Bistable permanent magnetic mechanism opening buffer device
By introducing a buffer device into the bistable permanent magnet mechanism and utilizing the combination of springs and magnetic materials, the problem of large tripping impact is solved, and the mechanical life of the circuit breaker is improved.
Patent Information
- Application Number
- CN202422594587.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-25
- Publication Date
- 2025-11-07
- Estimated Expiration
- 2034-10-25
AI Technical Summary
Bistable permanent magnet circuit breakers experience large impact forces during tripping, which limits further improvements in their mechanical lifespan.
A buffer device is introduced into the bistable permanent magnet mechanism, including a moving iron core, a permanent magnet, upper and lower yokes, a magnetic ring and a spring. When the moving iron core is driven to move by the energized trip coil, the spring and the magnetic material work together to generate a counterforce to prevent the moving iron core from falling rapidly and reduce the movement speed at the trip end.
It effectively reduces the mechanical impact force on each component during tripping and improves the mechanical life of the bistable permanent magnet circuit breaker.
Smart Images
Figure CN223527108U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of power switch equipment circuit breaker, and particularly relates to a bistable permanent magnetic mechanism opening buffer device for driving the operation of a circuit breaker. BACKGROUND
[0002] With the continuous innovation of the power switch equipment circuit breaker technology, the bistable permanent magnetic mechanism, as the core component for driving the opening and closing of the circuit breaker, is increasingly widely applied in the field of circuit breakers due to its high reliability, simple structure and long mechanical life. However, the bistable permanent magnetic mechanism also has its shortcomings, i.e., the opening speed of the circuit breaker driven by the bistable permanent magnetic mechanism is getting faster and faster, which results in relatively intense collision between the mechanical transmission components of the circuit breaker at the end of the opening, and is not conducive to the mechanical life of the vacuum bulb and other transmission components of the circuit breaker. In order to further improve the overall mechanical life of the bistable permanent magnetic mechanism circuit breaker, a buffer device is arranged at the end of the opening of the bistable permanent magnetic mechanism, which can more effectively reduce the mechanical impact force of the components during the opening, thereby improving the mechanical life of the bistable permanent magnetic mechanism circuit breaker.
[0003] The buffer device has the characteristics of small size, simple structure, long life and low cost compared with the traditional oil buffer device, and has a better application prospect on the bistable permanent magnetic mechanism. CONTENT OF THE UTILITY MODEL
[0004] (I) Technical problem to be solved
[0005] The utility model provides a bistable permanent magnetic mechanism opening buffer device to solve the problem that the current bistable permanent magnetic mechanism circuit breaker has a large opening impact, thereby limiting the further improvement of the mechanical life of the bistable permanent magnetic mechanism circuit breaker.
[0006] (II) Technical scheme
[0007] In order to solve the above problems, the utility model provides a kind of bistable permanent magnetic mechanism opening buffer device, including moving iron core, permanent magnet, lower yoke, upper yoke and magnetic conductive ring, the permanent magnet upper portion is wound with closing coil, lower portion is wound with opening coil, the magnetic conductive ring is covered on the permanent magnet, the upper yoke is connected with the upper portion of the permanent magnet, the lower yoke is connected with the lower portion of the permanent magnet, the moving iron core moves back and forth between the upper yoke and the lower yoke, the lower yoke middle part is equipped with recess, the pressing block and the spring are sequentially arranged in the recess from top to bottom, when the opening coil energization drives the moving iron core to move down a stroke a, start to contact the pressing block, while compressing the spring to carry out stroke b section, at this time, the spring generates upward counterforce to prevent the moving iron core from moving downward, to achieve the purpose of decelerating the moving iron core.
[0008] Preferably, the pressing block is made of magnetic conductive material.
[0009] Preferably, the spring is composed of a plurality of disc spring pieces.
[0010] (III) Technical effects
[0011] The lower yoke iron of the bistable permanent magnet mechanism is provided with a pressing block, and the pressing block is provided with a spring. When the opening coil is energized to drive the moving iron core to move downward by a stroke, the moving iron core starts to contact the pressing block, and the pressing block starts to compress the spring. The spring generates an upward counterforce to prevent the moving iron core from moving downward. Meanwhile, the pressing block is made of magnetic conductive material. When the opening coil is energized to drive the moving iron core to move downward until the moving iron core starts to contact the pressing block, a part of the magnetic flux generated by the opening coil and the permanent magnet directly flows from one side of the magnetic pole to the other side through the pressing block, and this part of the magnetic flux does not generate driving force for the moving iron core, so that the moving speed of the moving iron core in this stroke can be reduced. BRIEF DESCRIPTION OF DRAWINGS
[0012] In order to more clearly illustrate the technical solutions of the present application, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.
[0013] Figure 1 The bistable permanent magnet mechanism opening buffer device provided by the embodiment of the present application is shown in the opening initial state diagram.
[0014] Figure 2 The bistable permanent magnet mechanism opening buffer device provided by the embodiment of the present application is shown in the opening final segment state diagram.
[0015] Figure 3 The bistable permanent magnet mechanism opening buffer device provided by the embodiment of the present application is shown in the opening completion state diagram.
[0016] Figure 4 The spring structure diagram provided by the embodiment of the present application is shown in the opening completion state diagram.
[0017] Explanation of reference signs:
[0018] 1-moving iron core, 2-pressing block, 3-spring, 4-permanent magnet, 5-lower yoke iron, 6-upper yoke iron, 7-closing coil, 8-magnetic conductive ring, 9-opening coil. Implementation
[0019] In order for those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described in the present application in conjunction with the accompanying drawings of the embodiments of the present application; obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the protection scope of the present application.
[0020] Embodiment:
[0021] Reference is made to the accompanying drawings Figures 1 to 3 , the accompanying Figure 1 The initial opening state diagram of the double-stable permanent magnetic mechanism opening buffer device provided by the embodiments of the present application is shown in the figure, Figure 2 The final segment state diagram of the double-stable permanent magnetic mechanism opening buffer device provided by the embodiments of the present application is shown in the figure, Figure 3 The opening completion state diagram of the double-stable permanent magnetic mechanism opening buffer device provided by the embodiments of the present application is shown in the figure, which includes a moving iron core 1, a permanent magnet 4, a lower yoke iron 5, an upper yoke iron 6 and a magnetic conducting ring 8. The upper part of the permanent magnet 4 is wound with a closing coil 7, and the lower part is wound with an opening coil 9. The magnetic conducting ring 8 is sleeved on the permanent magnet 4. The upper yoke iron 6 is connected with the upper part of the permanent magnet 4, and the lower yoke iron 5 is connected with the lower part of the permanent magnet. A recess is arranged in the middle of the lower yoke iron 5. A pressing block 2 and a spring 3 are sequentially arranged in the recess from top to bottom. When the moving iron core 1 is driven to move downward by the opening coil 9 for a stroke a, the pressing block 2 starts to contact the spring 3. The spring 3 is compressed under the pressure of the moving iron core 1, and the spring 3 generates an upward counterforce to prevent the moving iron core 1 from moving downward.
[0022] The pressing block 2 is made of magnetic conducting material. When the moving iron core 1 is driven to move downward by the opening coil 9 to start contacting the pressing block 2, part of the magnetic flux W1 generated by the opening coil 9 and the permanent magnet 4 is short-circuited by the pressing block 2 from one magnetic pole to the other magnetic pole. This part of the magnetic flux does not generate a driving force for the moving iron core 1 to move downward. At the same time, the spring 3 generates an upward counterforce to prevent the moving iron core 1 from moving downward, thereby reducing the moving speed of the moving iron core 1 during the stroke b.
[0023] When the moving iron core 1 is driven to move downward by the opening coil 9 to contact the lower yoke iron 5 and complete the opening, the opening coil 9 is de-energized. The moving iron core 1 is attracted and kept at the opening position by the magnetic flux W2 generated by the permanent magnet 4.
[0024] As Figure 4 The spring structure diagram provided by the embodiments of the present application is shown in the figure. The spring 3 is a disc spring group, which is composed of a plurality of disc spring pieces combined into a disc spring group. Compared with a spiral spring, the disc spring group has better mechanical properties matched with the double-stable permanent magnetic mechanism.
[0025] The moving iron core (1) moves back and forth between the upper yoke (6) and the lower yoke (5), characterized in that a groove is arranged in the middle of the lower yoke, the pressing block and the spring are arranged in the groove in sequence from top to bottom, when the opening coil is energized to drive the moving iron core to move downward by a stroke a, the moving iron core starts to contact the pressing block and compresses the spring by a stroke b, at this time the spring generates an upward counterforce to prevent the moving iron core from moving downward, achieving the purpose of decelerating the moving iron core
[0026] It should be noted that the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the application is used, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.
[0027] It should also be noted that unless otherwise explicitly specified and limited, the terms "provided with", "opened with" and the like should be broadly understood, and for those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.
Claims
1. A bi-stable permanent magnetic mechanism opening and closing buffer device, characterized in that, The device comprises a moving iron core, a permanent magnet, a lower yoke iron, an upper yoke iron and a magnetic conducting ring, the upper part of the permanent magnet is wound with a closing coil, the lower part of the permanent magnet is wound with an opening coil, the magnetic conducting ring is sleeved on the permanent magnet, the upper yoke iron is connected with the upper part of the permanent magnet, the lower yoke iron is connected with the lower part of the permanent magnet, the moving iron core moves back and forth between the upper yoke iron and the lower yoke iron, the middle part of the lower yoke iron is provided with a recess, a pressing block and a spring are sequentially arranged in the recess from top to bottom, when the opening coil is energized to drive the moving iron core to move downward by a stroke a, the moving iron core starts to contact the pressing block and compresses the spring by a stroke b, at this time, the spring generates an upward counterforce to prevent the moving iron core from moving downward, so that the moving iron core is decelerated.
2. The double-stable permanent magnetic mechanism opening and closing buffer device according to claim 1, characterized in that, The pressing block is made of magnetic conducting material.
3. A bi-stable permanent magnet mechanism opening and closing buffer device according to claim 1 or 2, characterized in that, The spring is composed of a plurality of disc spring pieces.