Electromagnetic mechanism of vacuum contactor
By using non-magnetic tripping springs and auxiliary springs in the electromagnetic mechanism of the vacuum contactor, combined with the design of slide rails and rotating guide blocks, the material fatigue problem caused by spring magnetization is solved, and the stable reset of the moving iron core and the safe tripping of the contactor are achieved.
Patent Information
- Application Number
- CN202422281971.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-19
- Publication Date
- 2025-11-04
- Estimated Expiration
- 2034-09-19
AI Technical Summary
In the electromagnetic mechanism of traditional vacuum contactors, the spring is easily magnetized due to its proximity to the coil, which accelerates material fatigue and affects the normal opening and closing of the contacts.
Both the trip spring and the auxiliary spring are made of non-magnetic materials, and the design of the slide rail and rotating guide block ensures that the spring is not affected by magnetization. The auxiliary spring serves as a backup system to provide a stable reset force.
It improves the reliability of moving iron core reset, ensures stable contactor tripping, avoids spring performance degradation and material fatigue caused by magnetization, and enhances safety in use.
Smart Images
Figure CN223513863U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of vacuum contactor technology, specifically to an electromagnetic mechanism for a vacuum contactor. Background Technology
[0002] A vacuum contactor is an electrical switching device used to control high-voltage circuits. It uses vacuum as an insulating and arc-extinguishing medium. Compared with traditional contactors, the vacuum environment provides extremely high insulation performance, enabling the vacuum contactor to operate safely under high-voltage conditions. The electromagnetic mechanism is a key part of the vacuum contactor, responsible for controlling the opening and closing of the contactor.
[0003] When the contact reset in the electromagnetic mechanism of a vacuum contactor is achieved through a spring without effective protection, it may affect the reset effect of the moving iron core contacts. In existing vacuum contactor electromagnetic mechanisms, springs are typically used to pull the moving iron core back to its initial position when the power is off, ensuring that the contacts open. However, traditional springs are usually set separately and located close to the coil, which can easily lead to magnetization, causing accelerated fatigue of the spring material, resulting in contact adhesion and affecting the normal opening and closing of the contacts. Therefore, a vacuum contactor electromagnetic mechanism is proposed to solve the above problems. Utility Model Content
[0004] To address the shortcomings of existing technologies, this utility model provides an electromagnetic mechanism for a vacuum contactor, which has advantages such as good spring reset protection. It solves the problem that traditional springs are usually set separately and located close to the coil, which can easily lead to magnetization, accelerated fatigue of the spring material, contact adhesion, and affect the normal opening and closing of the contacts.
[0005] To achieve the above objectives, this utility model provides the following technical solution: an electromagnetic mechanism for a vacuum contactor, comprising an electromagnetic component disposed inside the contactor body;
[0006] The electromagnetic assembly includes a rotating shaft and a split plate. The rotating shaft is located inside the contactor body, and the split plate is rotatably located outside the rotating shaft. A moving iron core is located on the right side of the split plate. A fixed iron core corresponding to the position of the moving iron core is located inside the contactor body, and a coil is located on the outside of the fixed iron core to generate a magnetic field to attract the moving iron core to move and engage with the fixed iron core. An insulating block is located above the right side of the split plate, and a tripping spring is horizontally fixed between the insulating block and the side opposite to the inner wall of the contactor body to pull the moving iron core back to its initial position.
[0007] The electromagnetic component also includes two auxiliary springs disposed on the right side of the insulating block, and the two auxiliary springs are respectively disposed on the front and rear sides of the opening spring to assist the opening spring in pulling the moving iron core to reset. The inner walls of the front and rear sides of the contactor body are provided with slide rails, and the front and rear sides of the insulating block are provided with rotating grooves. Rotating guide blocks are rotatably disposed inside the two rotating grooves, and the two rotating guide blocks are respectively slidably disposed on the outside of the two slide rails to guide the opening and closing plates to slide stably.
[0008] Furthermore, the trip spring and the two auxiliary springs are all non-magnetic springs to protect the springs from the magnetization of the coils.
[0009] Furthermore, the slide rail is arc-shaped, and the arc is equal to the rotation arc of the separating plate around the axis, in order to maintain the stability of the separating plate's movement.
[0010] Furthermore, the ends of the two auxiliary springs furthest from the insulating block are connected to the interior of the contactor body as a backup system to ensure the contactor can open normally.
[0011] Furthermore, the cross-sectional shape of the rotating guide block is T-shaped to allow for flexible adjustment of the angle when sliding along the outside of the slide rail and to prevent it from falling out of the rotating groove.
[0012] Compared with the prior art, the technical solution of this application has the following beneficial effects:
[0013] The electromagnetic mechanism of this vacuum contactor enhances the reset force of the trip spring by adding an auxiliary spring, thereby improving the reliability of the moving iron core reset and ensuring stable tripping of the contactor. The auxiliary spring helps to provide more uniform force during tripping, reducing the problem of unstable reset of the moving iron core caused by uneven spring force. At the same time, both the trip spring and the auxiliary spring are made of non-magnetic materials, avoiding the performance degradation and material fatigue caused by magnetization of traditional springs. Furthermore, the auxiliary spring serves as a backup system, ensuring normal tripping of the contactor even if the main trip spring fails, thus improving operational safety. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the structure of this utility model;
[0015] Figure 2 This is a schematic diagram of the electromagnetic component of this utility model;
[0016] Figure 3 This is a partial top view of the electromagnetic component of this utility model.
[0017] In the diagram: 1. Contactor body; 2. Electromagnetic assembly; 21. Rotating shaft; 22. Separating plate; 23. Moving iron core; 24. Fixed iron core; 25. Coil; 26. Insulating block; 27. Opening spring; 28. Auxiliary spring; 29. Slide rail; 210. Rotating guide block. Detailed Implementation
[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0019] Example 1: Please refer to Figures 1 to 2 The electromagnetic mechanism of a vacuum contactor in this embodiment includes an electromagnetic component 2 disposed inside the contactor body 1.
[0020] Example 2: Please refer to Figures 1 to 2 Based on Embodiment 1, the electromagnetic component 2 in this embodiment includes a rotating shaft 21 and a separating plate 22. The rotating shaft 21 is disposed inside the contactor body 1, and the separating plate 22 is rotatably disposed outside the rotating shaft 21. A moving iron core 23 is disposed on the right side of the separating plate 22. A fixed iron core 24 corresponding to the position of the moving iron core 23 is disposed inside the contactor body 1, and a coil 25 is disposed on the outside of the fixed iron core 24 to generate a magnetic field to attract the moving iron core 23 to move and engage with the fixed iron core 24. When closing is required, the circuit is connected to the coil 25 to prepare for energization. After the coil 25 is energized, it generates a magnetic field, which attracts the moving iron core 23 towards the fixed iron core. 24. The moving iron core 23 moves to the fixed iron core 24 and engages with it, completing the contact closure action and connecting the circuit. The coil 25 is continuously energized to maintain the magnetic field, ensuring that the moving iron core 23 and the fixed iron core 24 remain engaged, maintaining the circuit connection. The vacuum contactor electromagnetic mechanism is in the initial state. The moving iron core 23 is located in the initial position under the action of the opening spring 27 and the auxiliary spring 28, and the contacts are in the open state. An insulating block 26 is provided above the right side of the separating plate 22. An opening spring 27 is horizontally fixed between the insulating block 26 and the side opposite to the inner wall of the contactor body 1 to pull the moving iron core 23 back to the initial position.
[0021] It should be noted that when the circuit breaker needs to be tripped, the power supply to the coil 25 is cut off, causing the magnetic field to disappear. After the magnetic field disappears, the tripping spring 27 and the auxiliary spring 28 work together to pull the moving iron core 23 back to its initial position. As the moving iron core 23 is reset, the contacts are opened, the circuit is cut off, and the tripping operation is completed.
[0022] The electromagnetic component 2 also includes two auxiliary springs 28 disposed on the right side of the insulating block 26, and the two auxiliary springs 28 are respectively disposed on the front and rear sides of the opening spring 27 to assist the opening spring 27 in pulling the moving iron core 23 to reset. The inner walls of the front and rear sides of the contactor body 1 are provided with slide rails 29, and the front and rear sides of the insulating block 26 are provided with rotating grooves. Rotating guide blocks 210 are rotatably disposed inside the two rotating grooves, and the two rotating guide blocks 210 are respectively slidably disposed on the outside of the two slide rails 29 to guide the opening and closing plate 22 to slide stably.
[0023] In this embodiment, the trip spring 27 and the two auxiliary springs 28 are all non-magnetic springs to prevent the springs from being magnetized by the coil 25. The trip spring 27 and the auxiliary springs 28 are made of non-magnetic materials to avoid magnetization by the magnetic field generated by the coil 25, reduce spring material fatigue, and prevent contact adhesion. The slide rail 29 is arc-shaped, and the arc is equal to the rotation arc of the split plate 22 around the rotating shaft 21 to maintain the stability of the movement of the split plate 22. During the reset process of the moving iron core 23, the rotation guide block 210 of the split plate 22 slides along the slide rail 29 to ensure that the split plate 22 slides stably to the initial position.
[0024] In this embodiment, the ends of the two auxiliary springs 28 away from the insulating block 26 are connected to the interior of the contactor body 1 as a backup system to ensure that the contactor opens normally. The cross-sectional shape of the rotating guide block 210 is T-shaped to flexibly adjust the angle when sliding along the outside of the slide rail 29 and to prevent it from falling out of the rotating groove.
[0025] It should be noted that if the main tripping spring 27 fails, the auxiliary spring 28 continues to work as a backup system to ensure that the moving iron core 23 can be reset. After the tripping is completed, the vacuum contactor electromagnetic mechanism is in a stopped state, waiting for the next closing command. When preparing to close the circuit again under stable and safe conditions, the operator will repeat the above process and start the operation from the preparation for closing.
[0026] The working principle of the above embodiments is as follows:
[0027] When the vacuum contactor's electromagnetic mechanism is in its initial state, the moving iron core 23 is positioned in its initial position under the action of the opening spring 27 and the auxiliary spring 28, and the contacts are in the open state. When closing is required, the circuit is connected to the coil 25, ready to be energized. After the coil 25 is energized, a magnetic field is generated, which attracts the moving iron core 23 to move towards the fixed iron core 24. The moving iron core 23 moves to the fixed iron core 24 and is attracted to it, completing the contact closing action and connecting the circuit. The coil 25 is continuously energized to maintain the magnetic field, ensuring that the moving iron core 23 and the fixed iron core 24 remain in the attracted state, maintaining the circuit connection. When opening is required, the power supply to the coil 25 is cut off, causing the magnetic field to disappear. After the magnetic field disappears, the opening spring 27 and the auxiliary spring 28 work together to pull the moving iron core 23 back to its initial position. As the moving iron core 23 resets, the contacts open, the circuit is cut off, and the opening operation is completed.
[0028] During the reset process of the moving iron core 23, the rotating guide block 210 of the split plate 22 slides along the slide rail 29 to ensure that the split plate 22 slides stably to the initial position. The opening spring 27 and the auxiliary spring 28 are made of non-magnetic materials to avoid magnetization due to the magnetic field generated by the coil 25, reduce spring material fatigue, and prevent contact adhesion. If the main opening spring 27 fails, the auxiliary spring 28 continues to work as a backup system to ensure that the moving iron core 23 can be reset. After the opening is completed, the vacuum contactor electromagnetic mechanism is in a stopped state, waiting for the next closing command. When preparing to close the circuit again under stable and safe conditions, the operator will repeat the above process and start the operation from the preparation for closing.
[0029] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0030] If this patent discloses or relates to components or structural parts that are fixedly connected to each other, then unless otherwise stated, a fixed connection can be understood as: a fixed connection that can be detached (e.g., using bolts or screws), or a fixed connection that cannot be detached (e.g., riveting, welding). Of course, a fixed connection can also be replaced by an integral structure (e.g., manufactured by casting) (except where it is obviously impossible to use an integral forming process).
[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.
Claims
1. An electromagnetic mechanism for a vacuum contactor, characterized in that: Including an electromagnetic component (2) disposed inside the contactor body (1); The electromagnetic component (2) includes a rotating shaft (21) and a split plate (22). The rotating shaft (21) is located inside the contactor body (1). The split plate (22) is rotatably located outside the rotating shaft (21). A moving iron core (23) is provided on the right side of the split plate (22). A fixed iron core (24) corresponding to the position of the moving iron core (23) is provided inside the contactor body (1). A coil (25) is provided on the outside of the fixed iron core (24) to generate a magnetic field to attract the moving iron core (23) to move and engage with the fixed iron core (24). An insulating block (26) is provided above the right side of the split plate (22). A tripping spring (27) is horizontally fixed between the insulating block (26) and the side opposite to the inner wall of the contactor body (1) to pull the moving iron core (23) back to its initial position. The electromagnetic component (2) also includes two auxiliary springs (28) disposed on the right side of the insulating block (26), and the two auxiliary springs (28) are disposed on the front and rear sides of the opening spring (27) to assist the opening spring (27) in pulling the moving iron core (23) to reset. The inner walls of the front and rear sides of the contactor body (1) are provided with slide rails (29), and the front and rear sides of the insulating block (26) are provided with rotating grooves. Rotating guide blocks (210) are rotatably disposed inside the two rotating grooves, and the two rotating guide blocks (210) are slidably disposed on the outside of the two slide rails (29) to guide the opening and closing plate (22) to slide stably.
2. The electromagnetic mechanism of a vacuum contactor according to claim 1, characterized in that: The trip spring (27) and the two auxiliary springs (28) are all non-magnetic springs, used to protect the springs from the magnetization of the coil (25).
3. The electromagnetic mechanism of a vacuum contactor according to claim 1, characterized in that: The slide rail (29) is arc-shaped, and the arc is equal to the rotation arc of the split plate (22) around the axis (21) to maintain the stability of the movement of the split plate (22).
4. The electromagnetic mechanism of a vacuum contactor according to claim 1, characterized in that: The two auxiliary springs (28) are connected at the ends away from the insulating block (26) to the inside of the contactor body (1) as a backup system to ensure that the contactor can open normally.
5. The electromagnetic mechanism of a vacuum contactor according to claim 1, characterized in that: The rotating guide block (210) has a T-shaped cross-section to allow for flexible adjustment of the angle when sliding along the outside of the slide rail (29) and to prevent it from falling out of the rotating groove.