Magnetic type static contact

Abstract

The utility model discloses a magnetic attraction type static contact, which belongs to the technical field of static contacts, and comprises a static contact body, a contact point and an insulating shell wrapped on the static contact body, the contact point is arranged on the static contact body, the bottom of the static contact body is fixedly connected with a magnetic conductive base, a permanent magnet is fixedly arranged in the magnetic conductive base, and the magnetic attraction type static contact is arranged in the insulating shell. The outer side wall of the magnetic conductive base is fixedly connected with an electromagnetic coil, the electromagnetic coil is wound on the magnetic conductive base, and the magnetic conductive base, the permanent magnet and the electromagnetic coil are all located in the insulating shell; through cooperative use of the magnetic conductive base and the permanent magnet, circuit conduction is realized, and through the action of the electromagnetic coil, the adsorption force to the moving contact is further increased, the magnetic field force is cooperatively provided, the stability of the contact resistance is ensured, the vibration resistance and impact resistance are improved, and the circuit breaker is suitable for complex working conditions.

Description

Technical Field

[0001] This utility model belongs to the field of stationary contact technology, specifically, it relates to a magnetically attracted stationary contact. Background Technology

[0002] A stationary contact refers to a contact in electrical equipment such as switches, relays, and contactors that does not move with the actuator. It is also called a stationary contact (as opposed to a moving contact that moves with the actuator). It is a key component of high-voltage switches and other equipment, used to connect and disconnect circuits. Its service life plays a decisive role in the safe operation of high-voltage switches and even high-voltage power transmission and transformation networks.

[0003] According to the public announcement (CN205069556U), a static contact is disclosed. This technology discloses that "the static contact body includes: an input terminal and an output terminal connected to each other, and a side ear located between the input terminal and the output terminal for inserting and fixing the static contact body. The key technical point is that it also includes a limiting part that forms a heat dissipation gap between the side ear and its insertion position, aiming to provide a static contact that is both firmly and stably fixed and has good heat dissipation effect."

[0004] However, in the aforementioned comparative documents, it is difficult to resist the influence of external interference on the contact adsorption force when facing complex electromagnetic environments, and it cannot ensure that a stable contact adsorption state can be maintained under various working conditions, thus limiting its application in some special occasions with extremely high reliability requirements.

[0005] No effective solutions have yet been proposed to address the problems in the relevant technologies. Utility Model Content

[0006] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a magnetic static contact.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A magnetically attached stationary contact includes a stationary contact body, a contact point, and an insulating shell wrapped around the stationary contact body. The contact point is disposed on the stationary contact body. A magnetically conductive base is fixedly connected to the bottom of the stationary contact body. A permanent magnet is fixedly disposed inside the magnetically conductive base. An electromagnetic coil is fixedly connected to the outer wall of the magnetically conductive base and is wound around the magnetically conductive base. The magnetically conductive base, the permanent magnet, and the electromagnetic coil are all located inside the insulating shell.

[0009] Preferably, a heat sink is fixedly provided on the outer side wall of the stationary contact body, the heat sink is fixedly connected to the insulating shell, and a heat dissipation groove is provided on the heat sink to facilitate heat dissipation of the stationary contact body.

[0010] Preferably, the insulating shell has a filling groove to facilitate the filling of insulating materials.

[0011] Preferably, a shielding sheet is fixed inside the insulating shell to block stray magnetic fields.

[0012] Preferably, a second fixing hole is provided at one end of the stationary contact body, and a first fixing hole is provided at the other end of the stationary contact body, so as to facilitate the installation and use of the stationary contact body.

[0013] Preferably, an insulating pad is fixedly connected to the bottom of the permanent magnet, and the insulating pad is in close contact with the insulating shell to enhance the insulation effect and prevent leakage.

[0014] In summary, the technical effects and advantages of this utility model are as follows: This magnetic static contact achieves circuit conduction through the combined use of a magnetic base and a permanent magnet. Furthermore, the electromagnetic coil further increases the attraction force on the moving contact, synergistically providing magnetic field force to ensure stable contact resistance, improve vibration and shock resistance, and is suitable for complex working conditions.

[0015] By using the insulating shell and filling tank together, insulating materials can be poured in to further enhance the insulation performance. The shielding sheet blocks stray magnetic fields and reduces electromagnetic interference to surrounding equipment. The insulating pad further strengthens the insulation effect, prevents leakage, and improves safety. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0017] Figure 2 This is a schematic diagram of the insulating shell and related structures of this utility model;

[0018] Figure 3 This is a schematic diagram of the electromagnetic coil and related structures of this utility model;

[0019] Figure 4 This is a schematic diagram of the magnetic conductive base and related structures of this utility model.

[0020] In the figure: 1. Stationary contact body; 2. Contact point; 3. Insulating shell; 4. Magnetic base; 5. Permanent magnet; 6. Electromagnetic coil; 7. Heat sink; 8. Heat dissipation groove; 9. Filling groove; 10. Shielding sheet; 11. First fixing hole; 12. Second fixing hole; 13. Insulating pad. Detailed Implementation

[0021] This utility model provides a magnetically attracted stationary contact. To make the purpose, technical solution, and effects of this utility model clearer and more explicit, the following describes this utility model in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit the scope of protection of this utility model.

[0022] Reference Figure 1-4 A magnetically attached stationary contact includes a stationary contact body 1, contacts 2, and an insulating shell 3 encasing the stationary contact body 1. The stationary contact body 1 is made of a high-conductivity copper alloy with a finely machined surface to ensure a smooth and flat surface. The contacts 2 are located on the stationary contact body 1 and are made of a wear-resistant, low-resistance silver alloy material. They are fixed to the front end of the stationary contact body 1 by welding or pressing to ensure good electrical contact performance. The insulating shell 3 is made of high-performance insulating materials such as epoxy resin. A magnetically conductive base 4 is fixedly connected to the bottom of the stationary contact body 1. The magnetically conductive base 4 is made of stacked high-permeability silicon steel sheets. A permanent magnet 5 is fixed inside the magnetically conductive base 4. The permanent magnet 5 is made of neodymium iron boron permanent magnet material (with high remanence and high coercivity characteristics) and is embedded in the magnetically conductive base after precision machining. Inside the magnetic base 4, an electromagnetic coil 6 is fixedly connected to the outer wall of the magnetic base 4, and the electromagnetic coil 6 is wound on the magnetic base 4. The magnetic base 4, permanent magnet 5 and electromagnetic coil 6 are all located inside the insulating shell 3. The permanent magnet 5 is embedded inside the magnetic base 4 and uses high remanence materials such as neodymium iron boron to continuously generate a stable magnetic field. The magnetic base 4 is made of silicon steel with high magnetic permeability, which can concentrate and enhance the magnetic field of the permanent magnet 5, so that its magnetic lines of force mainly converge towards the contact point 2 at the front end of the stationary contact body 1. The moving contact needs to be made of magnetic material. For example, when electrical pure iron is close to the stationary contact, it is magnetized under the action of the magnetic field of the permanent magnet 5 and forms a magnetic coupling with the contact point 2 of the stationary contact. The magnetic force overcomes the initial displacement resistance of the moving contact and attracts it to the surface of the contact point 2 to achieve tight electrical contact and conduct the circuit.

[0023] Reference Figure 2 A heat sink 7 is fixedly provided on the outer wall of the stationary contact body 1. The heat sink 7 is made of aluminum alloy and is fixedly connected to the insulating shell 3. A heat dissipation groove 8 is provided on the heat sink 7. The heat sink 7 and the heat dissipation groove 8 facilitate the heat dissipation of the stationary contact body 1.

[0024] Reference Figure 1 The insulating shell 3 is provided with a filling groove 9, which can be filled with insulating material to further enhance the insulation performance.

[0025] Reference Figure 2 The insulating shell 3 has a shielding sheet 10 fixed inside, which effectively blocks stray magnetic fields and reduces electromagnetic interference to surrounding equipment.

[0026] Reference Figure 1-2One end of the stationary contact body 1 is provided with a second fixing hole 12, and the other end of the stationary contact body 1 is provided with a first fixing hole 11. The first fixing hole 11 and the second fixing hole 12 facilitate the stable installation of the stationary contact in the equipment by means of bolts or other connecting parts, so as to meet the needs of different installation scenarios.

[0027] Reference Figure 2 and Figure 4 An insulating pad 13 is fixedly connected to the bottom of the permanent magnet 5. The insulating pad 13 is in close contact with the insulating shell 3 and is located between the insulating shell 3 and the permanent magnet 5 to enhance the insulation effect and prevent leakage.

[0028] Working principle: When the magnetic material of the moving contact is made close to the magnetically attracted stationary contact, the magnetic field generated by the permanent magnet 5 is conducted and enhanced through the magnetic base 4, attracting the moving contact to the contact point 2 of the stationary contact body 1, forming a tight electrical contact and realizing circuit conduction. When it is necessary to enhance contact stability, such as in a high current or vibration environment, the electromagnetic coil 6 is energized, and the magnetic field generated by it is superimposed with the magnetic field of the permanent magnet 5, further increasing the attraction force on the moving contact. When disconnecting, the electromagnetic coil 6 is de-energized, the magnetic field strength weakens, and the moving contact separates from the stationary contact under external force such as spring force, completing the circuit disconnection.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0030] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A magnetically attracted stationary contact, characterized in that, The device includes a stationary contact body (1), a contact (2), and an insulating shell (3) wrapped around the stationary contact body (1). The contact (2) is located on the stationary contact body (1). A magnetic base (4) is fixedly connected to the bottom of the stationary contact body (1). A permanent magnet (5) is fixedly installed inside the magnetic base (4). An electromagnetic coil (6) is fixedly connected to the outer wall of the magnetic base (4), and the electromagnetic coil (6) is wound around the magnetic base (4). The magnetic base (4), the permanent magnet (5), and the electromagnetic coil (6) are all located inside the insulating shell (3).

2. A magnetically attracted stationary contact according to claim 1, characterized in that, The outer wall of the stationary contact body (1) is fixedly provided with a heat sink (7), the heat sink (7) is fixedly connected to the insulating shell (3), and a heat sink groove (8) is provided on the heat sink (7).

3. A magnetically attracted stationary contact according to claim 1, characterized in that, The insulating shell (3) is provided with a filling groove (9).

4. A magnetically attracted stationary contact according to claim 1, characterized in that, The insulating shell (3) is fixedly provided with a shielding sheet (10).

5. A magnetically attracted stationary contact according to claim 1, characterized in that, The stationary contact body (1) has a second fixing hole (12) at one end and a first fixing hole (11) at the other end.

6. A magnetically attracted stationary contact according to claim 1, characterized in that, An insulating pad (13) is fixedly connected to the bottom of the permanent magnet (5), and the insulating pad (13) is in close contact with the insulating shell (3).

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