JPH04207957A - Magnet coupling - Google Patents

Abstract

PURPOSE:To realize easy handling at the time of fabrication, assemblage and dismantling by directing the polarities of permanent magnets mounted on inner and outer rings in the circumferential direction thereby canceling the magnetic force functioning between the inner and outer rings of a magnet coupling. CONSTITUTION:Permanent magnets 8, 11 mounted on inner and outer rings 3, 6 comprise magnetic bodies 14, 20 mounted rotatably in eight cylindrical holes made in tubular permeable bodies 9, 12 disposed, respectively, on the inner and outer surfaces of tubular magnetic bodies 7, 10 constituting the inner and outer rings 3, 6. A lever means for rotating the direction of the magnetic poles of the magnetic bodies 14, 20 is then coupled through a fulcrum and the tubular magnetic bodies 7, 10 of the inner and outer rings 3, 6 are provided, respectively, with means for guiding the operation of the lever means. N and S poles of the permanent magnets 8, 11 are directed in the circumferential direction to cause magnetic function between adjacent permanent magnets thus canceling magnetic forces functioning between the inner and outer rings. According to the constitution, fabrication, assemblage and dismantling can be carried out with no adverse effect of magnetic force resulting in easy handling.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a magnetic coupling that is a power transmission component for rotating equipment, and particularly to a magnetic coupling suitable for use in, for example, a high-capacity magnetic pump. It is related to.

[Prior Art] An example of a conventional magnetic coupling will be described with reference to FIGS. 3 and 4.

FIG. 3 is a schematic longitudinal sectional view taken along the axis of an example of a conventional magnetic coupling, and FIG. 4 is an enlarged sectional view perpendicular to the axis of the magnetic coupling shown in FIG.

FIG. 3 shows a detailed cross section, and the magnetic coupling is connected to the outer shaft 3A connected to the shaft 2 of the drive machine 1.
and an inner shaft 6A connected to the shaft 5 of the driven machine 4.

Fig. 4 shows a cross section perpendicular to the axes of the outer shaft 3A and the inner shaft 6A. It is composed of a plurality of permanent magnets 8A arranged alternately and a magnetically permeable body 9A filled between the permanent magnets 8A.

On the other hand, the inner shaft 6A has a cylinder 10A made of a magnetic material, and N and S poles are arranged alternately in the circumferential direction on the outside thereof.

It is composed of the same number of permanent magnets 11A as the permanent magnets 8A, and a magnetically permeable body 12A filled between the permanent magnets 11A.

In Fig. 3, the outer shaft 3A is passed from the drive machine 1 through the shaft 2.
The rotational power transmitted to the permanent magnet 8A in FIG.
The magnetic force between the magnetic force and the permanent magnet 11A is transmitted to the inner shaft 6A, and is transmitted to the driven machine 4 through the shaft 5 in FIG.

Note that as a mechanism for canceling magnetic force, which is an object of the present invention, for example, US Pat. No. 4,251,791 and US Pat.
The number is mentioned.

[Problems to be Solved by the Invention] The above-mentioned conventional technology has a problem in that iron powder and the like adhere to the permanent magnets of the inner and outer shafts of the magnetic coupling during manufacturing, and it takes time to remove this.

In addition, with the increase in the capacity of magnetic couplings,
When the magnetic force of a permanent magnet is increased, it decomposes.

Bolt near the magnetic coupling during assembly.

There is a problem that the nut may be attracted and damage the worker or the magnetic coupling itself, and that the magnetic force acting between the inner and outer shafts makes disassembly and assembly operations difficult.

The present invention has been made to solve the problems of the prior art described above, and an object of the present invention is to provide a magnetic coupling that is easy to handle during manufacturing and disassembly and assembly.

[Means for Solving the Problems] In order to achieve the above object, the configuration of the magnetic coupling according to the present invention is such that a plurality of permanent magnets are
An outer shaft whose poles are arranged alternately on the inner surface of a cylindrical magnetic body, and a permanent magnet of the same number as the permanent magnets on the inside of this outer shaft, whose N and S poles are arranged alternately on the inner side of the cylindrical magnetic body. In a magnetic coupling consisting of an inner ring placed on the outer surface,
Within the above.

A mechanism is provided to make the magnetic pole direction of each permanent magnet arranged on the outer shaft variable with respect to the inner and outer shafts.

More specifically, each permanent magnet arranged on the inner and outer shafts is an even number of cylinders provided on a cylindrical magnetically permeable body arranged on the outside and inner side of the cylindrical magnetic body constituting the inner and outer shafts, respectively. A magnet body is rotatably mounted in the hole, and a lever means for rotating the magnetic pole direction of the magnet body is connected via a fulcrum.

Each cylindrical magnetic body of the outer shaft is provided with operation guide means for the lever means.

Further, the magnet body has a cylindrical shape formed by embedding a square columnar permanent magnet in a magnetically permeable body.

[Function] When the magnetic coupling configured as described above is used, each time the magnetic pole directions of the permanent magnets installed on the inner and outer shafts are oriented in the radial direction as in the conventional example, the inner and outer shafts are aligned.
Magnetic force is applied between the outer shafts to enable power transmission.

In addition, when necessary, such as during production and disassembly/assembly,
By orienting the magnetic poles of the permanent magnets in the circumferential direction, magnetic force acts between circumferentially adjacent permanent magnets, canceling out the magnetic force acting between the inner and outer shafts of the magnetic coupling. This eliminates the magnetic force between the two.

[Example] An example of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 is a sectional view perpendicular to the axis of a magnetic coupling according to an embodiment of the present invention, and FIG. 2 is a sectional view showing a state in which the magnetic body of FIG. 1 is rotated in the magnetic pole direction. . The arrangement of the machine for transmitting power by means of a magnetic coupling is similar to that shown in FIG.

In FIG. 1, 3 is an outer shaft and 6 is an inner ring.

7 is a cylindrical magnetic body (hereinafter referred to as a cylinder) constituting the outer shaft 3; 8 is a square column-shaped permanent magnet hardened so as to be embedded in a magnetically permeable resin 13; 9 is an inner surface of the cylinder 7; A cylindrical magnetically permeable body 14 rotatably arranged in the magnetically permeable body 9 is rotatably mounted in an even number (eight in the example of FIG. 1) of cylindrical holes provided in the circumferential direction of the magnetically permeable body 9. This magnet body [4] is a cylindrical one formed by embedding a square column-shaped permanent magnet 8 in a resin]3,
4 has its N and S poles arranged alternately, as shown in FIG.

On the other hand, 5 Yu○ is a cylindrical magnetic body (hereinafter referred to as a cylinder) constituting the inner ring 6, 11 is a square column-shaped permanent magnet hardened so as to be embedded in a magnetically permeable resin 19, and 12 is a permanent magnet of the cylinder 10. The cylindrical magnetic permeable bodies 20 rotatably arranged on the outer surface side are an even number (20) provided in the circumferential direction of the magnetic permeable body 12.
This magnet stand 20 is a magnet body rotatably mounted in the same number of cylindrical holes as the magnet bodies 14 (eight in the example shown in FIG. 1).
It has a cylindrical shape formed by embedding a rectangular permanent magnet 11 in a resin 19, and the eight magnet bodies 20 have their N and S poles arranged alternately, as shown in FIG.

Next, 15 is a pin provided at an arbitrary point in the circumferential direction at the end of the magnet body 14, and 16 is an elongated hole with an oval cross section formed in the cylinder 7. Half of the magnet bodies 14 (four in the example shown in FIG. 1) are formed. 17 is
The pins 18 inserted into the long holes 16 are a pair of rods that connect the pins 17 and the pins 15 of the pair of adjacent magnet bodies 14. That is, the rod 18 uses the pin 15.17 as a fulcrum, and when the pin 17 moves guided by the elongated hole 16, the magnet body 14 is rotated, and the N and S poles of the permanent magnet 8 are rotated in the circumferential direction. It functions as a lever means, and the elongated hole 16 functions as its operation guide means.

On the other hand, 21 is a pin provided at an arbitrary point in the circumferential direction at the end of the magnet body 20, and 22 is an elongated hole with an oval cross section formed in the cylinder 10. Half of the bodies 20 (four in the example of FIG. 1) are formed. 23 is a pin inserted into the elongated hole 22; 24 is the pin 23 and the pins 21 of a pair of adjacent magnet bodies 2o;
A pair of rods connecting the two. That is, rod 2
4, the pin 21.23 is the fulcrum, and the pin 23 is connected to the elongated hole 22.
The magnet body 20 is rotated by being guided by the permanent magnet 11, and the long hole 22 functions as a lever means for rotating the N and S poles of the permanent magnet 11 in the circumferential direction.

The operation of the magnetic coupling configured as described above will be explained.

As shown in FIG. 1, the permanent magnets 8 of the outer shaft 3 and the inner shaft 6
When the magnetic poles N and S of the permanent magnet 11 are arranged radially, a magnetic force is generated between the permanent magnet 8 and the permanent magnet 11, and this magnetic force transmits the rotational power of the outer shaft 3 to the inner shaft 6. can.

On the other hand, during manufacturing, disassembly and assembly, the magnetic poles N and S of the permanent magnets 8 and 11 of the outer shaft 3 and inner shaft 6 are rotated in the circumferential direction.

Cylinder 7 of outer shaft 3. and a magnetically permeable body 9 of the outer shaft 3 relative to the cylinder 10 of the inner shaft 6. By rotating the permeable body 12 of the inner shaft 6, the pin 17° on the outer shaft 3 side and the pin 23 on the inner ring 6 side move along the elongated hole 16°22, respectively, and change their positions in the radial direction. Due to the driving force acting on the rod 18 and the rod 24, the magnet body 14 on the outer shaft 3 side. Then, the magnet body 20 on the inner ring 6 side is rotated by 90 degrees with respect to the magnetically permeable bodies 9 and 12, respectively, and the state shown in FIG. 2 is obtained.

As shown in FIG. 2, the magnetic poles N and S of the permanent magnet 8° on the outer shaft 3 side and the permanent magnet 11 on the inner ring 6 side are oriented in the circumferential direction, and the magnetic force is applied to each permanent magnet 8° adjacent to the circumferential direction. The permanent magnet 8 and the permanent magnet 1 interact with each other.
The magnetic force that acts between 1 and 1 can be eliminated. That is, since the magnetic force between the outer shaft 3 and the inner shaft 6 can be canceled out, the problem of magnetic force interfering with work during manufacture, disassembly and assembly is eliminated, and handling is improved.

[Effects of the Invention] As described above in detail, according to the present invention, it is possible to provide a magnetic coupling that is easy to handle during manufacturing and disassembly and assembly.

[Brief explanation of the drawing]

1 is a cross-sectional view perpendicular to the axis of a magnetic coupling according to an embodiment of the present invention, FIG. 2 is a cross-sectional view showing a state in which the magnetic body of FIG. FIG. 3 is a schematic longitudinal sectional view taken along the axis of an example of a conventional magnetic coupling, and FIG. 4 is an enlarged sectional view perpendicular to the axis of the magnetic coupling shown in FIG. 3... Outer shaft, 6... Inner shaft, 7 Cylinder, 8... Permanent magnet, 9... Magnetically permeable body, 10... Cylinder, 11 Permanent magnet,] 2... Magnetically permeable body, 13.19・Resin, 14 ・Magnet, 15. 17... Pin, 16... Elongated hole, 18... Rod, 20... Magnet, 21. 23. Pin, 22...
Long hole, 24...rod.

Claims (1)

[Claims] 1. An outer shaft in which a plurality of permanent magnets are arranged with their N and S poles alternately arranged on the inner side of a cylindrical magnetic body, and In a magnetic coupling consisting of an inner ring in which the same number of permanent magnets are arranged with their N and S poles alternately arranged on the outer surface side of a cylindrical magnetic body, the magnetic pole direction of each permanent magnet arranged on the inner and outer shafts is as follows: A magnetic coupling characterized by having a variable mechanism for the inner and outer shafts. 2. An outer shaft in which a plurality of permanent magnets are arranged with their N and S poles alternately arranged on the inner surface of a cylindrical magnetic body, and the same number of permanent magnets as the above-mentioned permanent magnets are arranged inside this outer shaft, In a magnetic coupling consisting of an inner ring whose N and S poles are alternately arranged on the outer surface side of a cylindrical magnetic body, each permanent magnet arranged on the inner and outer shafts is attached to a cylindrical ring that constitutes the inner and outer shafts. A magnet body is rotatably mounted in an even number of cylindrical holes provided in a cylindrical magnetic permeable body arranged on the outside and inside of the magnetic body, respectively, and a lever is used to rotate the magnetic pole direction of this magnet body. A magnetic coupling, characterized in that the means are connected via a fulcrum, and each of the cylindrical magnetic bodies of the inner and outer shafts is provided with operation guide means for the lever means. 3. The magnetic coupling according to claim 2, wherein the magnet body has a cylindrical shape formed by embedding a square columnar permanent magnet in a magnetically permeable body.