Single-coil permanent magnet operating mechanism

Abstract

The utility model discloses a single-coil permanent magnet operating mechanism. The armature, the permanent magnet, the push rod, the upper magnet yoke and the lower magnet yoke are arranged in the machine base, the electromagnet is formed by arranging a coil on the upper portion of the upper magnet yoke, and an opening switch group and a closing switch group are arranged on the side wall of the machine base. The armature is connected with a pushing arm which extends out of the base and can reciprocate between the opening switch group and the closing switch group; by changing the direction of current in the coil, attraction force or repulsive force can be generated between the electromagnet and the permanent magnet, and the push arm is selectively contacted with the opening switch group or the closing switch group to realize opening and closing operation. The utility model has the advantages that the permanent magnet is ingeniously matched with the electromagnet, and the polarity of the electromagnet is changed by changing the direction of the current in the electromagnet coil, so that the operating mechanism is switched on or switched off, the structure is simpler, the required parts are fewer, the reliability and the stability are higher, and the maintenance-free purpose is realized.

Description

Technical Field

[0001] This utility model relates to an operating mechanism for controlling the opening and closing of circuit breakers or contactors, specifically a single-coil permanent magnet operating mechanism. Background Technology

[0002] For the opening and closing operations of circuit breakers or contactors, a dedicated operating mechanism is usually required. Existing conventional operating mechanisms are typically complex in design, large in size, and have poor reliability. This is especially true when the closing position needs to be held, which requires an even more complex structure, further reducing the reliability of the operation. In addition, there are some simple electromagnetic holding structures that can achieve the closing holding effect, but these mechanisms usually require long-term power supply, resulting in high energy consumption and a short service life. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a single-coil permanent magnet operating mechanism that is simple in structure, reliable in opening and closing, and can be held without being energized, thereby effectively reducing energy consumption and extending service life.

[0004] To solve the above-mentioned technical problems, the present invention provides a single-coil permanent magnet operating mechanism, comprising a base, an armature disposed within the base, a permanent magnet embedded within the armature, a push rod connected to the permanent magnet and capable of driving the armature and the permanent magnet to move vertically and synchronously, an upper yoke and a lower yoke respectively disposed above and below the armature, and an electromagnet formed by a coil disposed on the upper part of the upper yoke. A trip switch group and a closing switch group are disposed on the side wall of the base. A push arm extending out of the base and capable of reciprocating between the trip switch group and the closing switch group is connected to the armature. By changing the direction of the current in the coil, an attractive or repulsive force can be generated between the electromagnet and the permanent magnet. The trip switch group or the closing switch group is then selectively contacted by the push arm to achieve tripping or closing operations.

[0005] Two guide posts are provided between the upper and lower magnetic yokes. The armature is fitted on the two guide posts and can reciprocate between the upper and lower magnetic yokes along the guide posts.

[0006] An isolation cover is installed outside the base.

[0007] The permanent magnet is made of neodymium iron boron, a rare earth alloy.

[0008] Both the guide post and the isolation cover are made of non-magnetic metal materials.

[0009] An upper cover plate for covering the permanent magnet is provided above the armature, and a lower cover plate for covering the permanent magnet is provided below the armature.

[0010] The push rod extends above the base through the coil.

[0011] After the permanent magnet is embedded in the armature and covered by the upper and lower cover plates, the armature, permanent magnet and push rod are fixed into a whole by the threads provided on the push rod.

[0012] The side wall of the base is provided with a guide groove adapted to the push arm, and the push arm extends out of the base through the guide groove.

[0013] The advantages of this utility model are:

[0014] Utilizing the properties of opposite poles attracting and like poles repelling, an electromagnet is cleverly constructed by incorporating an armature, permanent magnet, push rod, upper and lower yokes, and a coil on the upper yoke within the base. This mechanism works in harmony with the permanent magnet, changing the direction of the current in the electromagnet coil to alter its polarity, thus enabling the operating mechanism to close or open the circuit. Furthermore, the single-coil structure results in a relatively small height. The attraction of the permanent magnet to the upper and lower yokes locks the operating mechanism in the open or closed position, eliminating the need for mechanical locking and tripping devices. This simplifies the structure, reduces the number of components required, and enhances reliability and stability, achieving maintenance-free operation. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the tripped state in this utility model;

[0016] Figure 2 This is a schematic diagram of the closed state in this utility model. Detailed Implementation

[0017] The single-coil permanent magnet operating mechanism of this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] As shown in the figure, the single-coil permanent magnet operating mechanism of this utility model includes a base 1, an armature 2 disposed within the base, a permanent magnet 3 embedded in the armature, a push rod 4 connected to the permanent magnet and capable of driving the armature and permanent magnet to move vertically and synchronously, an upper yoke 5 and a lower yoke 6 respectively disposed above and below the armature, and an electromagnet formed by a coil 7 disposed on the upper part of the upper yoke. As can be seen from the figure, an upper cover plate 13 for covering the permanent magnet is disposed above the armature 2, and a lower cover plate 14 for covering the permanent magnet is disposed below the armature 2. During installation, after the permanent magnet 3 is embedded in the armature and covered by the upper and lower cover plates, the armature, permanent magnet and push rod are fixed into a whole by the threads provided on the push rod 4. The push rod 4 extends out above the base 1 through the coil. Two guide posts 11 are provided between the upper yoke 5 and the lower yoke 6. The armature 2 is fitted on the two guide posts and can reciprocate between the upper and lower yokes along the guide posts. The function of the guide posts is to ensure that the push rod moves up and down in a straight line. The side wall of the base 1 is provided with a trip switch group 8 and a closing switch group 9. The armature 2 is connected to a push arm 10 that extends out of the base. The side wall of the base 1 is provided with a guide groove that is adapted to the push arm. The push arm 10 extends out of the base through the guide groove and can reciprocate between the trip switch group and the closing switch group. By changing the direction of the current in the coil 7, an attraction or repulsion force can be generated between the electromagnet and the permanent magnet. The trip operation is achieved by the push arm 10 selectively contacting the trip switch group or the closing switch group.

[0019] Furthermore, an isolation cover 12 is provided outside the base 1. The function of the isolation cover is to shield the magnetic field within a sealed metal space, thereby reducing magnetic field leakage.

[0020] Furthermore, the permanent magnet 3 is made of neodymium iron boron, a rare earth alloy material, which has extremely strong coercivity. Even if it is subjected to mechanical impact or comes into contact with ferromagnetic materials, it will not demagnetize. The guide column 11 and the isolation cover 12 are both made of non-magnetic metal materials, and the base, upper yoke, lower yoke and armature are made of soft magnetic materials.

[0021] Its working principle is as follows:

[0022] 1) Closing Process: After the coil is energized, the current in the coil will generate an electromagnetic field. When the magnetic poles of the permanent magnet and the electromagnet are opposite in polarity, there is an attractive force between the permanent magnet and the electromagnet. The permanent magnet drives the push rod to move upward. When the permanent magnet is close to the upper yoke, the push arm pushes the closing position switch group, causing the normally closed node in the closing position switch group to open, cutting off the current in the electromagnet coil. At this time, the electromagnetic field disappears. Under the action of inertia and the attraction of the permanent magnet on the upper yoke, the push rod continues to move upward until the upper cover plate and the upper yoke are in complete contact and then stop. The attraction of the permanent magnet on the upper yoke locks the operating mechanism in the closed state.

[0023] 2) Opening process: After the permanent magnet mechanism coil is energized, when the magnetic poles of the permanent magnet and the electromagnet have the same polarity on opposite sides, a repulsive force exists between them. The permanent magnet drives the push rod to move downward. When the permanent magnet is close to the lower yoke, the push arm pushes the opening position switch group, causing the normally closed node in the opening position switch group to open and cut off the current in the electromagnet coil. At this time, the electromagnetic field disappears. Under the action of inertia and the attraction of the permanent magnet on the lower yoke, the push rod continues to move downward until the lower cover plate and the upper yoke are in complete contact and then stop. The attraction of the permanent magnet on the lower yoke locks the operating mechanism in the open state.

[0024] Of course, the above description is not intended to limit the present utility model, and the present utility model is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should also fall within the protection scope of the present utility model.

Claims

1. A single-coil permanent magnet operating mechanism, characterized in that: The device includes a base (1), an armature (2) installed inside the base, a permanent magnet (3) embedded in the armature, a push rod (4) connected to the permanent magnet and capable of driving the armature and the permanent magnet to move vertically and synchronously, an upper yoke (5) and a lower yoke (6) respectively installed above and below the armature, and an electromagnet formed by a coil (7) installed on the upper part of the upper yoke. The side wall of the base (1) is provided with a trip switch group (8) and a closing switch group (9). The armature (2) is connected to a push arm (10) that extends out of the base and can move back and forth between the trip switch group and the closing switch group. By changing the direction of the current in the coil (7), the electromagnet and the permanent magnet can generate attraction or repulsion. The push arm (10) can selectively contact the trip switch group or the closing switch group to realize the trip and closing operation.

2. The single-coil permanent magnet operating mechanism according to claim 1, characterized in that: Two guide posts (11) are provided between the upper yoke (5) and the lower yoke (6). The armature (2) is fitted on the two guide posts and can move back and forth between the upper yoke and the lower yoke along the guide posts.

3. The single-coil permanent magnet operating mechanism according to claim 2, characterized in that: An isolation cover (12) is provided outside the base (1).

4. The single-coil permanent magnet operating mechanism according to claim 1, 2 or 3, characterized in that: The permanent magnet (3) is made of neodymium iron boron, a rare earth alloy material.

5. The single-coil permanent magnet operating mechanism according to claim 2, characterized in that: Both the guide post (11) and the isolation cover (12) are made of non-magnetic metal materials.

6. The single-coil permanent magnet operating mechanism according to claim 1, 2, 3 or 5, characterized in that: An upper cover plate (13) for covering the permanent magnet is provided above the armature (2), and a lower cover plate (14) for covering the permanent magnet is provided below the armature (2).

7. The single-coil permanent magnet operating mechanism according to claim 6, characterized in that: The push rod (4) extends above the base (1) through the coil.

8. The single-coil permanent magnet operating mechanism according to claim 7, characterized in that: After the permanent magnet (3) is embedded in the armature and covered by the upper and lower cover plates, the armature, permanent magnet and push rod are fixed into a whole by the thread provided on the push rod (4).

9. The single-coil permanent magnet operating mechanism according to claim 8, characterized in that: The side wall of the base (1) is provided with a guide groove adapted to the push arm, and the push arm (10) extends out of the base through the guide groove.

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