided into two or more in the circumferential direction to form a wedge-shaped division surface, and the permanent magnet is arranged on the division surface.

[0005]

The fact that the conductive liquid moves with the rotation or movement of the permanent magnet is the same principle as the rotation of the rotor with the moving magnetic field in the motor, and is a well-known fact. The present invention practically provides a high-temperature conductive liquid (which may contain a solid phase) with a rotational or moving driving force utilizing this principle, and has the following effects. First
In addition, the apparatus of the present invention does not use water and supports, rotates and cools only with gas, so that there is no accident such as steam explosion, and the apparatus is safe. Second, the structure is simple and can be reduced in size because it is supported, rotated and cooled only by gas. For this reason, division in the circumferential direction is easy, and installation and maintenance around existing containers and pipes are easy. Third, since the rotating body and its holding structure are separated by a gas film, the rotation of the rotating body is less affected by thermal expansion. Fourth, since gas injection is performed from the outer peripheral portion, the structure is simple and division is easy.
In addition, since permanent magnets are arranged in a ring or cylindrical shape, the attractive force due to the interaction of the magnets is dispersed in the circumferential direction, and no force acts in the radial direction, making it easy to hold. When the conductive liquid is arranged in one direction, the conductive liquid can move in one direction. Seventh, the inclusion can move in one direction due to the magnetic pressure, and the inclusion can be prevented from being caught. Eighth, since the dividing surface is formed in a wedge shape, the alignment can be automatically performed. Ninth, weight can be reduced by hollowing out a part of the rotating cylinder, and the amount of gas used can be reduced. Tenth, automatic connection of the divided surfaces is possible by the attraction force of the magnet on the divided surface of the rotating cylinder.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 shows an example of the apparatus which is implemented, and shows an example in which the apparatus is arranged around a refractory pipe containing a molten metal.
First, there is an inner cylinder near the pipe, but this is for protecting the rotating cylinder in case of an emergency, and may not be necessary. Is a cylinder combining a permanent magnet and a non-magnetic material (hereinafter referred to as a rotating cylinder).
4,5). The rotating cylinder is supported by a gas static pressure bearing using a carbon material. However, the rotating cylinder may not necessarily be a carbon material, and may be another type of gas bearing. Also,
Is not necessarily a gas bearing because the influence of thermal expansion is small, and other bearings such as a rolling bearing may be used.
These gas bearings are supplied with pressurized gas (air or other gas) from the pipes. Is a bearing support for holding these bearings. The rotating cylinder is ▲ 10 ▼
Is rotated by the gas injected from the nozzle. The rotating cylinder is provided with concavities and convexities for efficiently transmitting the kinetic energy of the gas to the cylinder as described later (FIGS. 3, 4, and 6). (11) is a pipe for supplying a rotating gas.
As the gas, nitrogen or the like may be used in addition to air. This gas and the gas from the gas bearing also cool the rotating cylinder. If cooling is insufficient, a mist mixed with fine water droplets may be used as a rotating gas. ▲ 12
The symbol ▼ supports the bearing support via the bearing support bottom plate.
At the time of initial installation or removal, it is moved to the left and right by a servomotor or the like (16) via a worm gear (15) at the time of initial installation or removal, but it may be moved manually. Spring 17 on the support 12
▼ is attached, and the divided bearing support base is pressed with a constant load when this device is operating. When the device is removed, the wedge can be easily and automatically separated by inserting a wedge with a pneumatic cylinder into the gap between the magnets used on the dividing surface. This cylinder is fixed to the bearing support base.
FIG. 2 shows an embodiment of a rotary cylinder (rotational drive irregularities are omitted).
The cobalt-based permanent magnet is an aluminum alloy, but may be another permanent magnet or a non-magnetic material. , Are magnets installed in the fitting portion, and when the wedge-shaped fitting portion approaches, they are automatically integrated by magnetic force. However, they may be integrated by connecting them with bolts or the like. The form of the fitting portion may be other forms, but by making the fitting portion wedge-shaped, automatic positioning can be performed. In addition, it is not necessary to divide it depending on the installation environment. The number and shape of the driving permanent magnets differ depending on the purpose and use conditions. When a rotational force is applied, a pair may be arranged facing each other, or two pairs may be arranged. To provide propulsion, magnets are arranged spirally as shown in FIG. Figures 4 and 5 show the reduction in the weight of the rotating cylinder to reduce gas consumption for rotation and support.
The place is free as long as rotation, support and division are not hindered.
The shape may be an ellipse, a circle, a rectangle, and others. The shape of the concavities and convexities (which may be penetrated) for efficiently applying the rotational driving force to the rotating cylinder is as shown in FIG.
In addition to the square shape, the shape and the airfoil shown in FIG. 6 may be used.
In addition, it does not necessarily have to be on the entire circumference, and may be locally. Also, as shown in FIG. 5, the bearing may be installed at the center and the bearing may be installed at the end. The optimum values for the shape, size, and location of these irregularities are determined by the mass, rotation speed, frictional force, magnet size, and position of the rotating body. In the examples shown in FIGS. 5 and 6, the rotation speed can be controlled by changing the gas pressure and the injection direction. With the above apparatus, molten aluminum in a pipe having an outer diameter of 50 mm and an inner diameter of 30 mm could be rotated or moved at a speed of about 0.2 m / s.

007

According to the present invention, the speed control and transport of the conductive high-temperature fluid are made possible, which contributes to streamlining the process and improving the quality of products. The quality improvement includes, for example, reduction of surface defects by uniform casting, reduction of inclusion inclusion, or active removal. In addition, the solidification structure can be controlled, and a product having excellent mechanical properties can be manufactured.

[Brief description of the drawings]

FIG. 1 shows an example of an implemented apparatus, in which an apparatus is arranged around a refractory pipe containing a molten metal. Is a protective inner cylinder, is a rotating cylinder combining a permanent magnet and a nonmagnetic material, is a hydrostatic gas bearing, is a gas pipe for a gas bearing, is a bearing support, is a bearing support bottom plate, (10) is a rotary nozzle, (11) ▼ is a gas supply pipe for rotation, ▲ 12
▼ is device support, １３13 ▼ １４14 is ball bearing,
(15) is a worm gear, (16) is a servo motor, and (▲)
17 ▼ denotes a spring.

Fig. 2 shows the structure of a rotating cylinder, especially an example of a divided structure, where is a samarium-cobalt permanent magnet, is an aluminum alloy, is a permanent magnet installed in the fitting portion, and is a wedge-shaped fitting portion. .

FIG. 3 is an example in which a propulsive force is applied to a liquid, in which magnets are spirally arranged.

FIGS. 4 and 5 show irregularities (triangular cross-sectional shape) provided for efficiently applying a rotational driving force to a rotating cylinder and an example in which the cylinder is hollowed out for weight reduction.
Cobalt-based permanent magnets are aluminum alloys, and hollow holes are irregularities.

FIG. 6 shows another example of the shape of the concave / convex portion for giving a rotational driving force.

Claims (8)

[Claims] An apparatus characterized in that a permanent magnet is held and rotated by a pressurized gas disposed around a container or transport pipe of a conductive high-temperature liquid or around a solidified layer containing a liquid phase. . 2. The apparatus according to claim 1, wherein a permanent magnet and a non-magnetic material are combined to rotate as a ring or a cylinder. 3. The apparatus according to claim 1, wherein the apparatus is divided into two or more in the circumferential direction and connected by a magnet, a bolt, or a pressing force from outside. 4. The apparatus according to claim 1, wherein one of the divided surfaces of the divided body has a wedge-shaped male shape in a thickness direction and / or a length direction, and the other has a divided shape. A device with a female shape corresponding to the shape of the surface. 5. The apparatus according to claim 1, wherein said ring or cylinder formed by combining a permanent magnet and a non-magnetic material is partially hollowed out. 6. The apparatus according to claim 1, wherein the outer periphery and the end of the ring or the cylinder combining a permanent magnet and a non-magnetic material are supported by gas bearings.
A device that rotates by injecting a pressurized gas jet in a rotational direction to a part of the outer peripheral portion different from the bearing position. 7. The device according to claim 6, wherein the end of the ring or the cylinder is supported by a bearing such as a rolling bearing or a sliding bearing. 8. A ring or a cylinder in which the permanent magnet according to claim 1, 2, 3, 4, 5, 6, and 7 is combined with a non-magnetic material, wherein a permanent magnet is spirally arranged. Equipment to do.