An arc extinguishing chamber arc striking structure and arc extinguishing chamber thereof

Abstract

The utility model discloses an arc extinguishing chamber arc leading structure and arc extinguishing chamber thereof, including setting in the circuit breaker's phase interval channel and setting in the phase interval channel's static contact, wiring board and arc leading component, and wiring board is equipped with the slot hole of going through in static contact position correspondence, and the installation clamping groove of positioning connection arc leading component is equipped in the phase interval channel, and wiring board is installed in the phase interval channel and is pressed tightly arc leading component, and this arc leading component extends through the slot hole and is close to and opposite setting with static contact. Adopt the static contact and arc leading component of this technique scheme and adopt modularization separation design, and installation structure is simple, and the convenient assembly dismounts, has reduced maintenance cost, and the path of arc from static contact to arc leading component has been optimized through the short distance arc leading design, can more fast, more reliable arc is introduced into arc extinguishing grid piece and is divided, cools and extinguishes, reduces arc burning, indirectly promotes the breaking capacity and life of circuit breaker.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, specifically to an arc-extinguishing chamber arc-starting structure and its arc-extinguishing chamber. Background Technology

[0002] In molded case circuit breakers, an arc-extinguishing chamber is usually installed inside to extinguish the electric arc generated by the contacts in the electrical equipment, so as to ensure the safe operation of the electrical equipment. In particular, DC molded case circuit breakers are more difficult to interrupt DC short-circuit currents, especially high-voltage DC short-circuit currents. The function of the arc-extinguishing chamber is to eliminate the electric arc generated during interruption. When a large current is interrupted between the moving and stationary contacts and an arc is generated, the arc will be pulled into the arc-extinguishing plate under the contraction force of the magnetic lines of force, dividing a long arc into multiple short arcs, which can cool the arc and also cool and deionize the arc-extinguishing gas, thereby achieving the arc-extinguishing effect. The existing arc-extinguishing chamber structure mainly includes an arc-extinguishing chamber body, several arc-extinguishing grid plates, an upper arc-leading plate, a lower arc-leading plate, and an arc-isolating sleeve. The arc-extinguishing grid plates are arranged longitudinally at intervals in the arc-extinguishing chamber, and the upper and lower arc-leading plates are distributed on the upper and lower sides of the arc-extinguishing grid plates. The arc-isolating sleeve is arranged at the arc-leading opening of the arc-extinguishing chamber body. The moving and stationary contacts cooperate to contact or separate in the arc-leading opening. The upper arc-leading plate has an arc-leading angle extending into the arc-leading opening and close to the moving contact. The lower arc-leading plate is usually directly fixed to the stationary contact by riveting, thus riveting the stationary contact and the lower arc-leading plate into a whole. Although it can play the role of arc ignition, it also has the following problems: This riveting process is complex. Under the mechanical vibration and impact generated by the circuit breaker opening and closing operation, the riveting point of the lower arc-leading plate may loosen or move slightly. In addition, local high temperature will be generated when large current passes through it. Vibration and high temperature will lead to increased contact resistance. Furthermore, the riveted lower arc-leading plate is difficult to replace individually after damage, resulting in high maintenance costs. Utility Model Content

[0003] Therefore, the technical problem to be solved by this utility model is to overcome the problem that the static contact and the lower arc plate are riveted into a whole in the prior art. This riveting process is complicated, the maintenance cost is high, and the riveting point of the lower arc plate is easily loosened or slightly moved under mechanical vibration and impact.

[0004] To solve the above-mentioned technical problems, this utility model provides an arc-initiating structure for an arc-extinguishing chamber, which works in conjunction with the arc-extinguishing chamber to attract the arc on one side of the stationary contact. It includes a phase-to-phase channel disposed in the circuit breaker and a stationary contact, a terminal block, and an arc-initiating component disposed in the phase-to-phase channel. The stationary contact is formed on one end of the terminal block and located at the bottom of the arc-extinguishing chamber. The terminal block has a slotted hole corresponding to the position of the stationary contact. The phase-to-phase channel has a mounting slot for positioning and connecting the arc-initiating component. When the terminal block is installed in the phase-to-phase channel, it presses the arc-initiating component to form a limiting fit. The arc-initiating component extends upward through the slotted hole and is disposed at the bottom of the arc-extinguishing chamber, with its end close to and opposite to the stationary contact.

[0005] In the arc-quenching chamber arc-ignition structure described above, the arc-ignition component includes a base plate portion vertically inserted into the mounting slot, and an arc-ignition plate portion extending upward from the base plate portion through the slotted hole and disposed near the stationary contact. The arc-ignition plate portion is used to guide the arc into the arc-quenching grid area of ​​the arc-quenching chamber.

[0006] In the arc-quenching chamber arc-initiating structure described above, the arc-initiating plate has an inclined, raised arc-guide angle.

[0007] In the arc-extinguishing chamber arc-ignition structure described above, the arc-ignition component includes two limiting steps formed between the base plate and the arc-ignition plate. The base plate and the arc-ignition plate are connected in a T-shaped structure. The wiring plate has two guide arms formed on both sides of the slotted hole, and the two guide arms press against the two limiting steps respectively to form a limiting fit with the arc-ignition component.

[0008] In the arc-extinguishing chamber arc-ignition structure described above, the phase-to-phase channel has a groove area corresponding to the position of the stationary contact, and a support boss structure is provided in the groove area to support and connect the stationary contact and the terminal block. The support boss structure is partially inserted into the slotted hole and has a positioning slot. The arc-ignition component is snapped into the positioning slot by the base plate and is limited and fixed between the support boss structure and the terminal block.

[0009] In the arc-extinguishing chamber arc-ignition structure described above, the supporting boss structure includes a first boss extending and connected to the side walls of the phase-interval channel, a second boss formed in an L-shape on one side of the first boss, and a positioning groove formed between the first boss and the second boss. The base plate portion has a recessed portion that engages with the positioning groove and two limiting feet formed on both sides of the recessed portion. The two limiting feet respectively engage and clamp on both sides of the second boss.

[0010] In the arc-extinguishing chamber arc-initiating structure described above, the first boss includes a first support portion that penetrates into the slotted hole and abuts against the stationary contact, and two second support portions that are flush with both sides of the first support portion. The two second support portions are set lower than the first support portion, and the two guide arms of the terminal block extend and abut against the two second support portions.

[0011] In the arc-extinguishing chamber arc-initiating structure described above, the stationary contact is inclined toward the slotted hole, and the first support part is provided with an inclined support surface that cooperates with the stationary contact, so that a multi-level stepped structure with progressively decreasing height is formed between the inclined support surface, the first support part and the second support part.

[0012] This utility model also provides an arc-extinguishing chamber, which is installed inside a circuit breaker and includes the arc-extinguishing chamber arc-starting structure described in any one of the above-mentioned methods.

[0013] Compared with the prior art, the technical solution of this utility model has the following advantages: 1. In the arc-extinguishing chamber arc-ignition structure provided by this utility model, the arc-ignition component is first initially positioned by being inserted into the phase-to-phase slot through an installation slot. Then, during installation, the arc-ignition component is pressed against the terminal block to form a secondary limiting position, thus constructing a dual fixing structure of slot positioning and surface contact pressing. This effectively resists the vibration and impact generated by the circuit breaker's opening and closing, ensuring the stability and reliability of the arc-ignition component's installation and connection. After installation, the arc-ignition component passes precisely through the slotted hole of the terminal block and is close to the stationary contact, ensuring that the arc-ignition component and the stationary contact always maintain the optimal distance and relative position. This close-range arc ignition design optimizes the path of arc transfer from the stationary contact to the arc ignition component, enabling the arc to be introduced into the arc-extinguishing grid for segmentation, cooling, and extinguishing more quickly and reliably, reducing arc burning and indirectly improving the breaking capacity and lifespan of the circuit breaker. The stationary contact and arc ignition component using this technology adopt a modular and separate design, which simplifies the installation structure and facilitates assembly and disassembly. When the arc ignition component is burned out due to arc ignition and needs to be replaced, the old arc ignition component can be removed and replaced separately simply by unscrewing the terminal block. This greatly reduces maintenance costs and improves maintainability.

[0014] 2. In the arc-ignition structure of the arc-extinguishing chamber provided by this utility model, the arc-ignition component mainly consists of a base plate, an arc-ignition plate, and an arc-ignition angle. The base plate is vertically inserted into the mounting slot and, in conjunction with the clamping and limiting of the wiring plate, forms a dual fixing effect of insertion and clamping, preventing the arc-ignition component from loosening and ensuring stable and reliable installation. The arc-ignition plate extends upward through the slotted hole and is close to the stationary contact, shortening the distance between the stationary contact and the arc-ignition component, which is conducive to rapid arc ignition, reduces the residence time of the arc near the stationary contact, reduces the erosion of the stationary contact, and utilizes the inclined and raised arc-guided angle to actively change the direction of arc movement, making it more closely match the arrangement angle of the arc-extinguishing grid, reducing energy loss and path deviation of the arc during the process of entering the grid, allowing the arc to be divided, cooled, and extinguished by the grid more quickly, improving arc extinguishing efficiency and shortening arc extinguishing time.

[0015] 3. In the arc-extinguishing chamber arc-ignition structure provided by this utility model, the arc-ignition component is inserted into the mounting slot through the base plate. The wiring plate is symmetrically pressed against the two limiting steps of the arc-ignition component through two guide arms. The arc-ignition component is further fixed by the clamping force of the wiring plate, forming a double-sided symmetrical force structure. This prevents the arc-ignition component from being dislodged from the mounting slot due to vibration or tilting caused by unilateral force. The force is more balanced, improving the vibration and impact resistance. The guide arms of the wiring plate are conductive components. They form a conductive connection with the limiting steps of the arc-ignition component through surface contact, ensuring stable electrical performance.

[0016] 4. In the arc-extinguishing chamber provided by this utility model, the arc-initiating component is independently installed on the support boss of the phase-to-phase channel relative to the stationary contact. This facilitates installation and maintenance. Through the synergistic guiding effect of the inclined arc-guiding angle of the arc-initiating component and the inclined support surface of the support boss, when the circuit breaker trips, a portion of the arc generated between the stationary and moving contacts gathers towards the end of the stationary contact. It is then captured and guided by the arc-guiding angle of the arc-initiating plate and quickly enters the arc-extinguishing grid area along the inclined angle. This shortens the residence time of the arc between the contacts, reduces direct erosion of key components such as the stationary contact and terminal block, and extends the service life of the arc-extinguishing chamber. Attached Figure Description To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the installation of the arc-extinguishing chamber provided by this utility model; Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure along line AA, showing the arc-quenching structure of the arc-extinguishing chamber; Figure 3 This is a schematic diagram of the installation structure of the arc-extinguishing chamber arc-starting structure of this utility model; Figure 4 for Figure 3 The diagram shows the structure of the arc-extinguishing chamber's arc-starting structure after the wiring board is hidden. Figure 5 This is a schematic diagram of the terminal block and stationary contact of this utility model; Figure 6 This is a schematic diagram of the arc-starting component of this utility model.

[0018] Explanation of reference numerals in the attached drawings: 1. Stationary contact; 2. Terminal block; 21. Slotted hole; 22. Guide arm; 3. Arc-starting component; 31. Base plate; 32. Arc-starting plate; 33. Guide angle; 34. Notch; 35. Limiting foot; 4. Interphase channel; 5. Mounting slot; 6. Support boss structure; 61. First boss; 62. Second boss; 63. First support part; 64. Second support part; 65. Inclined support surface; 7. Arc-extinguishing chamber. Detailed Implementation

[0019] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0020] In the description of this utility model, it should be noted that the terms "first", "second" and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0023] Example The following is a detailed description of this embodiment with reference to the accompanying drawings: This embodiment provides, as follows: Figure 1-6 The diagram illustrates an arc-initiating structure for an arc-extinguishing chamber, which works in conjunction with an arc-extinguishing chamber 7 to attract the electric arc on one side of the stationary contact 1. It includes a phase-to-phase channel 4 within the circuit breaker, a stationary contact 1, a terminal block 2, and an arc-initiating component 3 disposed within the phase-to-phase channel 4. The stationary contact 1 is formed at one end of the terminal block 2 and located at the bottom of the arc-extinguishing chamber 7. The terminal block 2 has a slotted hole 21 corresponding to the position of the stationary contact 1. The phase-to-phase channel 4 has a mounting slot 5 for positioning and connecting the arc-initiating component 3. When the terminal block 2 is installed in the phase-to-phase channel 4, it presses against the arc-initiating component 3 to form a limiting fit. The arc-initiating component 3 extends upward through the slotted hole 21 and is disposed at the bottom of the arc-extinguishing chamber 7, with its end close to and opposite to the stationary contact 1.

[0024] The above-described implementation method is the core technical solution of this embodiment. During installation, the arc-initiating component 3 is first inserted into the phase-to-phase slot 4 through the mounting slot 5 to achieve initial positioning. Then, the arc-initiating component 3 is pressed together by the terminal block 2 during installation to form a secondary limiting position, thereby constructing a dual fixing structure of slot positioning and surface contact pressing. This effectively resists the vibration and impact generated by the opening and closing of the circuit breaker, ensuring the stability and reliability of the arc-initiating component 3 installation connection. After installation, the arc-initiating component 3 passes exactly through the slot 21 of the terminal block 2 and is close to the stationary contact 1, ensuring that the arc-initiating component 3 and the stationary contact 1 always maintain optimal contact. By optimizing the distance and relative position, this close-range arc ignition design improves the path of arc transfer from the stationary contact 1 to the arc ignition component 3. This allows the arc to be introduced into the arc-extinguishing grid for segmentation, cooling, and extinguishing more quickly and reliably, reducing arc burning and improving the breaking capacity and lifespan of the circuit breaker. The stationary contact 1 and the arc ignition component 3 using this technology adopt a modular and separate design, which simplifies the installation structure and facilitates assembly and disassembly. When the arc ignition component is burned out due to arc ignition and needs to be replaced, the old arc ignition component can be removed and replaced separately simply by removing the terminal block. This greatly reduces maintenance costs and improves maintainability.

[0025] The following is combined Figure 3-6 The specific configuration of the arc-initiating component is described in detail below: The arc-initiating component 3 includes a base plate portion 31 that is vertically inserted into the mounting slot 5, and an arc-initiating plate portion 32 that extends upward from the base plate portion 31 through the slot 21 and is disposed near the stationary contact 1. The arc-initiating plate portion 32 has an inclined arc-guiding angle 33, and is used to guide the arc into the arc-extinguishing grid area of ​​the arc-extinguishing chamber 7. In this structural configuration, the arc-initiating component 3 mainly consists of a base plate 31, an arc-initiating plate 32, and an arc-initiating angle. The base plate 31 is vertically inserted into the mounting slot 5 and, in conjunction with the clamping and limiting action of the wiring plate 2, forms a dual fixing effect of insertion and clamping, ensuring the stable and reliable installation of the arc-initiating component 3. The arc-initiating plate 32 extends upward through the slotted hole 21 and is designed to be close to the stationary contact 1, shortening the distance between the stationary contact 1 and the arc-initiating component. This facilitates rapid arc initiation, reduces the residence time of the arc near the stationary contact 1, and reduces the ablation of the contact. Furthermore, the inclined and raised arc-guided angle 33 can actively change the direction of arc movement, making it more closely match the arrangement angle of the arc-extinguishing grid. This reduces energy loss and path deviation of the arc during its entry into the grid, allowing the arc to be divided, cooled, and extinguished by the grid more quickly, improving arc-extinguishing efficiency and shortening arc-extinguishing time.

[0026] In a further preferred configuration, the arc-initiating component 3 includes two limiting steps formed between the base plate portion 31 and the arc-initiating plate portion 32. The base plate portion 31 and the arc-initiating plate portion 32 are connected in a T-shape. The terminal block 2 has two guide arms 22 formed on both sides of the slotted hole, and the two guide arms 22 press against the two limiting steps to form a limiting fit with the arc-initiating component 3. The advantage of this design is that the arc-initiating component 3 is inserted into the mounting slot 5 through the base plate portion 31, and the terminal block 2 presses symmetrically against the two limiting steps of the arc-initiating component 3 through the two guide arms 22. The clamping force of the terminal block 2 further fixes the arc-initiating component 3, forming a symmetrical force-bearing structure on both sides. This prevents the arc-initiating component 3 from being dislodged from the mounting slot 5 due to vibration or tilting caused by unilateral force, resulting in a more balanced force and improved vibration and impact resistance. The guide arms 22 of the terminal block 2 are conductive components, and they form a conductive connection with the limiting steps of the arc-initiating component through surface contact, ensuring stable electrical performance.

[0027] Combination Figure 3-4 As shown, the phase-interval channel 4 has a groove area corresponding to the position of the stationary contact 1, and a support boss structure 6 is provided in the groove area to support and connect the stationary contact 1 and the terminal block 2. The support boss structure 6 is partially inserted into the slotted hole 21 and has a positioning slot. The arc-starting component 3 is snapped into the positioning slot through the base plate part 31 and is limited and fixed between the support boss structure 6 and the terminal block 2. As a specific structural setting, the support boss structure 6 includes a first boss 61 extending and connected to the side walls of both sides of the phase-interval channel 4, a second boss 62 formed in an L shape on one side of the first boss 61, and a positioning slot formed between the first boss 61 and the second boss 62. The base plate part 31 has a notch part 34 that engages with the positioning slot and two limiting feet 35 formed on both sides of the notch part 34. The two limiting feet 35 are respectively engaged and clamped on both sides of the second boss 62. In this structural configuration, the arc-initiating component 3 forms a double-locking installation structure through the engagement of the recess 34 with the positioning slot and the clamping engagement of the two limiting feet 35 with the second boss 62, ensuring the stability of the arc-initiating component 3 during installation. In this structural configuration, the supporting boss structure 6 provides support for the terminal block 2 and the stationary contact 1. The terminal block 2 presses the arc-initiating component 3 with the guide arm 22. The arc-initiating component 3 is fixed to the supporting boss through the recess and the limiting feet. The three components constrain and support each other, improving the connection strength and enhancing the overall connection reliability.

[0028] In a further preferred configuration, the first boss 61 includes a first support portion 63 that penetrates the slotted hole and abuts against the stationary contact 1, and two second support portions 64 that are flush with both sides of the first support portion 63. The two second support portions 64 are set lower than the first support portion 63. The two guide arms 22 of the terminal block 2 extend and abut against the two second support portions 64. The inclined support surface 65 of the first support portion 63 is designed to form a close fit support with the contour of the stationary contact 1, avoiding deformation of the stationary contact 1 caused by local stress concentration. The two second support portions 64 are distributed on both sides of the first support portion 63 and abut against the two guide arms 22 of the terminal block 2 to form a symmetrical support, ensuring that the clamping force of the guide arms 22 on the arc-initiating component 3 is balanced from left to right, preventing the arc-initiating component 3 from tilting due to excessive force on one side, and further enhancing the installation stability of the arc-initiating component 3. The stationary contact 1 is inclined toward the slotted hole. The first support 63 is provided with an inclined support surface 65 that cooperates with the stationary contact 1, so that the inclined support surface 65, the first support 63 and the second support 64 form a multi-level stepped structure with decreasing height. This stepped design makes the cross-section of the first boss 61 thicken in a stepped manner. Compared with a single plane support, its bending and shear resistance is significantly improved. Although the second support 64 is lower in height, it forms a mechanical buffer through the stepped transition with the first support 63. When the guide arm transmits vibration or impact force, the stepped structure can disperse the force along the height direction (transmitted step by step from high to low), avoiding the force from concentrating on a certain plane and causing the support to break, thus enhancing the overall impact resistance.

[0029] Example 2 This embodiment provides, as follows: Figure 1 An arc-extinguishing chamber 7, as shown, is installed inside a circuit breaker and includes the arc-extinguishing chamber arc-initiating structure described in Embodiment 1. The arc-extinguishing chamber 7 of this embodiment is provided with the arc-extinguishing chamber arc-initiating structure as described above, and therefore naturally has all the advantages brought about by the above-mentioned moving contact device. According to the fact that the arc-initiating component 3 is independently installed on the support boss of the phase-to-phase channel 4 relative to the stationary contact 1, it is easy to install and easy to maintain. The inclined arc-guiding angle 33 of the arc-initiating component 3 and the inclined support surface 65 of the support boss form a synergistic guiding effect. When the circuit breaker is opened, part of the arc generated between the stationary contact 1 and the moving contact gathers towards the end of the stationary contact 1, and is then captured and guided by the arc-guiding angle 33 of the arc-initiating plate 32, and quickly enters the arc-extinguishing grid area along the inclined angle, shortening the residence time of the arc between the contacts, reducing the direct ablation of key components such as the stationary contact and the terminal block, and extending the service life of the arc-extinguishing chamber.

[0030] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. An arc-initiating structure for an arc-extinguishing chamber, which cooperates with an arc-extinguishing chamber (7) to attract an electric arc on one side of a stationary contact (1), comprising a phase-to-phase channel (4) disposed in a circuit breaker and a stationary contact (1), a terminal block (2), and an arc-initiating component (3) disposed in the phase-to-phase channel (4), wherein the stationary contact (1) is formed at one end of the terminal block (2) and located at the bottom of the arc-extinguishing chamber (7), and the terminal block (2) is provided with a slotted hole (21) corresponding to the position of the stationary contact (1), characterized in that: The interphase channel (4) is provided with a mounting slot (5) for positioning and connecting the arc-starting component (3). When the terminal block (2) is installed in the interphase channel (4), it presses the arc-starting component (3) to form a limiting fit. The arc-starting component (3) extends upward through the slotted hole (21) and is located at the bottom of the arc-extinguishing chamber (7). Its end is close to and opposite to the stationary contact (1).

2. The arc-extinguishing chamber arc-starting structure according to claim 1, characterized in that: The arc-initiating component (3) includes a base plate portion (31) vertically inserted into the mounting slot (5), and an arc-initiating plate portion (32) extending upward from the base plate portion (31) through the slot (21) and located near the stationary contact (1). The arc-initiating plate portion (32) is used to guide the arc into the arc-extinguishing chamber (7) arc-extinguishing grid area.

3. The arc-extinguishing chamber arc-starting structure according to claim 2, characterized in that: The arc-leading plate (32) has an inclined, raised arc-leading angle (33).

4. The arc-extinguishing chamber arc-starting structure according to claim 3, characterized in that: The arc-starting component (3) includes two limiting steps formed between the base plate portion (31) and the arc-starting plate portion (32). The base plate portion (31) and the arc-starting plate portion (32) are connected in a T-shaped structure. The wiring plate (2) has two guide arms (22) formed on both sides of the slotted hole, and the two guide arms (22) press against the two limiting steps respectively to form a limiting fit with the arc-starting component (3).

5. The arc-quenching chamber arc-starting structure according to any one of claims 1-4, characterized in that: The interphase channel (4) has a groove area corresponding to the position of the stationary contact (1), and a support boss structure (6) is provided in the groove area to support and connect the stationary contact (1) and the terminal block (2). The support boss structure (6) is partially inserted into the slotted hole (21) and has a positioning slot. The arc-inducing component (3) is inserted into the positioning slot through the base plate part (31) and is limited and fixed between the support boss structure (6) and the terminal block (2).

6. The arc-extinguishing chamber arc-starting structure according to claim 5, characterized in that: The supporting boss structure (6) includes a first boss (61) extending to connect with the side walls of the alternating channel (4) and a second boss (62) formed in an L shape on one side of the first boss (61), and a positioning groove formed between the first boss (61) and the second boss (62). The base plate portion (31) has a recess portion (34) that engages with the positioning groove and two limiting feet (35) formed on both sides of the recess portion (34). The two limiting feet (35) respectively engage and clamp on both sides of the second boss (62).

7. The arc-extinguishing chamber arc-starting structure according to claim 6, characterized in that: The first boss (61) includes a first support part (63) that passes through the slotted hole and abuts against the stationary contact (1), and two second support parts (64) that are flush with the first support part (63) on both sides. The two second support parts (64) are set lower than the first support part (63), and the two guide arms (22) of the terminal block (2) extend and abut against the two second support parts (64).

8. The arc-extinguishing chamber arc-starting structure according to claim 7, characterized in that: The stationary contact (1) is inclined toward the slotted hole. The first support part (63) is provided with an inclined support surface (65) that cooperates with the stationary contact (1), so that a multi-level stepped structure with decreasing height is formed between the inclined support surface (65), the first support part (63) and the second support part (64).

9. An arc-extinguishing chamber, disposed within a circuit breaker, characterized in that, The arc-extinguishing chamber arc-starting structure includes any one of claims 1-8.

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