Moving contact assembly

Abstract

The invention discloses a moving contact assembly, and relates to the technical field of circuit breakers, and the moving contact assembly comprises a contact support, a moving contact, a spring seat and a contact spring. The moving contact is rotatably connected to the contact support. The moving contact comprises a mounting part. A rotating shaft hole is formed in the mounting part, a first rotating shaft is arranged in the rotating shaft hole, an arc-shaped contact surface is arranged on the side wall of the mounting part, and the arc-shaped contact surface and the rotating shaft hole are coaxially arranged. The spring seat is connected to the first rotating shaft and comprises a limiting pressing plate, and the side, close to the first rotating shaft, of the limiting pressing plate abuts against the arc-shaped contact face. The first end of the contact spring is fixedly connected to the side, away from the first rotating shaft, of the limiting pressing plate, and the second end of the contact spring is fixedly connected to the contact support. According to the moving contact assembly provided by the invention, the stress structure of the moving contact assembly can be optimized, and the mechanical stability and long-term reliability of the moving contact assembly are improved.

Description

Technical Field

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

[0002] The moving contact assembly and the stationary contact assembly are the core conductive components of a molded case circuit breaker. The reliability of the moving contact assembly directly affects the stability of the final pressure between the moving contact and the stationary contact.

[0003] Referring to the moving contact assembly disclosed in Chinese Patent CN209328820U and Chinese Patent CN218631884U, the two have similar designs: the moving contact is mounted on the support seat via a rotating shaft, and the moving contact is also provided with a riveting shaft. The spring seat is linked to the moving contact via the riveting shaft, and the contact spring is located between the spring seat and the support seat. The elastic force of the contact spring acts directly on the spring seat and is transmitted to the moving contact through the riveting shaft.

[0004] However, in the existing structure, the pressure of the contact spring is equivalent to acting directly on the riveting shaft, which has limited mechanical strength. Under long-term opening and closing operations or high-current conditions, the riveting shaft may deform due to excessive force or loosen due to thermal expansion and contraction. Ultimately, this leads to a decrease or even complete loss of contact pressure, seriously affecting the reliability and safety of the circuit breaker.

[0005] Therefore, optimizing the stress structure of the moving contact assembly and improving its mechanical stability and long-term reliability has become a pressing technical problem to be solved in this field. Summary of the Invention

[0006] The purpose of this application is to provide a moving contact assembly that optimizes the force-bearing structure of the moving contact assembly and improves its mechanical stability and long-term reliability.

[0007] This application provides a moving contact assembly, including a contact support, a moving contact, a spring seat, and a contact spring. The moving contact is rotatably connected to the contact support. The moving contact includes a mounting portion. The mounting portion has a pivot hole, in which a first pivot is disposed. The side wall of the mounting portion has an arc-shaped contact surface, which is coaxially arranged with the pivot hole. The spring seat is connected to the first pivot and includes a limiting pressure plate. The side of the limiting pressure plate near the first pivot abuts against the arc-shaped contact surface. A first end of the contact spring is fixedly connected to the side of the limiting pressure plate away from the first pivot, and a second end of the contact spring is fixedly connected to the contact support.

[0008] By setting an arc-shaped contact surface on the side wall of the mounting part and setting the limiting pressure plate to abut against the arc-shaped contact surface on the side close to the first rotating shaft, the pressure provided by the contact spring can be directly transmitted to the mounting part of the moving contact through the limiting pressure plate, instead of being transmitted to the first rotating shaft through the limiting pressure plate and then acting on the moving contact, thereby reducing the possibility of the first rotating shaft deforming due to excessive force.

[0009] Furthermore, the arc-shaped design of the arc-shaped contact surface can be coordinated with the relative rotation of the spring seat and the first rotating shaft in the rotating shaft hole, so that the spring seat can always maintain contact with the mounting part during the rotation around the rotating shaft hole. This ensures that the pressure provided by the contact spring can be accurately transmitted to the moving contact, while further reducing the possibility of deformation of the first rotating shaft due to excessive force, effectively improving the mechanical stability and long-term reliability of the moving contact assembly.

[0010] In some examples, the diameter of the pivot hole is larger than the diameter of the first pivot.

[0011] The diameter of the rotating shaft hole is larger than the diameter of the first rotating shaft. While maintaining the rotational connection, the axis of the first rotating shaft can be offset relative to the axis of the rotating shaft hole. Under long-term opening and closing operations, when the arc-shaped contact surface is worn by the limit pressure plate, the radius of the arc-shaped contact surface decreases. At this time, the first rotating shaft can be offset away from the arc-shaped contact surface based on the axis of the rotating shaft hole, so that the limit pressure plate can still accurately abut against the arc-shaped contact surface, effectively improving the structural stability of the moving contact assembly and extending its service life.

[0012] In some examples, the limiting pressure plate is configured as a flat plate structure, and the limiting pressure plate is tangent to the arc-shaped contact surface.

[0013] The flat limiting pressure plate and the arc-shaped contact surface are in tangential contact. On the one hand, this can satisfy the force transmission between the limiting pressure plate and the arc-shaped contact surface. On the other hand, the tangential contact form has low friction while maintaining contact stability, which is conducive to keeping the relative sliding between the limiting pressure plate and the arc-shaped contact surface smooth during the rotation of the spring seat.

[0014] In some examples, the spring seat further includes a first side plate and a second side plate disposed opposite to each other on both sides of the limiting pressure plate, and both the first side plate and the second side plate are provided with through holes connected to the first rotating shaft.

[0015] The spring seat is rotatably connected to the first rotating shaft through the through holes on the first and second side plates, so that the spring seat can rotate around the first rotating shaft, thereby realizing the dynamic adjustment of the contact position between the limiting pressure plate and the arc-shaped contact surface, so as to maintain effective contact between the limiting pressure plate and the arc-shaped contact surface and ensure that the pressure provided by the contact spring can be stably transmitted to the moving contact.

[0016] In some examples, the limiting pressure plate has multiple limiting bosses on the side away from the first rotating shaft, the multiple limiting bosses are spaced apart along the periphery of the limiting pressure plate, and the first end of the contact spring is engaged between the multiple limiting bosses.

[0017] Multiple limiting bosses are spaced apart along the periphery of the limiting pressure plate, forming a structure similar to a positioning groove on the limiting pressure plate. The first end of the contact spring is installed in the positioning groove formed by the multiple limiting bosses, which can reduce the possibility of the contact spring slipping off the limiting pressure plate, thereby reducing the risk of failure of the moving contact assembly.

[0018] In some examples, the contact support is provided with a fixing hole, and the second end of the contact spring is connected to the fixing hole.

[0019] By fixing the second end of the contact spring to the fixing hole on the contact support, the contact spring can be stably installed on the contact support, thereby ensuring that the contact spring can stably apply force to the moving contact between the contact support and the moving contact when the moving contact is opening and closing, so as to ensure the stability of the final pressure.

[0020] In some examples, the mounting part is further provided with a mounting hole through which a second rotating shaft passes, and the contact support is provided with a mounting groove, the end of the second rotating shaft being mounted in the mounting groove.

[0021] The mounting part is rotatably mounted on the contact support through the cooperation of the second rotating shaft and the mounting groove, so that the moving contact can rotate stably relative to the contact support. This ensures that when the contact spring applies force to the mounting part, the force applied by the contact spring can generate a stable torque on the moving contact, thus ensuring the stability of the final pressure.

[0022] In some examples, the moving contact assembly further includes a support member, which includes a fixed plate and a first support plate and a second support plate disposed opposite to each other on both sides of the fixed plate. Both the first support plate and the second support plate are provided with through holes for connection to the second rotating shaft.

[0023] The support member is rotatably connected to the second rotating shaft via through holes in the first and second support plates, providing reliable support for the rotation of the moving contact. Furthermore, this symmetrical design balances the lateral forces generated by the moving contact during opening and closing, avoiding uneven wear problems that might result from unilateral support.

[0024] In some examples, the first support plate has a first extension, the second support plate has a second extension, the first pivot is located between the first support plate and the second support plate, the first extension corresponds to blocking a first end of the first pivot, and the second extension corresponds to blocking a second end of the first pivot.

[0025] The first extension and the second extension can form a complete axial constraint structure, which can effectively prevent the first shaft from axially moving during operation, thereby reducing the risk of the first shaft coming out of the shaft hole, ensuring that the spring seat is stably installed on the mounting part, and improving the structural stability of the moving contact assembly.

[0026] In some examples, both ends of the contact spring are provided with abutment planes.

[0027] By providing abutment planes at both ends of the contact spring, the first end of the contact spring abuts against the limiting pressure plate with a plane, and the second end of the contact spring abuts against the wall of the fixing hole with a plane. This increases the contact area, ensures that the force provided by the contact spring is transmitted evenly, avoids off-center loading, and improves the accuracy of the moving contact assembly. Attached Figure Description

[0028] 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.

[0029] Figure 1 This is a schematic diagram of the overall structure of the moving contact assembly provided in the embodiments of this application.

[0030] Figure 2 One of the exploded views of the moving contact assembly provided in the embodiments of this application.

[0031] Figure 3 The second exploded view of the moving contact assembly provided in the embodiments of this application.

[0032] Figure 4 This is a bottom view of the moving contact assembly provided in an embodiment of this application.

[0033] Figure 5 Provided for the embodiments of this application Figure 4 Sectional view at point AA.

[0034] Figure 6 Provided for the embodiments of this application Figure 5 A schematic diagram showing the fit between the middle spring seat and the mounting part after relative rotation.

[0035] Figure 7 This is a schematic diagram showing the engagement of the spring seat and the moving contact after the arc-shaped contact surface has worn down, as provided in an embodiment of this application.

[0036] Figure 8 This is a schematic diagram of the structure of the spring seat and the moving contact after assembly, as provided in an embodiment of this application.

[0037] Figure 9 This is a schematic diagram of the installation structure between the contact spring and the spring seat provided in an embodiment of this application.

[0038] Figure 10 This is a schematic diagram of the structure of the spring seat provided in an embodiment of this application.

[0039] Figure 11 This is a schematic diagram of the structure after the support member and the moving contact are assembled, as provided in the embodiments of this application.

[0040] Explanation of reference numerals in the attached drawings: 100, contact assembly; 1, contact support; 11, mounting cavity; 12, fixing hole; 13, mounting groove; 2, moving contact; 21, mounting part; 211, pivot hole; 212, first pivot; 213, arc-shaped contact surface; 214, mounting hole; 215, second pivot; 22, contact part; 3, spring seat; 31, limiting pressure plate; 32, first side plate; 33, second side plate; 34, through hole; 35, limiting boss; 4, contact spring; 41, abutting plane; 5, support member; 51, fixing plate; 52, first support plate; 521, first extension; 53, second support plate; 531, second extension; 54, through hole. Detailed Implementation

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] The moving contact assembly is a key component in a molded case circuit breaker that works in conjunction with the stationary contact assembly to connect and disconnect the circuit. The contact spring in the moving contact assembly maintains a constant contact pressure between the moving and stationary contacts, thereby ensuring the stability and reliability of the electrical connection.

[0047] In existing molded case circuit breaker products, the pressure provided by the contact spring acts directly on the riveting shaft riveted to the moving contact through the spring seat. However, under long-term opening and closing operations or high current conditions, the riveting shaft may deform due to excessive force or loosen due to thermal expansion and contraction. Once the riveting shaft deforms or loosens, the pressure of the contact spring will further exacerbate its failure, eventually leading to a drop in the final contact pressure or even complete loss, seriously affecting the reliability and safety of the circuit breaker.

[0048] Based on this, embodiments of this application provide a moving contact assembly that can optimize the force-bearing structure of the moving contact assembly and improve its mechanical stability and long-term reliability.

[0049] 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.

[0050] Reference Figures 1 to 3This embodiment provides a moving contact assembly 100, including a contact support 1, a moving contact 2, a spring seat 3, and a contact spring 4. The moving contact 2 is rotatably connected to the contact support 1. The moving contact 2 includes a mounting portion 21. The mounting portion 21 has a pivot hole 211, in which a first pivot 212 is provided. The side wall of the mounting portion 21 has an arc-shaped contact surface 213, which is coaxially arranged with the pivot hole 211. The spring seat 3 is connected to the first pivot 212 and includes a limiting pressure plate 31. The side of the limiting pressure plate 31 near the first pivot 212 abuts against the arc-shaped contact surface 213. The first end of the contact spring 4 is fixedly connected to the side of the limiting pressure plate 31 away from the first pivot 212, and the second end of the contact spring 4 is fixedly connected to the contact support 1.

[0051] By providing an arc-shaped contact surface 213 on the side wall of the mounting part 21 and setting the limiting pressure plate 31 to abut against the arc-shaped contact surface 213 on the side close to the first rotating shaft 212, the pressure provided by the contact spring 4 can be directly transmitted to the mounting part 21 of the moving contact 2 through the limiting pressure plate 31, instead of being transmitted to the first rotating shaft 212 and then acting on the moving contact 2 through the limiting pressure plate 31, thereby reducing the possibility of the first rotating shaft 212 deforming due to excessive force.

[0052] Furthermore, the arc-shaped design of the arc-shaped contact surface 213 can cooperate with the relative rotation of the spring seat 3 and the first rotating shaft 212 in the rotating shaft hole 211, so that the spring seat 3 can always maintain contact with the mounting part 21 during the rotation around the rotating shaft hole 211. This ensures that the pressure provided by the contact spring 4 can be accurately transmitted to the moving contact 2, while further reducing the possibility of deformation of the first rotating shaft 212 due to excessive force, effectively improving the mechanical stability and long-term reliability of the moving contact assembly 100.

[0053] Among them, reference Figures 1 to 2 The contact support 1 is used to install the moving contact 2. The contact support 1 typically has a mounting cavity 11, and the moving contact 2 is rotatably connected within the mounting cavity 11. In this embodiment, a three-phase molded case circuit breaker is used as an example. The contact support 1 has three mounting cavities 11 arranged in parallel, and each mounting cavity 11 independently installs one moving contact 2. The three moving contacts 2 can cooperate with the three corresponding stationary contacts in the molded case circuit breaker to control the on / off state of the three-phase circuit. Of course, the moving contact assembly 100 in this embodiment can also be applied to single-phase, two-phase, or four-phase molded case circuit breakers; this embodiment does not make specific limitations.

[0054] Reference Figures 1 to 3 The moving contact 2 includes a mounting part 21 for mounting the moving contact 2. The moving contact 2 also includes a contact part 22 for contacting the stationary contact to close the circuit. The contact part 22 and the mounting part 21 are located at opposite ends of the moving contact 2.

[0055] The pivot hole 211 is provided on the moving contact 2 in the form of a through hole. The first pivot 212 passes through the pivot hole 211. The first pivot 212 and the pivot hole 211 can be in the form of a transition fit or a clearance fit so that the first pivot 212 can be movably installed in the pivot hole 211. The specific form of movement will be explained later and will not be explained here.

[0056] Reference Figures 4 to 5 The spring seat 3 is rotatably connected to the mounting part 21 via the first rotating shaft 212. At the same time, the limiting pressure plate 31 on the spring seat 3 abuts against the arc-shaped contact surface 213 on the side wall of the mounting part 21. When the spring seat 3 is subjected to the force applied by the contact spring 4, the spring seat 3 can transmit the force to the mounting part 21 through the contact between the limiting pressure plate 31 and the arc-shaped contact surface 213, so that the moving contact 2 can rotate relative to the contact support 1, thereby allowing the moving contact 2 to rotate to the position of contacting the stationary contact. Under the continuous force of the contact spring 4, the stability of the final pressure between the moving contact 2 and the stationary contact can be ensured.

[0057] Furthermore, the axis of the arc-shaped contact surface 213 coincides with the axis of the rotating shaft hole 211. Since the moving contact 2 will also rotate relative to the spring seat 3 during the rotation process, the setting of the arc-shaped contact surface 213 can ensure that the limiting pressure plate 31 can always abut against the arc-shaped contact surface 213 on the rotation path during the rotation of the spring seat 3 relative to the moving contact 2, so as to maintain stable contact and form a stable force transmission path, thereby enabling the moving contact 2 to maintain contact and conduction with the stationary contact under the continuous force of the contact spring 4.

[0058] Specifically, the mounting section 21 includes an extension section, such as... Figure 3 As shown, the extension direction of the extension section is set at a certain angle to the direction from the mounting part 21 to the contact part 22. The arc-shaped contact surface 213 is provided on the side wall of the extension section, and the pivot hole 211 is also opened on the extension section. The arc-shaped contact surface 213 and the pivot hole 211 are designed to be coaxial so that when the limiting pressure plate 31 is pressed by the contact spring 4 and slides relative to it along the arc-shaped contact surface 213, the rotation center of the spring seat 3 is always within the mounting hole 214. This can prevent the spring seat 3 from being damaged due to force imbalance, thereby ensuring the stability of the moving contact assembly 100.

[0059] One end of the contact spring 4 is connected to the limiting pressure plate 31, and the other end is fixed to the contact support 1, forming a stable force closed loop. This arrangement ensures that the force provided by the contact spring 4 can be effectively transmitted along the force transmission path of the contact support 1, the limiting pressure plate 31, and the mounting part 21.

[0060] Reference Figures 5 to 7 In some examples, the diameter of the pivot hole 211 is larger than the diameter of the first pivot 212.

[0061] The diameter of the rotating shaft hole 211 is larger than the diameter of the first rotating shaft 212. This allows the axis of the first rotating shaft 212 to offset relative to the axis of the rotating shaft hole 211 while maintaining a rotational connection. Under long-term opening and closing operations, refer to... Figure 6 and Figure 7 When the arc-shaped contact surface 213 is worn by the limiting pressure plate 31, the radius of the arc-shaped contact surface 213 decreases. At this time, the first rotating shaft 212 can be offset away from the arc-shaped contact surface 213 based on the axis of the rotating shaft hole 211, so that the limiting pressure plate 31 can still accurately abut against the arc-shaped contact surface 213, effectively improving the structural stability of the moving contact assembly 100 and extending its service life.

[0062] Reference Figures 4 to 6 The pivot hole 211 and the first pivot 212 are designed with clearance fit or transition fit, that is, the diameter of the pivot hole 211 is slightly larger than the diameter of the first pivot 212. This fit allows the spring seat 3 and the mounting part 21 to have an adaptive adjustment function.

[0063] Specifically, after the moving contact 2 has undergone long-term opening and closing operations, the arc-shaped contact surface 213 will inevitably experience a certain degree of wear under the friction of the limiting pressure plate 31, resulting in a gradual decrease in the radius of curvature of the arc-shaped contact surface 213. At this time, the first rotating shaft 212 can produce a slight positional offset within the allowable range of the rotating shaft hole 211, and the offset direction is always towards the direction away from the wear surface, thereby ensuring that the limiting pressure plate 31 and the arc-shaped contact surface 213 always maintain the best contact state, avoiding the situation where the pressure of the contact spring 4 directly acts on the first rotating shaft 212 after the arc-shaped contact surface 213 wears, effectively reducing the risk of deformation of the first rotating shaft 212 due to force, and improving the structural stability of the contact assembly 100.

[0064] This adaptive adjustment function can compensate for dimensional changes caused by mechanical wear, thus maintaining a stable contact pressure transmission path. It also reduces the problem of localized stress concentration due to wear, resulting in a more uniform force distribution. Furthermore, by allowing minute displacement of the first rotating shaft 212, the assembly precision requirements of the mating surfaces can be reduced, improving the product's process tolerance.

[0065] In actual working conditions, refer to Figures 5 to 10After the first rotating shaft 212 and the spring seat 3 are assembled, under the pressure applied by the contact spring 4, the limiting pressure plate 31 near the first rotating shaft 212 abuts against the arc-shaped contact surface 213. By adjusting the distance between the limiting pressure plate 31 and the first rotating shaft 212, the first rotating shaft 212 can be located in the mounting hole 214 on the side tangent to the rotating shaft hole 211 near the arc-shaped contact surface 213, or the first rotating shaft 212 can be located at a position where the axis of the first rotating shaft 212 coincides with the axis of the rotating shaft hole 211, or it can be located at any position between the two positions mentioned above, as long as the condition that the first rotating shaft 212 can be offset away from the arc-shaped contact surface 213 in the rotating shaft hole 211 is met.

[0066] This design ensures structural stability while maintaining reliable force transmission between the spring seat 3 and the moving contact 2 without manual intervention. Compared to the traditional method where the first rotating shaft 212 is riveted to the mounting part 21 and cooperates with the spring seat 3, this embodiment significantly extends the service life of the moving contact assembly 100 while reducing performance degradation caused by wear accumulation.

[0067] Furthermore, this design offers ease of maintenance. This adaptive adjustment function requires virtually no wear adjustment during normal service life, significantly reducing maintenance frequency and costs. This feature makes it suitable for high-frequency operating applications requiring long-term reliable operation, providing strong assurance for the overall performance of the circuit breaker.

[0068] Reference Figures 5 to 10 In some examples, the limiting pressure plate 31 is configured as a flat plate structure, and the limiting pressure plate 31 is tangent to the arc-shaped contact surface 213.

[0069] The flat limiting pressure plate 31 and the arc-shaped contact surface 213 are in tangential contact. On the one hand, this satisfies the force transmission between the limiting pressure plate 31 and the arc-shaped contact surface 213. On the other hand, the tangential contact form has a small frictional force while maintaining contact stability, which is conducive to keeping the relative sliding of the limiting pressure plate 31 and the arc-shaped contact surface 213 smooth during the rotation of the spring seat 3.

[0070] The limiting pressure plate 31 is designed as a flat plate. The flat plate limiting pressure plate 31 is tangent to the arc-shaped contact surface 213, that is, it maintains a line-to-line contact. During the rotation of the spring seat 3 around the first rotating shaft 212, the limiting pressure plate 31 and the arc-shaped contact surface 213 slide relative to each other. The relative sliding of the line contact between the two has a small contact area, so it has a small frictional resistance, which can ensure that the relative sliding process is smooth and stable.

[0071] In an alternative embodiment, the side of the limiting pressure plate 31 near the first rotating shaft 212 can be designed as an arc-shaped surface, while the arc-shaped contact surface 213 on the side wall of the mounting part 21 can be changed to a plane. This design can also satisfy the line-to-line contact between the limiting pressure plate 31 and the mounting part 21, and can ensure the stability of force transmission between the limiting pressure plate 31 and the mounting part 21 while reducing sliding friction.

[0072] Reference Figures 8 to 10 In some examples, the spring seat 3 further includes a first side plate 32 and a second side plate 33 disposed opposite to each other on both sides of the limiting pressure plate 31, and both the first side plate 32 and the second side plate 33 are provided with through holes 34 connected to the first rotating shaft 212.

[0073] The spring seat 3 is rotatably connected to the first rotating shaft 212 through the through holes 34 on the first side plate 32 and the second side plate 33, so that the spring seat 3 can rotate around the first rotating shaft 212, thereby realizing the dynamic adjustment of the contact position between the limiting pressure plate 31 and the arc-shaped contact surface 213, so as to maintain the effective contact between the limiting pressure plate 31 and the arc-shaped contact surface 213, and ensure that the pressure provided by the contact spring 4 can be stably transmitted to the moving contact 2.

[0074] In this spring seat 3, the limiting pressure plate 31, the first side plate 32, and the second side plate 33 are integrally formed. The first side plate 32 and the second side plate 33 are both perpendicular to the limiting pressure plate 31 and are arranged opposite each other on both sides of the limiting pressure plate 31 to form a stable U-shaped frame structure. The first side plate 32 and the second side plate 33 both extend to the side of the limiting pressure plate 31 near the first rotating shaft 212. The first side plate 32 and the second side plate 33 are both connected to the first rotating shaft 212 so that the side of the limiting pressure plate 31 near the first rotating shaft 212 can stably abut against the arc-shaped contact surface 213.

[0075] Reference Figure 10 The first side plate 32 and the second side plate 33 have the same structure and are symmetrically arranged on both sides of the limiting pressure plate 31. The through holes 34 opened on the first side plate 32 and the second side plate 33 are also located on the same axis. This design can provide balanced support force when the moving contact 2 performs opening and closing operations, so that the limiting pressure plate 31 always remains tangent to the arc-shaped contact surface 213 during the rotation around the first rotating shaft 212, avoiding abnormal wear caused by uneven force.

[0076] Furthermore, the diameter of the through hole 34 is matched with the diameter of the first rotating shaft 212. Specifically, only a small gap is designed between the first rotating shaft 212 and the through hole 34, ensuring a stable rotational connection while facilitating assembly. Alternatively, an interference fit can be used, which helps reduce the swaying of the limiting pressure plate 31 during movement and improves the overall structural stability.

[0077] In an alternative embodiment, the diameter of the through hole 34 can be designed to be slightly larger than the diameter of the first rotating shaft 212. This allows for a slight offset between the first rotating shaft 212 and the spring seat 3, which can also compensate for the offset of the spring seat 3 after wear occurs on the arc-shaped contact surface 213, so that the limiting pressure plate 31 can maintain stable contact with the arc-shaped contact surface 213.

[0078] Reference Figures 9 to 10 In some examples, the limiting pressure plate 31 is provided with a plurality of limiting protrusions 35 on the side away from the first rotating shaft 212. The plurality of limiting protrusions 35 are spaced apart along the periphery of the limiting pressure plate 31, and the first end of the contact spring 4 is engaged between the plurality of limiting protrusions 35.

[0079] Multiple limiting bosses 35 are spaced apart along the periphery of the limiting pressure plate 31, and can form a structure similar to a positioning groove on the limiting pressure plate 31. The first end of the contact spring 4 is installed in the positioning groove formed by the multiple limiting bosses 35, which can reduce the possibility of the contact spring 4 slipping off the limiting pressure plate 31, thereby reducing the risk of failure of the moving contact assembly 100.

[0080] Specifically, refer to Figure 9 The limiting bosses 35 are disposed on the periphery of the limiting pressure plate 31, and the protrusion direction of the limiting bosses 35 is opposite to the extension direction of the first side plate 32 and the second side plate 33. The limiting pressure plate 31 is a rectangular plate, and in this embodiment, a total of 6 limiting bosses 35 are provided. The 6 limiting bosses 35 surround the limiting pressure plate 31 in four directions to form a positioning groove for installing the first end of the contact spring 4. The first end of the contact spring 4 is constrained in the positioning groove, which effectively prevents the radial displacement of the first end of the contact spring 4, thereby reducing the risk of the contact spring 4 detaching from the limiting pressure plate 31.

[0081] Compared to setting a cylindrical protrusion that can be inserted into the contact spring 4, using multiple limiting protrusions 35 to form a positioning groove can prevent the flat structure of the limiting pressure plate 31 from deforming, so that the side of the limiting pressure plate 31 near the first rotating shaft 212 can remain tangent to the arc-shaped contact surface 213, ensuring the stability of pressure transmission.

[0082] In addition, the positioning groove formed by multiple limiting bosses 35 not only retains the necessary assembly space, but also provides sufficient limiting protection. It can prevent the contact spring 4 from disengaging from the limiting pressure plate 31, while facilitating the adjustment of the contact angle and contact position of the contact spring 4 during the rotation of the spring seat 3, so as to accurately apply force to the spring seat 3.

[0083] In terms of manufacturing process, the limiting boss 35 and the limiting pressure plate 31 are integrally formed, which not only ensures structural strength but also simplifies the assembly process.

[0084] Reference Figure 2 In some examples, the contact support 1 is provided with a fixing hole 12, and the second end of the contact spring 4 is connected to the fixing hole 12.

[0085] By fixing the second end of the contact spring 4 to the fixing hole 12 on the contact support 1, the contact spring 4 can be stably installed on the contact support 1, thereby ensuring that the contact spring 4 can stably apply force to the moving contact 2 between the contact support 1 and the moving contact 2 when the moving contact 2 is opening and closing, so as to ensure the stability of the final pressure.

[0086] The fixing hole 12 is opened in the mounting cavity 11 of the contact support 1. The depth of the fixing hole 12 can be designed to be one-third to one-half of the length of the contact spring 4. This can provide a stable support base for the contact spring 4, reduce the possibility of the contact spring 4 loosening, and ensure the reliability of the pressure transmission of the contact spring 4.

[0087] In addition, the inner wall of the fixing hole 12 can be designed to fit tightly with the contact spring 4, or a cylindrical protrusion that can be inserted into the axis of the contact spring 4 can be provided in the fixing hole 12. Both of these design forms can effectively prevent the contact spring 4 from radially shifting during operation.

[0088] Reference Figure 2 and Figure 3 In some examples, the mounting part 21 is further provided with a mounting hole 214, in which a second rotating shaft 215 passes through, and the contact support 1 is provided with a mounting groove 13, the end of the second rotating shaft 215 being mounted in the mounting groove 13.

[0089] The mounting part 21 is rotatably mounted on the contact support 1 through the cooperation of the second rotating shaft 215 and the mounting groove 13, so that the moving contact 2 can rotate stably relative to the contact support 1. In order to ensure that when the contact spring 4 applies force to the mounting part 21, the force applied by the contact spring 4 can generate a stable torque on the moving contact 2, so as to ensure the stability of the final pressure.

[0090] Reference Figure 2 and Figure 3 Mounting holes 214 and pivot holes 211 are spaced apart on the mounting portion 21. A second pivot 215 in the mounting hole 214 is used for a rotatable connection between the moving contact 2 and the contact support 1. Specifically, the mounting hole 214 is provided transversely through the mounting portion 21, and the second pivot 215 passes through it. Both ends of the second pivot 215 can be correspondingly engaged in the mounting groove 13 to achieve a rotatable connection between the moving contact 2 and the contact support 1. The force transmitted from the contact spring 4 to the mounting portion 21 of the moving contact 2 via the spring seat 3 enables the moving contact 2 to rotate accurately around the second pivot 215, allowing the moving contact 2 to rotate to the contact position with the stationary contact and maintain a stable final pressure.

[0091] In addition, the second rotating shaft 215 and the mounting hole 214 maintain a small clearance fit, which ensures the flexibility of rotation and avoids the impact of excessive clearance on the motion accuracy.

[0092] In another embodiment, the second rotating shaft 215 can be designed as a convex shaft integrally provided on the mounting part 21, and the moving contact 2 can be rotatably connected to the mounting groove 13 through the convex shaft, thus realizing the rotatable connection between the moving contact 2 and the contact support 1.

[0093] Reference Figure 9 and Figure 11 In some examples, the moving contact assembly 100 further includes a support member 5, which includes a fixing plate 51 and a first support plate 52 and a second support plate 53 disposed opposite to each other on both sides of the fixing plate 51. Both the first support plate 52 and the second support plate 53 are provided with through holes 54 connected to the second rotating shaft 215.

[0094] The support member 5 is rotatably connected to the second rotating shaft 215 through the through holes 54 on the first support plate 52 and the second support plate 53, which can provide reliable support for the rotation of the moving contact 2. Furthermore, this symmetrical design can balance the lateral force generated by the moving contact 2 during the opening and closing process, avoiding the problem of uneven wear that may be caused by unilateral support.

[0095] The fixing plate 51 of the support member 5 is used to fix the moving contact assembly 100 to the base of the molded case circuit breaker. The first support plate 52 and the second support plate 53 are used to support the moving contact assembly 100.

[0096] Specifically, the first support plate 52 and the second support plate 53 are arranged opposite each other on both sides of the fixed plate 51, forming a stable U-shaped support frame. This U-shaped support frame supports the moving contact assembly 100 from two points, providing stable support for the moving contact assembly 100 and reducing the possibility of uneven wear of the moving contact 2 due to uneven force during the opening and closing operation. At the same time, the overall rigid structure of the support member 5 can better resist the impact of the electric repulsion force, ensuring that the moving contact 2 can maintain a stable contact pressure when a short-circuit current passes through.

[0097] In addition, a small clearance is maintained between the through hole 54 and the second rotating shaft 215, which ensures the flexibility of rotation and avoids excessive clearance from affecting the motion accuracy.

[0098] Reference Figure 9 and Figure 11In some examples, the first support plate 52 is provided with a first extension 521, the second support plate 53 is provided with a second extension 531, the first rotating shaft 212 is located between the first support plate 52 and the second support plate 53, the first extension 521 is provided to block the first end of the first rotating shaft 212, and the second extension 531 is provided to block the second end of the first rotating shaft 212.

[0099] The arrangement of the first extension 521 and the second extension 531 can form a complete axial constraint structure, which can effectively prevent the first rotating shaft 212 from axially moving during operation, thereby reducing the risk of the first rotating shaft 212 coming out of the rotating shaft hole 211, ensuring that the spring seat 3 is stably installed on the mounting part 21, and improving the structural stability of the moving contact assembly 100.

[0100] Reference Figure 9 and Figure 11 The first extension 521 is integrally formed with the first support plate 52, and the second extension 531 is integrally formed with the second support plate 53, which ensures structural strength and simplifies the manufacturing process. Specifically, the first extension 521 is located on the side of the first support plate 52, and the second extension 531 is located on the side of the second support plate 53. The extension directions of the first extension 521 and the second extension 531 are the same, and they are symmetrical to each other.

[0101] The U-shaped support 5 is rotatably connected to the second rotating shaft 215. The mounting part 21 of the moving contact 2 is accommodated within the U-shaped range of the U-shaped support 5, which facilitates assembly and also provides a certain degree of protection for the mounting part 21, reducing the risk of the contact spring 4 failing to transmit force due to the mounting part 21 being affected.

[0102] The first rotating shaft 212 is mounted on the mounting part 21. The axis of the first rotating shaft 212 is perpendicular to the first support plate 52 and the second support plate 53. The length of the first rotating shaft 212 is less than the distance between the first support plate 52 and the second support plate 53, so that the axial position of the first rotating shaft 212 is restricted between the first support plate 52 and the second support plate 53, thereby preventing the first rotating shaft 212 from disengaging from the rotating shaft hole 211 along the axial direction, which is beneficial to maintaining the assembly stability of the moving contact assembly 100.

[0103] During the rotation of the moving contact 2 around the second rotating shaft 215, the mounting part 21 also rotates around the second rotating shaft 215. The first rotating shaft 212 then has an arc-shaped movement path around the second rotating shaft 215. The first extension 521 and the second extension 531 are provided to adapt to the arc-shaped movement path of the first rotating shaft 212, so that the first rotating shaft 212 remains within the axial limiting space formed by the first support plate 52 and the second support plate 53 during the rotation around the second rotating shaft 215, ensuring that the first rotating shaft 212 will not come out of the rotating shaft hole 211 axially, which significantly improves the structural stability and operational reliability of the moving contact assembly 100.

[0104] Reference Figure 3 In some examples, both ends of the contact spring 4 are provided with abutment planes 41.

[0105] By providing abutment planes 41 at both ends of the contact spring 4, the first end of the contact spring 4 can abut against the limiting pressure plate 31 with a plane, and the second end of the contact spring 4 can abut against the wall of the fixing hole 12 with a plane. This can increase the contact area, ensure that the force provided by the contact spring 4 is transmitted evenly, avoid uneven load, and improve the operation accuracy of the moving contact assembly 100.

[0106] In one optional embodiment, the end of the contact spring 4 is machined into an abutment plane 41 by means of machining such as cutting. The specific machining accuracy can be controlled within ±0.05mm, and the surface roughness Ra≤1.6μm. Furthermore, the contact area between the first abutment plane 41 and the limiting pressure plate 31 is not less than three times the cross-sectional area of ​​the steel wire of the contact spring 4, and the contact length between the second abutment plane 41 and the fixing hole 12 is not less than 1 / 2 of the spring diameter. This precise fit ensures that the connection of the contact spring 4 can still maintain reliable mechanical properties under high current impact conditions.

[0107] 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 by, The utility model relates to a contact spring assembly, comprising: a contact support; a movable contact rotatably connected to the contact support, the movable contact comprising a mounting portion provided with a rotating shaft hole, the rotating shaft hole being provided with a first rotating shaft, a side wall of the mounting portion being provided with an arc-shaped contact surface coaxially arranged with the rotating shaft hole; a spring seat connected to the first rotating shaft, the spring seat comprising a limiting pressing plate, one side of the limiting pressing plate close to the first rotating shaft abutting against the arc-shaped contact surface; a contact spring, a first end of the contact spring being fixedly connected to one side of the limiting pressing plate away from the first rotating shaft, a second end of the contact spring being fixedly connected to the contact support.

2. The movable contact assembly of claim 1, wherein, The diameter of the rotating shaft hole is greater than the diameter of the first rotating shaft.

3. The movable contact assembly of claim 1, wherein, The limiting pressing plate is configured in a flat plate structure, and the limiting pressing plate is tangent to the arc-shaped contact surface.

4. The movable contact assembly of claim 3, wherein, The spring seat further comprises a first side plate and a second side plate oppositely arranged on both sides of the limiting pressing plate, and the first side plate and the second side plate are both provided with a through hole connected to the first rotating shaft.

5. The movable contact assembly of claim 3, wherein, One side of the limiting pressing plate away from the first rotating shaft is provided with a plurality of limiting bosses, the plurality of limiting bosses being arranged at intervals along the circumferential side of the limiting pressing plate, and the first end of the contact spring is clamped between the plurality of limiting bosses.

6. The movable contact assembly of any of claims 1-5, wherein, The contact support is provided with a fixing hole, and the second end of the contact spring is connected to the fixing hole.

7. The movable contact assembly of any of claims 1-5, wherein, The mounting portion is further provided with a mounting hole, the mounting hole being provided with a second rotating shaft, and the contact support is provided with a mounting groove, an end portion of the second rotating shaft being mounted in the mounting groove.

8. The movable contact assembly of claim 7, wherein, The movable contact assembly further comprises a support, the support comprising a fixed plate and a first support plate and a second support plate oppositely arranged on both sides of the fixed plate, the first support plate and the second support plate being both provided with a through hole connected to the second rotating shaft.

9. The movable contact assembly of claim 8, wherein, The first support plate is provided with a first extension portion, the second support plate is provided with a second extension portion, the first rotating shaft is located between the first support plate and the second support plate, the first extension portion corresponds to block the first end of the first rotating shaft, and the second extension portion corresponds to block the second end of the first rotating shaft.

10. The movable contact assembly of claim 1, wherein, Both ends of the contact spring are provided with abutting planes.

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