A new circuit breaker static contact structure
Patent Information
- Application Number
- CN202522194010.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-16
- Publication Date
- 2026-10-30
- Estimated Expiration
- 2035-10-16
AI Technical Summary
传统的断路器静触头结构在应对大电流和高负荷时，可能会出现发热严重、触头磨损加剧等问题
[0011]1.一体成型的固定部、过渡部以及接触部结构，消除了部件间连接产生的额外接触电阻，使得电流在静触头内的传导更加顺畅，降低了电能在传导过程中的损耗。在断路器频繁分合闸的过程中，静触头能够承受较大的机械应力而不发生结构损坏。过渡部的两个连接件起到缓冲和过渡作用，在分合闸瞬间吸收和分散冲击力，减少了对固定部和接触部的直接损伤。这使得静触头在长期使用过程中保持良好的机械性能，降低了因结构松动或损坏导致的故障发生率，提高了断路器的可靠性和耐用性。固定部上对称的两个螺纹孔方便了静触头的安装，螺纹连接方式简单可靠，便于快速将静触头固定在断路器的相应位置。而固定部另一侧的通孔，既增加了散热面积，有助于降低触头温度，又可作为布线通道，方便内部电路的连接和布置。在断路器分合闸产生电弧时，引弧块将电弧引导至自身，避免电弧直接侵蚀接触部的主要接触面。
Smart Images
Figure CN224922692U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of circuit breaker technology, and more specifically, to a novel static contact structure for circuit breakers. Background Technology
[0002] With rapid economic development, electricity demand continues to rise, power grid capacity is constantly increasing, and the number and power of electrical equipment at the user end are also increasing. This requires circuit breakers to be able to carry larger currents and have higher opening and closing capabilities to ensure safe and reliable circuit interruption under high current conditions. Traditional circuit breaker static contact structures may experience severe overheating and accelerated contact wear when dealing with large currents and high loads. Utility Model Content
[0003] To address the shortcomings of existing technologies, the purpose of this invention is to provide a novel circuit breaker stationary contact structure with high structural strength and convenient connection.
[0004] To achieve the above objectives, this utility model provides the following technical solution: a novel circuit breaker stationary contact structure, comprising a stationary contact body, the stationary contact body comprising a fixing part, a transition part, and a contact part, the fixing part, the transition part, and the contact part being an integrally formed structure, the transition part comprising two connecting members disposed between the fixing part and the contact part, the fixing part having two threaded holes symmetrically provided on one side near the transition part, and a through hole provided on the other side, the contact part having an arc-starting block.
[0005] The present invention is further configured such that the central axis of the through hole is located on the axis of symmetry of the two threaded holes.
[0006] The present invention is further configured such that the fixing part and the contact part are arranged in parallel.
[0007] The present invention is further configured such that the included angle between the fixing part and the transition part is 90°-120°.
[0008] The present invention is further provided with a plurality of evenly distributed anti-slip holes on the fixing part.
[0009] The present invention is further configured such that the width of the arc-initiating block is 1 / 3 to 1 / 2 of the width of the stationary contact body.
[0010] The beneficial effects of this utility model are:
[0011] 1. The integrated structure of the fixed part, transition part, and contact part eliminates the additional contact resistance caused by the connection between components, making the current conduction within the stationary contact smoother and reducing energy loss during conduction. During frequent opening and closing of the circuit breaker, the stationary contact can withstand significant mechanical stress without structural damage. The two connecting parts of the transition part act as buffers and transition components, absorbing and dispersing the impact force at the moment of opening and closing, reducing direct damage to the fixed part and contact part. This allows the stationary contact to maintain good mechanical performance during long-term use, reducing the failure rate caused by structural loosening or damage, and improving the reliability and durability of the circuit breaker. The two symmetrical threaded holes on the fixed part facilitate the installation of the stationary contact; the threaded connection is simple and reliable, allowing for quick and easy fixing of the stationary contact to the corresponding position on the circuit breaker. The through hole on the other side of the fixed part increases the heat dissipation area, helping to reduce the contact temperature, and also serves as a wiring channel, facilitating the connection and layout of internal circuits. When an electric arc is generated during the opening and closing of the circuit breaker, the arc-initiating block guides the arc to itself, preventing the arc from directly eroding the main contact surface of the contact part.
[0012] 2. The central axis of the through hole is located on the axis of symmetry of the two threaded holes, further enhancing the symmetry of the fixing structure and ensuring more uniform stress distribution in all directions during installation. When the stationary contact is fixed to the corresponding position on the circuit breaker through the threaded holes, the symmetrical structure ensures a stable installation, preventing tilting or deformation due to uneven installation stress. During long-term operation of the circuit breaker, it better resists external vibrations and impacts, maintaining structural stability and thus ensuring the reliability of electrical connections and reducing faults such as poor contact caused by structural instability. The parallel arrangement of the fixing and contact parts ensures more precise and stable contact between the stationary and moving contacts. During the opening and closing of the circuit breaker, the parallel structure makes the contact between the moving and stationary contacts more uniform, maximizing the contact area and reducing contact resistance. Lower contact resistance reduces energy loss and heat generation, improves conductivity, and extends the service life of the contacts.
[0013] 3. The 90°-120° angle between the fixed part and the transition part provides excellent buffering during circuit breaker opening and closing. A significant impact force is generated when the moving contact contacts or separates from the stationary contact. This specific angle allows the transition part to distribute this impact force appropriately, preventing stress concentration at the connection point between the fixed and transition parts. Compared to other angles, this angle range allows the transition part to better absorb energy through elastic deformation, reducing direct impact on the fixed and contact parts, lowering the risk of contact structure damage due to excessive impact force, and thus extending the service life of the stationary contact. The 90°-120° angle also guides the arc to develop in a more favorable manner, preventing excessive erosion of the contacts by the arc.
[0014] 4. The presence of anti-slip holes increases the surface area of the fixing part. A larger surface area means more heat can be dissipated to the surrounding environment through the surface of the fixing part. When the circuit breaker is operating, the stationary contact generates heat due to the current flow. The heat dissipation effect of the anti-slip holes helps to reduce the temperature of the fixing part. Lower temperatures can improve the performance stability of the contact material, reduce material aging and deformation caused by high temperatures, and extend the service life of the stationary contact. The width of the arc-starting block is 1 / 3 to 1 / 2 of the width of the stationary contact body. This range can achieve a good balance in arc starting and extinguishing. If the arc-starting block is too narrow, its ability to guide the arc will be limited, and it may not be able to effectively guide the arc away from the main contact surface of the contact part, resulting in the arc still causing significant ablation of the contact part. If the arc-starting block is too wide, although the arc-starting ability may be enhanced, it will increase costs and may affect the normal conductivity of the contact part. When the width of the arc-starting block is within a suitable range, it can quickly guide the arc to itself when the circuit breaker generates an arc during opening and closing, protecting the main contact surface of the contact part. At the same time, a suitable width is also conducive to optimizing the path and shape of the electric arc, making it easier for the arc to be elongated, cooled and extinguished, improving the arc extinguishing efficiency and ensuring the opening and closing performance of the circuit breaker. Attached Figure Description
[0015] Figure 1 This is a three-dimensional structural diagram of the present invention;
[0016] Figure 1 Reference numerals: 1. Stationary contact body; 2. Fixing part; 3. Transition part; 4. Contact part; 5. Connecting part; 6. Threaded hole; 7. Through hole; 8. Arc-starting block; 9. Anti-slip hole. Detailed Implementation
[0017] Reference Figure 1 The embodiments of this utility model will be further described below.
[0018] For ease of explanation, spatial relative terms such as “up,” “down,” “left,” and “right” are used in the embodiments to describe the relationship of one element or feature shown in the figures relative to another element or feature. It should be understood that, in addition to the orientations shown in the figures, spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figures is inverted, an element described as being “down” of other elements or features would be positioned “up” of those other elements or features. Therefore, the exemplary term “down” can encompass both up and down orientations. The device may be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.
[0019] Moreover, relational terms such as “first” and “second” are used merely to distinguish one component from another that has the same name, without necessarily requiring or implying any such actual relationship or order between the components.
[0020] Figure 1 The diagram illustrates a novel stationary contact structure for a circuit breaker, comprising a stationary contact body 1. The stationary contact body 1 includes a fixing part 2, a transition part 3, and a contact part 4. These three parts are integrally formed, eliminating additional contact resistance caused by inter-component connections. This allows for smoother current conduction within the stationary contact, reducing energy loss during transmission. During frequent opening and closing of the circuit breaker, the stationary contact can withstand significant mechanical stress without structural damage. The transition part 3 includes two connecting pieces 5 positioned between the fixing part 2 and the contact part 4, acting as a buffer and transition element. These elements absorb and disperse impact forces during opening and closing, reducing direct damage to the fixing part 2 and the contact part 4. This ensures the stationary contact maintains good mechanical performance over long-term use, reducing the failure rate caused by structural loosening or damage, and improving the reliability and durability of the circuit breaker. The fixing part 2 has two symmetrical threaded holes 6 on one side near the transition part 3, which facilitates the quick fixing of the stationary contact to the corresponding position of the circuit breaker. The other side has a through hole 7, which increases the heat dissipation area, helps to reduce the contact temperature, and can also serve as a wiring channel to facilitate the connection and layout of internal circuits. The contact part 4 is equipped with an arc-inducing block 8. When the circuit breaker generates an arc during opening and closing, the arc-inducing block 8 guides the arc to itself, preventing the arc from directly eroding the main contact surface of the contact part 4.
[0021] The central axis of the through hole 7 is located on the axis of symmetry of the two threaded holes 6, further enhancing the symmetry of the fixing part 2 structure and making the static contact more evenly stressed in all directions during installation. When the static contact is fixed to the corresponding position of the circuit breaker through the threaded holes 6, the symmetrical structure ensures that the static contact is stably installed and will not tilt or deform due to uneven installation stress. During long-term operation of the circuit breaker, it can better resist external vibration and impact, maintain structural stability, thereby ensuring the reliability of electrical connections and reducing faults such as poor contact caused by structural instability.
[0022] The fixed part 2 and the contact part 4 are arranged in parallel, which ensures more precise and stable contact between the stationary contact and the moving contact. During the opening and closing of the circuit breaker, the parallel structure makes the contact between the moving contact and the stationary contact more uniform, maximizing the contact area and thus reducing contact resistance. Lower contact resistance reduces energy loss and heat generation, improves conductivity, and extends the service life of the contacts.
[0023] When the angle between the fixing part 2 and the transition part 3 is less than 90°, the small angle will change the electric field distribution around the stationary contact, causing the electric field to be too concentrated at the angle. This uneven electric field distribution is prone to partial discharge, which will corrode the contact material and reduce the insulation and conductivity of the contact. Long-term partial discharge may also lead to insulation breakdown, causing serious faults such as short circuits, threatening the safe operation of the power system. When the angle between the fixing part 2 and the transition part 3 is greater than 120°, the excessive angle will make the current conduction path inside the stationary contact longer and more tortuous, increasing the resistance. The larger resistance will lead to increased power loss and aggravated contact heating. Excessive temperature can degrade the performance of contact materials, such as reducing hardness and decreasing conductivity, further affecting the conductivity and reliability of the circuit breaker. Therefore, the optimal angle between the fixed part 2 and the transition part 3 is 90°-120°. The appropriate angle allows the transition part 3 to disperse the impact force generated at the moment of contact or separation between the moving contact and the stationary contact, avoiding stress concentration at the connection point between the fixed part 2 and the transition part 3. This allows the transition part 3 to better undergo elastic deformation to absorb energy, reducing the direct impact on the fixed part 2 and the contact part 4, lowering the risk of contact structure damage due to excessive impact force, and thus extending the service life of the stationary contact.
[0024] The fixing part 2 is provided with a plurality of evenly distributed anti-slip holes 9, which increases the surface area of the fixing part 2. The larger surface area means that more heat can be dissipated to the surrounding environment through the surface of the fixing part 2. When the circuit breaker is working, the stationary contact will generate heat due to the current passing through it. The heat dissipation effect of the anti-slip holes 9 helps to reduce the temperature of the fixing part 2. The lower temperature can improve the performance stability of the contact material, reduce material aging and deformation caused by high temperature, and extend the service life of the stationary contact.
[0025] When the width of the arc-initiating block 8 is less than 1 / 3 of the width of the stationary contact body 1, the arc-initiating block 8 is too narrow, and its ability to guide the arc will be limited. It may not be able to effectively guide the arc away from the main contact surface of the contact part 4, resulting in the arc still causing significant ablation of the contact part 4. When the width of the arc-initiating block 8 is greater than 1 / 2 of the width of the stationary contact body 1, the arc-initiating block 8 is too wide. Although the arc-initiating ability may be enhanced, it will increase costs and may affect the normal conductivity of the contact part 4. Therefore, the optimal width of the arc-initiating block 8 is 1 / 3 to 1 / 2 of the width of the stationary contact body 1. Within a suitable range, the arc-initiating block 8 can quickly guide the arc to itself when the circuit breaker generates an arc during opening and closing, protecting the main contact surface of the contact part 4. At the same time, a suitable width also helps to optimize the arc path and shape, making the arc easier to elongate, cool, and extinguish, improving the arc extinguishing efficiency and ensuring the opening and closing performance of the circuit breaker.
[0026] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any ordinary changes and substitutions made by those skilled in the art within the scope of the technical solution of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A novel circuit breaker stationary contact structure, comprising a stationary contact body (1), characterized in that, The stationary contact body (1) includes a fixing part (2), a transition part (3) and a contact part (4). The fixing part (2), the transition part (3) and the contact part (4) are integrally formed. The transition part (3) includes two connecting parts (5) disposed between the fixing part (2) and the contact part (4). The fixing part (2) has two threaded holes (6) symmetrically provided on one side near the transition part (3) and a through hole (7) on the other side. The contact part (4) is provided with an arc-starting block (8).
2. The novel circuit breaker stationary contact structure according to claim 1, characterized in that, The central axis of the through hole (7) is located on the axis of symmetry of the two threaded holes (6).
3. The novel circuit breaker stationary contact structure according to claim 1, characterized in that, The fixing part (2) is arranged in parallel with the contact part (4).
4. The novel circuit breaker stationary contact structure according to claim 1, characterized in that, The included angle between the fixing part (2) and the transition part (3) is 90°-120°.
5. The novel circuit breaker stationary contact structure according to claim 1, characterized in that, The fixing part (2) is provided with a number of evenly distributed anti-slip holes (9).
6. The novel circuit breaker stationary contact structure according to claim 1, characterized in that, The width of the arc-inducing block (8) is 1 / 3 to 1 / 2 of the width of the stationary contact body (1).