A moving contact device for a circuit breaker
By designing the moving contact support as an elongated sheet structure and cooperating with the moving contact spring, the problems of plastic shrinkage and processing difficulty of existing circuit breaker moving contact supports were solved, thereby improving the stability and reliability of the circuit breaker.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG RUITAN DIGITAL ENERGY CO LTD
- Filing Date
- 2025-07-15
- Publication Date
- 2026-07-31
AI Technical Summary
The existing moving contact support structure of circuit breakers has problems such as plastic shrinkage, thermal expansion and contraction, insufficient mechanical strength, and high processing difficulty, which affect the reliability and performance stability of circuit breakers.
The moving contact support adopts a long, sheet-like structure, combined with a moving contact spring design. The moving contact is driven to contact and separate from the stationary contact through the circuit breaker operating mechanism. The elastic force of the moving contact spring ensures the stability and reliability of the contact. The moving contact support adopts a flat sheet metal structure to simplify the processing technology.
It improves the mechanical structure consistency and stability of circuit breakers, reduces processing difficulty and cost, enhances contact overtravel and opening distance control, and improves the performance and reliability of circuit breakers.
Smart Images
Figure CN224582235U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of low-voltage electrical appliances, specifically to a moving contact device for a circuit breaker. Background Technology
[0002] Most existing circuit breaker moving contact supports are made of plastic or U-shaped sheet metal. Both structures have drawbacks in practical applications, significantly impacting product performance and stability. Plastic contact supports, due to factors such as plastic shrinkage, thermal expansion and contraction, poor temperature resistance, and low mechanical strength, subject the circuit breaker to significant electro-mechanical impacts and mechanical stresses during opening and closing, severely affecting reliability and performance stability, and even causing failure. U-shaped sheet metal supports place high demands on molds and processing equipment, making it difficult to control coaxiality during processing. They are also prone to deformation during transportation and processing, leading to tilting and affecting the smoothness of the operating mechanism's movements, even impacting opening and closing speeds and mechanical lifespan, severely affecting product performance. Utility Model Content
[0003] Based on the above background, in order to solve at least one of the above problems, this utility model provides a moving contact device for a circuit breaker that can improve the consistency and stability of the mechanical structure of the circuit breaker and overcome the above problems.
[0004] This utility model provides a moving contact device for a circuit breaker, comprising at least a moving contact bracket, a moving contact, a moving contact spring, and a shaft. The moving contact bracket is an elongated sheet structure, with a driven part at one end and a moving contact mounting part at the other end, and a rotation fulcrum between the two ends. The moving contact is rotatably mounted on the moving contact mounting part via the shaft. The moving contact spring is a torsion spring sleeved on the shaft. The moving contact spring includes a first arm and a second arm. The first arm is fixedly mounted on the moving contact bracket, and the second arm presses against the moving contact to elastically fix the moving contact on the moving contact bracket. The operating mechanism of the circuit breaker drives the moving contact device to rotate, causing the moving contact to press against the stationary contact of the circuit breaker. The elastic force generated by the compression of the moving contact spring is applied to the stationary contact through the moving contact.
[0005] In this way, by using a sheet-like structure design for the moving contact bracket and assembling single or multiple pieces of the moving contact bracket, the structure of the moving contact bracket is simplified, and the processing requirements and equipment complexity are reduced. Simultaneously, through the cooperation of the moving contact bracket with the moving contact and the moving contact spring structure, the circuit breaker operating mechanism drives the moving contact device to rotate, enabling the moving contact to make electrical contact and separate from the stationary contact. The pressure generated by the contact between the moving and stationary contacts forces the moving contact to rotate a certain angle away from the stationary contact, ensuring contact overtravel and contact pressure when the circuit breaker is closed. After the moving contact separates from the stationary contact, the moving contact spring elastically presses the moving contact against the stop part, reducing the jitter and rebound of the moving contact during the disconnection process, ensuring the opening distance between the moving and stationary contacts after the circuit breaker is disconnected, and improving the stability and reliability of the circuit breaker.
[0006] In some embodiments, the moving contact support includes a stop for limiting the rotation amplitude of the moving contact, the stop being disposed on the path of the moving contact rotating toward the stationary contact.
[0007] In the above embodiments, the moving contact bracket is provided with a stop portion, which is a limiting boss formed by stamping the moving contact bracket. The limiting bosses are respectively staggered and arranged on both sides of the moving contact bracket in the thickness direction. The stop portion can also be the bent edge of the Z-shaped bending plate of the moving contact bracket located in the moving contact mounting part. The stop portion is the bent edge of the bending feature of a single moving contact bracket or a double symmetrical moving contact bracket. The stop portion can also be a limiting member riveted or welded to the moving contact bracket. The limiting boss, the bent edge, and the limiting member are all arranged on the path of the moving contact rotating towards the stationary contact to limit the initial position and rotation direction of the moving contact, ensure contact overtravel when the circuit breaker is closed and contact opening distance after opening, and improve the consistency of contact parameters.
[0008] In some embodiments, the moving contact support is a single flat plate structure, the moving contact mounting part is provided with a first rotating hole, the stop part is a limiting boss arranged around the first rotating hole, and the moving contact abuts against the limiting boss by a moving contact spring.
[0009] In the above embodiments, the moving contact support is a sheet-like flat structure formed by stamping one or more stacked sheet metal pieces. The moving contact support is elongated and has a rotation fulcrum at its center. Around the rotation fulcrum, the moving contact support has a driven part and a moving contact mounting part at both ends. One end of the driven part has a second rotation hole for connection to the operating mechanism. The moving contact mounting part has a first rotation hole for connection to the moving contact. The moving contact spring is sleeved on a rotating shaft hinged to the moving contact and the first rotation hole. The moving contact spring abuts against the moving contact support and the moving contact, and the moving contact abuts against a limiting boss via the moving contact spring. The sheet-like design of the moving contact support reduces processing technology and equipment requirements, improves part dimensional stability, and enhances component quality.
[0010] In some embodiments, the moving contact bracket is a single-piece bent structure, the moving contact mounting part is a Z-shaped bent plate, the Z-shaped bent plate is provided with a first rotating hole, the stop part is the bent edge of the Z-shaped bent plate, and the moving contact abuts against the bent edge by a moving contact spring.
[0011] In the above embodiment, the moving contact bracket is a Z-shaped sheet metal stamping structure. The moving contact bracket is elongated and has a rotation fulcrum in the middle. The moving contact bracket has a driven part and a moving contact mounting part at both ends around the rotation fulcrum. The moving contact mounting part is a Z-shaped bent plate with a first rotation hole. The Z-shaped bend is located between the rotation fulcrum and the first rotation hole. The stop part is the bent edge of the Z-shaped bend. The moving contact is hinged to the first rotation hole of the moving contact bracket through the rotation hole. The sheet-like design of the moving contact bracket and the setting of the bent edge restrict the initial position and rotation direction of the moving contact. While achieving the above-mentioned purpose of improving the quality of the parts, it can be matched with moving contacts of different structures, making the application more flexible.
[0012] In some embodiments, the moving contact bracket is a symmetrically arranged double sheet metal bracket, and the moving contact mounting part of each sheet metal bracket is a Z-shaped bent plate. The Z-shaped bent plates on both sides are bent in a direction away from each other to form a U-shaped groove. The Z-shaped bent plate is provided with a first rotating hole, and the stop part is the bent edge of the Z-shaped bent plate.
[0013] In the above embodiments, the moving contact bracket is a double-arm structure, consisting of two symmetrically arranged sheet metal brackets. The moving contact brackets are a combined structure symmetrically assembled and fixed by riveting or welding. The moving contact mounting part of each sheet metal bracket is a Z-shaped bent plate. The moving contact mounting parts of the two sheet metal brackets are bent in a direction away from each other. Each sheet metal bracket has a second rotating hole on its Z-shaped bent plate. After assembly, two adjacent sheet metal brackets form a U-shaped groove by the Z-shaped bent plate. The first rotating holes on the two moving contact mounting parts are coaxial holes of equal diameter penetrating the U-shaped groove. The stop part is the bent edge of the moving contact mounting part located on the inner wall, i.e., the stop part is located at the bottom of the U-shaped groove. The moving contact is hinged to the first rotating hole and installed in the U-shaped groove, and is abutted against the stop part by the moving contact spring. The driven part is provided with a second rotating hole and connected to the operating mechanism. The moving contact bracket is set as a plate-shaped double-arm design, which simplifies the processing technology and equipment, improves the quality of parts, and makes the mechanism more stable.
[0014] In some embodiments, the moving contact includes a contact portion, a limiting portion, and a fixing portion. The contact portion is disposed opposite to the stationary contact, and the limiting portion acts on the stop portion of the moving contact support.
[0015] In the above embodiments, the contact portion is disposed opposite to the stationary contact. Under the drive of the operating mechanism, the moving contact contact portion contacts and separates from the stationary contact. The moving contact is mounted on the moving contact mounting portion of the moving contact bracket. The limiting portion acts on the stopping portion of the moving contact bracket to limit the initial position and rotation direction of the moving contact, ensuring the initial pressure and final pressure of the moving contact contact with the stationary contact, and improving the consistency of the circuit breaker contact parameters.
[0016] In some embodiments, the moving contact is a single sheet metal part, the fixed part is provided with a rotating hole, and the moving contact is disposed in the U-shaped groove or at the Z-shaped bend.
[0017] In the above embodiments, the moving contact is a sheet metal stamping structure, which is a single or double-layered sheet metal structure. The moving contact fixing part is provided with a rotating hole. The moving contact is hinged and rotatably mounted on the mounting part of the moving contact bracket through the rotating hole and the first rotating hole of the moving contact bracket. When the moving contact bracket is a single-piece structure, the moving contact is located at the Z-shaped bend of the moving contact mounting part. When the moving contact bracket is a double-piece structure, the moving contact is located in the U-shaped groove of the moving contact mounting part. The single-piece moving contact simplifies the moving contact structure, improves the moving contact disconnection speed, and enhances the circuit breaker's segmentation capability.
[0018] In some embodiments, the moving contact is two sheet metal parts arranged symmetrically, and the fixing part of each sheet metal part is a Z-shaped bending plate with a rotating hole. After the two sheet metal parts are joined together, a U-shaped groove is formed by the Z-shaped bending plate.
[0019] In the above embodiments, the moving contact is a double-arm structure, which consists of two symmetrically arranged sheet metal parts, each sheet metal part having a contact portion at one end and a fixing portion at the other end. The contact part is an arc-shaped boss located on one side near the stationary contact. The fixing part has a rotating hole and a limiting part surrounding the rotating hole. The limiting part is a sheet metal part with a bevel along the thickness direction and at a certain angle. The fixing parts of the two sheet metal parts are Z-shaped bending plates, which are symmetrically arranged and bent in a direction away from each other. The moving contact is a symmetrical assembly structure fixed by riveting or welding. After the moving contact is assembled, it forms a U-shaped groove in the fixing part. The rotating hole on the two fixing parts is a coaxial hole that passes through the U-shaped groove. The moving contact is mounted in the moving contact mounting part through the U-shaped mounting groove and the moving contact bracket. The moving contact is located on both sides of the moving contact bracket through the U-shaped groove. The moving contact is designed as a plate-shaped double-arm design, which simplifies the processing technology and equipment, improves the quality of parts, and reduces the left and right swing of the moving contact. The moving contact moves more flexibly and reliably when the circuit breaker is segmented.
[0020] In some embodiments, the moving contact spring is a single torsion spring or a double torsion spring, and the moving contact spring is disposed on one side of the moving contact and / or the moving contact support, or symmetrically disposed on both sides of the moving contact and the moving contact support.
[0021] In the above embodiments, the moving contact spring is sleeved on the rotating shaft of the hinge hole between the moving contact and the moving contact support. When the moving contact spring is a single torsion spring, it is located on one side of the moving contact or the moving contact support. When the moving contact spring is a double torsion spring, the left and right spring bodies are respectively located on the left and right sides of the moving contact or the moving contact support. The first arm of the moving contact spring is a U-shaped spring arm connecting the left and right spring bodies, and the second arm is a spring arm extending from the left and right spring bodies respectively. The first arm of the moving contact spring abuts against the moving contact support, and the second arm abuts against the moving contact. The moving contact spring elastically abuts the moving contact against the stop portion on the moving contact support. The moving contact spring, the moving contact, and the moving contact support are sleeved on the same metal shaft, making the rotation of the moving contact more flexible.
[0022] In some embodiments, the moving contact device is rotatably disposed within the circuit breaker via the pivot point, and the operating mechanism of the circuit breaker drives the moving contact device to rotate so that the contact portion of the moving contact makes electrical contact and separates from the stationary contact.
[0023] In the above embodiment, the moving contact bracket is rotatably mounted on a fixed shaft inside the circuit breaker via a rotating fulcrum. The circuit breaker drives the moving contact device to rotate around the rotating fulcrum via an operating mechanism. The operating mechanism of the circuit breaker drives the moving contact device to rotate, causing the moving contact to make electrical contact and separate from the stationary contact. During the closing process, the moving contact and stationary contact generate pressure, forcing the moving contact to rotate a certain angle away from the stationary contact, ensuring contact overtravel and contact pressure when the circuit breaker is closed. When the moving contact and stationary contact are disconnected, the moving contact... The contact spring elastically presses the moving contact against the moving contact stop part, ensuring the opening distance between the moving and stationary contacts after the circuit breaker is disconnected, while reducing the movement of the moving contact during the disconnection process. 1. This utility model simplifies the structure of the moving contact support by designing a flat sheet metal structure, greatly reducing the processing technology and equipment requirements, reducing component costs, and improving component quality. The product will not be deformed due to processing or transportation, avoiding quality problems such as slippage, operating mechanism failure, and inflexible opening and closing due to poor consistency of component deformation.
[0024] 2. This utility model sets the moving contact bracket as a flat sheet metal bracket structure. The metal bracket has high mechanical strength, good temperature resistance and wear resistance, and will not deform due to high current heating. The operating mechanism is strong, flexible and reliable, which effectively improves the mechanical life, the consistency and stability of the tripping mechanism, and greatly improves the performance indicators of the circuit breaker. Attached Figure Description
[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0026] Figure 1 This is a partial structural diagram of the internal structure of the circuit breaker of this utility model;
[0027] Figure 2 This is a structural diagram of the moving contact device according to the first embodiment of the present invention;
[0028] Figure 3 This is a structural diagram of the moving contact of the first embodiment of the present invention;
[0029] Figure 4 This is a structural diagram of the moving contact bracket according to the first embodiment of the present invention;
[0030] Figure 5 This is a structural diagram of the moving contact device according to the second embodiment of the present invention;
[0031] Figure 6 This is a structural diagram of the moving contact bracket according to the second embodiment of the present invention;
[0032] Figure 7 This is a structural diagram of the moving contact of the second embodiment of the present invention;
[0033] Figure 8 This is a structural diagram of the moving contact device according to the third embodiment of this utility model;
[0034] Figure 9 This is a structural diagram of the moving contact bracket of the third embodiment of the present utility model. Detailed Implementation
[0035] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of the embodiments of this utility model will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this utility model. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.
[0036] In the description of embodiments of this disclosure, the term "comprising" and similar terms should be understood as open-ended inclusion, i.e., "including but not limited to". The term "one embodiment" or "the embodiment" should be understood as "at least one embodiment". The terms "first", "second", etc., may refer to different or the same objects. Other explicit and implicit definitions may also be included below.
[0037] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.
[0038] like Figure 1As shown, this utility model provides a moving contact device 30 for a circuit breaker. The circuit breaker also includes an operating mechanism 20 and a stationary contact 40. The moving contact device 30 is rotatably disposed inside the circuit breaker. The moving contact device includes at least a moving contact support 302, a moving contact 301, a moving contact spring 304, and a shaft 401. The moving contact support 302 has an elongated plate-like structure. One end of the moving contact support 302 is provided with a driven part 3026, and the other end is provided with a moving contact mounting part 3027. The circuit breaker has a pivot point 3021. The moving contact 301 is rotatably mounted on the moving contact mounting part via a shaft 401. The moving contact spring 304 is a torsion spring, sleeved on the shaft 401. The moving contact spring 304 includes a first arm and a second arm. The first arm is fixedly mounted on the moving contact bracket, and the second arm presses against the moving contact to elastically fix the moving contact on the moving contact bracket. The circuit breaker's operating mechanism drives the moving contact device to rotate, thereby achieving contact and disconnection between the moving contact and the stationary contact.
[0039] For details, please refer to Figure 2 and Figure 3 The moving contact 301 has a double-arm structure, comprising two symmetrically arranged sheet metal parts 301a and 301b. Each sheet metal part has a contact portion 3014 at one end along its length and a fixing portion 3015 at the other end. The contact portion 3014 is an arc-shaped boss extending from the moving contact body, and is located on the side near the stationary contact 40. The fixing portion 3015 has a rotating hole 3012 and a limiting portion 3013 surrounding the rotating hole. The limiting portion 3013 is a sloped surface of the sheet metal part along its thickness direction at a certain angle. The fixing portions 3015 of the two sheet metal parts 301a and 301b are Z-shaped bent plates, which are symmetrically arranged and both are far apart from each other. The two sheet metal parts 301a and 301b are assembled and fixed by riveting or welding. After the moving contact 301 is assembled, the two fixing parts 3015 form a U-shaped groove 3011. The rotating hole 3012 on the two fixing parts 3015 is a coaxial hole that passes through the U-shaped groove 3011. The moving contact is hinged to the moving contact bracket through the rotating hole 3012. The moving contact is set in the moving contact mounting part by cooperating with the moving contact bracket through the U-shaped mounting groove.
[0040] Please refer to Figure 4The moving contact bracket 302 is elongated and is a sheet metal stamping structure. Both ends of the moving contact bracket 302 are respectively provided with a driven part 3026 and a moving contact mounting part 3027. Along the length of the moving contact bracket, a second rotating hole 3022, a rotating fulcrum 3021, and a first rotating hole 3023 are sequentially provided on the moving contact bracket. The second rotating hole 3022, the rotating fulcrum 3021, and the first rotating hole 3023 are circular holes of the same or different diameters. The rotating fulcrum 3021 is approximately located in the middle position. The first rotating hole 3023 is located near the moving contact mounting part 3027, and the second rotating hole 3022 is located near the driven part 3026. The second rotating hole 3022 is used to connect with the operating mechanism 20 of the circuit breaker, and the first rotating hole 3023 is used to hinge with the moving contact 301.
[0041] The moving contact support 302 is also provided with a stop portion 3024. In this embodiment, the stop portion 3024 is a limiting boss. Two limiting bosses are respectively arranged on both sides of the moving contact support 302 in the thickness direction and are staggered. The limiting bosses are stamped by the moving contact support. The limiting bosses on each side are located between the first rotating hole 3023 and the second rotating hole 3022. The stop portion acts on the limiting portion to limit the initial position and rotation direction of the moving contact.
[0042] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 The moving contact bracket 302 is rotatably mounted on a fixed shaft inside the circuit breaker via a rotating fulcrum 3021. The contact portion 3014 of the moving contact is disposed opposite to the stationary contact 40. The moving contact device also includes a metal shaft 401. One end of the moving contact bracket 302 is inserted into the U-shaped groove 3011 of the moving contact 301, and the rotating hole 3012 of the moving contact 301 and the first rotating hole 3023 of the moving contact bracket 302 are aligned. The metal shaft 401 is passed through the rotating hole 3012 and the first rotating hole 3023 to hinge the moving contact 301 and the moving contact bracket 302. After connection, the limiting portion contacts the stopping portion.
[0043] In this embodiment, the moving contact spring 304 is a double torsion spring structure. The left and right spring bodies of the moving contact spring 304 are respectively disposed on both sides of the moving contact 301 and sleeved on the metal shaft 401. One end of the moving contact spring 304 is a first spring arm connecting the left and right spring bodies, and the other end is an independent second spring arm extending from the left and right spring bodies. The first spring arm abuts against the moving contact bracket 302, and the second spring arm abuts against the moving contact 301. Under the pressure of the spring force of the moving contact spring 304, the moving contact 301 is elastically and rotatably fixed to the moving contact bracket through the contact and cooperation of the limiting part and the stopping part. The operating mechanism 20 of the circuit breaker drives the moving contact device 30. The rotational motion causes the moving contact to press against the stationary contact 40. The elastic force generated by the compression of the moving contact spring 304 is applied to the stationary contact 40 through the moving contact. The operating mechanism of the circuit breaker drives the moving contact device to rotate, so that the moving contact and the stationary contact make electrical contact and separate. The contact between the moving contact and the stationary contact of the circuit breaker generates pressure, forcing the moving contact to rotate a certain angle away from the stationary contact, ensuring contact overtravel and contact pressure when the circuit breaker is closed. After the moving contact and the stationary contact of the circuit breaker are disconnected, the moving contact spring elastically presses the moving contact against the stop part, reducing the jitter and rebound of the moving contact during the disconnection process, ensuring the opening distance between the moving contact and the stationary contact after the circuit breaker is disconnected, and improving the stability and reliability of the circuit breaker.
[0044] Second embodiment:
[0045] Please refer to Figure 5 , Figure 6 and Figure 7 The present invention provides a moving contact device for a circuit breaker according to a second embodiment. The moving contact device 30 differs from that in the first embodiment in that the moving contact 301 is a single-arm structure and is a sheet metal part, while the moving contact support 302 is a double-arm structure and consists of two symmetrically arranged elongated sheet metal structures.
[0046] For details, please refer to Figure 6The moving contact bracket 302 has a double-arm structure, consisting of two symmetrically arranged elongated sheet metal brackets 302a and 302b. The moving contact mounting portion 3027 at one end of each sheet metal bracket 302a and 302b is a Z-shaped bent plate. The moving contact mounting portions of the two sheet metal brackets are bent in a direction away from each other. A first rotating hole 3023 is provided on the moving contact mounting portion 3027. The moving contact bracket 302 consists of two elongated sheet metal brackets 302a and 302b. 2b The moving contact bracket 302 is assembled by riveting or welding. After assembly, the moving contact bracket 302 is formed by two adjacent Z-shaped bending plates to form a U-shaped groove 3025. The first rotating holes 3012 on the two moving contact mounting parts 3027 are coaxial holes of equal diameter that penetrate the U-shaped groove 3025. The moving contact bracket is also provided with a stop part 3024. In this embodiment, the stop part 3024 is the bent edge of the moving contact mounting part located on the inner wall. The stop part 3024 is located at the bottom of the U-shaped groove 3025.
[0047] Please refer to Figure 7 The moving contact 301 is a single-arm structure and is at least one sheet metal part. The moving contact 301 has a contact portion 3014 at one end along its length and a fixing portion 3015 at the other end. The contact portion 3014 is an arc-shaped boss extending from the main body of the moving contact. The contact portion 3014 is located on the side close to the stationary contact 40. The fixing portion has a rotating hole 3012 and a limiting portion 3013 surrounding the rotating hole 3012. The limiting portion 3013 is a sloped surface of the sheet metal part along its thickness direction and at a certain angle.
[0048] Please refer to Figure 1 , Figure 5 , Figure 6 and Figure 7 As shown, the moving contact 301 is a single-arm structure, the moving contact 301 is a sheet metal part, and the moving contact support 302 is a double-arm structure. The moving contact bracket 302 consists of two symmetrically arranged, elongated sheet metal brackets. The moving contact bracket 302 is rotatably mounted on a fixed shaft inside the circuit breaker via a rotating fulcrum 3021. The contact portion 3014 of the moving contact is opposite to the stationary contact 40. The rotating hole 3012 of the moving contact 301 is aligned with the first rotating hole 3023 of the moving contact bracket. The moving contact 301 is hinged in the U-shaped groove of the mounting portion of the moving contact bracket 302 via a metal shaft 401. Under the pressure of the spring force of the moving contact spring 304, the moving contact 301 is elastically and rotatably fixed on the moving contact bracket through the contact engagement between the limiting portion and the stopping portion. In this embodiment, the moving contact adopts a single-arm flat plate structure, and the moving contact bracket adopts a double-arm structure, which can achieve the same technical effect as the first embodiment. It will not be described in detail here. The moving contact device structure can be selected according to actual needs.
[0049] Third embodiment:
[0050] Please refer to Figure 8 and Figure 9 The present invention provides a moving contact device for a circuit breaker according to a third embodiment. The moving contact device 30 differs from the first and second embodiments in that both the moving contact support 302 and the moving contact 301 are single-arm structures.
[0051] The moving contact mounting part 3027 is a Z-shaped bent plate, and the Z-shaped bent plate is provided with a first rotating hole 3023. The Z-shaped bend is located between the rotation fulcrum 3021 and the first rotating hole 3023. In this embodiment, the stop part 3024 is the bent edge of the Z-shaped bend. The moving contact 301 is hinged to the first rotating hole 3023 of the moving contact bracket through the rotating hole 3012. The moving contact spring 304 is a double torsion spring structure, and the left and right spring bodies of the moving contact spring 304 are respectively located on the moving contact 301. The moving contact support 302 is sleeved on both sides of the metal shaft 401. One end of the moving contact spring 304 is a first spring arm connecting the left and right spring bodies, and the other end is an independent second spring arm extending from the left and right spring bodies. The first spring arm abuts against the moving contact support 302, and the second spring arm abuts against the moving contact 301. Under the pressure of the moving contact spring 304, the moving contact 301 is elastically and rotatably fixed to the moving contact support through the contact engagement between the limiting part and the stopping part. In this embodiment, both the moving contact and the moving contact support adopt a single-arm structure, achieving the same technical effect as the first and second embodiments. Further details are omitted here; the moving contact device structure can be selected according to actual needs.
[0052] This invention may be implemented in other specific forms without departing from its spirit and essential characteristics. The present embodiments are to be regarded in all respects as exemplary rather than limiting, and the scope of this invention is defined by the appended claims rather than the foregoing description, and all modifications falling within the meaning of the claims and their equivalents are thus included within the scope of this invention.
Claims
1. A moving contact device for a circuit breaker, comprising at least a moving contact bracket, a moving contact, a moving contact spring, and a shaft, wherein the moving contact bracket is a long strip-shaped sheet structure, with a driven part at one end and a moving contact mounting part at the other end, and a rotation fulcrum between the two ends, characterized in that: The moving contact is rotatably mounted on the moving contact mounting part via a shaft. The moving contact spring is a torsion spring, which is sleeved on the shaft. The moving contact spring includes a first arm and a second arm. The first arm is fixedly mounted on the moving contact bracket, and the second arm presses against the moving contact to elastically fix the moving contact on the moving contact bracket. The operating mechanism of the circuit breaker drives the moving contact device to rotate, so that the moving contact presses against the stationary contact of the circuit breaker. The elastic force generated by the compression of the moving contact spring is applied to the stationary contact through the moving contact.
2. The moving contact device of a circuit breaker according to claim 1, wherein: The moving contact support includes a stop portion for limiting the rotation amplitude of the moving contact, and the stop portion is disposed on the path of the moving contact rotating towards the stationary contact.
3. The moving contact device of a circuit breaker of claim 2, wherein: The moving contact bracket is a single flat plate structure. The moving contact mounting part is provided with a first rotating hole. The stop part is a limiting boss arranged around the first rotating hole. The moving contact abuts against the limiting boss through a moving contact spring.
4. The moving contact device of claim 2 wherein: The moving contact bracket is a single-piece bent structure, the moving contact mounting part is a Z-shaped bent plate, the Z-shaped bent plate is provided with a first rotating hole, the stop part is the bent edge of the Z-shaped bent plate, and the moving contact abuts against the bent edge by a moving contact spring.
5. The moving contact device of claim 2 wherein: The moving contact bracket is a symmetrically arranged double sheet metal bracket. The moving contact mounting part of each sheet metal bracket is a Z-shaped bent plate. The Z-shaped bent plates on both sides are bent in a direction away from each other to form a U-shaped groove. The Z-shaped bent plate is provided with a first rotating hole. The stop part is the bent edge of the Z-shaped bent plate.
6. A moving contact device for a circuit breaker according to claim 3 or 4 or 5, characterized in that: The moving contact includes a contact portion, a limiting portion, and a fixing portion. The contact portion is disposed opposite to the stationary contact, and the limiting portion acts on the stop portion of the moving contact support.
7. The moving contact device of claim 5 wherein: The moving contact is a single sheet metal part, and the fixed part of the moving contact is provided with a rotating hole. The moving contact is located in the U-shaped groove or at the Z-shaped bend.
8. The moving contact device of a circuit breaker of claim 6, wherein: The moving contact consists of two symmetrically arranged sheet metal parts. The fixing part of each sheet metal part is a Z-shaped bending plate with a rotating hole. After the two sheet metal parts are joined together, the Z-shaped bending plate forms a U-shaped groove.
9. The moving contact device of a circuit breaker of claim 1, wherein: The moving contact spring is either a single torsion spring or a double torsion spring, and the moving contact spring is disposed on one side of the moving contact and / or the moving contact support, or symmetrically disposed on both sides of the moving contact and / or the moving contact support.
10. The moving contact device of a circuit breaker of claim 1, wherein: The moving contact device is rotatably mounted inside the circuit breaker via the rotating fulcrum. The operating mechanism of the circuit breaker drives the moving contact device to rotate, causing the contact portion of the moving contact to make electrical contact and separate from the stationary contact.