Moving contact assembly and circuit breaker

Abstract

The application discloses a moving contact assembly and a circuit breaker, and relates to the technical field of circuit breakers. The moving contact assembly comprises a contact support, a first moving contact and a second moving contact. The first moving contact and the second moving contact are connected to the contact support in parallel. A linkage column and a first boss are arranged on one side of the first moving contact close to the second moving contact. The linkage column and the first boss are integrally formed with the first moving contact. A linkage hole matched with the linkage column and a second boss opposite to the first boss are arranged on one side of the second moving contact close to the first moving contact. The linkage hole and the second boss are integrally formed with the second moving contact. The linkage column is inserted into the linkage hole, and the top surface of the first boss abuts against the top surface of the second boss. The moving contact assembly and the circuit breaker provided by the application can reduce the processing cost of the moving contact assembly, thereby reducing the overall production cost of the circuit breaker.

Description

Technical Field

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

[0002] In molded case circuit breakers, to meet the temperature rise requirements during operation, the moving contact usually needs to adopt a double contact structure. A gap needs to be maintained between the two contacts to achieve effective heat dissipation. At the same time, during the opening and closing process of the molded case circuit breaker, the two contacts need to have a high degree of synchronicity to ensure that the double contact structure can simultaneously disconnect or close with the stationary contact, so as to ensure the normal operation performance of the molded case circuit breaker.

[0003] In existing technologies, a linkage and a limiting component are typically installed between the two contacts. The linkage ensures synchronous operation between the two contacts, while the limiting component maintains a distance between them. Both the linkage and the limiting component are individually machined and are usually made of copper, resulting in high production costs for the moving contact assembly and consequently, high overall production costs for the molded case circuit breaker.

[0004] Therefore, there is an urgent need to provide a moving contact assembly to solve the problems existing in the prior art. Utility Model Content

[0005] The purpose of this application is to provide a moving contact assembly and a circuit breaker that can reduce the production cost of the moving contact assembly, thereby reducing the overall production cost of the circuit breaker.

[0006] In a first aspect, embodiments of this application provide a moving contact assembly, including a contact support, a first moving contact, and a second moving contact, which are rotatably connected side-by-side to the contact support. A linkage post and a first boss are spaced apart on the side of the first moving contact closest to the second moving contact; both the linkage post and the first boss are integrally formed with the first moving contact. A linkage hole adapted to the linkage post and a second boss opposite to the first boss are spaced apart on the side of the second moving contact closest to the first moving contact; both the linkage hole and the second boss are integrally formed with the second moving contact. The linkage post is inserted into the linkage hole, and the top surface of the first boss abuts against the top surface of the second boss.

[0007] The above solution not only enables the synchronous operation of the first and second moving contacts through the insertion and connection of the linkage column and linkage hole, but also ensures a stable gap between the first and second moving contacts by the abutment of the first and second bosses, thus meeting the core requirements of the moving contact assembly during use. Furthermore, the integrated molding of the linkage column, first boss, and first moving contact, as well as the integrated molding of the linkage hole, second boss, and second moving contact, eliminates the need for separate machining of linkage and limiting components as in traditional solutions. This reduces additional material consumption and assembly operations, effectively lowering the processing cost of the moving contact assembly.

[0008] In some examples, the linkage post is located at the end of the first moving contact away from the contact support, the first boss is located at the end of the first moving contact near the rotating part of the contact support, and the length of the linkage post is greater than the depth of the linkage hole.

[0009] By positioning the mating positions of the linkage post and the linkage hole, as well as the mating positions of the first and second bosses, at intervals at both ends of the moving contact, the linkage effect and the spacing effect can be separated, avoiding mutual interference. Simultaneously, by setting the length of the linkage post to be greater than the depth of the linkage hole, the linkage post can simultaneously achieve the linkage effect and the spacing effect, ensuring a stable gap at both ends of the moving contact under dual limiting conditions.

[0010] In some examples, the difference between the length of the linkage post and the depth of the linkage hole is equal to the sum of the protrusion height of the first boss and the protrusion height of the second boss.

[0011] The above scheme ensures that the first moving contact and the second moving contact remain parallel at all times. Whether in the closed or open position, the gap between the first moving contact and the second moving contact is uniform, which not only ensures the effectiveness of the heat dissipation channel, but also ensures that the linkage force is evenly transmitted at both ends, reducing structural deformation caused by uneven force.

[0012] In some examples, the linkage column and the linkage hole adopt a transition fit or clearance fit, and the fit clearance is less than or equal to 0.1mm.

[0013] By limiting the clearance between the linkage column and the linkage hole within this range, the linkage accuracy and motion tolerance can be balanced, effectively reducing the impact of excessively large or small clearances on the linkage accuracy of the first and second moving contacts, and improving linkage accuracy.

[0014] In some examples, the contact support is provided with a receiving cavity, the size of which is adapted to the sum of the thickness of the first moving contact, the protrusion height of the first boss, the thickness of the second moving contact, and the protrusion height of the second boss, based on the thickness direction of the first moving contact and the second moving contact.

[0015] The above scheme provides a limiting function on the side of the first moving contact away from the second moving contact and on the side of the second moving contact away from the first moving contact. This reduces the risk of separation between the first and second moving contacts and ensures structural stability and operational reliability, thereby improving the functional reliability of the moving contact assembly.

[0016] In some examples, the contact support is also provided with a rotating shaft, the rotating part of the first moving contact is provided with a first connecting hole, the rotating part of the second moving contact is provided with a second connecting hole, the first moving contact is rotatably connected to the rotating shaft through the first connecting hole, the second moving contact is rotatably connected to the rotating shaft through the second connecting hole, and the axes of the first connecting hole and the second connecting hole are collinear.

[0017] By using the design of the rotating shaft and the first and second connecting holes on the coaxial axis, the first and second moving contacts can rotate in the same circle, so that the first and second moving contacts can remain synchronized during operation, which also helps to improve assembly accuracy and operational stability.

[0018] In some examples, the first boss includes an integrally formed annular portion and an extension. The annular portion is coaxial with the first connecting hole, and the inner diameter of the annular portion is greater than or equal to the diameter of the first connecting hole. The extension is located on the side of the annular portion away from the linkage post. The second boss has the same shape as the first boss and is arranged symmetrically.

[0019] The annular portion in the first boss is designed to accommodate the rotational characteristics of the moving contact, ensuring that the first and second moving contacts remain in contact during rotation, thus maintaining a stable interval between their rotating portions. Simultaneously, the extension portion, while maintaining the interval with the annular portion, further enhances the stability of the positioning.

[0020] In some examples, the protrusion height of the first boss is the same as that of the second boss.

[0021] Setting the protrusion height of the first boss and the second boss to be the same can ensure the stability of the structure of the first moving contact and the second moving contact, and make the limiting force on the first moving contact and the second moving contact evenly distributed, which is conducive to maintaining a stable interval.

[0022] In some examples, the linkage column, the first boss, and the second boss are all formed by stamping.

[0023] The use of stamping forming for the above-mentioned parts can avoid material waste and significantly improve the connection strength with the first moving contact body or the second moving contact body, so as to ensure that the first moving contact and the second moving contact have high structural stability while maintaining a stable interval and stable linkage.

[0024] Secondly, embodiments of this application also provide a circuit breaker, including a stationary contact and the aforementioned moving contact assembly, wherein the first moving contact and the second moving contact of the moving contact assembly can simultaneously contact or separate from the stationary contact.

[0025] The beneficial effects of the circuit breakers provided in the second aspect and the various possible designs of the second aspect can be found in the first aspect and the various possible implementations of the first aspect, and will not be repeated here. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the overall structure of the moving contact assembly provided in the embodiments of this application.

[0028] Figure 2 A first view of the combined state of the first moving contact and the second moving contact provided in an embodiment of this application.

[0029] Figure 3 This is a schematic diagram of the structure of the first moving contact provided in an embodiment of this application.

[0030] Figure 4 This is a schematic diagram of the structure of the second moving contact provided in an embodiment of this application.

[0031] Figure 5 A second view of the combined state of the first moving contact and the second moving contact provided in an embodiment of this application.

[0032] Figure 6 Provided for the embodiments of this application Figure 5 Sectional view at point AA.

[0033] Figure 7 This is a schematic diagram of the contact support structure provided in an embodiment of this application.

[0034] Explanation of reference numerals in the attached drawings: 100, moving contact assembly; 1, contact support; 11, receiving cavity; 12, rotating shaft; 2, first moving contact; 21, linkage post; 22, first boss; 221, annular portion; 222, extension portion; 23, first connecting hole; 3, second moving contact; 31, linkage hole; 32, second boss; 33, second connecting hole. Detailed Implementation

[0035] 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, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0037] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0038] In the description of this application, it should be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and for 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. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0039] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0040] In molded case circuit breakers of 800A and above, a double-contact structure is typically required for the moving contacts to meet the temperature rise requirements during operation. A gap must be maintained between the two contacts to allow for heat dissipation. At the same time, during the closing and opening process, the two moving contacts are required to have high synchronicity of action to ensure that they can disconnect from the stationary contact as simultaneously as possible, thereby guaranteeing the normal operating performance of the circuit breaker.

[0041] In existing technologies, linkage and limiting components are generally set between two moving contacts. However, due to insufficient strength of plastic parts and the fact that iron parts are prone to vibration due to magnetic force after the moving contacts are energized, copper materials are usually used, which leads to excessively high production costs and results in high overall production costs for molded case circuit breakers.

[0042] Based on this, the present application provides a moving contact assembly and a circuit breaker, which can reduce the processing cost of the moving contact assembly, thereby reducing the overall production cost of the circuit breaker.

[0043] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0044] Please refer to Figures 1 to 6 This embodiment provides a moving contact assembly 100, including a contact support 1, a first moving contact 2, and a second moving contact 3. The first moving contact 2 and the second moving contact 3 are rotatably connected side-by-side to the contact support 1. A linkage post 21 and a first boss 22 are spaced apart on the side of the first moving contact 2 closest to the second moving contact 3. Both the linkage post 21 and the first boss 22 are integrally formed with the first moving contact 2. A linkage hole 31 adapted to the linkage post 21 and a second boss 32 opposite to the first boss 22 are spaced apart on the side of the second moving contact 3 closest to the first moving contact 2. Both the linkage hole 31 and the second boss 32 are integrally formed with the second moving contact 3. The linkage post 21 is inserted into the linkage hole 31, and the top surface of the first boss 22 abuts against the top surface of the second boss 32.

[0045] The above solution not only enables the synchronous operation of the first moving contact 2 and the second moving contact 3 by the insertion and engagement of the linkage column 21 and the linkage hole 31, but also ensures the stability of the gap between the first moving contact 2 and the second moving contact 3 by the abutment of the first boss 22 and the second boss 32, thus meeting the requirements of heat dissipation and accurate operation of the moving contact assembly 100 during use. Furthermore, the design of the linkage column 21, the first boss 22, and the first moving contact 2 being integrally formed, and the linkage hole 31, the second boss 32, and the second moving contact 3 being integrally formed, eliminates the need for separate machining of linkage components and limiting components in traditional solutions, reducing additional material consumption and assembly operations, thereby effectively lowering the processing cost of the moving contact assembly 100.

[0046] Among them, reference Figure 1 The contact support 1 is used to support the first moving contact 2 and the second moving contact 3. The first moving contact 2 and the second moving contact 3 are rotatably connected to the contact support 1. The first moving contact 2, the second moving contact 3 and the contact support 1 can rotate together to the open position or the closed position to correspond to the open or closed action.

[0047] Specifically, refer to Figures 2 to 4The first moving contact 2 and the second moving contact 3 are arranged side by side. On the side of the first moving contact 2 closest to the second moving contact 3, a linkage post 21 and a first boss 22 are spaced apart, and both the linkage post 21 and the first boss 22 are integrally formed with the first moving contact 2. Correspondingly, on the side of the second moving contact 3 closest to the first moving contact 2, a linkage hole 31 and a second boss 32 are spaced apart. The size and shape of the linkage hole 31 are adapted to the linkage post 21, and the second boss 32 is arranged opposite to the first boss 22. Similarly, the linkage hole 31 and the second boss 32 are also integrally formed with the second moving contact 3.

[0048] The first moving contact 2 and the second moving contact 3 both adopt an integrated structure, which can avoid gaps or looseness that may occur during separate assembly. There are no weak connection points between the linkage column 21 and the body of the first moving contact 2, and between the first boss 22 and the body of the first moving contact 2. In the frequent operation of closing and opening, the force transmission is more direct and reliable, reducing the action delay or deviation caused by loose parts, and ensuring that the two moving contacts always maintain consistent action.

[0049] Furthermore, the integrated structure eliminates stress concentration at the split connection points, better withstands the impact force during closing and the arc force during opening, reduces the probability of deformation or damage, and extends the service life of the moving contact assembly 100.

[0050] During the assembly process, the linkage post 21 on the first moving contact 2 is directly inserted into the linkage hole 31 on the second moving contact 3. The linkage post 21 and the linkage hole 31 are connected to form a stable linkage mechanism, so that the first moving contact 2 and the second moving contact 3 keep the same position and synchronize their actions when performing opening and closing operations. This avoids the situation where the first moving contact 2 and the second moving contact 3 are out of sync with the stationary contact in the circuit breaker during opening and closing operations, and reduces the possibility of damage to the moving contact assembly 100.

[0051] At the same time, refer to Figure 5 The top surface of the first protrusion 22 abuts against the top surface of the second protrusion 32. Through this abutting relationship, the distance between the first moving contact 2 and the second moving contact 3 can be limited, ensuring that a stable gap is always maintained between the two moving contacts, providing necessary space for heat dissipation of the moving contacts, and avoiding damage to the moving contacts due to insufficient gap affecting heat dissipation.

[0052] In one alternative embodiment, the linkage post 21 can be set as a cylinder or a prism or similar form. Correspondingly, the shape of the linkage hole 31 is completely consistent with the shape of the linkage post 21 so as to form a stable plug-in fit.

[0053] In addition, multiple linkage columns 21 can be provided, and the number of linkage holes 31 is the same as the number of linkage columns 21, and their positions correspond one-to-one, which is conducive to further improving the linkage stability between the first moving contact 2 and the second moving contact 3.

[0054] The top surface of the first protrusion 22 abuts against the top surface of the second protrusion 32. The shapes of the first protrusion 22 and the second protrusion 32 can be the same or different, as long as their top surfaces have overlapping contact areas. In this embodiment, the first protrusion 22 and the second protrusion 32 have the same shape, and the top surfaces of the first protrusion 22 and the second protrusion 32 overlap and abut against each other to form a stable limiting relationship, ensuring that the first moving contact 2 and the second moving contact 3 maintain a heat dissipation gap.

[0055] Reference Figures 2 to 4 In some examples, the linkage post 21 is located at the contact end of the first moving contact 2 away from the contact support 1, the first boss 22 is located at the rotating end of the first moving contact 2 near the contact support 1, and the length of the linkage post 21 is greater than the depth of the linkage hole 31.

[0056] By positioning the mating positions of the linkage post 21 and the linkage hole 31, as well as the mating positions of the first boss 22 and the second boss 32, at intervals at both ends of the moving contact, the linkage function and the interval function can be separated, avoiding mutual interference. Simultaneously, by setting the length of the linkage post 21 to be greater than the depth of the linkage hole 31, the linkage post 21 can simultaneously achieve the linkage function and the interval function, ensuring a stable gap at both ends of the moving contact under dual limiting conditions.

[0057] The first moving contact 2, with its contact portion away from the contact support 1, is used to contact the stationary contact to achieve conduction. The first moving contact 2, with its rotating portion close to the contact support 1, is used to rotatably connect with the contact support 1. The second moving contact 3 also has a contact portion and a rotating portion, and its function is the same as that of the first moving contact 2.

[0058] Specifically, refer to Figures 2 to 4 The first protrusion 22 is disposed at one end of the rotating part of the first moving contact 2, and the corresponding second protrusion 32 is disposed at one end of the rotating part of the second moving contact 3. The first protrusion 22 and the second protrusion 32 abut against each other so that the rotating part of the first moving contact 2 and the rotating part of the second moving contact 3 are kept apart.

[0059] A linkage post 21 is disposed at one end of the contact portion of the first moving contact 2, and a corresponding linkage hole 31 is disposed at one end of the contact portion of the second moving contact 3. At the same time, the length of the linkage post 21 is greater than the depth of the linkage hole 31. The difference between the length of the linkage post 21 and the depth of the linkage hole 31 can be used to enable the linkage post 21 to not only achieve linkage with the linkage hole 31, but also to achieve the function of spacing between the first moving contact 2 and the second moving contact 3, so that the contact portion of the first moving contact 2 and the contact portion of the second moving contact 3 are kept apart.

[0060] The contact between the linkage column 21 and the linkage hole 31, along with the contact between the first boss 22 and the second boss 32, forms a double limit at one end of the contact portion and one end of the rotating portion of the moving contact, ensuring that both ends of the two moving contacts maintain a stable gap width.

[0061] Compared to relying solely on the first protrusion 22 and the second protrusion 32 to achieve single-end limiting, the double-end limiting can effectively prevent the first moving contact 2 and the second moving contact 3 from tilting or shifting due to uneven force, ensuring uniform gaps. This not only guarantees the stability of the heat dissipation channel but also avoids abnormal temperature rise caused by excessively small local gaps.

[0062] Reference Figures 3 to 6 In some examples, the difference between the length of the linkage post 21 and the depth of the linkage hole 31 is equal to the sum of the protrusion height of the first boss 22 and the protrusion height of the second boss 32.

[0063] The above scheme ensures that the first moving contact 2 and the second moving contact 3 remain parallel at all times. Whether in the closed or open position, the gap between the first moving contact 2 and the second moving contact 3 is uniform, which not only ensures the effectiveness of the heat dissipation channel, but also ensures that the linkage force is evenly transmitted at both ends, reducing structural deformation caused by uneven force.

[0064] For example, refer to Figure 6 In this embodiment, the linkage post 21 is disposed on the side of the first moving contact 2 near the second moving contact 3, and the extension length of the linkage post 21 based on the first moving contact 2 is 6mm. The linkage hole 31 is disposed on the side of the second moving contact 3 near the first moving contact 2, and the depth of the linkage hole 31 is 3.5mm. In this way, the portion of the linkage post 21 inserted into the linkage hole 31 can cooperate with the linkage hole 31 to achieve a linkage function, and the difference between the length of the linkage post 21 and the depth of the linkage hole 31, 2.5mm, is the interval distance between the contact portion of the first moving contact 2 and the contact portion of the second moving contact 3.

[0065] Correspondingly, the sum of the protrusion heights of the first protrusion 22 and the second protrusion 32 is set to 2.5mm, which is the same as the distance between the contact portion of the first moving contact 2 and the contact portion of the second moving contact 3, so that the distance between the contact portions and the rotation portions of the first moving contact 2 and the second moving contact 3 are consistent, so as to ensure that the first moving contact 2 and the second moving contact 3 as a whole have good heat dissipation effect, while not affecting the normal operation of the linkage function.

[0066] Reference Figure 6 In some examples, the linkage column 21 and the linkage hole 31 adopt a transition fit or clearance fit, and the fit clearance is less than or equal to 0.1mm.

[0067] By limiting the clearance between the linkage column 21 and the linkage hole 31 within this range, the linkage accuracy and motion tolerance can be balanced, effectively reducing the impact of excessively large or small clearances on the linkage accuracy of the first moving contact 2 and the second moving contact 3, and improving the linkage accuracy.

[0068] From the perspective of choosing the fit method, transition fit or clearance fit is more suitable for the linkage requirements of moving contacts than interference fit. A transition fit allows for a small gap or slight interference between the linkage pin 21 and the linkage hole 31, ensuring a stable connection while avoiding assembly difficulties or deformation that may result from an interference fit. A clearance fit, on the other hand, provides space for the relative movement of the linkage pin 21 and the linkage hole 31 by reserving a small gap. This fit method allows the two moving contacts to transmit force through the contact between the linkage pin 21 and the linkage hole 31 during synchronous operation, while also accommodating minor dimensional fluctuations caused by machining errors or temperature changes, ensuring smooth and uninterrupted operation.

[0069] The clearance is limited to within 0.1mm. If the clearance is too large, the linkage column 21 will wobble radially in the linkage hole 31, causing the two moving contacts to deviate. As a result, when closing, one of the moving contacts may contact the stationary contact first, and when opening, there may be a problem of asynchronous separation, which cannot meet the synchronization requirements.

[0070] If the gap is too small, assembly errors, dust adhesion, or thermal expansion may cause the linkage to jam, affecting the normal operation of the circuit breaker. A gap of less than 0.1mm can effectively limit radial wobble, ensure accurate force transmission between the linkage column 21 and the linkage hole 31, and guarantee the consistency of the action of the first moving contact 2 and the second moving contact 3. It can also provide space for minor deformations or trace impurities in the linkage column 21 or the linkage hole 31, avoiding failure of the linkage function due to minor abnormalities.

[0071] Furthermore, this type of fit reduces the impact of the electric arc on the linkage post 21 and linkage hole 31. At the moment of arc generation during circuit breaking, the small fit gap reduces the probability of the arc intruding into the linkage gap between the linkage post 21 and linkage hole 31, preventing the arc from causing ablation on the surface of the linkage post 21 or linkage hole 31. At the same time, this fit also reduces air ionization caused by excessive gaps, lowers the risk of arc reignition, and indirectly improves the arc extinguishing reliability of the circuit breaker.

[0072] Reference Figure 2 and Figure 7 In some examples, the contact support 1 is provided with a receiving cavity 11. Based on the thickness direction of the first moving contact 2 and the second moving contact 3, the size of the receiving cavity 11 is adapted to the sum of the thickness of the first moving contact 2, the protrusion height of the first boss 22, the thickness of the second moving contact 3, and the protrusion height of the second boss 32.

[0073] The above scheme provides a limiting function on the side of the first moving contact 2 away from the second moving contact 3 and on the side of the second moving contact 3 away from the first moving contact 2. This reduces the risk of separation between the first moving contact 2 and the second moving contact 3 and ensures structural stability and operational reliability, thereby improving the functional reliability of the moving contact assembly 100.

[0074] Specifically, the rotating part of the first moving contact 2 and the rotating part of the second moving contact 3 are installed in the receiving cavity 11. The inner wall of the receiving cavity 11 forms a lateral limit from the side of the first moving contact 2 away from the second moving contact 3 and the side of the second moving contact 3 away from the first moving contact 2. Since the width of the receiving cavity 11 is adapted to the sum of the thicknesses of the two moving contacts, there is no extra gap between the inner wall of the receiving cavity 11 and the first moving contact 2 and the second moving contact 3. This can effectively limit the displacement of the first moving contact 2 and the second moving contact 3 in the lateral direction and prevent the two moving contacts from separating from each other during operation due to vibration, arc impact force or operating force.

[0075] Meanwhile, the lateral restraint of the receiving cavity 11 can also enhance the overall structural strength of the moving contact assembly 100. When a strong electric arc is generated during circuit breaking, the arc will exert a force that moves the first moving contact 2 and the second moving contact 3 away from each other. Under the lateral restraint of the receiving cavity 11, a certain support can be provided for the first moving contact 2 and the second moving contact 3, offsetting part of the arc impact force, reducing the risk of deformation of the first moving contact 2 and the second moving contact 3, and extending their service life.

[0076] Reference Figures 2 to 4In some examples, the contact support 1 is also provided with a rotating shaft 12, the rotating part of the first moving contact 2 is provided with a first connecting hole 23, the rotating part of the second moving contact 3 is provided with a second connecting hole 33, the first moving contact 2 is rotatably connected to the rotating shaft 12 through the first connecting hole 23, the second moving contact 3 is rotatably connected to the rotating shaft 12 through the second connecting hole 33, and the axes of the first connecting hole 23 and the second connecting hole 33 are collinear.

[0077] The design of the rotating shaft 12 in conjunction with the first connecting hole 23 and the second connecting hole 33 on the same axis ensures that the first moving contact 2 and the second moving contact 3 rotate in the same circle, so that the first moving contact 2 and the second moving contact 3 remain synchronized during operation, which also helps to improve assembly accuracy and operational stability.

[0078] Reference Figures 2 to 4 The first connecting hole 23 is opened in the rotating part of the first moving contact 2, and the second connecting hole 33 is opened in the rotating part of the second moving contact 3. The first moving contact 2 is rotatably connected to the rotating shaft 12 through the first connecting hole 23, and the second moving contact 3 is connected to the rotating shaft 12 through the second connecting hole 33. The first connecting hole 23 and the second connecting hole 33 are coaxial, so as to ensure that the rotation centers of the first moving contact 2 and the second moving contact 3 are consistent, so that the first moving contact 2 and the second moving contact 3 can maintain synchronous operation.

[0079] Furthermore, the collinearity of the axes of the first connecting hole 23 and the second connecting hole 33 means that the rotation centers of the first moving contact 2 and the second moving contact 3 coincide, and no relative torsion or misalignment will occur during rotation. When the linkage column 21 and the linkage hole 31 transmit force, the collinear rotation axis can keep the torque on the first moving contact 2 and the second moving contact 3 balanced, avoiding action delay caused by torque deviation.

[0080] For example, if there is a deviation between the axes of the first connecting hole 23 and the second connecting hole 33, the driving force of the first moving contact 2 on the second moving contact 3 will fluctuate due to the change in lever arm when the first moving contact 2 rotates, which may cause the second moving contact 3 to lag in action and disrupt synchronization. The coaxial design, on the other hand, ensures stable torque transmission, so that the rotation angle and speed of the first moving contact 2 and the second moving contact 3 remain consistent.

[0081] Furthermore, the first moving contact 2 and the second moving contact 3 rotate around the same axis, making their relative positional relationship more stable. The contact between the first boss 22 and the second boss 32, and the fit between the linkage column 21 and the linkage hole 31 are less likely to be misaligned due to deviations in the rotation trajectory, thereby ensuring the uniformity of the gap between the first moving contact 2 and the second moving contact 3, and indirectly enhancing the heat dissipation effect and the stability of electrical performance.

[0082] Reference Figure 3 and Figure 4In some examples, the first boss 22 includes an integrally formed annular portion 221 and an extension 222. The annular portion 221 is coaxial with the first connecting hole 23, and the inner diameter of the annular portion 221 is greater than or equal to the diameter of the first connecting hole 23. The extension 222 is located on the side of the annular portion 221 away from the linkage post 21. The second boss 32 has the same shape as the first boss 22 and is arranged symmetrically.

[0083] The annular portion 221 in the first boss 22 is designed to adapt to the rotational characteristics of the moving contact, so that the first moving contact 2 and the second moving contact 3 remain in contact during rotation, thereby maintaining a stable interval between the rotating portions of the first moving contact 2 and the second moving contact 3. Simultaneously, the extension portion 222, while maintaining the interval with the annular portion 221, further enhances the stability of the positioning.

[0084] Specifically, refer to Figure 3 and Figure 4 The annular portion 221 of the first boss 22 is coaxially arranged with the first connecting hole 23, and the inner diameter of the annular portion 221 is not less than the diameter of the first connecting hole 23, so as to form an annular boss on the periphery of the first connecting hole 23. The annular portion 221 of the second boss 32 is coaxially arranged with the second connecting hole 33, and the inner and outer diameters of the annular portion 221 of the second boss 32 and the annular portion 221 of the first boss 22 are the same, so as to form an annular boss corresponding to the annular portion 221 of the first boss 22 on the periphery of the second connecting hole 33.

[0085] The top surfaces of the two annular protrusions abut against each other. During the rotation of the first moving contact 2 and the second moving contact 3 around the rotating shaft 12, the annular portion 221 of the first protrusion 22 and the annular portion 221 of the second protrusion 32 are always in contact, so as to play a stable limiting role on the circumference of the rotating shaft 12.

[0086] This design aligns the rotation center of the first protrusion 22 with that of the first moving contact 2. When the first moving contact 2 rotates around the shaft 12, the annular portion 221 rotates synchronously around the connecting hole, ensuring that the contact surface of the first protrusion 22 always maintains a circumferential distribution that matches the rotation trajectory. Compared to a non-coaxial design, this coaxial layout avoids the displacement of the contact position of the first protrusion 22 due to rotation, ensuring that the first protrusion 22 and the second protrusion 32 maintain a stable contact relationship throughout the entire rotation process, thereby continuously and reliably limiting the gap between the two moving contacts.

[0087] The extension 222 is located on the side of the annular portion 221 away from the linkage post 21, and its function is to expand the limiting contact area based on the annular portion 221. The annular portion 221 mainly undertakes the circumferential limiting function around the rotation center, while the extension 222 extends away from the linkage post 21, so that the abutment point of the first boss 22 is closer to the edge area of ​​the first moving contact 2. This arrangement can form a balanced structure with the linkage post 21 at one end of the contact portion, where forces are distributed at both ends.

[0088] When the first moving contact 2 and the second moving contact 3 are subjected to lateral force, the extension 222 and the linkage column 21 form support at the rotating part and the contact end respectively, so as to prevent the first moving contact 2 and the second moving contact 3 from tilting due to unilateral force, and further ensure the uniformity of the gap.

[0089] The second boss 32 and the first boss 22 are designed with the same shape and symmetrical arrangement to ensure that the contact surfaces of the first boss 22 and the second boss 32 are perfectly matched. When the annular portion 221 and the extension portion 222 of the first moving contact 2 contact the corresponding part of the second moving contact 3, a uniform contact stress distribution can be formed, avoiding local stress concentration caused by shape mismatch and reducing the risk of wear or deformation of the first boss 22 and the second boss 32. At the same time, the symmetrical design makes the structure of the first moving contact 2 and the second moving contact 3 more consistent, which is convenient for manufacturing through a unified mold and reduces production complexity.

[0090] Furthermore, the integral molding design of the first boss 22 with the body of the first moving contact 2 and the second boss 32 with the body of the second moving contact 3 allows the annular portion 221 and the extension portion 222 to directly utilize the material strength of the moving contact, without the need for additional reinforcement structures to withstand the force during contact. This integrated structure avoids the connection loosening problem that may occur with separate bosses, ensuring the long-term stability and reliability of the limiting function.

[0091] Reference Figures 3 to 5 In some examples, the protrusion height of the first boss 22 is the same as the protrusion height of the second boss 32.

[0092] The first protrusion 22 and the second protrusion 32 are set to the same height, which can ensure the structural stability of the first moving contact 2 and the second moving contact 3, and make the limiting force on the first moving contact 2 and the second moving contact 3 evenly distributed, thereby helping to maintain a stable interval.

[0093] Reference Figure 5 and Figure 6The first boss 22 and the second boss 32 have the same height. The gap formed when they abut each other is twice the height of a single boss. This gap creates a symmetrical support relationship between the first moving contact 2 and the second moving contact 3. This symmetrical gap distribution ensures that the gap of the rotating part of the moving contact is consistent with the gap of the contact part, avoiding tilting of the moving contact due to uneven gaps at both ends. This ensures the uniformity of the heat dissipation channel and meets the temperature rise control requirements under high current scenarios.

[0094] During the closing and opening of a circuit breaker, the moving contact is subjected to various external forces, such as arc impact and the driving force of the operating mechanism. If the first boss 22 and the second boss 32 are of different heights, the higher boss will bear more limiting force, which is prone to local stress concentration. Long-term use may lead to boss deformation or accelerated wear. On the other hand, the first boss 22 and the second boss 32 of the same height can evenly distribute the external force to the contact surface of the first boss 22 and the second boss 32, reducing the local stress load and extending the service life.

[0095] At the same time, when the first boss 22 and the second boss 32 are at the same height, the sum of their heights is exactly twice the height of a single boss, and the size difference between the linkage column 21 and the linkage hole 31 also corresponds to this value, so that the gap between the moving contact part and the rotating part is perfectly matched, further improving the stability of the synchronous operation of the first moving contact 2 and the second moving contact 3.

[0096] Reference Figures 2 to 4 In some examples, the linkage post 21, the first boss 22, and the second boss 32 are all formed by stamping.

[0097] The use of stamping forming for the above-mentioned parts can avoid material waste and significantly improve the connection strength with the body of the first moving contact 2 or the body of the second moving contact 3, so as to ensure that the first moving contact 2 and the second moving contact 3 have high structural stability while maintaining a stable interval and stable linkage.

[0098] During frequent closing and opening of the circuit breaker, the linkage column 21 needs to transmit the action force, and the first boss 22 and the second boss 32 need to withstand the abutment force. The integral structure formed by stamping can effectively disperse stress and avoid breakage or detachment due to weak connection. At the same time, the stamping process is simple, which helps to improve production efficiency and reduce production costs.

[0099] This application also provides a circuit breaker, including a stationary contact and the aforementioned moving contact assembly 100, wherein the first moving contact 2 and the second moving contact 3 of the moving contact assembly 100 can simultaneously contact or separate from the stationary contact.

[0100] The circuit breaker of this application integrates a moving contact assembly 100 with synchronous operation and stable limit function, and with precise adaptation to the stationary contact, it not only solves the problem of switching reliability in high current scenarios, but also takes cost control into account, which is conducive to expanding the application range of the circuit breaker.

[0101] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A moving contact assembly, characterized in that, include: The contact support includes a first moving contact and a second moving contact, wherein the first moving contact and the second moving contact are rotatably connected side-by-side to the contact support. The first moving contact is provided with a linkage post and a first protrusion at intervals on the side near the second moving contact. The linkage post and the first protrusion are integrally formed with the first moving contact. The second moving contact is provided with a linkage hole adapted to the linkage post and a second protrusion opposite to the first protrusion at intervals on the side near the first moving contact. The linkage hole and the second protrusion are integrally formed with the second moving contact. The linkage post is inserted into the linkage hole, and the top surface of the first boss abuts against the top surface of the second boss.

2. The moving contact assembly according to claim 1, characterized in that, The linkage post is located at the end of the first moving contact away from the contact support, the first boss is located at the end of the first moving contact near the rotating part of the contact support, and the length of the linkage post is greater than the depth of the linkage hole.

3. The moving contact assembly according to claim 2, characterized in that, The difference between the length of the linkage column and the depth of the linkage hole is equal to the sum of the protrusion height of the first boss and the protrusion height of the second boss.

4. The moving contact assembly according to claim 3, characterized in that, The linkage column and the linkage hole adopt a transition fit or a clearance fit, and the fit clearance is less than or equal to 0.1mm.

5. The moving contact assembly according to any one of claims 1-4, characterized in that, The contact support is provided with a receiving cavity. Based on the thickness direction of the first moving contact and the second moving contact, the size of the receiving cavity is adapted to the sum of the thickness of the first moving contact, the protrusion height of the first boss, the thickness of the second moving contact, and the protrusion height of the second boss.

6. The moving contact assembly according to claim 5, characterized in that, The contact support is further provided with a rotating shaft. The rotating part of the first moving contact is provided with a first connecting hole, and the rotating part of the second moving contact is provided with a second connecting hole. The first moving contact is rotatably connected to the rotating shaft through the first connecting hole, and the second moving contact is rotatably connected to the rotating shaft through the second connecting hole. The axes of the first connecting hole and the second connecting hole are collinear.

7. The moving contact assembly according to claim 6, characterized in that, The first boss includes an integrally formed annular portion and an extension portion. The annular portion is coaxial with the first connecting hole, and the inner diameter of the annular portion is greater than or equal to the diameter of the first connecting hole. The extension portion is located on the side of the annular portion away from the linkage column. The second boss has the same shape as the first boss and is arranged symmetrically.

8. The moving contact assembly according to claim 7, characterized in that, The protrusion height of the first boss is the same as the protrusion height of the second boss.

9. The moving contact assembly according to claim 1, characterized in that, The linkage column, the first boss, and the second boss are all formed by stamping.

10. A circuit breaker, characterized in that, It includes a stationary contact and a moving contact assembly as described in any one of claims 1-9, wherein the first moving contact and the second moving contact of the moving contact assembly are capable of simultaneously contacting or separating from the stationary contact.

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