An electric leakage circuit breaker stationary contact
Patent Information
- Application Number
- CN202522190277.1
- 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
[0002]现有漏电断路器静触头存在诸多不足，部分静触头装配便利性差，与安装板等部件的连接需焊接或复杂固定方式，易出现松动、移位，影响与动触头配合精度，降低断路器可靠性；在电弧应对上，一些静触头结构无法有效缩短电弧在触点停留时间，弧柱对静触点损伤大，缩短静触头使用寿命，且整体温升控制不佳，影响断路器性能；还有些静触头磁吹力设计不合理，电弧引入灭弧室不顺畅，降低分断效率与效果，甚至可能因电弧处理不及时引发电路故障
[0011]1.第一部分、弯折部分以及第二部分采用一体成型结构，使得静触头整体结构强度大幅提升，在漏电断路器频繁的分合闸操作过程中，会产生较大的机械应力，一体成型的设计能够有效抵抗这些应力，防止静触头出现断裂、变形等问题。第一部分上的第一通孔和第二通孔以及第二部分上的第三通孔，为静触头的安装提供了极大的灵活性。在不同型号、规格的漏电断路器中，可以根据实际需求选择合适的安装方式，通过这些通孔使用螺栓等连接件将静触头牢固地固定在相应位置。弯折部分中部设有镂空的适配槽，在保证静触头结构强度和性能的前提下，有效地减轻了静触头的整体重量。第二部分一端的矩形凸台能够与断路器的其他部件实现精准配合，在装配过程中，矩形凸台可以作为定位基准，确保静触头与其他部件的相对位置准确无误，保证了触头之间的接触精度和分合闸性能。
Smart Images
Figure CN224922690U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of circuit breaker technology, and more specifically, to a stationary contact of a residual current circuit breaker. Background Technology
[0002] Existing residual current circuit breakers (RCCBs) have several shortcomings in their stationary contacts. Some stationary contacts are difficult to assemble, requiring welding or complex fixing methods to connect with mounting plates and other components. This can easily lead to loosening or displacement, affecting the accuracy of the connection with the moving contacts and reducing the reliability of the circuit breaker. In terms of arc handling, some stationary contact structures cannot effectively shorten the arc's residence time at the contact point. The arc column causes significant damage to the stationary contacts, shortening their service life, and the overall temperature rise is poorly controlled, affecting the circuit breaker's performance. Furthermore, some stationary contacts have unreasonable magnetic blowout force designs, resulting in unsmooth arc introduction into the arc-extinguishing chamber, reducing breaking efficiency and effectiveness, and potentially even causing circuit failures due to untimely arc handling. Utility Model Content
[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a residual current circuit breaker stationary contact with reasonable structure, which can improve magnetic blowing force, reduce arc damage, facilitate assembly and control cost.
[0004] To achieve the above objectives, this utility model provides the following technical solution: a residual current circuit breaker stationary contact, comprising a long strip-shaped stationary contact body, the stationary contact body comprising a first part, a bent part, and a second part, the first part, the bent part, and the second part being integrally formed, the first part being provided with a first through hole and a second through hole for installation and fitting, the second part being provided with a third through hole for installation and fitting, the middle part of the bent part being provided with a hollowed-out adapter groove, and one end of the second part being provided with a rectangular boss for fitting with other components of the circuit breaker.
[0005] The present invention is further configured such that: the first through hole is a large-diameter through hole and is surrounded by regularly arranged dot-matrix protrusions, and the second and third through holes are small-diameter through holes.
[0006] The present invention is further configured such that the height of the dot matrix protrusions is 0.1-0.5mm and the spacing between adjacent protrusions is 0.5-1mm.
[0007] The present invention is further configured such that the length of the rectangular boss is less than the width of the second part, and the height of the rectangular boss is 1 / 4 to 1 / 3 of the thickness of the second part.
[0008] The present invention is further configured such that the width of the adapter groove is 1 / 2 to 2 / 3 of the width of the bent portion.
[0009] The present invention is further configured such that: the static contact body is made of a high conductivity metal material, wherein the metal material is copper or silver-plated copper alloy.
[0010] The beneficial effects of this utility model are:
[0011] 1. The first part, the bent part, and the second part adopt an integrated molding structure, which significantly improves the overall structural strength of the stationary contact. During the frequent opening and closing operations of the residual current circuit breaker, significant mechanical stress is generated. The integrated molding design effectively resists these stresses and prevents problems such as breakage and deformation of the stationary contact. The first and second through holes on the first part and the third through hole on the second part provide great flexibility for the installation of the stationary contact. In different models and specifications of residual current circuit breakers, the appropriate installation method can be selected according to actual needs. The stationary contact is firmly fixed in the corresponding position using bolts or other connectors through these through holes. The bent part has a hollow adapter groove in the middle, which effectively reduces the overall weight of the stationary contact while ensuring the structural strength and performance of the stationary contact. The rectangular boss at one end of the second part can achieve precise matching with other components of the circuit breaker. During assembly, the rectangular boss can serve as a positioning reference to ensure the accurate relative position of the stationary contact with other components, ensuring the contact accuracy and opening and closing performance between the contacts.
[0012] 2. The first through hole is designed with a large diameter to accommodate larger bolts or connectors, providing stronger tightening force during installation. The surrounding regularly arranged dot-matrix protrusions embed into the surface of the contacting component when the connector is tightened, increasing friction and engagement force. In vibration environments, this effectively prevents loosening or displacement of the stationary contact from other components, ensuring the stability of the entire residual current circuit breaker structure and reducing the risk of malfunctions due to insecure installation. The second and third through holes are designed with small diameters for auxiliary positioning and fixing. When installing the stationary contact, the small-diameter through holes allow for initial positioning using smaller connectors, ensuring accurate placement of the stationary contact. When the height of the dot-matrix protrusions is between 0.1-0.5mm, the protrusions effectively embed into the surface of the mating components during installation, increasing friction and preventing loosening of the stationary contact; however, they are not too high and may break or deform during installation. The spacing between adjacent protrusions is 0.5-1mm, which makes the protrusions reasonably distributed. This provides sufficient friction without causing the protrusions to squeeze and deform each other due to excessive spacing, thus ensuring the integrity and functionality of the protrusions during installation.
[0013] 3. A reasonable height for the boss is between 1 / 4 and 1 / 3 of the thickness of the second part. If the boss is too high, it will increase the center of gravity of the component, reduce its stability, and may also cause the boss itself to bend or break under stress. If the height is too low, the boss will not be able to fully exert its function of enhancing structural strength and rigidity. Within this specific height range, the boss can effectively enhance the bending and torsional resistance of the second part, optimizing the overall strength and rigidity of the component and better meeting the mechanical requirements in actual use.
[0014] 4. When the width of the adapter groove is 1 / 2 to 2 / 3 of the width of the bent portion, this reasonable width ratio not only improves the assembly efficiency with external connectors and ensures the stability of the overall structure, but also allows for a more even distribution of stress, reducing the risk of localized stress concentration and extending the service life of the component. The stationary contact body is made of high-conductivity metals such as pure copper or silver-plated copper alloy, which have excellent conductivity and low resistivity. When current passes through the stationary contact, low resistivity means less energy loss, effectively reducing heat generation. Silver-plated copper alloy further enhances conductivity; silver has excellent conductivity among metals, and the silver plating layer reduces contact resistance, allowing current to flow more smoothly through the stationary contact. Attached Figure Description
[0015] Figure 1 This is a three-dimensional structural diagram of the present invention;
[0016] Figure 1 Reference numerals in the attached drawings: 1. Stationary contact body; 2. First part; 3. Bending part; 4. Second part; 5. First through hole; 6. Second through hole; 7. Third through hole; 8. Adaptor groove; 9. Rectangular boss; 10. Dot matrix protrusion. 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 residual current circuit breaker (RCCB) stationary contact, comprising a long, strip-shaped stationary contact body 1. The stationary contact body 1 includes a first part 2, a bent part 3, and a second part 4, all integrally formed. The bending of the stationary contact body 1 to form the first part 2, the bent part 3, and the second part 4 significantly enhances the overall structural strength of the stationary contact. During the frequent opening and closing operations of the RCCB, substantial mechanical stress is generated. The integrally formed design effectively resists these stresses, preventing problems such as breakage and deformation of the stationary contact. The first part 2 has a first through hole 5 and a second through hole 6 for installation, and the second part 4 has a third through hole 7 for installation, providing great flexibility for the installation of the stationary contact. For different models and specifications of RCCBs, a suitable installation method can be selected according to actual needs. Bolts and other connectors are used through these through holes to firmly fix the stationary contact in the corresponding position. This effectively reduces the overall weight of the stationary contact while ensuring its structural strength and performance. The bent portion 3 has a hollowed-out adapter groove 8 in the middle, and one end of the second portion 4 has a rectangular boss 9 that cooperates with other components of the circuit breaker. During assembly, the rectangular boss 9 can serve as a positioning reference to ensure that the relative position of the stationary contact with other components is accurate, thus guaranteeing the contact accuracy and opening / closing performance between the contacts.
[0021] The first through hole 5 is a large-diameter through hole surrounded by regularly arranged dot-matrix protrusions 10. The large diameter of the first through hole 5 allows it to accommodate larger bolts or connectors, providing stronger tightening force during installation. The regularly arranged dot-matrix protrusions 10 embed into the surface of the contacting component when the connector is tightened, increasing friction and engagement force. In vibration environments, this effectively prevents loosening or displacement between the stationary contact and other components, ensuring the stability of the entire residual current circuit breaker structure and reducing the risk of malfunctions due to insecure installation. The second through hole 6 and the third through hole 7 are small-diameter through holes, used for auxiliary positioning and fixing. When installing the stationary contact, the small-diameter through holes allow for initial positioning using smaller connectors, ensuring accurate positioning of the stationary contact.
[0022] The height of the dot-matrix protrusions 10 is 0.1-0.5mm. These protrusions effectively embed into the surface of the mating components during installation, increasing friction and preventing loosening of the stationary contacts, while also forming a heat dissipation structure. The height is not too low, resulting in limited surface area and narrowed heat dissipation channels, which would hinder heat dissipation; nor is it too high, preventing breakage or deformation during installation, which could damage the contact structure and affect connection stability. The spacing between adjacent protrusions is 0.5-1mm, ensuring a reasonable distribution. This provides sufficient friction, preventing excessive spacing that could cause deformation due to mutual compression, thus maintaining the integrity and functionality of the protrusions during installation. It also prevents narrowing of the channels between protrusions due to insufficient spacing, which could obstruct airflow and hinder heat dissipation, potentially leading to contact overheating. Conversely, excessive spacing prevents uneven pressure distribution, which could cause excessive local pressure, localized contact deformation, and affect contact performance and mechanical strength.
[0023] The length of the rectangular boss 9 is less than the width of the second part 4, so the stress can be distributed more evenly on the second part 4, reducing the risk of local deformation and damage and enhancing the structural stability of the entire component.
[0024] When the height of the rectangular boss 9 is less than 1 / 4 of the thickness of the second part 4, its support and reinforcement effect on the second part 4 will be greatly reduced. Under external force, the second part 4 may not receive sufficient support and is prone to deformation or damage. For example, under vertical pressure, the boss cannot effectively distribute the pressure, resulting in excessive local stress in the second part 4, which may lead to bending or breakage. When the height of the rectangular boss 9 is greater than 1 / 3 of the thickness of the second part 4, the excessively high boss will raise the center of gravity of the entire component, reducing the stability of the component. Under external force, the component is more likely to tilt or sway. For example, in some equipment that needs to maintain stability, a raised center of gravity may lead to instability during operation, increasing the risk of equipment failure. Therefore, the optimal height of the rectangular boss 9 is 1 / 4 to 1 / 3 of the thickness of the second part 4. The boss can effectively enhance the bending and torsional resistance of the second part 4, optimizing the overall strength and stiffness of the component and better meeting the mechanical requirements in actual use.
[0025] When the width of the adapter groove 8 is less than half the width of the bent portion 3, the adapter groove 8 is too small. During the actual assembly process with external components, operators may need to spend more time and effort, and may even need to use additional tools for forced assembly. This will not only reduce assembly efficiency, but may also damage the bent portion 3 during the assembly process. When the width of the adapter groove 8 is greater than two-thirds of the width of the bent portion 3, the friction with the external connector is reduced, and a reliable connection cannot be formed. During equipment operation, the bent portion 3 may move freely within the external connector, leading to a loose connection. Therefore, the optimal width of the adapter groove 8 is one-half to two-thirds of the width of the bent portion 3. A reasonable width ratio not only improves the assembly efficiency with external connectors and ensures the stability of the overall structure, but also allows for a more uniform distribution of stress, reduces the risk of local stress concentration, and extends the service life of the components.
[0026] The stationary contact body 1 is made of a high-conductivity metal material, such as copper or a silver-plated copper alloy, which has good conductivity and low resistivity. When current passes through the stationary contact, low resistivity means less energy loss and effectively reduces heat generation. The silver-plated copper alloy further enhances conductivity; silver has excellent conductivity among metals, and the silver plating layer reduces contact resistance, allowing current to flow more smoothly through the stationary contact. The above description is only a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Ordinary variations and substitutions made by those skilled in the art within the scope of this utility model's technical solution should be included within the protection scope of this utility model.
Claims
1. A residual current circuit breaker stationary contact, comprising a long strip-shaped stationary contact body (1), characterized in that, The stationary contact body (1) includes a first part (2), a bent part (3) and a second part (4). The first part (2), the bent part (3) and the second part (4) are integrally formed. The first part (2) is provided with a first through hole (5) and a second through hole (6) for installation and mating. The second part (4) is provided with a third through hole (7) for installation and mating. The bent part (3) has a hollowed-out adapter groove (8) in the middle. The second part (4) has a rectangular boss (9) at one end for mating with other components of the circuit breaker.
2. The stationary contact of a residual current circuit breaker according to claim 1, characterized in that, The first through hole (5) is a large-diameter through hole and is surrounded by regularly arranged dot-matrix protrusions (10), while the second through hole (6) and the third through hole (7) are small-diameter through holes.
3. The stationary contact of a residual current circuit breaker according to claim 2, characterized in that, The height of the dot matrix protrusions (10) is 0.1-0.5 mm, and the spacing between adjacent protrusions is 0.5-1 mm.
4. The stationary contact of a residual current circuit breaker according to claim 1, characterized in that, The length of the rectangular boss (9) is less than the width of the second part (4), and the height of the rectangular boss (9) is 1 / 4 to 1 / 3 of the thickness of the second part (4).
5. A residual current circuit breaker stationary contact according to claim 1, characterized in that, The width of the adapter groove (8) is 1 / 2 to 2 / 3 of the width of the bent portion (3).
6. The stationary contact of a residual current circuit breaker according to claim 1, characterized in that, The stationary contact body (1) is made of a high conductivity metal material, which is copper or silver-plated copper alloy.