Coil type tripping device for circuit breaker
By improving the structure of the coil-type tripping device, including the wiring board, support arm, and magnetic base positioning groove, the problems of difficult wiring and unstable connection were solved, resulting in more reliable wiring and more stable electrical connection, thus improving the service life and operational reliability of the circuit breaker.
Patent Information
- Application Number
- CN202520162466.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-23
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2035-01-23
AI Technical Summary
Existing coil-type tripping devices are difficult to wire, resulting in time-consuming and labor-intensive wiring, affecting structural reliability, and the connection is unstable, making them prone to failure due to vibration and impact.
A structure including a housing, an armature, first and second terminal blocks, and an electromagnetic coil is designed. The connection between the bending part and the contact plate avoids excessive bending of the electromagnetic coil. Combined with the sleeve support arm, the magnetic seat positioning groove, and the limiting corner, the stability and reliability of the connection are ensured.
This results in more reliable wiring, more stable connections, avoidance of loosening due to vibration and impact, extended equipment life, and improved system safety and reliability.
Smart Images
Figure CN223797324U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a coil-type tripping device for circuit breakers. Background Technology
[0002] Molded case circuit breakers (MCCBs) are commonly used in power distribution products. The magnetic trip units used in these products mainly come in two types: coil type and snap-action type. The coil-type trip unit operates on the principle of electrodynamics. When a fault such as a short circuit occurs in the circuit, and the current reaches the set value, the electrodynamic force generated by the current through the electromagnetic coil is large enough to drive the tripping mechanism, causing the circuit breaker to quickly trip and thus disconnect the faulty circuit, providing short-circuit protection. A coil-type trip unit typically includes an armature, a transmission mechanism, an electromagnetic coil, and a tripping element. Currently, to ensure the safety of circuit breakers and for some special application scenarios, and to ensure the reliability of the tripping, the thickness and width of the electromagnetic coil are becoming increasingly larger. This makes wiring operations difficult during production and processing, requiring large-angle bending to complete the wiring action, which is time-consuming and labor-intensive, affects the wiring effect, and is detrimental to improving the overall structural reliability. Utility Model Content
[0003] To address the shortcomings of existing technologies, this utility model provides a coil-type tripping device for circuit breakers, which has a simple structure, is easier and more convenient to assemble, has more reliable coil wiring, and has good performance.
[0004] To achieve the above objectives, this utility model provides a coil-type tripping device for a circuit breaker, comprising a housing, a tripping component disposed within the housing, an armature, a first terminal block, and a second terminal block disposed within the housing, an electromagnetic coil wound around the armature, one end of the first terminal block extending outward from the housing, and the other end bent to form a bent portion, the bent portion being attached to one of the contacts of the electromagnetic coil, one end of the second terminal block extending towards the arc-extinguishing chamber, the other end being a contact end and disposed close to another contact of the electromagnetic coil, a contact plate disposed on the side wall of the contact end, the contact plate being connected to the side wall of the other contact of the electromagnetic coil.
[0005] The beneficial effects of this design are as follows: With this configuration of the first and second terminal block structures, a stable connection with the contact plate and bending section can be achieved without excessive bending or adjustment of the electromagnetic coil's connection point. This avoids bending the ends of the electromagnetic coil, preventing potential coil damage or performance degradation. Simultaneously, it ensures a stable connection between the terminal block and the electromagnetic coil, guaranteeing the robustness and reliability of the electrical connection regardless of normal operation or exposure to vibration or impact. This prevents problems such as poor contact, increased resistance, and localized overheating caused by loose connections, thereby ensuring stable operation of the circuit system, extending the equipment's lifespan, reducing the probability of equipment failure due to connection faults, and providing a solid guarantee for the safe and efficient operation of the overall system.
[0006] As a further feature of this utility model, the armature is fitted with a sleeve, the electromagnetic coil is wrapped around the sleeve, and the sleeve forms a support arm corresponding to the connection position between the first terminal block and the electromagnetic coil.
[0007] The beneficial effects of this design are as follows: The magnetic coil is tightly wrapped around the sleeve, and a support arm is specifically designed on the sleeve at the connection point between the first terminal block and the electromagnetic coil. This structure significantly improves the stability of the connection point between the terminal block and the electromagnetic coil. The support arm provides reliable physical support for the connection, effectively avoiding the risk of loosening due to the connection point being suspended or lacking a stable support. When the equipment encounters vibration or shaking during operation, the support arm can buffer the impact of external forces on the connection point, ensuring that the first terminal block and the electromagnetic coil always maintain a good electrical connection. This not only ensures the stability of current transmission during normal operation of the electromagnetic coil, avoiding problems such as resistance changes and overheating caused by unstable connections, but also greatly extends the service life of the equipment and improves the overall reliability of operation.
[0008] As a further feature of this utility model, a magnetic base is provided in the housing, and positioning plates are respectively provided at both ends of the magnetic base. Positioning grooves are opened on the positioning plates, and the armature is locked in the positioning grooves. A side plate is provided on one side of the magnetic base, and an assembly gap is formed between the side plate and the armature. A baffle extends from the side plate toward the arc extinguishing chamber in the housing, and a positioning gap is formed between the baffle and the housing. The second wiring plate is locked in the positioning gap.
[0009] The beneficial effects of this design are as follows: The positioning plates and slots at both ends of the magnetic base precisely hold the armature in place, fundamentally ensuring the stability of the magnetic structure. This allows the armature to maintain a precise position during operation, preventing displacement or shaking that could affect the magnetic attraction effect, thus ensuring the efficient operation of the entire magnetic system. Simultaneously, the assembly gap between the side plate on one side of the magnetic base and the armature facilitates component installation and debugging. The baffle extending from the side plate towards the arc-extinguishing chamber in the housing forms a positioning gap with the housing, firmly holding the second terminal block within it. This design greatly ensures the reliability of the terminal block's position, preventing loosening or displacement during use, ensuring the stability of the electrical connection, and effectively reducing the probability of electrical failures.
[0010] As a further feature of this invention, the housing is provided with a limiting wall at the edge of the magnetic base, and a limiting corner is formed on the limiting wall, and the magnetic base is engaged in the limiting corner.
[0011] The beneficial effects of this design are: by using a limiting angle, the magnetic holder can be precisely and firmly secured within the device. This structure is remarkably effective in stabilizing the magnetic holder during normal use. It not only effectively prevents displacement or shaking of the magnetic holder during normal operation, ensuring it remains in a precise working position and guaranteeing the accuracy of its fit with other components, but also provides a certain degree of resistance to external vibrations and impacts, preventing the magnetic holder from detaching from its installation position due to external interference. This significantly improves the stability and reliability of the entire device in various complex environments. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;
[0013] Figure 2 This is a schematic diagram of the overall structure of the electromagnetic base in an embodiment of this utility model. Detailed Implementation
[0014] This utility model provides an embodiment of a coil-type tripping device for a circuit breaker, such as... Figures 1 to 2As shown, the device includes a housing 1, in which a tripping element 11 is provided. The housing 1 also includes an armature 2, a first terminal block 4, and a second terminal block 5. An electromagnetic coil 3 is wound around the armature 2. One end of the first terminal block 4 extends outward from the housing 1, and the other end is bent to form a bent portion. The bent portion is attached to one of the contact heads of the electromagnetic coil 3. One end of the second terminal block 5 extends into the arc-extinguishing chamber, and the other end is a contact end that is close to another contact head of the electromagnetic coil 3. A contact plate 51 is provided on the side wall of the contact end, and the contact plate 51 is connected to the side wall of the other contact head of the electromagnetic coil 3. The beneficial effects of this configuration are as follows: With this configuration of the first terminal block 4 and the second terminal block 5, a stable connection with the contact plate 51 and the bending section can be achieved without excessive bending or adjustment of the connection position of the electromagnetic coil 3. This avoids bending the ends of the electromagnetic coil 3, preventing potential coil damage or performance degradation. Simultaneously, it ensures a stable connection between the terminal block and the electromagnetic coil 3. Whether the equipment is operating normally or subjected to vibration or impact, the robustness and reliability of the electrical connection are guaranteed. This prevents problems such as poor contact, increased resistance, and localized overheating caused by loose connections, thereby ensuring the stable operation of the circuit system, extending the equipment's service life, reducing the probability of equipment failure due to connection faults, and providing a solid guarantee for the safe and efficient operation of the overall system.
[0015] As a further feature of this embodiment, the armature 2 is fitted with a sleeve 21, and the electromagnetic coil 3 is wrapped around the sleeve 21. A support arm 22 is formed on the sleeve 21 at the connection point between the first terminal block 4 and the electromagnetic coil 3. The beneficial effects of this configuration are: the electromagnetic coil is tightly wrapped around the sleeve 21, and the sleeve 21 is specifically designed with a support arm 22 at the connection point between the first terminal block 4 and the electromagnetic coil 3. This structure significantly improves the stability of the connection point between the terminal block and the electromagnetic coil 3. The support arm 22 provides reliable physical support for the connection, effectively avoiding the risk of loosening due to the connection point being suspended or lacking a stable support. When the equipment encounters vibration or shaking during operation, the support arm 22 can buffer the impact of external forces on the connection point, ensuring that the first terminal block 4 and the electromagnetic coil 3 always maintain a good electrical connection. This not only ensures the stability of current transmission during normal operation of the electromagnetic coil 3, avoiding problems such as resistance changes and overheating caused by unstable connections, but also greatly extends the service life of the equipment and improves the overall operational reliability.
[0016] As a further feature of this embodiment, a magnetic base 6 is provided in the housing 1. Positioning plates 61 are respectively provided at both ends of the magnetic base 6, and positioning grooves are formed on the positioning plates 61. The armature 2 is engaged in the positioning grooves. A side plate 62 is provided on one side of the magnetic base 6, forming an assembly gap between the side plate 62 and the armature 2. A baffle extending from the side plate 62 towards the arc-extinguishing chamber in the housing 1 forms a positioning gap between the baffle and the housing 1. The second wiring plate 5 is engaged in the positioning gap. The beneficial effect of this configuration is that the positioning plates 61 at both ends of the magnetic base 6 and the positioning grooves thereon can accurately engage the armature 2, fundamentally ensuring the stability of the magnetic structure. This allows the armature 2 to maintain a precise position during operation, avoiding displacement or shaking that could affect the magnetic attraction effect, thereby ensuring the efficient operation of the entire magnetic system. At the same time, the assembly gap between the side plate 62 on one side of the magnetic base 6 and the armature 2 provides convenience for component installation and debugging. The baffle extending from the side plate 62 toward the arc-extinguishing chamber in the housing 1 forms a positioning gap with the housing 1, securely holding the second terminal block 5 within it. This design greatly ensures the reliability of the terminal block's position, preventing it from loosening or shifting during use, ensuring the stability of the electrical connection, and effectively reducing the probability of electrical faults.
[0017] As a further feature of this embodiment, the housing 1 is provided with a limiting wall 12 at the edge of the magnetic base 6, and a limiting angle is formed on the limiting wall 12, in which the magnetic base 6 is engaged. The beneficial effect of this design is that, through the limiting angle, the magnetic base 6 can be precisely and firmly engaged. This structure is highly effective in stabilizing the installation of the magnetic base 6. It not only effectively prevents displacement or shaking of the magnetic base 6 during normal use, ensuring that the magnetic base 6 is always in a precise working position and guaranteeing the accuracy of its fit with other components, but also, to a certain extent, resists external vibrations and impacts, preventing the magnetic base 6 from detaching from its installation position due to external interference, thereby significantly improving the stability and reliability of the entire device in various complex environments.
[0018] The above examples are merely one preferred embodiment of this utility model. Ordinary variations and substitutions made by those skilled in the art within the scope of this utility model's technical solution are all included within the protection scope of this utility model.
Claims
1. A coil-type tripping device for a circuit breaker, comprising a housing, wherein a tripping element is disposed within the housing, characterized in that: The housing contains an armature, a first terminal block, and a second terminal block. An electromagnetic coil is wound around the armature. One end of the first terminal block extends outward from the housing, and the other end is bent to form a bend. The bend is attached to one of the contacts of the electromagnetic coil. One end of the second terminal block extends into the arc-extinguishing chamber, and the other end is a contact end that is close to another contact of the electromagnetic coil. A contact plate is provided on the side wall of the contact end, and the contact plate is connected to the side wall of the other contact of the electromagnetic coil.
2. The coil-type tripping device for a circuit breaker according to claim 1, characterized in that: The armature is fitted with a sleeve, the electromagnetic coil is wrapped around the sleeve, and the sleeve forms a support arm corresponding to the connection position between the first terminal block and the electromagnetic coil.
3. The coil-type tripping device for a circuit breaker according to claim 1, characterized in that: A magnetic base is provided in the housing, and positioning plates are respectively provided at both ends of the magnetic base. Positioning slots are opened on the positioning plates, and the armature is locked in the positioning slots. A side plate is provided on one side of the magnetic base, and an assembly gap is formed between the side plate and the armature. A baffle extends from the side plate toward the arc extinguishing chamber in the housing, and a positioning gap is formed between the baffle and the housing. The second wiring board is locked in the positioning gap.
4. The coil-type tripping device for a circuit breaker according to claim 3, characterized in that: The housing has a limiting wall at the edge of the magnetic base, and a limiting angle is formed on the limiting wall, and the magnetic base is locked in the limiting angle.