Static contact assembly

Abstract

The utility model relates to a static contact subassembly, relates to static contact technical field, including insulation shield, arc extinguishing subassembly, contact subassembly and torsion spring subassembly, torsion spring subassembly is provided on the insulation shield, contact subassembly is provided on torsion spring subassembly, arc extinguishing subassembly includes run-on plate, reflection support, reflection plate, reflection rotation shaft and arc extinguishing chamber, and the arc extinguishing chamber is provided with the reflection support, the reflection plate, reflection rotation shaft and arc extinguishing chamber. The arc extinguishing assembly is arranged on the contact assembly, the arc striking plate is arranged on the contact assembly, the reflection support is arranged on the arc striking plate, a through hole is formed in the reflection support, the reflection rotating shaft is arranged on the reflection support through the through hole, the reflection plate is rotationally arranged on the reflection rotating shaft, and the arc extinguishing chamber is arranged on the insulating protective cover. When the circuit is disconnected, the damage to the surfaces of the contacts and the damage to the surrounding environment caused by high-temperature electric arcs generated between the static contacts and the moving contacts are reduced, and meanwhile, an insulating shield is arranged, so that certain electric arc suppression and isolation effects can be performed on the contacts.

Description

Technical Field

[0001] This application relates to the field of stationary contact technology, and more particularly to a stationary contact assembly. Background Technology

[0002] The stationary contact assembly is a key component in electrical equipment, primarily used in switching devices such as circuit breakers, contactors, and relays. It typically works in conjunction with the moving contact to connect and disconnect the circuit. The stationary contact assembly is usually fixed to a part of the equipment, while the moving contact is movable. When the moving contact contacts the stationary contact, the circuit is closed, and current can flow; when the moving contact separates from the stationary contact, the circuit is open, and the current is interrupted.

[0003] Currently, a Chinese utility model patent application published on July 19, 2022, with publication number CN 217008953U, provides a static contact assembly, including a contact body. A connecting plate is fixedly mounted on the front of the contact body, and an arc-shaped plate is movably connected to the bottom of the connecting plate. A locking block is fixedly connected to one end of the arc-shaped plate. This utility model, through the design of the arc-shaped plate, directly presses it into an arc shape, facilitating direct locking installation via the locking block. It also boasts high strength. Furthermore, the high-temperature resistant coating ensures current conduction after energization, preventing short circuits due to excessive temperature, effectively improving safety performance. The arc-shaped plate facilitates disassembly, significantly increasing the speed of installation and disassembly, and making operation convenient. It also addresses the problems of low strength, poor safety performance, and inconvenient installation in current static contact assemblies, which lead to poor performance of the static contact mechanism.

[0004] In related technologies, stationary contact assemblies lack a protective casing. When the circuit is disconnected, a high-temperature arc may be generated between the stationary and moving contacts. This arc can damage the contact surface and may also harm the surrounding environment, such as causing a fire or injuring operators. A protective casing can provide arc suppression and isolation, reducing these risks.

[0005] Therefore, it is necessary to provide a static contact assembly to solve the above problems. Utility Model Content

[0006] This application provides a stationary contact assembly to improve the technical problem in related technologies where the lack of a protective cover on the outside of the stationary contact may lead to accidental injury when a high-temperature electric arc occurs.

[0007] This application provides a stationary contact assembly, including an insulating cover, an arc-extinguishing assembly, a contact assembly, and a torsion spring assembly. The torsion spring assembly is disposed on the insulating cover, and the contact assembly is disposed on the torsion spring assembly. The arc-extinguishing assembly includes an arc-initiating plate, a reflective bracket, a reflective plate, a reflective rotating shaft, and an arc-extinguishing chamber. The arc-initiating plate is disposed on the contact assembly, and the reflective bracket is disposed on the arc-initiating plate. The reflective bracket has a through hole, and the reflective rotating shaft is disposed on the reflective bracket through the through hole. The reflective plate is rotatably disposed on the reflective rotating shaft, and the arc-extinguishing chamber is disposed on the insulating cover.

[0008] The technical solutions described above in this application embodiment have at least the following technical effects: when the circuit is broken and an electric arc is generated between the stationary contact and the moving contact, the electric arc is connected to the reflector plate through the arc-initiating plate on the contact. The electric arc on the reflector plate is pulled into the arc-extinguishing chamber by the electromagnetic force. After the electric arc enters, it will be divided into multiple short arcs. When the alternating current crosses zero, all the short arcs will be extinguished. At the same time, the arc-extinguishing chamber will dissipate heat, and the electric arc will cool down quickly, thus achieving the effect of arc extinguishing.

[0009] The stationary contact assembly provided in this application can reduce the damage to the contact surface and the surrounding environment caused by the high-temperature electric arc generated between the stationary and moving contacts when the circuit is disconnected through the arc extinguishing component. At the same time, the insulating cover can provide a certain degree of arc suppression and isolation for the contacts.

[0010] In some embodiments, the arc-extinguishing chamber includes an arc-extinguishing grid and a grid support plate. The grid support plate is disposed on an insulating cover and has positioning holes. The arc-extinguishing grid is disposed on the grid support plate through the positioning holes.

[0011] In some embodiments, the torsion spring assembly includes a bottom wall, a bracket plate, a support wall, a positioning foot, and a torsion spring. A limiting hole is formed on the bottom wall, and the bottom wall is disposed on the insulating cover through the limiting hole. The bracket plate is disposed on the bottom wall, the support wall is disposed on the bracket plate, the positioning foot is disposed on the bracket plate, and the torsion spring passes through the positioning foot.

[0012] In some embodiments, a magnetic sheet is provided on the support plate.

[0013] In some embodiments, the contact assembly includes a bending limiting part, a first rotating shaft, and a stationary contact. A connecting hole is provided on the support wall, the first rotating shaft is disposed on the support wall through the connecting hole, the bending limiting part is rotatably disposed on the first rotating shaft, and the stationary contact is disposed on the bending limiting part.

[0014] In some embodiments, a connecting groove is provided on the bending limiting part, and a magnetizing block is provided through the connecting groove.

[0015] In some embodiments, one end of the torsion spring abuts against the bottom wall, and the other end of the torsion spring abuts against the magnetizing block. Attached Figure Description

[0016] Figure 1 A three-dimensional structural schematic diagram of the stationary contact assembly provided in an embodiment of this application;

[0017] Figure 2 This is an exploded view of the stationary contact assembly provided in an embodiment of this application;

[0018] Figure 3 A cross-sectional structural schematic diagram of the insulating cover provided in the embodiments of this application;

[0019] Among them, the reference numerals in the figures are:

[0020] 1. Insulating cover; 2. Arc extinguishing assembly; 21. Arc ignition plate; 22. Reflector bracket; 23. Reflector plate; 24. Reflector rotating shaft; 25. Arc extinguishing chamber; 251. Arc extinguishing grid plate; 252. Grid plate support plate; 3. Contact assembly; 31. Stationary contact; 32. Bending limit part; 33. First rotating shaft; 34. Magnetizing block; 4. Torsion spring assembly; 41. Bottom wall; 42. Limiting hole; 43. Bracket plate; 44. Support wall; 45. Connecting hole; 46. Magnetic sheet; 47. Positioning foot; 48. Torsion spring. Detailed Implementation

[0021] Based on this, in order to improve the technical problem in the related technology that the lack of a protective cover on the outside of the stationary contact may lead to accidental injury when a high-temperature electric arc is generated, the embodiments of this application provide the following solution.

[0022] Please refer to the following: Figures 1 to 3 This application provides a stationary contact assembly, which includes an insulating cover 1, an arc-extinguishing assembly 2, a contact assembly 3, and a torsion spring assembly 4. The torsion spring assembly 4 is disposed on the insulating cover 1, the contact assembly 3 is disposed on the torsion spring assembly 4, and the arc-extinguishing assembly 2 is disposed on the insulating cover 1.

[0023] In some embodiments, please refer to the following: Figures 2 to 3The torsion spring assembly 4 includes a bottom wall 41, a support plate 43, a supporting wall 44, a positioning foot 47, and a torsion spring 48. A limiting hole 42 is formed on the bottom wall 41, and the bottom wall 41 is mounted on the insulating cover 1 through the limiting hole 42. The support plate 43 is mounted on the bottom wall 41, the supporting wall 44 is mounted on the support plate 43, the positioning foot 47 is mounted on the support plate 43, and the torsion spring 48 passes through the positioning foot 47. A magnetic conductive sheet 46 is provided on the support plate 43. The contact assembly 3 includes a bending limiting device. The support wall 44 has a connecting hole 45, the first rotating shaft 33 is mounted on the support wall 44 through the connecting hole 45, the bending limiting part 32 is rotatably mounted on the first rotating shaft 33, the stationary contact 31 is mounted on the bending limiting part 32, the bending limiting part 32 has a connecting groove, and a magnetizing block 34 is mounted through the connecting groove. One end of the torsion spring 48 abuts against the bottom wall 41, and the other end of the torsion spring 48 abuts against the magnetizing block 34.

[0024] With this configuration, when the torsion spring 48 is used on the positioning foot 47 in the insulating cover 1, one end of the torsion spring 48 abuts against the magnetizing block 34, increasing the pressure between the contacts. As the pressure between the contacts increases, the actual contact area between the contact surfaces also increases accordingly. This helps to form more metal contact points, thereby reducing contact resistance. Lower contact resistance means higher current conduction efficiency, reducing energy loss and heat generation. Simultaneously, during equipment operation, vibration and impact may cause contact separation or poor contact. Increasing the pressure between the contacts can enhance the mechanical tightness between them, reducing poor contact caused by external vibration or impact. Increased pressure between the contact surfaces can break down the oxide layer and corrosion products on the contact surface, maintaining good metal contact. This is crucial for preventing contact resistance from increasing over time and maintaining the long-term stability of the equipment. Furthermore, the magnetizing block 34 is provided on the bending limiting part 32. The magnetizing block 34 can generate a magnetic field, which can affect the path of the electric arc. During circuit breaker or switch operation, the electric arc is driven away from the contacts by the magnetic field, thereby reducing contact erosion and damage. The magnetic field also helps the arc cool and extinguish more quickly because charged particles in the arc are subjected to the Lorentz force in the magnetic field, accelerating their movement and increasing heat exchange with the surrounding medium. The magnetic field generated by the magnetizing block 34 can increase the magnetic attraction between the stationary and moving contacts, thereby enhancing the contact force. This helps reduce contact resistance and improve current conduction efficiency. The magnetic field can provide additional stabilizing force, reducing contact jitter and vibration during operation, thereby improving contact stability. By controlling the arc and enhancing the contact force, the magnetizing block 34 helps reduce mechanical and electrical wear of the contacts, thereby extending the service life of the equipment. Due to reduced contact wear, the maintenance requirements of the equipment will also be reduced accordingly, lowering long-term operating costs. Electric arcs are a major safety hazard in electrical equipment, which can lead to equipment damage or even fire. The magnetizing block 34 can significantly reduce the hazards caused by electric arcs and improve the safety of the equipment by controlling the path and duration of the electric arc. By reducing contact resistance and enhancing contact force, the magnetizing block 34 helps to improve the current carrying capacity of the equipment, enabling it to handle larger currents without overheating.

[0025] In some embodiments, please refer to the following: Figures 1 to 3The arc-extinguishing assembly 2 includes an arc-initiating plate 21, a reflective bracket 22, a reflective plate 23, a reflective rotating shaft 24, and an arc-extinguishing chamber 25. The arc-extinguishing chamber 25 includes an arc-extinguishing grid 251 and a grid support plate 252. The arc-initiating plate 21 is mounted on the contact assembly 3, the reflective bracket 22 is mounted on the arc-initiating plate 21, and the reflective bracket 22 has a through hole. The reflective rotating shaft 24 is mounted on the reflective bracket 22 through the through hole, and the reflective plate 23 is rotatably mounted on the reflective rotating shaft 24. The grid support plate 252 is mounted on the insulating cover 1, and the grid support plate 252 has a positioning hole. The arc-extinguishing grid 251 is mounted on the grid support plate 252 through the positioning hole.

[0026] With this configuration, when the circuit is broken and an electric arc is generated between the stationary and moving contacts, the arc passes through the arc-initiating plate 21 on the contact and connects to the reflector plate 23. The arc on the reflector plate 23, under the influence of electromagnetic force, is drawn into the arc-extinguishing grid 251. There is a certain gap between each grid plate, and the arc, after entering, will segment into multiple short arcs. When the alternating current crosses zero, all short arcs will be extinguished. Simultaneously, the arc-extinguishing grid 251 will dissipate heat, and the arc will quickly cool down, achieving the arc-extinguishing effect. Electric arcs can generate extremely high temperatures and intense light radiation, causing serious harm to the human body. The arc-extinguishing chamber 25 can quickly extinguish electric arcs, reducing the risks posed by arcs to operators and the surrounding environment. Electric arcs can cause electrical fires; the arc-extinguishing chamber 25 reduces this risk by rapidly extinguishing the arc. Arcs can also damage contacts and other components of electrical equipment; the arc-extinguishing chamber 25 reduces this damage by controlling the arc, extending the equipment's lifespan. Reduced equipment damage caused by arcs lowers maintenance requirements, thereby reducing maintenance costs and downtime. The rapid arc extinguishing of the arc-extinguishing chamber 25 allows circuit breakers or switching equipment to reclose more quickly, shortening power outage time and improving power supply continuity. Effective arc extinguishing reduces malfunctions caused by arcs, improving the overall stability of the system. Electric arcs may produce harmful gases and particulate matter. The arc-extinguishing chamber 25 reduces the emission of these harmful substances by controlling the arc, making it more environmentally friendly. Although the arc-extinguishing chamber 25 increases the initial cost of the equipment, the improved safety and reliability it provides reduces long-term operating costs, including reduced equipment replacement, repair costs, and downtime losses.

[0027] The implementation principle of a stationary contact assembly in this application embodiment is as follows: When a torsion spring 48 is used on the positioning foot 47 in the insulating cover 1, one end of the torsion spring 48 abuts against the magnetizing block 34, increasing the pressure between the contacts and thus reducing the contact resistance. When the circuit is broken and an electric arc is generated between the stationary contact and the moving contact, the electric arc is connected to the reflector plate 23 through the arc-initiating plate 21 on the contact. The electric arc on the reflector plate 23 is pulled into the arc-extinguishing grid plate 251 by the electromagnetic force. There is a certain gap between each grid plate. After the electric arc enters, it will be divided into multiple short arcs. When the alternating current crosses zero, all short arcs will be extinguished. At the same time, the arc-extinguishing grid plate 251 will dissipate heat, and the electric arc will cool down quickly, thus achieving the effect of arc extinguishing.

[0028] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A stationary contact assembly, characterized in that: The device includes an insulating shield (1), an arc-extinguishing assembly (2), a contact assembly (3), and a torsion spring assembly (4). The torsion spring assembly (4) is mounted on the insulating shield (1), and the contact assembly (3) is mounted on the torsion spring assembly (4). The arc-extinguishing assembly (2) includes an arc-initiating plate (21), a reflector bracket (22), a reflector plate (23), a reflector rotating shaft (24), and an arc-extinguishing chamber (25). The arc-initiating plate (21) is mounted on the contact assembly (3), and the reflector bracket (22) is mounted on the arc-initiating plate (21). The reflector bracket (22) has a through hole, and the reflector rotating shaft (24) is mounted on the reflector bracket (22) through the through hole. The reflector plate (23) is rotatably mounted on the reflector rotating shaft (24), and the arc-extinguishing chamber (25) is mounted on the insulating shield (1).

2. A stationary contact assembly according to claim 1, characterized in that: The arc-extinguishing chamber (25) includes an arc-extinguishing grid plate (251) and a grid plate support plate (252). The grid plate support plate (252) is disposed on the insulating cover (1). The grid plate support plate (252) has a positioning hole. The arc-extinguishing grid plate (251) is disposed on the grid plate support plate (252) through the positioning hole.

3. A stationary contact assembly according to claim 2, characterized in that: The torsion spring assembly (4) includes a bottom wall (41), a bracket plate (43), a support wall (44), a positioning foot (47), and a torsion spring (48). A limiting hole (42) is provided on the bottom wall (41), and the bottom wall (41) is mounted on the insulating cover (1) through the limiting hole (42). The bracket plate (43) is mounted on the bottom wall (41), the support wall (44) is mounted on the bracket plate (43), the positioning foot (47) is mounted on the bracket plate (43), and the torsion spring (48) passes through the positioning foot (47).

4. A stationary contact assembly according to claim 3, characterized in that: A magnetic sheet (46) is provided on the support plate (43).

5. A stationary contact assembly according to claim 4, characterized in that: The contact assembly (3) includes a bending limiting part (32), a first rotating shaft (33) and a stationary contact (31). A connecting hole (45) is provided on the support wall (44). The first rotating shaft (33) is disposed on the support wall (44) through the connecting hole (45). The bending limiting part (32) is rotatably disposed on the first rotating shaft (33). The stationary contact (31) is disposed on the bending limiting part (32).

6. A stationary contact assembly according to claim 5, characterized in that: A connecting groove is provided on the bending limiting part (32), and a magnetizing block (34) is provided through the connecting groove.

7. A stationary contact assembly according to claim 6, characterized in that: One end of the torsion spring (48) abuts against the bottom wall (41), and the other end of the torsion spring (48) abuts against the magnetizing block (34).

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