A circuit breaker magnetic yoke assembly

Abstract

The utility model provides a circuit breaker magnetic yoke subassembly relates to circuit breaker magnetic yoke field. This circuit breaker magnetic yoke subassembly, including the magnetic yoke body, the both sides of magnetic yoke body are equipped with the vertical board, the inboard fixed connection of vertical board has a plurality of magnetic conductive rib board, the top of magnetic conductive rib board is equipped with the magnetic conductive groove, the top of magnetic yoke body is equipped with the static contact, the top fixed connection of static contact has static contact point, the bottom of magnetic yoke body is equipped with the locating plate, the bottom of locating plate is equipped with the base, the side surface of magnetic yoke body is equipped with the heat dissipation board, the side surface of heat dissipation board is equipped with a plurality of radiating fins. In the utility model, can make the magnetic force line even distribution, effectively avoid local premature magnetic saturation, promote the magnetic flux density distribution evenness, solved the magnetic yoke material and structure to cause the magnetic circuit uneven, make local premature magnetic saturation, influence the tripping force and response time, cannot satisfy the short -circuit breaking time standard's problem.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker magnetic yokes, specifically a circuit breaker magnetic yoke assembly. Background Technology

[0002] As an important protection and control device in the power system, the reliability of the circuit breaker's performance directly affects the safe and stable operation of the power system. The magnetic yoke assembly, as the core component of the electromagnetic mechanism of the circuit breaker, plays a crucial role in confining the magnetic lines of force generated by the induction coil to diffuse outward, concentrating the magnetic lines of force around the induction coil to improve the efficiency of induction heating, and also plays a magnetic shielding role, undertaking the key role of magnetic conduction and magnetic circuit construction. The magnetic yoke assembly inside the existing circuit breaker can be either an integral structure or a split assembly structure.

[0003] A search revealed an existing patent (publication number: 201821773370.9) that discloses a magnetic yoke device for a circuit breaker, comprising a first magnetic plate and a second magnetic plate. The first and second magnetic plates are identical parts, symmetrically arranged, and the magnetic plates are integrally formed, including a magnetic plate portion and a bent portion for connecting the first and second magnetic plates. While this patented technology provides a magnetic yoke device for a circuit breaker that improves the arc-initiating effect of the magnetic plate, it suffers from problems such as uneven magnetic circuit caused by the yoke material and structure, leading to premature local magnetic saturation. This, in turn, affects the tripping force and response time, failing to meet the short-circuit breaking time standard.

[0004] Therefore, those skilled in the art have provided a circuit breaker yoke assembly to address the problems mentioned in the background section. Utility Model Content

[0005] 1. Technical problems to be solved To address the shortcomings of existing technologies, this application provides a circuit breaker magnetic yoke assembly that solves the problem that uneven magnetic circuits caused by the magnetic yoke material and structure lead to premature local magnetic saturation, affecting tripping force and response time, and failing to meet the short-circuit breaking time standard.

[0006] 2. Technical Solution To achieve the above objectives, this utility model provides the following technical solution: A circuit breaker yoke assembly includes a yoke body, upright plates on both sides of the yoke body, multiple magnetic ribs fixedly connected to the inner side of the upright plates, magnetic grooves on the top of the magnetic ribs, a stationary contact on the top of the yoke body, a stationary contact point fixedly connected to the top of the stationary contact, a positioning plate on the bottom of the yoke body, a base on the bottom of the positioning plate, and a heat dissipation plate on the side of the yoke body, with multiple heat dissipation fins on the side of the heat dissipation plate. Through the above technical solution, the device can make the magnetic field lines uniformly distributed, effectively avoid local premature magnetic saturation, improve the uniformity of magnetic flux density distribution, and solve the problem that the magnetic circuit is uneven due to the magnetic yoke material and structure, which causes local premature magnetic saturation, affects the tripping force and response time, and fails to meet the standard for short circuit breaking time.

[0007] Furthermore, multiple magnetic ribs are evenly arrayed on the inner side of the upright plate, and the magnetic groove is trapezoidal in shape. Through the above technical solutions, the magnetic ribs and magnetic grooves can make the magnetic lines of force evenly distributed, effectively avoid premature local magnetic saturation, and improve the uniformity of magnetic flux density distribution.

[0008] Furthermore, the vertical plate, stationary contact, and positioning plate are integral with the magnetic yoke body, and the magnetic yoke body is formed by stamping Fe-3%Si cold-rolled silicon steel strip; The above technical solution enhances the structural strength of the yoke by integrating the yoke body, enabling the circuit breaker to operate more stably during short-circuit faults.

[0009] Furthermore, the magnetic rib plate is connected to the magnetic yoke body by vacuum diffusion welding, and the magnetic rib plate is made of DT4C electrical pure iron with a hardness of HRB80-85. Through the above technical solution, after vacuum diffusion welding is connected to the magnetic yoke body, it can withstand electromagnetic force impact of 20kA / 10ms without falling off, which greatly reduces the amount of structural deformation under short-circuit impact.

[0010] Furthermore, a limiting shell is fixedly connected to the top of the base, and a groove adapted to the positioning plate is opened on the top of the limiting shell. The positioning plate is located in the top groove of the limiting shell, and the base is made of 304 stainless steel plated with hard chrome. Through the above technical solutions, 304 stainless steel with hard chrome plating is less prone to wear during long-term use, extending its service life. It also enhances the surface smoothness, improves aesthetics and corrosion resistance, and the limiting shell can increase the contact area between itself and the positioning plate.

[0011] Furthermore, both the positioning plate and the limiting shell have two through holes and are movably connected to a first pin. The first pin is fixedly connected to the limiting shell and the positioning plate by laser welding. Through the above technical solution, the first pin can further fix the limiting shell and the positioning plate, preventing the welding position from loosening due to prolonged use.

[0012] Furthermore, positioning holes are provided at the four inner corners of the heat sink and the four inner corners of the magnetic yoke body. A second pin is provided inside the positioning hole, and the second pin is fixedly connected to the magnetic yoke body and the heat sink by laser welding. Through the above technical solution, the second pin can tightly connect the heat sink and the magnetic yoke body, increase the contact area between the two, and fix them tightly.

[0013] Furthermore, multiple heat dissipation fins are fixedly connected to each other, and heat dissipation holes are provided between the heat dissipation fins and the heat dissipation plate. The heat dissipation plate and the heat dissipation fins are both made of 6063 aluminum alloy. By using the above technical solution, heat dissipation is accelerated through forced convection, which can control the operating temperature of the magnetic yoke assembly within a reasonable range, effectively avoiding material performance degradation and insulation failure caused by high temperature, and extending the service life of the magnetic yoke assembly.

[0014] 3. Beneficial effects This utility model provides a circuit breaker magnetic yoke assembly. It has the following beneficial effects: 1. This utility model provides a circuit breaker magnetic yoke assembly. By setting up a vertical plate, magnetic rib plate, magnetic groove, stationary contact, and stationary contact point, the device can make the magnetic lines of force evenly distributed, effectively avoid local premature magnetic saturation, improve the uniformity of magnetic flux density distribution, and solve the problem that the magnetic circuit is uneven due to the magnetic yoke material and structure, which causes local premature magnetic saturation, affects the tripping force and response time, and fails to meet the standard for short circuit breaking time.

[0015] 2. This utility model provides a circuit breaker yoke assembly. By setting up the yoke body, vertical plate, magnetic rib plate, stationary contact, positioning plate, base, limiting shell, and first pin, the device enhances the structural strength of the yoke body, enabling the circuit breaker to operate more stably during short-circuit faults. The laser welding fixation between the limiting shell and the yoke body, and between the magnetic rib plate and the yoke body, is reduced by 60% compared to traditional arc welding, reducing the impact of the welding process on the magnetic properties of the yoke and improving product quality.

[0016] 3. This utility model provides a circuit breaker magnetic yoke assembly. By setting up a heat sink, heat sink fins and heat sink holes, the device significantly increases the heat dissipation area and accelerates heat dissipation through forced convection. This can control the operating temperature of the magnetic yoke assembly within a reasonable range, effectively avoid material performance degradation and insulation failure caused by high temperature, and extend the service life of the magnetic yoke assembly. Attached Figure Description

[0017] Figure 1 This is an axial view schematic diagram of the present invention; Figure 2 This is a side-axis view schematic diagram of the present invention; Figure 3 This is a schematic axial sectional view of the present invention; Figure 4 For the present utility model Figure 3 Enlarged view of point A; Figure 5 This is an axial view schematic diagram of the heat sink of this utility model; Figure 6 This is an enlarged schematic diagram of point B of the heat sink of this utility model.

[0018] In the picture: 1. Magnetic yoke body; 2. Vertical plate; 3. Magnetic guide rib; 4. Magnetic guide groove; 5. Stationary contact; 6. Stationary contact point; 7. Positioning plate; 8. Base; 9. Limiting shell; 10. First pin; 11. Heat sink plate; 12. Positioning hole; 13. Second pin; 14. Heat sink fins; 15. Heat sink hole. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of specific embodiments. Obviously, the described specific embodiments are only a part of the specific embodiments of the present invention, and not all of them. Based on the specific embodiments of the present invention, all other specific embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Specific implementation method 1: Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 This embodiment of a circuit breaker yoke assembly includes a yoke body 1, upright plates 2 on both sides of the yoke body 1, multiple magnetic ribs 3 fixedly connected to the inner side of the upright plates 2, magnetic grooves 4 formed on the top of the magnetic ribs 3, stationary contacts 5 on the top of the yoke body 1, stationary contact points 6 fixedly connected to the top of the stationary contacts 5, a positioning plate 7 at the bottom of the yoke body 1, a base 8 at the bottom of the positioning plate 7, a heat dissipation plate 11 on the side of the yoke body 1, multiple heat dissipation fins 14 on the side of the heat dissipation plate 11, and multiple magnetic ribs 3 evenly arrayed on the inner side of the upright plates 2. The magnetic grooves 4 are trapezoidal in shape. The upright plates 2, stationary contacts 5, and positioning plates 7 are connected to the yoke body 1. The magnetic yoke body 1 is a single unit, formed by stamping Fe-3%Si cold-rolled silicon steel strip. The magnetic rib plate 3 is connected to the magnetic yoke body 1 by vacuum diffusion welding. The magnetic rib plate 3 is made of DT4C electrical pure iron with a hardness of HRB80-85. The top of the base 8 is fixedly connected to the limiting shell 9. The top of the limiting shell 9 has a groove that matches the positioning plate 7. The positioning plate 7 is located in the groove at the top of the limiting shell 9. The base 8 is made of 304 stainless steel plated with hard chrome. The interior of the positioning plate 7 and the interior of the limiting shell 9 both have two through holes and are movably connected to the first pin 10. The first pin 10 is fixedly connected to the limiting shell 9 and the positioning plate 7 by laser welding.

[0021] In this embodiment, a circuit breaker yoke assembly is described. The arrangement of the vertical plate 2, magnetic rib 3, magnetic groove 4, stationary contact 5, and stationary contact point 6 enables the device to uniformly distribute magnetic lines of force, effectively preventing premature local magnetic saturation and improving the uniformity of magnetic flux density distribution. This solves the problem of uneven magnetic circuits caused by yoke materials and structures, leading to premature local magnetic saturation, affecting tripping force and response time, and failing to meet short-circuit breaking time standards. The arrangement of the yoke body 1, vertical plate 2, magnetic rib 3, stationary contact 5, positioning plate 7, base 8, limiting shell 9, and first pin 10 enhances the structural strength of the yoke body 1, allowing the circuit breaker to operate more stably during short-circuit faults. Furthermore, the laser welding fixing between the limiting shell 9 and the yoke body 1, and between the magnetic rib 3 and the yoke body 1, reduces the welding process's impact on the yoke's magnetic properties by 60% compared to traditional arc welding, thus improving product quality.

[0022] The working principle of the above embodiment is as follows: In use, the positioning plate 7 is placed inside the limiting shell 9, and then the through hole inside the positioning plate 7 is aligned with the through hole inside the limiting shell 9. After alignment, the first pin 10 is placed in the through hole, and then the first pin 10 is welded to the external laser welder to fix the positioning plate 7 and the limiting shell 9. Then, the base 8 is placed in the internal slot of the circuit breaker to limit the position of the base 8. After the position is limited, the base 8 is welded to the circuit breaker to fix it using an external laser welder, thereby fixing the magnetic yoke. Position of body 1: When the circuit breaker is in normal working condition, the current in the circuit where the circuit breaker is located is within the normal range, and the magnetic yoke assembly does not have any special action. When a short circuit fault occurs in the circuit, the short circuit current increases dramatically in an instant. This current flows through the coil that cooperates with the magnetic yoke assembly. According to the principle of electromagnetic induction, the current passing through the coil will generate a magnetic field. When the magnetic field generated by the coil appears, the magnetic yoke body 1 and the magnetic rib plate 3 together form a graded magnetic guiding path. The magnetic groove 4 at the top of the magnetic rib plate 3 changes the propagation direction and distribution of the magnetic lines of force, so that the magnetic lines of force are more evenly distributed in the entire magnetic circuit. Specific implementation method 2: Please see Figure 5 , Figure 6 In this embodiment, a circuit breaker magnetic yoke assembly has positioning holes 12 at the four inner corners of the heat sink 11 and the four inner corners of the magnetic yoke body 1. The positioning holes 12 are provided with second pins 13. The second pins 13 are fixedly connected to the magnetic yoke body 1 and the heat sink 11 by laser welding. Multiple heat sink fins 14 are fixedly connected to each other. Heat sink fins 14 and heat sink 11 are provided with heat sink holes 15. The heat sink 11 and the heat sink fins 14 are both made of 6063 aluminum alloy.

[0024] In this embodiment, a circuit breaker yoke assembly is provided. It should be noted that the arrangement of the heat sink 11, heat sink fins 14, and heat sink holes 15 significantly increases the heat dissipation area of ​​the device. By accelerating heat dissipation through forced convection, the operating temperature of the yoke assembly can be controlled within a reasonable range, effectively avoiding material performance degradation and insulation failure caused by high temperature, and extending the service life of the yoke assembly.

[0025] The working principle of the above embodiment is as follows: When the magnetic yoke body 1 is working, the heat generated by it is transferred to the interior of the heat sink 11. The heat sink 11 then transfers the heat to the interior of the heat sink fins 14. Since there are a large number of heat sink fins and they are spaced apart from each other, heat dissipation holes 15 are formed between them and the heat sink 11, which greatly increases the contact area with the air. After the heat is transferred to the surface of the heat sink fins 14 through thermal conduction, it can be quickly dissipated into the surrounding air by thermal convection, thereby achieving heat dissipation.

[0026] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0027] Although specific embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these specific embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A circuit breaker yoke assembly, comprising a yoke body (1), characterized in that: The magnetic yoke body (1) has upright plates (2) on both sides. Multiple magnetic ribs (3) are fixedly connected to the inner side of the upright plates (2). A magnetic groove (4) is opened on the top of the magnetic ribs (3). A stationary contact (5) is provided on the top of the magnetic yoke body (1). A stationary contact point (6) is fixedly connected to the top of the stationary contact (5). A positioning plate (7) is provided at the bottom of the magnetic yoke body (1). A base (8) is provided at the bottom of the positioning plate (7). A heat dissipation plate (11) is provided on the side of the magnetic yoke body (1). Multiple heat dissipation fins (14) are provided on the side of the heat dissipation plate (11).

2. A circuit breaker yoke assembly according to claim 1, characterized in that: Multiple magnetic ribs (3) are evenly arrayed on the inner side of the upright plate (2), and the magnetic groove (4) is trapezoidal in shape.

3. A circuit breaker yoke assembly according to claim 1, characterized in that: The vertical plate (2), the stationary contact (5) and the positioning plate (7) are integrated with the magnetic yoke body (1). The magnetic yoke body (1) is formed by stamping Fe-3%Si cold-rolled silicon steel strip.

4. A circuit breaker yoke assembly according to claim 1, characterized in that: The magnetic rib (3) is connected to the magnetic yoke body (1) by vacuum diffusion welding. The magnetic rib (3) is made of DT4C electrical pure iron with a hardness of HRB80-85.

5. A circuit breaker yoke assembly according to claim 1, characterized in that: The base (8) is fixedly connected to the top of the limiting shell (9), and the top of the limiting shell (9) is provided with a groove that matches the positioning plate (7). The positioning plate (7) is located in the top groove of the limiting shell (9). The base (8) is made of 304 stainless steel plated with hard chrome.

6. A circuit breaker yoke assembly according to claim 1, characterized in that: The positioning plate (7) and the limiting shell (9) each have two through holes and are movably connected to a first pin (10). The first pin (10) is fixedly connected to the limiting shell (9) and the positioning plate (7) by laser welding.

7. A circuit breaker yoke assembly according to claim 1, characterized in that: Positioning holes (12) are provided at the four inner corners of the heat sink (11) and the four inner corners of the magnetic yoke body (1). A second pin (13) is provided inside the positioning hole (12). The second pin (13) is fixedly connected to the magnetic yoke body (1) and the heat sink (11) by laser welding.

8. A circuit breaker yoke assembly according to claim 1, characterized in that: Multiple heat dissipation fins (14) are fixedly connected to each other, and heat dissipation holes (15) are provided between the heat dissipation fins (14) and the heat dissipation plate (11). The heat dissipation plate (11) and the heat dissipation fins (14) are both made of 6063 aluminum alloy.

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