A contact assembly and circuit breaker

Abstract

The application provides a contact assembly and a circuit breaker, relates to the technical field of switches, and is used for improving the contact stability of a moving contact and a static contact and enhancing the safety performance of the circuit breaker. The contact assembly comprises the moving contact and the static contact. The moving contact has a connecting end and a contact end arranged oppositely. The contact end is provided with a protruding part on one side. The top surface of the protruding part is an outward convex circular arc surface, and the circular arc surface is outwardly expanded in the direction from the connecting end to the contact end. The static contact is provided with a static contact point on the side close to the moving contact. The static contact point is provided with a groove with an opening facing the protruding part. When the protruding part is in contact with the static contact point, the orthographic projection of the protruding part on the static contact point in the width direction of the moving contact is located in the groove. The cross section of the groove in the depth direction gradually decreases.

Description

Technical Field

[0001] This application relates to the field of switch technology, specifically to a contact assembly and a circuit breaker. Background Technology

[0002] A circuit breaker is an electrical device used to protect and control circuits. Its main function is to safely connect, carry, and disconnect the current in a circuit under normal or fault conditions, thereby ensuring electrical safety.

[0003] A circuit breaker typically consists of a moving contact and a stationary contact. When the moving contact is in contact with the stationary contact, the current in the circuit is connected, and the circuit breaker is in the closed state. When the moving contact is disconnected from the stationary contact, the current in the circuit is disconnected, and the circuit breaker is in the open state.

[0004] In the existing technology, the stationary contact is prone to tilting due to welding or bending, which results in low contact stability between the moving contact and the stationary contact and a decrease in the safety performance of the circuit breaker. Utility Model Content

[0005] This application provides a contact assembly and a circuit breaker to improve the contact stability between the moving contact and the stationary contact, thereby enhancing the safety performance of the circuit breaker.

[0006] To achieve the above objectives, in a first aspect, this application provides a contact assembly including a moving contact and a stationary contact. The moving contact has a connecting end and a contact end disposed opposite to each other. A protrusion is provided on one side of the contact end. The top surface of the protrusion is an outwardly convex arc surface, which expands outward in the direction from the connecting end to the contact end. A stationary contact point is provided on the side of the stationary contact near the moving contact. A groove with an opening facing the protrusion is provided on the stationary contact point. When the protrusion contacts the stationary contact point, in the width direction of the moving contact, the orthographic projection of the protrusion onto the stationary contact point lies within the groove. The cross-section of the groove gradually decreases in its depth direction.

[0007] When the above technical solution is adopted, during the process of the moving contact switching from the disengaged position to the contact position, when the protrusion just comes into contact with the stationary contact, the protrusion and the stationary contact are in point contact, and a certain point on the protrusion comes into contact with a certain point on the groove wall.

[0008] As the moving contact continues to rotate towards the contact position, the contact area between the protrusion and the stationary contact gradually increases, and the contact method between the protrusion and the stationary contact changes from point contact to line contact. In fact, at this time, the protrusion is in line contact with the groove wall on one side of the moving contact in the width direction.

[0009] As the moving contact continues to rotate towards the contact position, contact pressure is generated between the moving contact and the stationary contact. Because the cross-section of the groove gradually decreases along its depth direction, the groove wall is inclined relative to the protrusion. Relative sliding occurs between the protrusion and the groove wall, forcing the stationary contact to return to the preset position. This not only achieves the correction function for the stationary contact, but also ensures that after the stationary contact returns to the preset position, the protrusion forms line contact with the groove wall on both sides of the moving contact in the width direction.

[0010] Compared to the prior art where the moving contact and the stationary contact only have one contact line, the moving contact and the stationary contact provided in this application embodiment have two contact lines.

[0011] On the one hand, it increases the contact area between the moving contact and the stationary contact, and reduces the contact resistance between the moving contact and the stationary contact, effectively reducing the possibility of excessive internal resistance and excessive temperature rise during the circuit breaker's energization process, which can extend the service life of the circuit breaker and reduce the maintenance frequency.

[0012] On the other hand, when the moving contact contacts the stationary contact, the protrusion forms line contact with the groove wall on both sides of the moving contact in the width direction. The moving contact has a limiting effect on the stationary contact, which can improve the stability of the contact between the moving and stationary contacts. The circuit breaker has stable conductive continuity, ensuring the safe and reliable operation of the power system. At the same time, the contact resistance between the moving and stationary contacts is relatively stable, which can reduce the power loss of the circuit breaker in the closed state and improve the power transmission efficiency.

[0013] Furthermore, the groove wall can guide the electric arc generated when the moving contact and stationary contact are broken away, which is conducive to quickly breaking the arc, reducing the circuit switching time, and improving the segmentation performance of the circuit breaker.

[0014] In one possible implementation, the groove wall includes two opposing arcuate surfaces that intersect to form a first arc. When the protrusion contacts the stationary contact, the first arc lies on the first perpendicular plane of the moving contact, which is perpendicular to the width direction of the moving contact.

[0015] When the above technical solution is adopted, the two arc-shaped surfaces are symmetrically arranged about the first vertical plane when the protrusion contacts the stationary contact. The protrusion and the stationary contact are centered, which can improve the stability of the contact between the moving contact and the stationary contact. The circuit breaker has stable conductivity continuity and smooth current flow. At the same time, the contact resistance between the moving contact and the stationary contact is relatively stable, which can reduce the power loss of the circuit breaker in the closed state and improve the power transmission efficiency.

[0016] In one possible implementation, the arcuate surface has a first point, which is the point on the arcuate surface with the greatest vertical distance from the first perpendicular plane. Through the first point, the arcuate surface has a first tangent, which forms an angle α with the first plane, where 25° ≤ α ≤ 60°. The first plane is perpendicular to the depth direction of the groove. The first tangent lies on a second plane, and the first plane, the second plane, and the first perpendicular plane are all pairwise perpendicular.

[0017] The first arc has a second tangent at its endpoint. The second tangent forms an angle θ with the first plane, where 0° < θ ≤ 30°.

[0018] When the above technical solution is adopted, the angle between the first tangent and the first plane is 25°-60°, and the angle between the second tangent and the first plane is 0°-30°. This facilitates the rapid guidance of the electric arc generated when the moving contact and the stationary contact are separated along the arc-shaped surface, reducing the burn damage to the stationary contact caused by the arc. Simultaneously, it ensures stable contact between the moving contact and the stationary contact.

[0019] Furthermore, to prevent the angles between the first tangent and the first plane, and between the second tangent and the first plane, from being too small, it would be detrimental to the sliding and centered contact of the protrusion with the stationary contact during the rotation of the moving contact towards the contact position. Simultaneously, it would be detrimental to the guiding and transfer of the electric arc when the moving contact separates from the stationary contact.

[0020] Furthermore, if the angles between the first tangent and the first plane, and between the second tangent and the first plane, are too large, the moving contact will rotate too far from the disengaged position to the contact position, potentially leading to unstable contact between the moving and stationary contacts. Carbon buildup can also easily occur on the walls of the protrusions and grooves, increasing contact resistance and affecting the electrical performance of the circuit breaker.

[0021] In one possible implementation, the groove wall is part of a sphere.

[0022] When using the above technical solution, the stationary contact can be set arbitrarily in the circumferential direction of the groove during installation, which is beneficial for the installation of the stationary contact, can streamline the installation steps of the circuit breaker, and improve installation efficiency.

[0023] In addition, it can enrich the variety of grooves, making it easier to select and set them according to actual conditions.

[0024] In one possible implementation, the groove has a second tangent at its edge, and the second tangent has an angle β with the first plane, where 0° < β ≤ 30°, and the first plane is perpendicular to the depth direction of the groove.

[0025] When the above technical solution is adopted, the angle between the second tangent and the first plane is 0°-30°. This facilitates the rapid guidance of the electric arc generated when the moving contact and the stationary contact are separated along the spherical surface, reducing the burn damage of the stationary contact caused by the arc. At the same time, it ensures stable contact between the moving contact and the stationary contact.

[0026] Furthermore, to prevent the angle between the second tangent and the first plane from being too small, it would be detrimental to the sliding and centered contact between the protrusion and the stationary contact during the rotation of the moving contact towards the contact position. Simultaneously, it would hinder the guiding and transfer of the electric arc.

[0027] Furthermore, if the angle between the second tangent and the first plane is too large, the moving contact will rotate too far from the disengaged position to the contact position, potentially leading to unstable contact between the moving and stationary contacts. Carbon buildup can easily occur on the walls of the protrusions and grooves, increasing contact resistance and affecting the electrical performance of the circuit breaker.

[0028] In one possible implementation, the groove wall includes two intersecting third planes that intersect to form a second connecting line. This second connecting line is perpendicular to the depth direction of the groove. Furthermore, when the protrusion contacts the stationary contact, the second connecting line lies on a first perpendicular plane of the moving contact, which is perpendicular to the width direction of the moving contact.

[0029] When the above technical solution is adopted, the two third planes are symmetrically arranged about the first vertical plane when the protrusion contacts the stationary contact. The protrusion and stationary contact are centered, which improves the stability of the contact between the moving and stationary contacts, ensuring stable conductivity and smooth current flow in the circuit breaker. Simultaneously, the contact resistance between the moving and stationary contacts is relatively stable, reducing power loss in the closed state and improving energy transmission efficiency.

[0030] In addition, it can enrich the variety of grooves, making it easier to select and set them according to actual conditions.

[0031] In one possible implementation, the two third planes have an included angle δ, where 60°≤δ≤130°.

[0032] When the above technical solution is adopted, the included angle between the two third planes is 60°-130°. This facilitates the rapid guidance of the electric arc generated when the moving contact and the stationary contact are separated along the third plane, reducing the burn damage of the arc to the stationary contact. At the same time, it ensures stable contact between the moving contact and the stationary contact.

[0033] Furthermore, to prevent the included angle between the two third planes from being too small, it would be detrimental to the sliding and centering of the protrusion with the stationary contact during the rotation of the moving contact towards the contact position. Simultaneously, it would hinder the guiding and transfer of the electric arc.

[0034] Furthermore, if the included angle between the two third planes is too large, the moving contact will rotate too far from the disengaged position to the contact position, potentially leading to unstable contact between the moving and stationary contacts. Carbon buildup can easily occur on the walls of the protrusions and grooves, increasing contact resistance and affecting the electrical performance of the circuit breaker.

[0035] In one possible implementation, the groove wall is conical.

[0036] When using the above technical solution, the stationary contact can be set arbitrarily in the circumferential direction of the groove during installation, which is beneficial for the installation of the stationary contact, can streamline the installation steps of the circuit breaker, and improve installation efficiency.

[0037] In addition, it can enrich the variety of grooves, making it easier to select and set them according to actual conditions.

[0038] In one possible implementation, the cone has a cone angle γ, where 60°≤γ≤130°.

[0039] When the above technical solution is adopted, it is beneficial to quickly guide the electric arc generated when the moving contact and the stationary contact are separated along the conical surface, reducing the burn damage of the stationary contact caused by the electric arc. At the same time, it can ensure stable contact between the moving contact and the stationary contact.

[0040] In addition, to prevent the cone angle from being too small, it would be difficult for the protruding part to slide and make centered contact with the stationary contact during the rotation of the moving contact towards the contact position. At the same time, it would also be detrimental to the guiding and transfer of the electric arc.

[0041] In a second aspect, this application provides a circuit breaker that includes the contact assembly described in any possible implementation of the first aspect.

[0042] The technical effects of the circuit breaker provided in the second aspect can be referred to the technical effects of the contact assembly provided in the first aspect, and will not be elaborated here. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the contact assembly provided in an embodiment of this application.

[0044] Figure 2 This is a top view of the contact assembly provided in an embodiment of this application.

[0045] Figure 3 This is a schematic diagram of the structure of the moving contact provided in an embodiment of this application.

[0046] Figure 4 This is a side view of the moving contact provided in an embodiment of this application.

[0047] Figure 5 A front view schematic diagram of a stationary contact when the groove wall of the groove provided in the embodiment of this application includes two oppositely arranged arc-shaped surfaces.

[0048] Figure 6 for Figure 5 A top-down view.

[0049] Figure 7 for Figure 5 A cross-sectional schematic diagram of AA.

[0050] Figure 8 This is a top view of the stationary contact when the groove wall of the groove provided in the embodiment of this application is part of a spherical surface.

[0051] Figure 9 A top view of the stationary contact when the groove wall of the groove provided in the embodiment of this application includes two intersecting third planes.

[0052] Figure 10 A cross-sectional schematic diagram of the stationary contact when the groove wall of the groove provided in the embodiment of this application is conical.

[0053] Explanation of reference numerals in the attached figures: 1-Moving contact, 11-Protrusion, 12-First recess, 13-Second recess, 2-Stationary contact, 3-Stationary contact point, 31-Groove. 311 - Arc-shaped surface, 3111 - First tangent, 312 - Third plane, 313 - First arc. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0055] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims and drawings of this application are intended to cover non-exclusive inclusion.

[0056] The term "embodiment" as used herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of the phrase "embodiment" in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0057] The directional terms appearing in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. For example, in the description of this application, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0058] Furthermore, the terms "first," "second," etc., in the specification and claims of this application or in the aforementioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.

[0059] In the description of this application, unless otherwise stated, "multiple" means two or more (including two), and similarly, "multiple groups" means two or more (including two groups).

[0060] First, this application provides a circuit breaker, which is an electrical protection device for automatically or manually cutting off circuits. It is mainly used for overload protection, short circuit protection, leakage protection, etc., and is widely used in power systems, industrial equipment, building power distribution and household circuits.

[0061] Specifically, when the current in the circuit where the circuit breaker is located exceeds the rated value (e.g., 1.2 to 1.5 times), the circuit breaker will automatically trip within a certain period of time to prevent the wires from overheating and causing a fire, thus achieving overload protection.

[0062] When a short circuit occurs in the circuit where the circuit breaker is located (for example, the current suddenly increases by 10 to 100 times), the circuit breaker instantly (in milliseconds) disconnects the circuit to prevent equipment damage and achieve the short circuit protection function.

[0063] When leakage current (e.g., 30mA) is detected, the circuit breaker can interrupt the current in the circuit where it is located to prevent electric shock accidents and realize the leakage protection function.

[0064] In addition, operators can use handles or buttons to perform OFF and ON operations, so that the circuit breaker can switch between closed and open states.

[0065] In practice, a circuit breaker typically includes a housing, contact assembly, arc extinguishing device, and tripping mechanism.

[0066] The housing is typically made of plastic, which serves as insulation to prevent arc leakage. Meanwhile, the contact assembly, arc-extinguishing device, and tripping mechanism are mounted on the housing.

[0067] The housing can accommodate the contact assembly, arc extinguishing device, and tripping mechanism, providing a stable space for them to ensure normal operation without external interference. Simultaneously, the housing provides positioning and support for the contact assembly, arc extinguishing device, and tripping mechanism, preventing displacement or damage to components housed within the housing during operation.

[0068] The housing can also withstand a certain amount of external pressure, protecting the contact assembly, arc extinguishing device, tripping mechanism, etc. from damage. In addition, the housing has a protective function, preventing moisture, dust, dirt and other impurities from entering the housing, thereby avoiding corrosion or damage to the contact assembly, arc extinguishing device, tripping mechanism, etc. installed inside the housing.

[0069] The contact assembly includes a moving contact and a stationary contact. The moving contact has an engaged position and an disengaged position. The moving contact can rotate relative to the housing, allowing it to switch between the engaged and disengaged positions.

[0070] When the moving contact is in the contact position, it is in contact with the stationary contact. In fact, the moving contact is in contact with the stationary contact point set on the stationary contact, the current in the circuit where the circuit breaker is located is connected, and the circuit breaker is in the closed state.

[0071] When the moving contact is in the disengaged position, the moving contact is no longer in contact with the stationary contact, the current in the circuit where the circuit breaker is located is interrupted, and the circuit breaker is in the open state.

[0072] When a short circuit or overload occurs in the circuit where the circuit breaker is located, the tripping mechanism trips, driving the moving contact to switch from the contact position to the disengaged position. During the process of the moving contact separating from the stationary contact, an electric arc is generated. The arc is guided to the arc extinguishing device, which can extinguish the arc, protect the circuit breaker, and reduce damage.

[0073] In the existing technology, you can refer to Figure 1 and Figure 2 The stationary contact 2 in the circuit breaker is prone to tilting due to extensive welding or bending. This results in low contact stability between the moving contact and the stationary contact, and a decrease in the safety performance of the circuit breaker.

[0074] Currently, the common approach is to increase the size of the stationary contact to increase the contact area between the stationary contact and the moving contact. This results in a larger stationary contact structure, increasing both the amount of material used and the space it occupies.

[0075] Additionally, it should be noted that the surface where the moving contact contacts the stationary contact is an arc, meaning that the contact between the moving and stationary contacts is actually a line contact, and there is only one contact line between them. When the stationary contact is tilted, the contact line between the moving and stationary contacts will shorten further, further affecting the contact stability between them.

[0076] In view of the problems existing in the above-mentioned prior art, please refer to Figure 1 and Figure 2 As shown in the figure, this application embodiment provides a contact assembly, which includes a moving contact 1 and a stationary contact 2.

[0077] Similarly, the moving contact 1 provided in this embodiment has a contact position and a disengaged position. When the moving contact 1 is in the contact position, the moving contact 1 is in contact with the stationary contact 2. The circuit current of the circuit breaker is connected, and the circuit breaker is in a closed state.

[0078] When the moving contact 1 is in the disengaged position, the moving contact 1 is no longer in contact with the stationary contact 2, the current in the circuit where the circuit breaker is located is interrupted, and the circuit breaker is in the open state.

[0079] The moving contact 1 has a connecting end and a contact end that are disposed opposite to each other. A protrusion 11 is provided on one side of the contact end.

[0080] In fact, such as Figure 3 and Figure 4 As shown, the moving contact 1 has a plate-like structure. A protrusion 11 can be provided on one side of the plate-like moving contact 1. Alternatively, recesses can be provided at intervals on one side of the moving contact 1, with the protrusion 11 formed between the two recesses.

[0081] like Figure 3 and Figure 4 As shown, the moving contact 1 provided in this embodiment has a first recess 12 and a second recess 13, both located on the same side of the contact end. The first recess 12 is located on the side of the protrusion 11 closer to the connection end. The second recess 13 is located on the side of the protrusion 11 away from the connection end. That is, the first recess 12, the protrusion 11, and the second recess 13 are arranged sequentially from the connection end to the contact end. The protrusion 11 is used to contact the stationary contact 2.

[0082] The arrangement of the first recess 12 and the second recess 13 allows the generated arc to move away from the protrusion 11 along the first recess 12 and the second recess 13 during the process of the moving contact 1 switching from the contact position to the disengagement position. This quickly guides the arc away, helps to reduce the energy of the arc, extinguish the arc, and reduce the possibility of damage to the moving contact 1 and the stationary contact 2 by the arc.

[0083] The specific structure of the moving contact 1 is not specifically limited here. The specific structure, material, and dimensions of the first recess 12, the second recess 13, and the protrusion 11 are also not limited here, and shall be subject to the actual situation.

[0084] Please combine Figure 3 and Figure 4 As shown, the top surface of the protrusion 11 is an outwardly convex arc surface, and the arc surface expands outward in the direction from the connecting end to the contact end. In this case, the size of the protrusion 11 remains consistent in the width direction of the moving contact 1.

[0085] It should be noted that the direction from the connecting end to the contact end can be parallel to the length direction of the moving contact 1, and the direction from the connecting end to the contact end is perpendicular to the width direction of the moving contact 1.

[0086] A stationary contact 3 is provided on the side of the stationary contact 2 closest to the moving contact 1. The structure of the stationary contact 2 can be referred to... Figure 1 and Figure 2 As shown, the dimensions and materials of the stationary contact 2 are not specifically limited here.

[0087] The stationary contact 3 can be made of an alloy material, and its structure can be a cylinder, a cube, or a cuboid. Of course, this is just an example and is not intended to be a specific limitation.

[0088] The stationary contact 3 is fixedly mounted on the stationary contact 2. For example, the stationary contact 3 can be fixedly mounted on the stationary contact 2 by welding, snap-fitting, or riveting. Of course, the actual method is not limited to these.

[0089] It should be noted that when the protrusion 11 of the moving contact 1 comes into contact with the stationary contact 3 of the stationary contact 2, the moving contact 1 and the stationary contact 2 are in contact.

[0090] Please combine Figures 1 to 6 As shown, the stationary contact 3 is provided with a groove 31 with its opening facing the protrusion 11. The specific structure and dimensions of the groove 31 are not limited here, and the actual situation shall prevail.

[0091] When the protrusion 11 contacts the stationary contact 3, the orthographic projection of the protrusion 11 onto the stationary contact 3 is located within the groove 31 in the width direction of the moving contact 1. That is, in the width direction of the moving contact 1, the size of the protrusion 11 is smaller than the size of the opening of the groove 31, so that when the protrusion 11 contacts the stationary contact 3, the groove wall of the groove 31 contacts the protrusion 11.

[0092] The cross-section of the groove 31 gradually decreases along its depth direction. The span of the groove 31 also gradually decreases along its depth direction.

[0093] Thus, during the process of the moving contact 1 switching from the disengaged position to the contact position, when the protrusion 11 just comes into contact with the stationary contact 3, the protrusion 11 and the stationary contact 3 are in point contact, and a certain point on the protrusion 11 contacts a certain point on the groove wall of the groove 31.

[0094] As the moving contact 1 continues to rotate toward the contact position, the contact area between the protrusion 11 and the stationary contact 3 gradually increases, and the contact mode between the protrusion 11 and the stationary contact 3 changes from point contact to line contact. In fact, at this time, the protrusion 11 is in line contact with the groove wall of the groove 31 on one side of the width direction of the moving contact 1.

[0095] As the moving contact 1 continues to rotate towards the contact position, contact pressure is generated between the moving contact 1 and the stationary contact 2. Since the cross-section of the groove 31 gradually decreases in its depth direction, the groove wall of the groove 31 is inclined relative to the protrusion 11. Relative sliding occurs between the protrusion 11 and the groove wall of the groove 31, forcing the stationary contact 3 to return to the preset position. This not only achieves the correction function for the stationary contact 3, but also ensures that after the stationary contact 3 returns to the preset position, the protrusion 11 forms line contact with the groove wall of the groove 31 on both sides of the moving contact 1 in the width direction.

[0096] Compared to the prior art, where the moving contact 1 and the stationary contact 2 only have one contact line, the moving contact 1 and the stationary contact 2 in the embodiments of this application have two contact lines.

[0097] On the one hand, it increases the contact area between the moving contact 1 and the stationary contact 2, and reduces the contact resistance between the moving contact 1 and the stationary contact 2, effectively reducing the possibility of excessive internal resistance and excessive temperature rise during the circuit breaker's energization process, which can extend the service life of the circuit breaker and reduce the maintenance frequency.

[0098] On the other hand, when the moving contact 1 contacts the stationary contact 2, the protrusion 11 forms line contact with the groove wall of the groove 31 on both sides of the moving contact 1 in the width direction. The moving contact 1 has a limiting effect on the stationary contact 3, which can improve the stability of the contact between the moving contact 1 and the stationary contact 2. The circuit breaker has stable conductivity continuity, and the current flows smoothly, ensuring the safe and reliable operation of the power system. At the same time, the contact resistance between the moving contact 1 and the stationary contact 2 is relatively stable, which can reduce the power loss of the circuit breaker in the closed state and improve the power transmission efficiency.

[0099] Furthermore, the groove wall of the groove 31 can guide the electric arc generated when the moving contact 1 and the stationary contact 2 are broken away, which is conducive to quickly breaking the arc, reducing the circuit switching time, and improving the segmentation performance of the circuit breaker.

[0100] It should be noted that the static contact 3 provided in this application embodiment can be used not only in circuit breakers, but also in contactors, disconnect switches and other switching devices.

[0101] In one example, please combine Figure 1 , Figure 2 and Figures 5 to 7 As shown, the groove wall of the groove 31 includes two opposing arc-shaped surfaces 311, which intersect to form a first arc 313. When the protrusion 11 contacts the stationary contact 3, the first arc 313 is located on the first vertical plane of the moving contact 1, and the first vertical plane is perpendicular to the width direction of the moving contact 1.

[0102] At this time, when the protrusion 11 contacts the stationary contact 3, the two arc-shaped surfaces 311 are symmetrically arranged about the first vertical plane. The protrusion 11 and the stationary contact 3 are centered, which can improve the stability of the contact between the moving contact 1 and the stationary contact 2. The circuit breaker has stable conductivity continuity and smooth current flow. At the same time, the contact resistance between the moving contact 1 and the stationary contact 2 is relatively stable, which can reduce the power loss of the circuit breaker in the closed state and improve the power transmission efficiency.

[0103] In specific implementation, the radius of curvature of the arc surface 311 is not specifically limited here. By reasonable design, the arc surface 311 and the circular arc surface can be matched so that both sides of the protrusion 11 in the width direction of the moving contact 1 can contact the groove wall of the groove 31, thereby ensuring the contact area between the moving contact 1 and the stationary contact 2.

[0104] In some embodiments, such as Figure 6As shown, the arc-shaped surface 311 has a first point, which is the point on the arc-shaped surface 311 with the largest vertical distance from the first perpendicular plane. Through the first point, the arc-shaped surface 311 has a first tangent, which forms an angle α with the first plane, where 25°≤α≤60°. The first plane is perpendicular to the depth direction of the groove. The first tangent lies on a second plane, and the first plane, the second plane, and the first perpendicular plane are all perpendicular to each other.

[0105] In addition, such as Figure 7 As shown, the first arc 313 has a second tangent at its endpoint. The second tangent has an angle θ with the first plane, where 0° < θ ≤ 30°.

[0106] The angle between the first tangent and the first plane is 25°-60°, and the angle between the second tangent and the first plane is 0°-30°. This facilitates the rapid guidance of the electric arc generated when the moving contact 1 and the stationary contact 2 are separated along the arc-shaped surface 311, reducing the burn damage to the stationary contact 3 caused by the arc. Simultaneously, it ensures stable contact between the moving contact 1 and the stationary contact 2.

[0107] Furthermore, to prevent the angles between the first tangent and the first plane, and between the second tangent and the first plane, from being too small, it would be detrimental to the sliding and central contact of the protrusion 11 and the stationary contact 3 during the rotation of the moving contact 1 towards the contact position. Simultaneously, when the moving contact 1 disengages from the stationary contact 3, it would be detrimental to the guiding and transfer of the electric arc.

[0108] Furthermore, if the angles between the first tangent and the first plane, and the second tangent and the first plane, are too large, the moving contact 1 will rotate too far from the disengaged position to the contact position, potentially leading to unstable contact between the moving contact 1 and the stationary contact 2. Carbon deposits can easily accumulate on the walls of the protrusion 11 and the groove 31, increasing contact resistance and affecting the electrical performance of the circuit breaker.

[0109] In practice, the angle α between the first tangent and the first plane can be 25°, 30°, 35°, 40°, 45°, 48°, 50°, 51°, 55°, 60°, etc. Of course, this is just an example and is not intended as a specific limitation.

[0110] The angle θ between the second tangent and the first plane can be 5°, 8°, 10°, 12°, 15°, 20°, 22°, 25°, 26°, 30°, etc. Of course, this is just an example and is not intended as a specific limitation.

[0111] It should be noted that, in the embodiments provided in this application, the side of the stationary contact away from the moving contact can be located within the first plane.

[0112] In another example, please refer to Figure 8As shown, the groove wall of groove 31 is part of a sphere.

[0113] Thus, when installing the stationary contact 3, the stationary contact 3 can be set arbitrarily in the circumferential direction of the groove 31, which is beneficial to the installation of the stationary contact 3, can streamline the installation steps of the circuit breaker, and improve the installation efficiency.

[0114] In addition, it can enrich the variety of grooves 31, making it easier to select and set them according to actual conditions.

[0115] In practical implementation, the groove wall and arc surface of the groove 31 can be matched by reasonable design so that both sides of the protrusion 11 in the width direction of the moving contact 1 can contact the groove wall of the groove 31, so as to ensure the contact area between the moving contact 1 and the stationary contact 2.

[0116] In specific implementation, such as Figure 8 As shown, when the groove wall of the groove 31 is part of a sphere, the groove 31 has a second tangent at the edge of the groove 31, and the second tangent has an angle β with the first plane, 0°<β≤30°, and the first plane is perpendicular to the depth direction of the groove 31.

[0117] The angle between the second tangent and the first plane is 0°-30°. This angle facilitates the rapid guidance of the electric arc generated when the moving contact 1 and the stationary contact 2 are separated along the spherical surface, reducing the burn damage of the arc to the stationary contact 3. At the same time, it ensures stable contact between the moving contact 1 and the stationary contact 2.

[0118] Furthermore, to prevent the angle between the tangent of the second tangent and the first plane from being too small, it would be detrimental to the sliding and centered contact between the protrusion 11 and the stationary contact 3 during the rotation of the moving contact 1 towards the contact position. Simultaneously, it would hinder the guiding and transfer of the electric arc.

[0119] Furthermore, if the angle between the second tangent and the first plane is too large, the moving contact 1 will rotate too far from the disengaged position to the contact position, potentially leading to unstable contact between the moving contact 1 and the stationary contact 2. Carbon deposits can easily accumulate on the walls of the protrusion 11 and the groove 31, increasing contact resistance and affecting the electrical performance of the circuit breaker.

[0120] In specific implementations, the angle β between the tangent of the groove 31 and the second plane can be 5°, 7°, 10°, 15°, 18°, 20°, 21°, 24°, 25°, 30°, etc. Of course, this is just an example and is not intended as a specific limitation.

[0121] As an example, please combine Figure 1 , Figure 2 and Figure 9As shown, the groove wall of the groove 31 includes two intersecting third planes 312, which intersect to form a second connecting line. The second connecting line is perpendicular to the depth direction of the groove 31. When the protrusion 11 contacts the stationary contact 3, the second connecting line is located on the first perpendicular plane of the moving contact 1, which is perpendicular to the width direction of the moving contact 1.

[0122] At this time, when the protrusion 11 contacts the stationary contact 3, the two third planes 312 are symmetrically arranged about the first vertical plane, and the protrusion 11 and the stationary contact 3 are centered, which can improve the stability of the contact between the moving contact 1 and the stationary contact 2, and the circuit breaker has stable conductivity continuity and smooth current flow. At the same time, the contact resistance between the moving contact 1 and the stationary contact 2 is relatively stable, which can reduce the power loss of the circuit breaker in the closed state and improve the power transmission efficiency.

[0123] In addition, it can enrich the variety of grooves 31, making it easier to select and set them according to actual conditions.

[0124] In practice, through reasonable design, the third plane 312 and the arc surface can be matched so that both sides of the protrusion 11 in the width direction of the moving contact 1 can contact the third plane 312, thereby ensuring the contact area between the moving contact 1 and the stationary contact 2.

[0125] In actual operation, such as Figure 9 As shown, there is an included angle δ between the two third planes 312, where 60°≤δ≤130°.

[0126] The included angle between the two third planes 312 is 60°-130°. This angle facilitates the rapid guidance of the electric arc generated when the moving contact 1 is separated from the stationary contact 2 along the third plane 312, reducing the burn damage of the arc to the stationary contact 3. At the same time, it ensures stable contact between the moving contact 1 and the stationary contact 2.

[0127] Furthermore, to prevent the included angle between the two third planes 312 from being too small, it would be detrimental to the sliding and centered contact between the protrusion 11 and the stationary contact 3 during the rotation of the moving contact 1 towards the contact position. At the same time, it would also be detrimental to the guiding and transfer of the electric arc.

[0128] Furthermore, if the included angle between the two third planes 312 is too large, the moving contact 1 will rotate too far from the disengaged position to the contact position, potentially leading to unstable contact between the moving contact 1 and the stationary contact 2. Carbon can easily accumulate on the walls of the protrusion 11 and the groove 31, increasing the contact resistance and affecting the electrical performance of the circuit breaker.

[0129] In practice, the included angle δ between the two third planes 312 can be 60°, 75°, 85°, 90°, 100°, 116°, 120°, 125°, 130°, etc. Of course, this is just an example and is not intended as a specific limitation.

[0130] As another embodiment, please combine Figure 1 , Figure 2 and Figure 10 As shown, the groove wall of groove 31 is conical.

[0131] Thus, when installing the stationary contact 3, the stationary contact 3 can be set arbitrarily in the circumferential direction of the groove 31, which is beneficial to the installation of the stationary contact 3, can streamline the installation steps of the circuit breaker, and improve the installation efficiency.

[0132] In addition, it can enrich the variety of grooves 31, making it easier to select and set them according to actual conditions.

[0133] In practical implementation, the cone has a cone angle γ, such as Figure 10 As shown, 60°≤γ≤130°.

[0134] The cone angle is 60°-130°. This angle helps to quickly guide the electric arc generated when the moving contact 1 is separated from the stationary contact 2 along the cone surface, reducing the burn damage of the arc to the stationary contact 3. At the same time, it ensures stable contact between the moving contact 1 and the stationary contact 2.

[0135] In addition, to prevent the cone angle from being too small, it would be difficult for the protrusion 11 and the stationary contact 3 to slide and make centered contact during the rotation of the moving contact 1 towards the contact position. At the same time, it would be difficult to guide and transfer the electric arc.

[0136] In practice, the cone angle γ can be 60°, 65°, 70°, 75°, 78°, 90°, 100°, 115°, 120°, 130°, etc. Of course, this is just an example and is not intended as a specific limitation.

[0137] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, "connection" or "joining" in mechanical structures can refer to a physical connection. A physical connection can be a fixed connection, such as a connection secured by fasteners, such as a connection secured by screws, bolts, or other fasteners; a physical connection can also be a detachable connection, such as a snap-fit ​​or interlocking connection; a physical connection can also be an integral connection, such as a connection formed by welding, bonding, or integral molding. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

Claims

1. A contact assembly, characterized in that, include: The moving contact has a connecting end and a contact end that are arranged opposite to each other; a protrusion is provided on one side of the contact end; the top surface of the protrusion is an outwardly convex arc surface, and the arc surface expands outward in the direction from the connecting end to the contact end. A stationary contact has a stationary contact point on the side of the stationary contact near the moving contact; the stationary contact point has a groove with an opening facing the protrusion; when the protrusion contacts the stationary contact point, the orthographic projection of the protrusion onto the stationary contact point in the width direction of the moving contact is located within the groove; the cross-section of the groove gradually decreases in its depth direction.

2. The contact assembly according to claim 1, characterized in that, The groove wall includes two opposing arc surfaces, which intersect to form a first arc; when the protrusion contacts the stationary contact, the first arc is located on the first perpendicular surface of the moving contact, and the first perpendicular surface is perpendicular to the width direction of the moving contact.

3. The contact assembly according to claim 2, characterized in that, The arc-shaped surface has a first point, which is the point on the arc-shaped surface with the largest vertical distance from the first perpendicular plane; the arc-shaped surface has a first tangent line passing through the first point; the first tangent line has an angle α with the first plane, 25°≤α≤60°; the first plane is perpendicular to the depth direction of the groove; the first tangent line is located on a second plane, and the first plane, the second plane, and the first perpendicular plane are all perpendicular to each other; The first arc has a second tangent at its endpoint; the second tangent has an angle θ with the first plane, where 0° < θ ≤ 30°.

4. The contact assembly according to claim 1, characterized in that, The groove wall is part of a sphere.

5. The contact assembly according to claim 4, characterized in that, At the edge of the groove, the groove has a second tangent, and the second tangent has an angle β with the first plane, where 0° < β ≤ 30°; the first plane is perpendicular to the depth direction of the groove.

6. The contact assembly according to claim 1, characterized in that, The groove wall includes two intersecting third planes, which intersect to form a second connecting line; the second connecting line is perpendicular to the depth direction of the groove; and when the protrusion contacts the stationary contact, the second connecting line is located on the first perpendicular plane of the moving contact, which is perpendicular to the width direction of the moving contact.

7. The contact assembly according to claim 6, characterized in that, The two third planes are at an angle δ, where 60°≤δ≤130°.

8. The contact assembly according to claim 1, characterized in that, The groove wall is conical.

9. The contact assembly according to claim 8, characterized in that, The cone has a cone angle γ, where 60°≤γ≤130°.

10. A circuit breaker, characterized in that, Includes the contact assembly as described in any one of claims 1 to 9.

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