Integrated arc extinguishing and arc suppressing device and circuit breaker with same

Abstract

This utility model discloses an integrated arc extinguishing and arc suppression device and a circuit breaker having the same, including an arc extinguishing chamber unit and an arc suppression chamber unit. The arc suppression chamber unit is integrally connected to the arc extinguishing chamber unit through a set of mounting side plates, and an extension baffle is formed by the set of mounting side plates extending towards the circuit breaker wiring port. The mounting side plates and the extension baffles are integrally formed to constitute the side walls of the arc extinguishing chamber unit and the arc suppression chamber unit, respectively. In this integrated structure, the ends of the extension baffles directly cover the inner walls on both sides of the wiring port, forming a continuous arc extinguishing cavity and an arc suppression cavity, completely eliminating the gaps caused by assembly, structurally blocking the path of arc escape, and improving the overall arc extinguishing and arc suppression efficiency. The integrated arc extinguishing chamber and arc suppression chamber structure significantly compresses redundant space, improves the internal layout compactness without increasing the overall volume of the circuit breaker, and significantly improves the cabinet space utilization rate.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical technology, specifically to an integrated arc extinguishing device and a circuit breaker having the same. Background Technology

[0002] As a crucial electrical device protecting circuit systems, molded case circuit breakers (MCCBs) actively interrupt current when faults such as short circuits, overloads, and undervoltage occur, thus protecting the power distribution system, electrical equipment, and the safety of personnel. However, when interrupting fault current, a high-temperature arc is generated between the moving and stationary contacts. This arc is extinguished by the arc-starting plates and magnetic blow-out effect, which guide the arc into the arc-extinguishing chamber within the circuit breaker. In practice, due to the large interrupting current, a small amount of charged ionized gas or residual arc may still be ejected from the arc-extinguishing chamber under the influence of airflow. These residual arcs can then propel themselves along the air ducts towards the circuit breaker's terminals. The ejected arcs, carrying high-temperature metal particles, can splash onto the outside of the circuit breaker, potentially causing short circuits or burnouts in surrounding circuits.

[0003] The current practice involves installing a zero-arc shroud at the circuit breaker terminals to extinguish arc gas and block metal particles. This shroud is fixed to the circuit breaker terminals with screws and includes multiple mounting chambers and multiple arc-extinguishing plates installed in each chamber, allowing arc gas to be discharged after being extinguished by the multiple arc-extinguishing plates. However, the existing zero-arc shroud has a complex installation structure and a large overall size. After installation, it significantly increases the length and volume of the circuit breaker, reduces the space utilization of the product within the cabinet, and allows tiny arcs to easily penetrate the installation gap between the shroud and the terminals, resulting in a less than ideal arc-extinguishing effect. Utility Model Content

[0004] Therefore, the technical problem to be solved by this utility model is to overcome the problems in the prior art where installing a zero-arc cover at the terminal position of the circuit breaker will significantly increase the length and volume of the circuit breaker product, make the installation structure complicated, and allow tiny electric arcs to easily penetrate the installation gap between the cover and the terminal and escape, resulting in an unsatisfactory arc suppression effect.

[0005] To address the aforementioned problems, this utility model provides an integrated arc extinguishing and suppression device, which is installed and integrated within a circuit breaker, comprising:

[0006] The arc-extinguishing chamber unit is equipped with an arc-extinguishing plate assembly for interrupting the electric arc, and the front end of the arc-extinguishing plate assembly is provided with an arc-initiating port structure.

[0007] An arc-extinguishing chamber unit is provided with an arc-extinguishing plate group located at the rear end of the arc-extinguishing plate group. The arc-extinguishing chamber unit is integrally connected to the arc-extinguishing chamber unit through a set of mounting side plates.

[0008] A set of extended baffles, formed by the set of mounting side plates extending toward the circuit breaker terminal, with their ends covering the inner walls on both sides of the circuit breaker terminal.

[0009] The mounting side plate and the extension baffle are integrally formed to constitute the side wall of the arc extinguishing chamber unit and the side wall of the arc extinguishing chamber unit, respectively, so that the arc extinguishing chamber unit and the arc extinguishing chamber unit form a continuous and interconnected arc extinguishing cavity and arc extinguishing cavity. The arc extinguishing plate group is arranged vertically in the arc extinguishing cavity and the arc extinguishing plate group is arranged horizontally in the arc extinguishing cavity.

[0010] In the aforementioned integrated arc extinguishing and arc suppression device, the arc extinguishing plate group and the arc suppression plate group are housed in the gas duct structure of the circuit breaker. The gas duct structure extends from the contact shaft position of the circuit breaker to the wiring port. The height of the arc extinguishing cavity is greater than the height of the arc suppression cavity, forming a stepped expansion structure.

[0011] In the aforementioned integrated arc extinguishing device, the arc extinguishing plate group is a multi-layer stacked structure, which includes multiple arc extinguishing grid plates arranged at intervals along the vertical direction between a set of mounting side plates.

[0012] In the aforementioned integrated arc extinguishing device, the arc extinguishing plate group includes multiple arc extinguishing grid plates arranged at intervals along the horizontal direction between a set of extended baffles, and each arc extinguishing grid plate has through holes evenly distributed in a matrix.

[0013] In the aforementioned integrated arc extinguishing device, multiple arc extinguishing grids are spaced apart in the wiring port, and the spacing between the multiple arc extinguishing gaps gradually decreases from the inside to the outside along the arrangement direction of the arc extinguishing grids.

[0014] In the aforementioned integrated arc extinguishing device, the circuit breaker includes a base and a middle cover, and an air duct structure and a wiring port formed between the base and the middle cover. The arc extinguishing chamber unit is disposed in the air duct structure, and the arc extinguishing chamber unit is disposed in the wiring port.

[0015] In the aforementioned integrated arc extinguishing device, the air duct structure includes a lower air duct horizontally connected to the wiring port, an upper air duct vertically connected above the lower air duct, and an upper exhaust port disposed on the middle cover and connected to the upper air duct. The arc extinguishing plate assembly includes an upper arc extinguishing layer and a lower arc extinguishing layer composed of multiple arc extinguishing grid plates and respectively housed in the lower air duct and the lower air duct. The lower arc extinguishing layer is disposed opposite to the arc extinguishing plate assembly and opposite to the upper exhaust port, and multiple arc extinguishing isolation plates are disposed in the upper exhaust port.

[0016] In the aforementioned integrated arc extinguishing and arc suppression device, the arc extinguishing chamber and the arc suppression chamber are connected to the wiring port to form the main exhaust channel; the arc extinguishing chamber and the air passage structure are connected to the upper exhaust port to form the secondary exhaust channel.

[0017] This utility model also provides a circuit breaker, including a wiring port and a gas passage structure disposed in the circuit breaker housing, and an integrated arc extinguishing device using any one of the above-mentioned methods. The arc extinguishing plate group is disposed in the gas passage structure and located behind the contact breaking point, and the arc extinguishing plate group is disposed in the wiring port and located behind the arc extinguishing plate group.

[0018] Compared with the prior art, the technical solution of this utility model has the following advantages:

[0019] 1. In the integrated arc extinguishing and arc suppression device provided by this utility model, the arc extinguishing chamber unit and the arc suppression chamber unit are integrally connected by a mounting side plate. The mounting side plate and the extension baffle are integrally formed, eliminating the need for additional fixing components. It can be directly installed and integrated into the circuit breaker, greatly simplifying the installation process and avoiding the increase in volume caused by additional components. This improves the space utilization rate of the circuit breaker within the cabinet. In this integrated structure, the extension baffle is formed by extending from the mounting side plate, and its end directly covers the inner walls of both sides of the wiring port. Combined with the continuous arc extinguishing and arc suppression cavity structure, it completely eliminates gaps caused by assembly, structurally blocking the path of arc escape and enhancing the interception effect of high-temperature arcs and metal particles. This design first interrupts the electric arc by arranging arc-extinguishing plates in the arc-extinguishing chamber. Then, residual arcs and particles can directly enter the arc-extinguishing chamber and be further extinguished by the arc-extinguishing plates, forming a continuous "arc extinguishing-arc suppression" process. This improves the overall arc extinguishing efficiency, significantly enhances the ability to intercept high-temperature arcs and metal particles, protects surrounding electrical components, reduces the probability of short circuits and insulation damage, and improves product lifespan and reliability. The integrated arc-extinguishing chamber and arc-suppression chamber structure of this technical solution significantly compress redundant space. Without increasing the overall size of the circuit breaker, it improves the internal layout compactness, significantly increases the cabinet space utilization rate, and adapts to the cabinet installation needs of more scenarios.

[0020] 2. In the integrated arc extinguishing and arc suppression device provided by this utility model, the side walls of the arc extinguishing chamber unit and the arc suppression chamber unit are formed by an integrally molded mounting side plate and an extension baffle, thereby forming a continuous structural frame. Compared with the traditional spliced ​​zero-arc cover, the structure is more rigid and is less prone to deformation and displacement under conditions such as arc impact and long-term operating vibration, ensuring the stability of arc extinguishing and arc suppression. At the same time, the continuous structural frame allows the arc energy to be transferred and dissipated in an orderly manner in the enclosed space, avoiding local overheating, reducing the risk of aging and damage to the circuit breaker due to heat accumulation, and improving the service life and reliability of the product.

[0021] 3. In the integrated arc extinguishing device provided by this utility model, the matrix through holes on the arc extinguishing grid allow cooling airflow and residual electric arc to pass through. When the airflow passes through, it accelerates heat exchange, further cooling the electric arc. The "maze effect" formed by several through holes allows fine electric arcs and metal particles to continuously collide and consume energy during their passage, and even be adsorbed by the hole walls, reducing the risk of escape. Furthermore, the arc extinguishing gaps between several arc extinguishing grids are designed with a gradual gap. As the electric arc moves from the arc extinguishing chamber to the connection port, a gradient filtration is achieved from sparse to dense, allowing residual electric arcs and metal particles to be gradually captured by the arc extinguishing grids. This structural design of the arc extinguishing grids and arc extinguishing gaps follows the law of decreasing electric arc energy and shrinking particle size, allowing the arc extinguishing structure to dynamically match the characteristics of the electric arc, improving the accuracy and thoroughness of arc extinguishing.

[0022] 4. In the integrated arc extinguishing device provided by this utility model, after the arc is broken at the contact, it is initially cut by the arc extinguishing plate group and then purified by the arc extinguishing plate group. Finally, it is discharged from the terminal. This main exhaust channel, composed of the arc extinguishing chamber, the arc extinguishing chamber, and the terminal, can ensure the basic arc extinguishing requirements. However, when the arc energy is too large and the main channel cannot fully accommodate it, some of the arc will surge upward into the upper air channel. After being cut a second time by the upper arc extinguishing layer, it is finally discharged from the upper exhaust port with the arc extinguishing isolation plate. The multi-layer arc extinguishing grid cuts and cools the arc in the first instance, reducing the arc from entering the main exhaust channel. The energy propagating in the secondary flow channel is the first line of defense against arc extinguishing. Based on the arc extinguishing plate composition, it is divided into upper and lower arc extinguishing layers. The upper arc extinguishing layer, together with the arc extinguishing isolation plate at the upper exhaust port, plays a secondary role in arc extinguishing and isolation protection. This dual-channel current shunting design avoids arc rebound and insulation damage caused by single-channel congestion, and improves the adaptability of the circuit breaker to complex operating conditions. This technical solution adopts a combined structural design of dual flow channels, layered arc extinguishing, and secondary arc extinguishing, which enables the circuit breaker to handle both conventional small current breaking and short-circuit large current breaking, greatly improving the breaking capacity of the circuit breaker.

[0023] 5. The circuit breaker provided by this utility model is equipped with the moving contact device as described above, and therefore naturally possesses all the advantages brought about by the installation of the moving contact device. The arc extinguishing chamber and the arc suppression chamber are connected by the mounting side plate and the extension baffle to form a whole, so that the arc extinguishing plate group is fixed by the mounting side plate and the arc suppression plate group is fixed by the extension baffle, forming a rigid frame as a whole. It is not easy to deform or loosen under the conditions of arc impact and airflow disturbance, ensuring the stability of arc extinguishing / arc suppression function during long-term operation. It has good structural stability and is conducive to integrated installation. According to the arc extinguishing plate group, it is divided into a lower arc extinguishing layer and an upper arc extinguishing layer. The lower arc extinguishing layer is close to the contact and prioritizes cutting the high-energy initial arc. The upper arc extinguishing layer treats the upward spreading residual arc. Finally, the low-energy residual arc is intercepted by the arc suppression plate group, forming a stepped processing flow. This avoids the arc extinguishing failure of a single structure due to excessive load. The high-temperature gas is quickly discharged by the dual airflow channel, reducing the heat accumulation in the cavity and avoiding arc and gas congestion, thereby improving the arc extinguishing capacity and breaking capacity of the circuit breaker and achieving a zero arcing effect. Attached Figure Description

[0024] 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.

[0025] Figure 1 This is a three-dimensional structural diagram of the integrated arc extinguishing and arc-suppressing device of this utility model;

[0026] Figure 2 This is a schematic diagram of the integrated arc extinguishing and arc-suppressing device of this utility model from another perspective;

[0027] Figure 3 A partial cross-sectional schematic diagram of the circuit breaker provided by this utility model;

[0028] Figure 4 This is a schematic diagram of the integrated arc extinguishing and arc suppression device of this utility model installed on a circuit breaker.

[0029] Explanation of reference numerals in the attached drawings: 1. Arc-extinguishing chamber unit; 11. Arc-extinguishing cavity; 2. Arc-extinguishing chamber unit; 21. Arc-extinguishing cavity; 3. Mounting side plate; 4. Extension baffle; 5. Arc-extinguishing plate assembly; 51. Lower arc-extinguishing layer; 52. Upper arc-extinguishing layer; 6. Arc-extinguishing plate assembly; 61. Arc-extinguishing grid plate; 7. Main exhaust channel; 8. Auxiliary exhaust channel; 9. Circuit breaker body; 91. Wiring port; 92. Air duct structure; 93. Upper exhaust port; 94. Arc-extinguishing isolation plate. Detailed Implementation

[0030] 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.

[0031] 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.

[0032] 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.

[0033] Example 1

[0034] This embodiment provides, as follows: Figure 1-4 The integrated arc extinguishing device shown is installed and integrated within the circuit breaker, and includes:

[0035] The arc-extinguishing chamber unit 1 is equipped with an arc-extinguishing plate group 5 for interrupting the electric arc, and the front end of the arc-extinguishing plate group 5 is provided with an arc-initiating port structure.

[0036] The arc-extinguishing chamber unit 2 has an arc-extinguishing plate group 6 located at the rear end of the arc-extinguishing plate group 5. The arc-extinguishing chamber unit 2 is integrally connected to the arc-extinguishing chamber unit 1 through a set of mounting side plates 3.

[0037] A set of extension baffles 4 is formed by extending the set of mounting side plates 3 towards the circuit breaker terminal, and its ends cover the inner walls of both sides of the circuit breaker terminal 91. The mounting side plates 3 and the extension baffles 4 are integrally formed to constitute the side walls of the arc-extinguishing chamber unit 1 and the arc-extinguishing chamber unit 2, respectively, so that the arc-extinguishing chamber unit 1 and the arc-extinguishing chamber unit 2 form a continuous and interconnected arc-extinguishing cavity 11 and arc-extinguishing cavity 21. The arc-extinguishing plate group 5 is arranged vertically in the arc-extinguishing cavity 11, and the arc-extinguishing plate group 6 is arranged horizontally in the arc-extinguishing cavity 21. In this text, the vertical direction corresponds to the height direction of the circuit breaker, and the horizontal direction corresponds to the length direction of the circuit breaker.

[0038] In a further preferred embodiment, the arc-extinguishing chamber unit 1 and the arc-extinguishing chamber unit 2 are housed within the gas duct structure 92 of the circuit breaker, as shown in the reference. Figure 3-4The gas duct structure 92 extends from the contact shaft of the circuit breaker to the wiring port 91. The height of the arc extinguishing chamber 11 is greater than that of the arc extinguishing chamber 21, forming a stepped expansion structure. According to the arc extinguishing plate group 5, which is set in the arc extinguishing chamber 11, by reasonably optimizing the layout of the shell structure and the arc extinguishing chamber, the height space of the arc extinguishing chamber 11 can be increased to meet the needs of setting more arc extinguishing plates. The arc extinguishing plate group 5 is a multi-layer stacked structure, which includes multiple arc extinguishing grids arranged vertically between a group of mounting side plates 3. This makes full use of the vertical height of the arc extinguishing chamber. Without the need for additional space expansion, the arc extinguishing capability can be enhanced by increasing the number of grids, thereby effectively increasing the overall capacity of the arc extinguishing chamber. This makes the voltage borne by each arc extinguishing grid smaller, reduces the arc burning time, and achieves efficient arc extinguishing in a compact space, which is in line with the trend of miniaturization and integration of circuit breakers. With this structural design, the electric arc generated by the contact breaking will flow naturally along the air passage to the arc extinguishing chamber and the arc suppression chamber. The electric arc will be cut by multiple layers of dense arc extinguishing grids. Each grid can break the electric arc, consume energy, accelerate the cooling and extinguishing of the electric arc, and improve the arc extinguishing efficiency. After the arc is extinguished, the electric arc enters the arc suppression chamber, where the residual electric arc and metal particles are further adsorbed and cooled by the arc suppression plate group 6, thereby achieving a step-by-step decay of the electric arc energy and effectively reducing the risk of electric arc reignition.

[0039] like Figure 1-2 As shown, the arc-suppressing plate group 6 includes a plurality of arc-suppressing grid plates 61 arranged at intervals in a horizontal direction between a group of extended baffles 4. Each arc-suppressing grid plate 61 has through holes evenly distributed in a matrix. A plurality of arc-suppressing gaps are formed between the plurality of arc-suppressing grid plates 61 and are distributed at intervals in the wiring port 91. The spacing of the plurality of arc-suppressing gaps gradually decreases from the inside to the outside along the arrangement direction of the arc-suppressing grid plates 61. The advantages of this design layout are that the matrix of through holes on the arc-extinguishing grids 61 allows cooling airflow and residual electric arc to pass through. When the airflow passes through, it accelerates heat exchange, further cooling the electric arc. The "maze effect" formed by the through holes allows fine electric arcs and metal particles to collide and consume energy as they pass through, and they may even be adsorbed by the hole walls, reducing the risk of escape. Furthermore, the arc-extinguishing gaps between the arc-extinguishing grids 61 are designed with a gradual gap. As the electric arc moves from the arc-extinguishing chamber to the connection port 91, a gradient filtration is achieved, from sparse to dense, allowing residual electric arcs and metal particles to be gradually captured by the arc-extinguishing grids 61. This structural design of the arc-extinguishing grids and gaps follows the law of decreasing electric arc energy and shrinking particle size, allowing the arc-extinguishing structure to dynamically match the characteristics of the electric arc, improving the accuracy and thoroughness of arc extinguishing.

[0040] In this embodiment, combined with Figure 2-4As shown, the circuit breaker includes a base and a middle cover, and an air duct structure 92 and a wiring port 91 formed between the base and the middle cover. The arc-extinguishing chamber unit 1 is disposed in the air duct structure 92, and the arc-extinguishing chamber unit 2 is disposed in the wiring port 91. Since this circuit breaker product has a reclosing function, a groove structure is provided on the top of the middle cover to meet the installation requirements of the reclosing mechanism, and a boss structure is formed on one side of the groove structure. The boss structure makes full use of the excess space on the top of the middle cover to extend and expand to form the air duct structure 92, thereby increasing the longitudinal volume of the arc-extinguishing chamber. As a preferred embodiment, the air duct structure 92 includes a lower part that is horizontally connected to the wiring port 91. The system includes an air passage, an upper air passage vertically connected above the lower air passage, and an upper exhaust port 93 disposed in the middle cover and communicating with the upper air passage. The arc-extinguishing plate group 5 includes an upper arc-extinguishing layer 52 and a lower arc-extinguishing layer 51, which are composed of multiple arc-extinguishing grids and respectively housed in the lower air passage and the lower air passage. The lower arc-extinguishing layer 51 is disposed opposite to the arc-extinguishing plate group 6 and opposite to the upper exhaust port 93. Multiple arc-extinguishing isolation plates 94 are disposed in the upper exhaust port 93. The main exhaust flow channel 7 is formed by the arc-extinguishing cavity 11 and the arc-extinguishing cavity 21 communicating with the wiring port 91. The secondary exhaust flow channel 8 is formed by the arc-extinguishing cavity 11 and the air passage structure 92 communicating with the upper exhaust port 93. The advantage of this design is that after the arc is broken at the contact, it is initially cut by the arc-extinguishing plate group 5 and then purified by the arc-extinguishing plate group 6 before being discharged from the terminal. This main exhaust channel 7, composed of the arc-extinguishing chamber, the arc-extinguishing chamber, and the terminal, can guarantee the basic arc-extinguishing requirements. However, when the arc energy is too large and the main channel cannot fully accommodate it, some of the arc will surge upward into the upper air channel, be cut a second time by the upper arc-extinguishing layer 52, and finally be discharged from the upper exhaust port 93 with the arc-extinguishing isolation plate 94. The multi-layer arc-extinguishing grid cuts and cools the arc in the first instance, reducing its spread to the main and secondary channels. The energy of the arc extinguishing plate is the first line of defense for arc extinguishing. According to the arc extinguishing plate group 5, it is divided into upper and lower arc extinguishing layers 5. The upper arc extinguishing layer 52, together with the arc extinguishing isolation plate 94 of the upper exhaust port 93, plays a secondary role in arc extinguishing and isolation protection. This dual-channel current shunting design avoids arc rebound and insulation damage caused by single channel congestion, and improves the adaptability of the circuit breaker to complex working conditions. This technical solution adopts a combination structure design of dual airflow channels, layered arc extinguishing, and secondary arc extinguishing, so that the circuit breaker can not only cope with conventional small current breaking, but also withstand short-circuit large current breaking, which greatly improves the breaking capacity of the circuit breaker.

[0041] Example 2

[0042] This embodiment provides, as follows: Figure 3-4The molded case circuit breaker shown includes a wiring port 91 and a gas passage structure 92 disposed in the circuit breaker housing, and an integrated arc extinguishing device as described in Embodiment 1 above. The arc extinguishing plate group 5 is disposed in the gas passage structure 92 and located behind the contact breaking point, and the arc extinguishing plate group 6 is disposed in the wiring port 91 and located behind the arc extinguishing plate group 5. The circuit breaker in this embodiment is equipped with the moving contact device as described above, and therefore naturally possesses all the advantages brought about by the installation of the moving contact device. The arc-extinguishing chamber and the arc-suppression chamber are connected by the mounting side plate and the extension baffle to form a whole, so that the arc-extinguishing plate group 5 is fixed by the mounting side plate 3 and the arc-suppression plate group 6 is fixed by the extension baffle 4, forming a rigid frame as a whole. It is not easy to deform or loosen under conditions such as arc impact and airflow disturbance, ensuring the stability of arc extinguishing / arc suppression function during long-term operation. It has good structural stability and is conducive to integrated installation. The arc-extinguishing plate group 5 is divided into a lower arc-extinguishing layer 51 and an upper arc-extinguishing layer 52. The lower arc-extinguishing layer 51 is close to the contact and prioritizes cutting the high-energy initial arc. The upper arc-extinguishing layer handles the upward-spreading residual arc. Finally, the low-energy residual arc is intercepted by the arc-suppression plate group 6, forming a stepped processing flow. This avoids the arc-extinguishing failure of a single structure due to excessive load. The high-temperature gas is quickly discharged by the dual airflow channels, reducing the heat accumulation in the cavity and avoiding arc and gas congestion, thereby improving the arc-extinguishing capacity and breaking capacity of the circuit breaker and achieving a zero-flying arc effect.

[0043] 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 integrated arc quenching and arc extinguishing device installed integrated in a circuit breaker, characterized in that, include: The arc-extinguishing chamber unit (1) is equipped with an arc-extinguishing plate group (5) for interrupting the electric arc. The front end of the arc-extinguishing plate group (5) is provided with an arc-starting port structure. The arc-extinguishing chamber unit (2) is equipped with an arc-extinguishing plate group (6) located at the rear end of the arc-extinguishing plate group (5). The arc-extinguishing chamber unit (2) is integrally connected to the arc-extinguishing chamber unit (1) through a set of mounting side plates (3). A set of extension baffles (4) are formed by a set of mounting side plates (3) extending toward the circuit breaker connection port (91), and their ends cover the inner walls on both sides of the connection port (91); The mounting side plate (3) and the extension baffle (4) are integrally formed to form the side wall of the arc extinguishing chamber unit (1) and the side wall of the arc extinguishing chamber unit (2), respectively, so that the arc extinguishing chamber unit (1) and the arc extinguishing chamber unit (2) form a continuous and interconnected arc extinguishing cavity (11) and arc extinguishing cavity (21). The arc extinguishing plate group (5) is arranged vertically in the arc extinguishing cavity (11), and the arc extinguishing plate group (6) is arranged horizontally in the arc extinguishing cavity (21).

2. The integrated arc extinguishing and arc-suppressing device according to claim 1, characterized in that: The arc extinguishing plate group (5) and the arc extinguishing plate group (6) are housed in the gas passage structure (92) of the circuit breaker. The gas passage structure (92) extends from the contact shaft position of the circuit breaker to the wiring port (91). The height of the arc extinguishing cavity (11) is greater than the height of the arc extinguishing cavity (21), forming a stepped expansion structure.

3. The integrated arc extinguishing and arc-suppressing device according to claim 2, characterized in that: The arc-extinguishing plate group (5) is a multi-layer stacked structure, which includes multiple arc-extinguishing grid plates arranged at intervals in the vertical direction between a set of mounting side plates (3).

4. The integrated arc extinguishing and arc-suppressing device according to claim 2, characterized in that: The arc-extinguishing plate group (6) includes a plurality of arc-extinguishing grid plates (61) arranged at intervals in the horizontal direction between a group of extended baffles (4), and each arc-extinguishing grid plate (61) has through holes evenly distributed in a matrix.

5. The integrated arc extinguishing and arc-suppressing device according to claim 4, characterized in that: Multiple arc-extinguishing grids (61) are spaced apart in the wiring port (91), and the spacing between the multiple arc-extinguishing gaps gradually decreases from the inside to the outside along the arrangement direction of the arc-extinguishing grids (61).

6. The integrated arc extinguishing and arc suppressing device according to any one of claims 1-5, characterized in that: The circuit breaker includes a base and a middle cover, and an air passage structure (92) and a wiring port (91) formed between the base and the middle cover. The arc-extinguishing chamber unit (1) is disposed in the air passage structure (92), and the arc-extinguishing chamber unit (2) is disposed in the wiring port (91).

7. The integrated arc extinguishing and arc-suppressing device according to claim 6, characterized in that: The air passage structure (92) includes a lower air passage that is horizontally connected to the wiring port (91), an upper air passage that is vertically connected above the lower air passage, and an upper exhaust port (93) that is disposed in the middle cover and communicates with the upper air passage. The arc extinguishing plate group (5) includes an upper arc extinguishing layer (52) and a lower arc extinguishing layer (51) that are composed of multiple arc extinguishing grids and respectively housed in the lower air passage and the lower air passage. The lower arc extinguishing layer (51) is disposed opposite to the arc extinguishing plate group (6) and the lower arc extinguishing layer (51) is disposed opposite to the upper exhaust port (93). Multiple arc extinguishing isolation plates (94) are disposed in the upper exhaust port (93).

8. The integrated arc extinguishing and arc-suppressing device according to claim 7, characterized in that: The arc-extinguishing chamber (11) and the arc-extinguishing chamber (21) are connected to the wiring port (91) to form the main exhaust channel (7); the arc-extinguishing chamber (11) and the air passage structure (92) are connected to the upper exhaust port (93) to form the secondary exhaust channel (8).

9. A circuit breaker, comprising a wiring port (91) and a gas duct structure (92) disposed on a circuit breaker body (9), characterized in that: The integrated arc extinguishing and arc-suppressing device according to any one of claims 1-8 is adopted.

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