JP3132818B2 - Method for manufacturing rotor of rotary drive device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Industrial application field The present invention is used in chemical engineering, reaction engineering, biotechnology and the like dealing with a gas-liquid system, and particularly, rotationally drives a stirrer or the like when tight stirring is required. The invention relates to a method for manufacturing a rotor of a rotary drive suitable for a source.

(2) Prior Art As a rotor of a stirring device for stirring liquid liquid or gas liquid in a closed container, a portion facing the stator is formed by stacking and fitting a conductor and a magnetic material, and the entire surface is made of a corrosion-resistant material. The applicant has previously proposed a coating coated with the same (Japanese Patent Application No. 1-59).
150).

(3) Problems to be Solved by the Invention The rotor of the stirring device proposed above applies a corrosion-resistant material at the time of coating, and then heats the rotor to perform baking coating. Therefore, at the time of the baking coating, a crack is generated on the end face due to a difference in expansion coefficient between the conductor and the magnetic material,
Cracks occur in the rotor due to the temperature difference during use, and the stirring liquid penetrates into the rotor from there, deteriorating the rotor, or the reactants between the liquid and the rotor flowing out into the container, which deteriorates the stirring accuracy. In addition, there is a problem that the durability of the rotor is reduced.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method of manufacturing a rotor of a rotary drive device such as a stirrer, which solves the above problems, prevents cracks in a coating film, and improves the durability of the rotor.

(4) Means for Solving the Problems In order to achieve the above object, the present invention provides a magnetic material enclosing step of closely surrounding at least a magnetic material of a rotor with a conductor having a thermal expansion coefficient larger than that of the magnetic material. And a step of applying a corrosion-resistant material to coat the entire surface of the rotor obtained by the magnetic substance enclosing step with a corrosion-resistant material.

(5) Operation Since the entire periphery of the magnetic body is closely surrounded by a conductor having a coefficient of thermal expansion larger than that of the magnetic body, even if the rotor is heated and cooled when the corrosion-resistant material is coated on the entire surface, the magnetic material is not cooled. The expansion and contraction of the magnetic material in the conductor is covered by the expansion and contraction of the conductor, so that the rotor coating does not crack.

(6) Embodiment One embodiment of a method of manufacturing a rotor according to the present invention will be described below with reference to FIGS.

(1) shows a container, and the container (1) has a concave portion (1
a), and a stator (2) is provided in the recess (1a). (3) indicates a rotor. The rotor (3) is composed of a cup-shaped conductor (3a), and a cylindrical magnetic body (4) is inserted on a side surface facing the stator (2).

Here, the conductor (3a) is made of, for example, an aluminum material having a larger thermal expansion coefficient than the magnetic material (4).

A through hole (3b) is formed in the center of the rotor (3), and a plurality of stirring blades (3c).
Are protruding.

(5) covers the entire surface of the rotor (3) with a film made of a corrosion-resistant material, and forms a protective film for the rotor (3). Here, (1b) indicates a partition wall forming the concave portion (1a), and (A) indicates a liquid.

The conductor (3a) expands and contracts in accordance with the expansion and contraction of the magnetic material (4) even when the rotor (3) having the above structure is coated with a corrosion-resistant material or changes in temperature during use. However, a sufficient stirring effect can be achieved without causing cracks or the like in the coating (5).

 Next, the manufacturing process of the rotor of the present invention will be described.

First, the magnetic body (4) is formed into a pipe shape by cutting or the like as shown in FIG.

Next, as shown in FIG. 3, the magnetic body (4) is moved to the lower mold (7).
And a spacer (8) having the same material or melting temperature as that of the conductor (3a) is inserted between the side wall of the lower mold (7) and the inner wall of the magnetic body (4). The magnetic body (4) is fixed at a predetermined position of (7). Thereafter, the upper mold (6) is mounted on the lower mold (7), and a molten conductor material, for example, aluminum (Al) is injected from the gate (6a).

Next, the upper die (6) and the lower die (7) are cooled and the rotor (3) is released.

Next, as shown in FIG. 4, the entire surface of the removed rotor (3) is coated with a corrosion-resistant material by a known method to form a film. Thus, the desired agitator rotor (3) is completed.

FIG. 5 shows another embodiment of the present invention, in which a stator (2) is provided at the bottom of a container (1), and a projection (1a) is projected from the container at the bottom. Numeral (3) denotes a rotor. The rotor (3) has a disk-shaped conductor (3a) and a donut-shaped magnetic body (4) in the conductor (3a) facing the stator (2).
Is inserted, has a concave portion (3b) in the center, and is loosely fitted to the projection (1a). Further, a plurality of stirring blades (3c)... (3c) are protruded from the upper surface of the rotor (3), and a plurality of through holes (3d). (5) is a coating made of a corrosion-resistant material. In this embodiment, since the rotor (3) has a simple shape, the manufacture of the rotor (3) is extremely easy. In addition, since there is no irregularity in the container (1), operations such as cleaning of the container and replacement of liquid can be performed. It has features such as simplicity and downsizing of the stirrer, and can suppress the occurrence of cracks in the coating, improve stirring accuracy, and improve durability of the rotor (3). .

The rotor made of a magnetic material and a conductor may be closely surrounded by another conductor having a larger thermal expansion coefficient than that of the magnetic material, and the whole may be coated with a coating made of a corrosion-resistant material.

(7) Advantageous Effects of the Invention As described above, according to the present invention, at least the entire circumference of the magnetic body of the rotor is tightly surrounded by the conductor having a larger thermal expansion coefficient than the magnetic body, and the rotor is made of a corrosion-resistant material. Since the entire surface of the conductor is coated, the coating is not cracked due to the difference in expansion and contraction between the conductor and the magnetic material, the stirring accuracy is improved, the durability of the rotor is improved, the handling is easy, and the size can be reduced. Has excellent effects.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of one embodiment of the present invention, FIGS. 2, 3 and 4 are sectional views showing a method of manufacturing a rotor, and FIG. 5 is a longitudinal sectional view showing another embodiment. is there. (1b) Partition wall (2) Stator (3) Rotor (3a) Conductor (4) Magnetic body (5) Coating

Claims (1)

(57) [Claims] 1. A magnetic substance enclosing step for surrounding at least a magnetic substance of a rotor in close contact with a conductor having a thermal expansion coefficient larger than that of the magnetic substance, and a rotor obtained by the magnetic substance enclosing step is entirely covered with a corrosion-resistant material. A method for manufacturing a rotor of a rotary drive device, comprising a step of applying a corrosion-resistant material for coating.