Built-in arc extinguishing structure of circuit breaker

Abstract

The built-in arc extinction structure comprises an arc extinguish chamber cavity and a wiring cavity opening which are arranged in a circuit breaker shell, the wiring cavity opening comprises an upper exhaust area and a lower wiring area, an arc isolation blocking piece is arranged between the lower wiring area and an arc extinguish chamber body, an arc extinction net structure which is connected with the arc isolation blocking piece in a matched mode is arranged in the upper exhaust area, and the arc extinction net structure is arranged in the lower wiring area. The circuit breaker comprises an arc extinguishing chamber body, an arc isolating baffle plate and an arc extinguishing net structure, the arc isolating baffle plate is arranged opposite to the lower half part of the rear end of the arc extinguishing chamber body, the arc extinguishing net structure is arranged opposite to the upper half part of the rear end of the arc extinguishing chamber body, and the arc extinguishing net structure comprises a first arc extinguishing net piece and a second arc extinguishing net piece which are arranged in an upper exhaust area in parallel at an interval. The circuit breaker is simple in structure and convenient to install, so that the manufacturing cost is reduced, the arc extinguishing net structure plays a role in deionization of arc free gas, metal particles can be prevented from being sprayed outwards, the purpose of eliminating flashover is achieved, the breaking performance of the circuit breaker is improved, and the service life of the circuit breaker is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, in particular to a built-in arc extinguishing structure of a circuit breaker. Background Art

[0002] During the breaking process of the molded case circuit breaker with load or fault current, the voltage between the moving and static contacts will cause the air medium to discharge and form an arc. The arc is introduced into the arc extinguishing chamber in the circuit breaker through the arc-starting plate and magnetic blowing effect to extinguish the arc. The arc extinguishing plate in the arc extinguishing chamber is used to cut the arc and absorb energy, and finally extinguish the arc. Due to the large breaking current, a small amount of charged ionized gas or residual arc will be ejected from the back of the arc extinguishing chamber to the outside of the circuit breaker housing, and it will also carry hot metal particles. These metal particles will directly burst out with the free gas, which will break through the circuit breaker terminal baffle and fly out of the circuit breaker, causing the surrounding lines to short-circuit or burn. The common safety practice on the market is to install an arc extinguishing terminal cover at the circuit breaker terminal to eliminate and block the free metal particles, but the structure of this terminal cover is complex and the installation occupies a large space, which will increase the installation volume of the entire circuit breaker product, especially in the cabinet, which will be limited by the installation size, and there are limitations, increasing the manufacturing cost. Utility Model Content

[0003] Therefore, the technical problem to be solved by the utility model is to overcome the problem in the prior art that a terminal cover is installed at the wiring terminal of the circuit breaker for eliminating free-flowing, but the terminal cover has a complex structure and occupies a large installation space, which will increase the installation volume of the circuit breaker product and increase the manufacturing cost.

[0004] In order to solve the above technical problems, the utility model provides a built-in arc extinguishing structure of a circuit breaker, comprising a circuit breaker housing and an arc extinguishing chamber cavity and a wiring cavity opening adjacently arranged in the circuit breaker housing in front and behind, and an arc extinguishing chamber body installed in the arc extinguishing chamber cavity, the wiring cavity opening comprises a lower wiring area of ​​an upper exhaust area arranged up and down, an arc isolation baffle is provided between the lower wiring area and the arc extinguishing chamber body, an arc extinguishing net structure is provided in the upper exhaust area and cooperates with the arc isolation baffle to separate the wiring cavity opening from the arc extinguishing chamber body, the arc isolation baffle is arranged opposite to the lower half of the rear end of the arc extinguishing chamber body, the arc extinguishing net structure is arranged opposite to the upper half of the rear end of the arc extinguishing chamber body, and the arc extinguishing net structure is composed of at least one metal arc extinguishing mesh sheet provided with a plurality of air holes.

[0005] In the above-mentioned built-in arc-extinguishing structure of the circuit breaker, the arc-extinguishing mesh structure includes a first arc-extinguishing mesh and a second arc-extinguishing mesh arranged in parallel and spaced apart in the upper exhaust area, and the aperture diameter of the air holes arranged on the first arc-extinguishing mesh is larger than the aperture diameter of the air holes arranged on the second arc-extinguishing mesh.

[0006] In the above-mentioned built-in arc-extinguishing structure of the circuit breaker, the arc-extinguishing mesh structure includes an arc-extinguishing bottom plate connected to the bottom of the first arc-extinguishing mesh plate and the second arc-extinguishing mesh plate, and the arc-extinguishing bottom plate is horizontally located above the lower wiring area.

[0007] In the above-mentioned built-in arc-extinguishing structure of the circuit breaker, the first arc-extinguishing mesh, the second arc-extinguishing mesh and the arc-extinguishing bottom plate are integrally connected to form a U-shaped structure.

[0008] In the above-mentioned built-in arc extinguishing structure of the circuit breaker, the first arc extinguishing mesh and the arc isolation baffle are connected in the vertical direction and are arranged opposite to the rear end of the arc extinguishing chamber body.

[0009] In the above-mentioned built-in arc extinguishing structure of the circuit breaker, the arc extinguishing chamber body includes two opposite side mounting plates, and a plurality of arc extinguishing plates arranged in an inclined manner between the two side mounting plates, and a gap is formed between the first arc extinguishing mesh and the arc isolation baffle plate and the plurality of arc extinguishing plates, the spacing of which gradually increases from bottom to top.

[0010] In the above-mentioned built-in arc extinguishing structure of the circuit breaker, the arc extinguishing net structure and the arc isolation baffle are detachably arranged in the upper exhaust area and the lower connection area respectively through the installation structure, and the two form a limit fit that abuts against each other up and down after installation.

[0011] In the above-mentioned built-in arc-extinguishing structure of the circuit breaker, it is formed on the middle cover and the base, and the installation structure includes at least a pair of first slots relatively arranged on the side walls of the upper exhaust area, and the two side edges of the first arc-extinguishing mesh or the second arc-extinguishing mesh are inserted into a pair of the first slots.

[0012] In the above-mentioned built-in arc extinguishing structure of the circuit breaker, the mounting structure comprises a pair of second slots arranged oppositely on the side walls of the lower wiring area, and the side edges of the arc-isolating baffle are inserted into the pair of second slots.

[0013] In the above-mentioned built-in arc-extinguishing structure of the circuit breaker, at least one mounting protrusion which cooperates with and squeezes and clamps with the inner wall of the first slot is provided on the first arc-extinguishing mesh or the second arc-extinguishing mesh.

[0014] Compared with the prior art, the technical solution of the utility model has the following advantages:

[0015] 1. In the built-in arc extinguishing structure of the circuit breaker provided by the utility model, the upper exhaust area and the lower wiring area are arranged up and down according to the wiring cavity opening. The lower wiring area and the arc extinguishing chamber body are separated from each other by an arc-isolating baffle. By arranging an arc-extinguishing net structure opposite to the rear end of the arc extinguishing chamber body in the upper exhaust area, the advantage of this design is that the arc-free gas generated by the arc extinguishing chamber body extinguishing the arc will flow and spray to one side of the wiring cavity opening, and the arc-isolating baffle will block part of the arc-free gas, effectively preventing the arc-free gas from causing ablation damage to the wiring terminals located in the lower wiring area, and guiding and accelerating the free gas from the upper exhaust area under the action of the gas pressure difference. The arc extinguishing net structure is used to discharge the arc free gas, so that the arc extinguishing net structure is discharged to one end of the circuit breaker after the arc extinguishing. The circuit breaker adopting this technical solution has the arc extinguishing net structure built into the wiring cavity, which reasonably optimizes the structural layout, has a simple structure, and is easy to install. It avoids the use of traditional terminal cover methods to increase the product volume, thereby reducing manufacturing costs. The arc extinguishing net structure has an extinguishing effect on the arc free gas, which is beneficial to the cooling of the free gas and metal particles, and can block the filtering metal particles from spraying outward, so as to achieve the purpose of eliminating arcing. This improves the breaking performance and service life of the circuit breaker, and ensures the safety of the equipment and the stability of the electrical performance.

[0016] 2. In the built-in arc-extinguishing structure of the circuit breaker provided by the utility model, the arc-extinguishing mesh structure includes a first arc-extinguishing mesh and a second arc-extinguishing mesh which are spaced apart in the upper exhaust area. The aperture of the air holes arranged on the first arc-extinguishing mesh is larger than the aperture of the air holes arranged on the second arc-extinguishing mesh. The advantage of such a design is that the first arc-extinguishing mesh with a larger aperture can be used to block large metal particles first, and allow free gas to pass through the first arc-extinguishing mesh from the arc-extinguishing chamber cavity into the exhaust area, and the first arc-extinguishing mesh with a larger aperture can be used to block small metal particles in the free gas, so that the free gas can be eliminated and filtered twice, and the residual arc can be extinguished. The double-layer metal mesh makes it easier to adsorb free metal particles, which can gradually extinguish the arc free gas and avoid arcing.

[0017] 3. In the built-in arc extinguishing structure of the circuit breaker provided by the utility model, the arc extinguishing mesh structure includes an arc extinguishing bottom plate connected to the bottom of the first arc extinguishing mesh and the second arc extinguishing mesh, so that the first arc extinguishing mesh, the second arc extinguishing mesh and the arc extinguishing bottom plate are connected as a whole to form a U-shaped structure. With this structural arrangement, when the movement of free gas in the upper exhaust area is blocked, it will move toward the lower wiring area, so that this part of the arc free gas can flow to the wiring area below after secondary deionization by the arc extinguishing bottom plate, and at the same time, the filtered metal particles can be eliminated, thereby avoiding ablation damage to the wiring terminals located in the wiring area, with good protection effect and better achieving the requirement of zero arcing.

[0018] 4. In the built-in arc extinguishing structure of the circuit breaker provided by the utility model, the arc extinguishing net structure of this U-shaped structure design is small in size and simple in structure, which reduces manufacturing costs. By optimizing the internal space layout of the circuit breaker, the arc extinguishing net structure can be well installed in the wiring cavity to achieve the effect of extinguishing the arc free gas, making the discharged arc gas cleaner and safer, avoiding arcing, and improving the breaking capacity of the circuit breaker product.

[0019] 5. In the built-in arc extinguishing structure of the circuit breaker provided by the utility model, a gap is formed between the first arc extinguishing mesh and the arc isolation baffle and the multiple arc extinguishing pieces, and the spacing of the gap gradually increases from bottom to top. This design forms a pressure difference effect on the upper and lower sides of the gap, and the multiple arc extinguishing pieces arranged obliquely in the arc extinguishing chamber body allow the free gas discharged from the arc extinguishing chamber body to flow into the upper exhaust area after passing through the gap, thereby avoiding gas blockage, and facilitating the free gas to flow and be discharged between the multiple arc extinguishing pieces and the arc extinguishing mesh structure, and finally be discharged from the circuit breaker after being freed by the multiple layers of arc extinguishing meshes, thereby improving the arc extinguishing ability of the circuit breaker, and further improving the breaking performance and service life of the circuit breaker.

[0020] 6. In the built-in arc extinguishing structure of the circuit breaker provided by the utility model, the upper exhaust area and the lower wiring area are respectively formed on the middle cover and the base, and a pair of first slots are provided on the side walls on both sides of the upper exhaust area, and the side edges of the first arc extinguishing mesh or the second arc extinguishing mesh are inserted into the first slots to realize the installation of the arc extinguishing mesh structure in the upper exhaust area, and the arc isolation baffle is installed in the second slot of the lower wiring area in the same way, and then the base and the middle cover are assembled together to form a wiring cavity opening, at this time, the bottom of the arc extinguishing mesh structure is just in contact with the top of the arc isolation baffle, so that the two form an installation limit fit in the wiring cavity opening to prevent loosening, thereby ensuring the installation stability and reliability of the arc extinguishing mesh structure and the arc isolation baffle. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the drawings required for use in the specific implementation or the description of the prior art will be briefly introduced below.

[0022] Figure 1 This is a front view of the built-in arc extinguishing structure of the circuit breaker provided by the utility model;

[0023] Figure 2 It is a schematic cross-sectional structure diagram of the built-in arc extinguishing structure of the circuit breaker of the utility model;

[0024] Figure 3 This is a schematic diagram of the installation structure of the arc isolation baffle on the base of the utility model;

[0025] Figure 4This is a schematic diagram of the installation structure of the arc extinguishing net structure of the utility model on the base;

[0026] Figure 5 It is a structural schematic diagram of the arc extinguishing net structure of the utility model;

[0027] Explanation of the reference numerals: 1. Circuit breaker housing; 11. Base; 12. Middle cover; 13. First slot; 14. Second slot; 2. Arc extinguishing chamber; 3. Wiring chamber opening; 31. Lower wiring area; 32. Upper exhaust area; 4. Arc-isolating baffle; 5. Arc-extinguishing mesh structure; 51. First arc-extinguishing mesh; 52. Second arc-extinguishing mesh; 53. Arc-extinguishing bottom plate; 6. Arc-extinguishing chamber body; 61. Arc-extinguishing plate; 7. Gap. DETAILED DESCRIPTION

[0028] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] In the description of the present invention, it should be noted that the terms "first", "second" and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Example

[0032] The present embodiment is described in detail below with reference to the accompanying drawings:

[0033] This embodiment provides Figure 1-5A built-in arc extinguishing structure of a circuit breaker is shown, comprising a circuit breaker housing 1 and an arc extinguishing chamber cavity 2 and a wiring cavity opening 3 adjacently arranged in the circuit breaker housing 1 in the front and rear, and an arc extinguishing chamber body 6 installed in the arc extinguishing chamber cavity 2, the wiring cavity opening 3 comprising a lower wiring area 31 of an upper exhaust area 32 arranged up and down, an arc isolation baffle 4 is provided between the lower wiring area 31 and the arc extinguishing chamber body 6, an arc extinguishing net structure 5 is provided in the upper exhaust area 32, and the arc isolation baffle 4 is connected to separate the wiring cavity opening 3 from the arc extinguishing chamber body 6, the arc isolation baffle 4 is arranged opposite to the lower half of the rear end of the arc extinguishing chamber body 6, the arc extinguishing net structure 5 is arranged opposite to the upper half of the rear end of the arc extinguishing chamber body 6, and the arc extinguishing net structure 5 is composed of at least one metal arc extinguishing mesh with a plurality of air holes.

[0034] In the above-mentioned embodiment, the wiring cavity opening 3 is divided into an upper exhaust area 32 and a lower wiring area 31 arranged up and down, and the lower wiring area 31 is separated from the arc extinguishing chamber body 6 by the arc isolation baffle 4. By providing an arc extinguishing net structure 5 opposite to the rear end of the arc extinguishing chamber body in the upper exhaust area 32, the advantage of such a design is that the arc free gas generated by the arc extinguishing chamber body 6 extinguishing the arc will flow and spray toward one side of the wiring cavity opening, and the arc isolation baffle 4 will block part of the arc free gas, effectively preventing the arc free gas from causing ablation damage to the wiring terminal located in the lower wiring area 31, and guiding and accelerating the free gas from the upper exhaust area 3 under the action of the gas pressure difference. 2 flow discharge, so that the arc free gas is discharged to one end of the circuit breaker after the arc is extinguished by the arc extinguishing net structure 5. The circuit breaker adopting this technical solution has the arc extinguishing net structure 5 built into the wiring cavity, reasonably optimizes the structural layout, has a simple structure, is easy to install, avoids the use of traditional terminal cover method to increase the product volume, thereby reducing the manufacturing cost, and has an arc extinguishing effect on the arc free gas through the arc extinguishing net structure, which is beneficial to the cooling of the free gas and metal particles, and can block and filter the metal particles from spraying outward, so as to achieve the purpose of eliminating arcing, thereby improving the breaking performance and service life of the circuit breaker, ensuring the safety of the equipment and the stability of the electrical performance.

[0035] Combine the following Figure 2-5 The specific setting method of the arc extinguishing network structure is described in detail:

[0036] The arc extinguishing mesh structure 5 includes a first arc extinguishing mesh 51 and a second arc extinguishing mesh 52 which are arranged in parallel and at intervals in the upper exhaust area 32. The aperture of the air holes arranged on the first arc extinguishing mesh 51 is larger than the aperture of the air holes arranged on the second arc extinguishing mesh 52. The advantage of such a design is that the first arc extinguishing mesh 51 with a larger aperture can be used to first block large metal particles, and allow free gas to pass through the first arc extinguishing mesh 51 from the arc extinguishing chamber cavity into the exhaust area, and the first arc extinguishing mesh 51 with a larger aperture can be used to block small metal particles in the free gas, so that the free gas can be eliminated and filtered twice, and the residual arc can be extinguished. The double-layer metal mesh makes it easier to adsorb free metal particles, which can gradually extinguish the arc free gas and avoid arcing.

[0037] It is further preferred that the arc extinguishing mesh structure 5 includes an arc extinguishing bottom plate 53 connected to the bottom of the first arc extinguishing mesh 51 and the second arc extinguishing mesh 52, and the arc extinguishing bottom plate 53 is horizontally located above the lower wiring area 31, wherein the first arc extinguishing mesh 51, the second arc extinguishing mesh 52 and the arc extinguishing bottom plate 53 are integrally connected to form a U-shaped structure. The arc extinguishing mesh structure 5 with such a U-shaped structure design has a small volume and a simple structure, which reduces the manufacturing cost. By optimizing the internal space layout of the circuit breaker, the arc extinguishing mesh structure 5 can be well installed in the wiring cavity 3. With such a structural arrangement, when the movement of arc free gas in the upper exhaust area 32 is obstructed, it will move toward the side of the lower wiring area 31, so that this part of the arc free gas can flow to the lower wiring area below after the secondary deionization of the arc extinguishing bottom plate, and at the same time, it can eliminate and filter out metal particles, which is beneficial to accelerate the cooling of the arc gas, thereby avoiding ablation damage to the wiring terminals located in the wiring area, with good protection effect, and better achieving the requirement of zero arcing.

[0038] In this embodiment, the first arc-extinguishing mesh 51 and the arc-isolating baffle 4 are connected in the vertical direction and are arranged opposite to the rear end of the arc-extinguishing chamber body 6. Figure 2-3 The arc extinguishing chamber body 6 includes two opposite side mounting plates, and a plurality of arc extinguishing sheets 61 arranged in an inclined shape between the two side mounting plates. A gap 7 with a spacing gradually increasing from bottom to top is formed between the first arc extinguishing mesh sheet 51 and the arc isolation baffle sheet 4 and the plurality of arc extinguishing sheets 61. This design forms a pressure difference effect on the upper and lower sides of the gap. In addition, the plurality of arc extinguishing sheets 61 are arranged in an inclined manner and face the arc extinguishing mesh structure 5, which is conducive to the free gas discharged from the arc extinguishing chamber body to flow into the upper exhaust area after passing through the gap, avoiding gas blockage, and facilitating the free gas to flow and discharge between the plurality of arc extinguishing sheets and the arc extinguishing mesh structure, and finally discharged from the circuit breaker after being freed by the multi-layer arc extinguishing mesh, thereby improving the arc extinguishing ability of the circuit breaker, and further improving the breaking performance and service life of the circuit breaker.

[0039] Combination Figure 2-4 As shown, the arc-extinguishing net structure 5 and the arc-isolating baffle 4 are detachably arranged in the upper exhaust area 32 and the lower wiring area 31 through the installation structure, and the two form a limit fit that abuts against each other up and down after installation. As a preferred embodiment, the circuit breaker housing 1 includes a base 11 and a middle cover 12 that are installed in a matching manner. The upper exhaust area 32 and the lower wiring area 31 are respectively formed on the middle cover 12 and the base 11. The installation structure includes a pair of first slots 13 relatively arranged on the side walls of the upper exhaust area 32. The side edges of the first arc-extinguishing net 51 are inserted into the pair of first slots 13. Alternatively, the side edges of the second arc-extinguishing net 52 can be inserted into the pair of first slots 13, and both sides of the arc-extinguishing net structure 5 in the upper wiring area can be realized. Installation; correspondingly, the installation structure also includes a pair of second slots 14 relatively arranged on the side walls of the lower wiring area 31, and the side edges of the arc isolation baffle 4 are inserted into the pair of second slots. It can be seen from the above structure that the side edges of the first arc extinguishing mesh 51 are inserted into the first slots 13 to realize the installation of the arc extinguishing mesh structure 5 in the upper exhaust area 32, and the arc isolation baffle 4 is installed in the second slots 14 of the lower wiring area 31 in the same way, and then the base 11 and the middle cover 12 are assembled together to form a wiring cavity opening. At this time, the bottom of the arc extinguishing mesh structure is just in contact with the top of the arc isolation baffle, so that the two form an installation limit fit in the wiring cavity opening to prevent loosening, thereby ensuring the installation stability and reliability of the arc extinguishing mesh structure and the arc isolation baffle.

[0040] As a preferred embodiment, in order to ensure the stability of the arc-extinguishing mesh structure 5 installed on the upper cover, the first arc-extinguishing mesh 51 or the second arc-extinguishing mesh 52 is provided with a mounting protrusion that cooperates with the inner wall of the first slot 13 for squeezing and clamping, and the mounting protrusion is integrally stamped and formed on any side surface of the first arc-extinguishing mesh 51 or the second arc-extinguishing mesh 52. With this structural arrangement, when the first arc-extinguishing mesh 51 or the second arc-extinguishing mesh 52 is inserted into the first slot 13, the mounting protrusion is squeezed and contacted with the inner wall of the first slot to achieve a clamping installation effect, which can also play a limiting and anti-loosening installation effect to prevent the arc-extinguishing mesh from falling out of the slot. The installation is convenient and quick, and the fit and fixation are reliable.

[0041] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A circuit breaker built-in arc extinguishing structure, comprising a circuit breaker housing (1), an arc extinguishing chamber cavity (2) and a wiring cavity opening (3) arranged adjacent to each other in the circuit breaker housing (1), and an arc extinguishing chamber body (6) installed in the arc extinguishing chamber cavity (2), characterized in that: The connection cavity opening (3) comprises an upper exhaust area (32) and a lower connection area (31) arranged in an upper and lower manner; an arc-isolating baffle (4) is provided between the lower connection area (31) and the arc-extinguishing chamber body (6); an arc-extinguishing net structure (5) is provided in the upper exhaust area (32) and is connected to the arc-isolating baffle (4) to separate the connection cavity opening (3) from the arc-extinguishing chamber body (6); the arc-isolating baffle (4) is arranged opposite to the lower half of the rear end of the arc-extinguishing chamber body (6); the arc-extinguishing net structure (5) is arranged opposite to the upper half of the rear end of the arc-extinguishing chamber body (6); and the arc-extinguishing net structure (5) is composed of at least one metal arc-extinguishing net sheet provided with a plurality of air holes.

2. The circuit breaker built-in arc extinguishing structure according to claim 1, characterized in that: The arc-extinguishing mesh structure (5) comprises a first arc-extinguishing mesh sheet (51) and a second arc-extinguishing mesh sheet (52) which are arranged in parallel and at intervals in the upper exhaust area (32), and the aperture of the air holes arranged on the first arc-extinguishing mesh sheet (51) is larger than the aperture of the air holes arranged on the second arc-extinguishing mesh sheet (52).

3. The built-in arc extinguishing structure of a circuit breaker according to claim 2, characterized in that: The arc extinguishing mesh structure (5) comprises an arc extinguishing bottom plate (53) connected to the bottoms of the first arc extinguishing mesh plate (51) and the second arc extinguishing mesh plate (52), and the arc extinguishing bottom plate (53) is horizontally located above the lower wiring area (31).

4. A circuit breaker built-in arc extinguishing structure according to claim 3, characterized in that: The first arc-extinguishing mesh sheet (51), the second arc-extinguishing mesh sheet (52) and the arc-extinguishing bottom sheet (53) are integrally connected to form a U-shaped structure.

5. A circuit breaker built-in arc extinguishing structure according to any one of claims 2 to 4, characterized in that: The first arc-extinguishing mesh sheet (51) and the arc-isolating baffle sheet (4) are connected in a vertical direction and are arranged opposite to the rear end of the arc-extinguishing chamber body (6).

6. The circuit breaker built-in arc extinguishing structure according to claim 5, characterized in that: The arc extinguishing chamber body (6) comprises two opposite side mounting plates, and a plurality of arc extinguishing plates (61) arranged in an inclined manner between the two side mounting plates, and a gap (7) with a spacing gradually increasing from bottom to top is formed between the first arc extinguishing mesh plate (51) and the arc isolation baffle plate (4) and the plurality of arc extinguishing plates (61).

7. The circuit breaker built-in arc extinguishing structure according to claim 1, characterized in that: The arc extinguishing net structure (5) and the arc isolation baffle (4) are detachably arranged in the upper exhaust area (32) and the lower connection area (31) respectively through the installation structure, and the two form a limit fit that abuts against each other up and down after installation.

8. The circuit breaker built-in arc extinguishing structure according to claim 7, characterized in that: The circuit breaker housing (1) comprises a base (11) and a middle cover (12) which are mounted together, the upper exhaust area (32) and the lower connection area (31) are respectively formed on the middle cover (12) and the base (11), the mounting structure comprises at least a pair of first slots (13) arranged relatively on the side walls of both sides of the upper exhaust area (32), and the side edges of the first arc-extinguishing mesh (51) or the second arc-extinguishing mesh (52) are inserted into the pair of first slots (13).

9. The circuit breaker built-in arc extinguishing structure according to claim 7, characterized in that: The mounting structure comprises a pair of second slots (14) arranged opposite to each other on the side walls of the lower wiring area (31), and the side edges of the arc-isolating baffle (4) are inserted into the pair of second slots.

10. The circuit breaker built-in arc extinguishing structure according to claim 8, characterized in that: The first arc-extinguishing mesh (51) or the second arc-extinguishing mesh (52) is provided with at least one mounting protrusion that cooperates with and squeezes the inner wall of the first slot (13).

Images