A new circuit breaker arc quenching system

Abstract

The utility model relates to new circuit breaker arc extinguishing system, including arc sheet, set up in the breaking area of moving contact and static contact's arc extinguishing chamber and lattice piece group, the one end of arc sheet is connected static contact, the other end of arc sheet is towards the lattice piece group setting, the lattice piece group sets up in the arc extinguishing chamber, the lattice piece group includes multilayer arrangement's arc extinguishing lattice piece, to the direction of moving away static contact, the arc extinguishing lattice piece of the outermost side of lattice piece group is first lattice piece, to the side close to static contact, along the arrangement path of arc extinguishing lattice piece, the first lattice piece extends and sets up guide portion, the utility model shortens the distance of first lattice piece to moving contact and static contact contact position through guide portion, when moving contact and static contact disconnect, the arc produced connects the end of moving contact and shifts to first lattice piece, need not moving contact to move to the position of first lattice piece, and then enhance arc extinguishing speed.

Description

Technical Field

[0001] This utility model relates to the field of arc-extinguishing switchgear technology, and in particular to a new circuit breaker arc-extinguishing system. Background Technology

[0002] The arc extinguishing system is a core functional component of a circuit breaker, and it is directly related to the safety and reliability of the circuit breaker when interrupting current.

[0003] The faster the arc extinguishing speed of the arc extinguishing system, the less harm the fault current poses to the circuit, equipment, and personnel. Traditional air grid arc extinguishing relies on the arc-starting plate, electromagnetic force, and the rising heat generated by the arc to drive the arc towards the arc extinguishing grid. This method is difficult to quickly and directionally drive the arc, resulting in a slow speed at which the arc reaches each arc extinguishing grid. The energy distribution of the arc among the grids is also uneven, and the arc extinguishing capacity of the grid is not fully utilized, thus affecting the arc extinguishing speed.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0005] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a new circuit breaker arc extinguishing system to improve the arc extinguishing speed of the arc extinguishing system.

[0006] The technical solution of this utility model is as follows: A novel arc-extinguishing system for circuit breakers is disposed within the circuit breaker housing. This system includes an arc-initiating element, an arc-extinguishing chamber located in the breaking areas of the moving and stationary contacts, and a grid assembly. One end of the arc-initiating element is connected to the stationary contact, and the other end faces the grid assembly. The grid assembly is disposed within the arc-extinguishing chamber and comprises multiple arc-extinguishing grids arranged in layers. The outermost arc-extinguishing grid in the grid assembly, moving away from the stationary contact, is the first grid. A guide portion extends from the first grid along the arrangement path of the arc-extinguishing grids, moving closer to the stationary contact.

[0007] A further technical solution is that the arc-extinguishing chamber also includes an arc-blocking plate, with the grid plate group arranged between adjacent arc-blocking plates.

[0008] A further technical solution involves providing mounting holes on the arc-blocking plate. An extension portion on the arc-extinguishing grid plate extends into the mounting holes.

[0009] A further technical solution involves providing a notch on the side of the arc-extinguishing grid near the moving contact along the arrangement direction of the arc-extinguishing grids, with the notches on multiple arc-extinguishing grids combining to form a groove. The moving path of the end of the moving contact is within this groove.

[0010] A further technical solution is that the arc-extinguishing chamber also includes two insulating components, which respectively cover the side wall of the groove and the end face of the grid assembly where the groove is opened.

[0011] A further technical solution is that one end of the insulating component contacts the stationary contact, and the other end of the insulating component extends to provide a buckle, which contacts the surface of the arc-blocking plate away from the stationary contact.

[0012] A further technical solution involves providing an insulating extension at one end of the insulating component that contacts the stationary contact. The stationary contact is positioned between the insulating extensions of the two insulating components.

[0013] A further technical solution is to open a slot on the circuit breaker housing for the insulation extension to extend into.

[0014] A further technical solution is that the bottom surface of the groove is set along the moving path of the moving contact.

[0015] The beneficial technical effects of this utility model are as follows: (1) The novel arc extinguishing system of this utility model is provided with an arc extinguishing chamber and a grid plate group in the breaking area of ​​the moving contact and the stationary contact. When the arc generated when the moving contact and the stationary contact separate, the arc is divided into small pieces to reduce energy when it passes through the arc extinguishing grid. At the same time, the arc extinguishing grid absorbs the energy of the arc to extinguish it. Meanwhile, the stationary contact is connected to an arc-initiating plate, and a guide part is also provided on the first grid plate away from the stationary contact. The arc-initiating plate can guide the end of the arc connected to the stationary contact to move quickly to the grid plate group, which greatly shortens the time for the arc to reach the grid plate group. At the same time, the arc moves along the arc-initiating plate to ensure that the arc moves to the preset position of the grid plate group to reduce the positional error of the arc movement. The guide part is arranged along the arrangement path of the arc extinguishing grid plates. On the one hand, the guide part shortens the distance from the first grid plate to the contact position of the moving contact and the stationary contact, which makes it easier for the end of the arc connected to the moving contact to be transferred to the first grid plate when the moving contact and the stationary contact are disconnected, without the moving contact needing to move to the position of the first grid plate, thereby improving the arc extinguishing speed. On the other hand, the guide part arranged along the arrangement path of the arc-extinguishing grid can quickly guide the arc on the first grid to the other arc-extinguishing grids, improve the uniformity of the arc distribution on the first grid, mobilize different arc-extinguishing grids to extinguish the arc, and further improve the arc extinguishing speed.

[0016] (2) Furthermore, the grid assembly is provided with a groove, and the moving path of the end of the moving contact is in the groove, so that the arc on the moving contact can jump directly to the middle position of the arc-extinguishing grid and then move to both ends of the arc-extinguishing grid. The arc-extinguishing grid absorbs the energy of the arc more quickly and improves the arc-extinguishing speed.

[0017] (3) Furthermore, one end of the insulating component contacts the stationary contact, and the other end is provided with a snap-fit ​​connection to the outer shell. The installation method is simple and improves the assembly efficiency of the arc-extinguishing chamber. At the same time, the insulating component abuts against the stationary contact, improving the stability of the stationary contact. Attached Figure Description

[0018] Figure 1 A vertical cross-sectional view of the circuit breaker in the open state is shown when a novel circuit breaker arc extinguishing system according to an embodiment of the present disclosure is installed inside the circuit breaker.

[0019] Figure 2 A vertical cross-sectional view of the circuit breaker in the closed state is shown when the novel circuit breaker arc extinguishing system of an embodiment of the present disclosure is installed inside the circuit breaker.

[0020] Figure 3 A three-dimensional structural schematic diagram of the arc-extinguishing chamber in a novel circuit breaker arc-extinguishing system according to an embodiment of the present disclosure is shown.

[0021] Figure 4 An exploded structural diagram of the arc-extinguishing chamber in a novel circuit breaker arc-extinguishing system according to an embodiment of the present disclosure is shown.

[0022] Marked in the attached diagram: 1. Circuit breaker housing; 11. Arc-starting plate; 2. Stationary contact; 3. Moving contact; 4. Arc-extinguishing chamber; 41. Arc-blocking plate; 411. Mounting hole; 42. Plate assembly; 421. First plate; 422. Arc-extinguishing plate; 423. Guide section; 424. Extension section; 425. Groove; 43. Insulating component; 431. Snap-fit; 432. Insulating extension section. Detailed Implementation

[0023] To make the objectives, features, and advantages of this utility model more apparent and understandable, please refer to the accompanying drawings. It should be noted that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the content disclosed herein. They are not intended to limit the implementation conditions of this utility model and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effects and objectives achieved by this utility model, should still fall within the scope of the technical content disclosed in this utility model.

[0024] In the description of this utility model, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and 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 utility model.

[0025] Figure 1A vertical cross-sectional view of the circuit breaker in the open state is shown when a novel circuit breaker arc extinguishing system according to an embodiment of the present disclosure is installed inside the circuit breaker. Figure 2 A vertical cross-sectional view of the circuit breaker in the closed state is shown when the novel circuit breaker arc extinguishing system of an embodiment of the present disclosure is installed inside the circuit breaker. Figure 3 A three-dimensional structural schematic diagram of the arc-extinguishing chamber in a novel circuit breaker arc-extinguishing system according to an embodiment of the present disclosure is shown. Figure 4 An exploded structural diagram of the arc-extinguishing chamber in a novel circuit breaker arc-extinguishing system according to an embodiment of this disclosure is shown. Please refer to... Figure 1 , Figure 2 , Figure 3 and Figure 4A novel arc-extinguishing system for circuit breakers is disclosed, housed within the circuit breaker housing 1. This system includes an arc-initiating plate 11, an arc-extinguishing chamber 4 disposed in the breaking area of ​​the moving contact 3 and the stationary contact 2, and a grid plate assembly 42. When the arc generated during the separation of the moving contact 3 and the stationary contact 2 passes through the arc-extinguishing grid, it is broken into smaller pieces to reduce energy. Simultaneously, the arc-extinguishing grid absorbs the energy of the arc, thus extinguishing it. One end of the arc-initiating plate 11 is connected to the stationary contact 2, and the other end faces the grid plate assembly 42. The grid plate assembly 42 is disposed within the arc-extinguishing chamber 4 and comprises multiple arc-extinguishing grid plates 422 arranged in layers. The arc-initiating plate 11 guides the end of the arc connected to the stationary contact 2 to quickly move onto the grid plate assembly 42, significantly shortening the time it takes for the arc to reach the grid plate assembly 42. Simultaneously, the arc moves along the arc-initiating plate 11, ensuring that the arc reaches a preset position on the grid plate assembly 42 to reduce positional errors in arc movement. Moving away from the stationary contact 2, the outermost arc-extinguishing grid 422 of the grid assembly 42 is the first grid 421. Along the arrangement path of the arc-extinguishing grids 422, a guide portion 423 extends from the first grid 421 towards the stationary contact 2. On one hand, the guide portion 423 shortens the distance from the first grid 421 to the contact position between the moving contact 3 and the stationary contact 2, facilitating the transfer of the arc generated when the moving contact 3 and the stationary contact 2 disconnects to the first grid 421, eliminating the need for the moving contact 3 to move to the position of the first grid 421, thereby increasing the arc-extinguishing speed. On the other hand, the guide portion 423, arranged along the arrangement path of the arc-extinguishing grids 422, can quickly guide the arc on the first grid 421 to the other arc-extinguishing grids 422, improving the uniformity of the arc distribution on the first grid 421, and mobilizing different arc-extinguishing grids 422 for arc extinguishing, further increasing the arc-extinguishing speed. In some embodiments, the first grid plate 421 and the guide portion 423 can be integrally formed, with the guide portion 423 having an increased thickness compared to the first grid plate 421. Integral formation facilitates arc transmission while simplifying the structure of the grid plate assembly 42. For example, the first grid plate 421 and the guide portion 423 can be formed by bending a metal sheet. The increased thickness of the guide portion 423 allows it to absorb more arc heat, increases its surface area, and improves its structural strength. Increased surface area enhances the heat conduction rate of the guide portion 423; increased structural strength allows the guide portion 423 to resist greater thermal deformation and arc impact, thereby extending its service life.

[0026] Specifically, the arc-starting plate 11 can be made of pure copper. The arc-starting plate 11 can be electrically connected to the stationary contact 2 by welding or riveting. The arc-starting plate 11 and the stationary contact 2 are at the same potential, facilitating the smooth movement of the arc from the stationary contact 2 to the arc-starting plate 11. In some embodiments, the radial cross-section of the end of the arc-starting plate 11 connected to the stationary contact 2 is the largest, and the radial cross-sectional area of ​​the arc-starting plate 11 gradually decreases in the direction away from the stationary contact 2, enhancing the effect of the arc-starting plate 11 in guiding the arc towards the grid plate assembly 42. The arc-extinguishing grid plate 422 can be made of high-permeability materials such as silicon steel sheets or iron-nickel alloys. Low magnetic resistance generates a magnetic attraction force pointing towards the arc-extinguishing grid plate 422 to attract the arc. In addition, when the moving contact 3, stationary contact 2 and arc-starting plate 11 carry the electric arc, they will generate a magnetic field around themselves. The electric arc of the charged particle flow will be subjected to a Lorentz force perpendicular to the direction of the current and the magnetic field in the above magnetic field. Optimize the angle orientation of the moving contact 3, stationary contact 2 and arc-starting plate 11 to ensure that the Lorentz force drives the electric arc to move towards the grid plate group 42.

[0027] Please refer to Figure 1 and Figure 4 The arc-extinguishing chamber 4 also includes arc-isolating plates 41, with grid plate groups 42 disposed between adjacent arc-isolating plates 41. The arc-isolating plates 41 form a semi-enclosed arc-extinguishing space, confining the electric arc within the arc-extinguishing chamber 4. In some embodiments, the arc-isolating plates 41 may be made of DMC or epoxy glass cloth to withstand arc radiation heat and direct stress impact.

[0028] Preferably, the arc-blocking plate 41 has a mounting hole 411. The arc-extinguishing grid plate 422 has an extension 424 that extends into the mounting hole 411, and the two arc-blocking plates 41 cooperate to tighten and fix the position of the arc-extinguishing plate.

[0029] Please refer to Figure 1 and Figure 4 Along the arrangement direction of the arc-extinguishing grid plates 422, a notch (not shown in the figure) is provided on the side of the arc-extinguishing grid plate 422 near the moving contact 3. The notches on multiple arc-extinguishing grid plates 422 combine to form a groove 425. Correspondingly, the guide portion 423 extends into the groove 425 and is arranged along the length direction of the groove 425. The moving path of the end of the moving contact 3 is set in the groove 425, so that the arc on the moving contact 3 can directly jump to the middle position of the arc-extinguishing grid plate 422 and then move towards both ends of the arc-extinguishing grid plate 422. The arc-extinguishing grid plate 422 absorbs the energy of the arc more quickly, increasing the arc extinguishing speed.

[0030] Preferably, the arc-extinguishing chamber 4 further includes two insulating members 43, which respectively cover the sidewall of the groove 425 and the end face of the grid assembly 42 where the groove 425 is formed. The insulating members 43 form the sidewall of the arc-extinguishing chamber 4, confining the arc within the arc-extinguishing chamber 4. At the same time, the insulating members 43 cooperate with the arc-extinguishing chamber 4 to further clamp and fix the position of the grid assembly 42, enhancing the structural stability of the arc-extinguishing chamber 4.

[0031] More preferably, the bottom surface of the groove 425 is arranged along the moving path of the moving contact 3 to reduce the distance between the grid plate group 42 and the moving contact 3, so that the electric arc on the moving contact 3 can jump to the grid plate group 42.

[0032] Please refer to Figure 1 and Figure 4 One end of the insulating member 43 contacts the stationary contact 2, and the other end of the insulating member 43 extends to form a latch 431, which contacts the surface of the arc-blocking plate 41 away from the stationary contact 2. Specifically, the latch 431 includes a first section perpendicular to the arc-blocking plate 41 and a second section parallel to the arc-blocking plate 41. The second section engages with the insulating member 43 to clamp the arc-blocking plate 41. Preferably, an insulating extension 432 extends from one end of the insulating member 43 that contacts the stationary contact 2. The stationary contact 2 is disposed between the insulating extensions 432 of the two insulating members 43. A step (not shown in the figure) is formed between the insulating extension 432 and the main body of the insulating member 43. The two steps cooperate with each other to limit the stationary contact 2 and improve the stability of the stationary contact 2.

[0033] More preferably, a slot (not shown in the figure) is provided on the circuit breaker housing 1 for the insulation extension 432 to extend into. The insulation extension 432 extends into the slot, limits the position between the insulating member 43 and the circuit breaker housing 1, and fixes the insulation extension 432 on the circuit breaker housing 1 with the buckle 431.

[0034] The specific workflow of this utility model is as follows: When the moving contact 3 and the stationary contact 2 separate to generate an arc, as the moving contact 3 rotates, the end of the arc connected to the stationary contact 2 is influenced by Lorentz force and magnetic attraction, moving along the arc-initiating plate 11 towards the grid plate group 42, and jumping onto the grid plate group 42. The end of the arc connected to the moving contact 3 moves closer to the first grid plate 421 as the moving contact 3 rotates, until the distance from the moving contact 3 to the guide portion 423 is less than a preset distance. At this point, the arc end on the moving contact 3 jumps onto the guide portion 423, and the entire arc moves onto the grid plate group 42. The guide portion 423 is positioned close to multiple arc-extinguishing grid plates 422, guiding the arc to move onto other arc-extinguishing grid plates 422. The entire arc is divided into small segments of arc between different arc-extinguishing grid plates 422, while the arc-extinguishing grid plates 422 absorb the energy of the arc, thus extinguishing the arc.

[0035] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0036] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A novel arc-extinguishing system for circuit breakers, installed within the circuit breaker housing, characterized in that, The new circuit breaker arc extinguishing system includes an arc-initiating plate, an arc-extinguishing chamber disposed in the breaking area of ​​the moving contact and the stationary contact, and a grid plate assembly; one end of the arc-initiating plate is connected to the stationary contact, and the other end of the arc-initiating plate is disposed towards the grid plate assembly; the grid plate assembly is disposed in the arc-extinguishing chamber, and the grid plate assembly includes multiple arc-extinguishing grid plates arranged in layers; the outermost arc-extinguishing grid plate of the grid plate assembly is the first grid plate in the direction away from the stationary contact; a guide portion extends from the first grid plate along the arrangement path of the arc-extinguishing grid plates in the direction closer to the stationary contact.

2. The novel circuit breaker arc extinguishing system as described in claim 1, characterized in that: The arc-extinguishing chamber also includes an arc-blocking plate, and the grid plate group is disposed between adjacent arc-blocking plates.

3. The novel circuit breaker arc extinguishing system as described in claim 2, characterized in that: The arc-blocking plate has mounting holes; the arc-extinguishing grid plate has an extension that extends into the mounting holes.

4. The novel circuit breaker arc extinguishing system as described in claim 2, characterized in that: Along the arrangement direction of the arc-extinguishing grid plates, a notch is provided on the side of the arc-extinguishing grid plate near the moving contact, and the notches on multiple arc-extinguishing grid plates are combined to form a groove; the moving path of the end of the moving contact is within the groove.

5. The novel circuit breaker arc extinguishing system as described in claim 4, characterized in that: The arc-extinguishing chamber also includes two insulating components, which respectively cover the sidewall of the groove and the end face of the grid assembly where the groove is formed.

6. The novel circuit breaker arc extinguishing system as described in claim 5, characterized in that: One end of the insulating component contacts the stationary contact, and the other end of the insulating component extends to form a buckle that contacts the surface of the arc-blocking plate away from the stationary contact.

7. The novel circuit breaker arc extinguishing system as described in claim 5, characterized in that: An insulating extension is provided at one end of the insulating member that contacts the stationary contact; the stationary contact is disposed between the insulating extensions of the two insulating members.

8. The novel circuit breaker arc extinguishing system as described in claim 7, characterized in that: The circuit breaker housing has a slot for the insulation extension to extend into.

9. The novel circuit breaker arc extinguishing system as described in claim 4, characterized in that: The bottom surface of the groove is arranged along the moving path of the moving contact.

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