WO2003076804A1

WO2003076804A1 - A magnetism actuator with cylindrical magnet and steps plunger type permanent magnet

Info

Publication number: WO2003076804A1
Application number: PCT/CN2002/000159
Authority: WO
Inventors: Kyung-O Gu
Original assignee: Kyung-O Gu
Priority date: 2002-03-14
Filing date: 2002-03-14
Publication date: 2003-09-18
Also published as: AU2002242585A1

Abstract

A magnetism actuator includes a housing, a cylindrical permanent magnet defining a through hole in the center, a plunger type permanent magnet whose maximal radial external profile mates with said hole, and a slide rail. Said cylindrical magnet is located in the housing, and said plunger type permanent magnet can go through and reciprocate within the hole. Moreover, said reciprocation of the plunger type magnet may go along the slide rail. Wherein, the plunger type permanent magnet is a combination of a plurality of discal permanent magnet in turn and the combination is a steps type permanent magnet. In addition, external profile of the each steps in radial direction extends outwards from the centreline of the plunger type magnet to the cylindrical magnet until it can mate with said central through hole. Thus, the magnet actuator could increase the magnitude of magnetic force which can make said magnet motion depending on a effect created by magnetic lines' concentration on the top end.

Description

Cylinder-stepped plunger type permanent magnet magnetic transmission mechanism

The present invention relates to a transmission mechanism using magnetic force, and more particularly, to a magnetic transmission mechanism that employs a cylinder-shaped permanent magnet that cooperates with each other and a stepped plunger-type permanent magnet that linearly reciprocates in it. A magnetic transmission mechanism that transmits the magnetic force between two permanent magnets to rectilinear motion. Background technique

In recent years, transmission mechanisms using magnetic force between permanent magnets and / or electromagnets as power transmission have been increasingly widely adopted. For example, in electric vehicles, electric bicycles, refrigerators and compressors of air conditioners and other mechanical equipment, various types of permanent magnets and / or electromagnets have been used as transmission mechanisms. Korean Publication No. 2001-037629, patent document entitled "Drive Device for Electric Auto"; Korean Publication No. 1999-036221, Patent Document entitled "Piston Drive Device for Electric Motor Using Electromagnet"; Korea Publication No. 1996-021347, patent document entitled "Electric Motor Device for Electric Vehicles"; Chinese patent number ZL 00242064.1, published patent document entitled "DC electromagnetic plunger pump"; Chinese application number 951133461.1, Published patent documents entitled "A kind of magnetic drive device for pumps"; Chinese patent number ZL 95224863.8 and published patent documents entitled "Magnetic Compressor" all disclose the use of permanent magnets and / or electromagnets. Transmission mechanism.

However, in the transmission devices using permanent magnets and / or electromagnets disclosed in these documents, it is necessary to use an electromagnet to work in conjunction with a magnetizable body or a permanent magnet, and the electromagnet needs to pass a strong current during the work process. These currents generate a lot of heat, not only wasting energy, but also not conducive to the operation of mechanical equipment, and often cause mechanical equipment to fail due to overheating.

In addition, we know that in the reciprocating magnetic mechanism using an electromagnet, The change of the current direction of the electromagnet changes the direction of the magnetic force of the electromagnet, thereby changing the direction of movement of the reciprocating magnet. If two permanent magnets are used in conjunction with a magnetic mechanism, the direction of the magnetic force will not change at a certain relative position. Therefore, after reaching the extreme position, an external force must first be used to push a permanent magnet through a section. The distance that the magnetic force acts in the opposite direction to its direction of movement. For ordinary permanent magnets, this stroke is half of the entire reciprocating stroke. Then, the magnetic force between the two permanent magnets can be used to push the moving permanent magnets to continue to move. Thus, in fact, a mechanism for reciprocating motion is needed to promote the magnetic mechanism using a permanent magnet, and the energy consumed by the mechanism and the stroke of the movement are the same as when the magnetic mechanism is not used. Obviously, it doesn't make sense to do so.

Therefore, there is a need for a transmission mechanism that completely uses a permanent magnet instead of a magnetic transmission mechanism using an electromagnet. Such a magnetic mechanism not only does not cause the problem of wasted energy and overheating of mechanical equipment when using an electromagnet, and can fully utilize energy. There is no limit to the continuous working time. Moreover, after the moving permanent magnet reaches the end point, it is necessary to use an external force to push it through. The magnetic force acting in the direction opposite to the direction of its movement is short. In this way, the permanent magnet in the magnetic mechanism is started to move. The mechanism requires only a short stroke and a small force to make the permanent magnet that reaches the end point pass the magnetic force acting in the section opposite to its direction of movement, and then it can use the magnetic force between the permanent magnets to push the permanent magnet. The magnet continued to move. Summary of the Invention

The purpose of the present invention is to meet this need, and to provide a cylinder-stepped plunger type permanent magnet magnetic transmission mechanism, which can be used to transmit reciprocating motion to the working mechanism. No electromagnet is used, only the permanent magnet is used. No matter how long you work, the machine will not overheat. Furthermore, since the stepped plunger type permanent magnet is used, since the magnetic field lines are concentrated at the tip, the magnetic field lines concentrated at the step tip can be used to increase the magnetic force interacting between the permanent magnets. In addition, when the moving permanent magnet reaches its end point, the required starting point for moving in the opposite direction The power is small, and the distance that the magnetic force to be passed through is opposite to the direction of its movement, but the distance that can be used to promote the movement of the permanent magnet by magnetic force is very long.

Another object of the present invention is to provide a reciprocating air cylinder-stepped plunger type permanent magnet magnetic transmission mechanism. The stroke of the reciprocating permanent magnet of this mechanism can be changed by changing the stepped plunger type permanent magnet. The number of steps and the height of the magnets are adjusted by changing the length of the entire plunger-type permanent magnet.

To achieve the above object, the magnetic transmission mechanism of the present invention includes: a machine base; a cylinder-type permanent magnet fixed on the machine base and having a through hole in the center; a plunger-type permanent magnet having a maximum radial outer contour Cooperating with the through hole on the cylinder-type permanent magnet, it can pass through the central through-hole and reciprocate in the central through-hole; and a guide rail for reciprocating movement of the plunger-type permanent magnet, characterized in that the post Plug-type permanent magnets are composed of several disc-shaped permanent magnets with similar shapes and gradually changing outer contours. The combined permanent magnets are stepped at both ends. The outer contour of each step is the length of the plunger-type permanent magnet. The midpoint of the direction gradually increases toward both ends until it matches the size of the above-mentioned central through hole.

The steps at the two ends of the plunger-type permanent magnet at the above positions may be symmetrical or asymmetrical.

The shape of the outer contour of the plunger-type permanent magnet may be various common shapes such as a circle, a rectangle, a hexagon, an octagon, and the like.

The fit clearance between the outline size of the central through hole on the cylinder type permanent magnet and the maximum outer outline size of the plunger type permanent magnet is not more than 1 mm.

The height of each step of the stepped plunger-type permanent magnet in the axial direction (that is, the thickness of each disc-shaped permanent magnet) and the number of steps depend on the total length of the stroke required by the stepped-plunger permanent magnet The variation is generally between 3 and 50 millimeters, and the dimensional difference in the radial direction of each of the adjacent steps is 2B, and B = 0.5 to 15 millimeters.

In order to reduce the impact force of the plunger-type permanent magnet during reciprocating motion, make full use of the permanent magnet Compression inertia at high speed can be provided with compression springs at both ends of the plunger-type permanent magnet. On the one hand, it can reduce the impact force of the permanent magnet when it moves. On the other hand, it can also use the potential energy accumulated when the spring is compressed to help it reciprocate. The moving permanent magnet moves back to the city. BRIEF DESCRIPTION OF THE DRAWINGS

1 is a schematic diagram of a symmetrical stepped permanent magnet in a cylinder-stepped plunger-type magnetic transmission mechanism of the present invention, and a schematic diagram of its magnetic pole distribution and magnetic force;

2 is a schematic view of an embodiment of a symmetrical stepped plunger-type magnetic transmission mechanism of a cylinder of the present invention;

3 to 5 are end views showing various outer contour shapes of a symmetric plunger-type permanent magnet; and FIG. 6 is a schematic view of an asymmetric step-shaped permanent magnet in a cylinder-stepped plunger-type magnetic transmission mechanism of the present invention. Best Mode for Carrying Out the Invention

Please refer to FIG. 1. In FIG. 1, the reference sign Mg indicates a permanent magnet of a cylinder type fixed on a machine base, and an upper end is an S pole and a lower end is an N pole. Reference numeral Mw denotes a symmetrical stepped plunger type permanent magnet capable of reciprocating movement in a through hole of a cylinder-shaped permanent magnet Mg, which is sequentially connected by two groups of permanent magnets having similar shapes and gradually changing outer contours. In the group of permanent magnets in the upper part of the figure, the magnetic pole above each permanent magnet is N pole, and the lower pole is S pole. In this group of permanent magnets in the lower part of the figure, the magnetic pole above each of the permanent magnets is S pole, and the lower pole is N pole. The two permanent magnets are connected by a short post, at both ends of the plunger type permanent magnet Mw , Respectively, are connected to the driving rods G, so that they can be moved in a straight line by external power. The attractive and repulsive forces between the cylinder-shaped permanent magnet Mg and the plunger-type permanent magnet Mw will balance each other at a certain relative position, so that it is in a static position.

When the external force pushes the driving rod G to move in a certain direction, the plunger-type permanent magnet Mw faces As the position of the cylinder-shaped permanent magnet Mg changes, the attractive force and the repulsive force between the two are out of balance, so the plunger-type permanent magnet Mw can be pushed toward the external force by the magnetic force (usually the repulsive force). Direction movement. In the case shown in FIG. 1, the plunger-type permanent magnet Mw moves downwards as indicated by the solid arrow.

Please refer to FIG. 2. FIG. 2 shows an embodiment of the cylinder-stepped plunger type magnetic transmission mechanism of the present invention. In Fig. 2, the cylinder-shaped permanent magnet Mg is fixed on the machine base K, and the stepped cylindrical plug-type permanent magnet Mw can reciprocate in its through hole. The drive rod G connected to the stepped plunger type permanent magnet Mw is guided by the guide rail of the machine base K. In a balanced state, when an external force pushes the end of the driving rod G over a short distance, the plunger-type permanent magnet Mw can continue to move by virtue of the magnetic force, thereby driving the working mechanism to move.

In addition, a compression spring may be provided between both ends of the plunger-type permanent magnet Mw and the base K. The function of the spring C is to buffer the impact of the plunger-type permanent magnet Mw on the one hand, and on the other hand, it also The kinetic energy of the plunger-type permanent magnet Mw moving at high speed can be stored and used to push the plunger-type permanent magnet Mw for a return motion.

The above-mentioned plunger-type permanent magnet Mw may also be asymmetrical at both ends. At this time, in the reciprocating motion, the pushing force in one direction is larger, and the pushing force in the other direction is smaller.

FIG. 3 shows that the cross-sectional shape of the plunger-type permanent magnet is circular, FIG. 4 shows that the cross-sectional shape of the plunger-type permanent magnet is hexagonal, and FIG. 3 shows that the cross-sectional shape of the plunger-type permanent magnet is octagonal. In short, the cross-sectional shape of the plunger-type permanent magnet can be any shape capable of cooperating with each other. Industrial applicability

The cylinder-by-symbol stepped plunger type permanent magnet magnetic transmission mechanism of the present invention can be applied to various machines for reciprocating motion, for example, various compressors. It has no overheating of the machine; the driving force between the permanent magnets is large; the required starting force to move in the opposite direction is small, and the magnetic force to be passed has a short distance opposite to the direction of its movement; and it can The length of the reciprocating stroke is changed by changing the number of steps and the height of the stepped plunger-type permanent magnet.

Claims

Claim

1. A magnetic transmission mechanism comprising: a machine base; a cylinder type permanent magnet fixed on the machine base and having a through hole in the center; a plunger type permanent magnet having a maximum radial outer contour and the above The through holes on the cylinder-type permanent magnet cooperate with each other and can pass through the central through hole and perform reciprocating movement in the central through hole; and a guide rail guided for the reciprocating movement of the plunger type permanent magnet, characterized in that the plunger type The permanent magnet is composed of several disc-shaped permanent magnets in sequence. The combined permanent magnets are stepped at both ends. The outer contour of each step gradually increases from the center of the plunger-type permanent magnet to the two ends until it communicates with the center. The size of the holes matches.

2. The magnetic transmission mechanism according to claim 1, wherein the steps at the two ends of the plunger-type permanent magnet in the longitudinal direction may be symmetrical or asymmetrical.

3. The magnetic transmission mechanism according to claim 1, wherein the shape of the outer contour of the plunger-type permanent magnet can be various common shapes such as a circle, a rectangle, a hexagon, an octagon, and the like.

4. The magnetic transmission mechanism according to claim 1, wherein the height of each step of the stepped plunger-type permanent magnet in the axial direction (that is, the thickness of each disc-shaped permanent magnet), and the number of steps, The length of the stroke required by the stepped plunger type permanent magnet varies, and is generally between 3 and 50 millimeters. The radial difference between the adjacent steps is 2B, and B = 0.5 to 15 millimeters.

5. The magnetic transmission mechanism according to claim 1 or 2 or 3, characterized in that a fitting gap between a contour size of a central through hole on the cylinder type permanent magnet and a maximum outer contour size of the plunger type permanent magnet is not greater than 1 mm.

6. The magnetic force transmission mechanism according to claim 1 or 2 or 3, characterized in that the two ends of the plunger-type permanent magnet are provided with a permanent magnet that slows down the impact force of the high-speed linear motion, and makes full use of the permanent magnet. Inertia compression spring at high speed.