Magnetic blow-out structure for circuit breaker

Abstract

The utility model discloses a magnetic blow-out structure for a circuit breaker, which comprises a circuit breaker shell (1), an arc extinguishing mechanism (2) arranged in the middle of the circuit breaker shell (1), an air inlet chamber (3) arranged on one side of the arc extinguishing mechanism (2), and a static contact (4) arranged in the air inlet chamber (3) and detachably connected with the circuit breaker shell (1), and is characterized in that the outside of the static contact (4) is detachably connected with an arc isolating wall; the arc-isolating wall is formed by buckling two split arc-isolating plates (5), an air inlet chamber (3) is formed in the middle of the arc-isolating wall, two symmetrical magnetic conductive sheets (6) are connected to the outer walls of the two sides of the arc-isolating wall, the two magnetic conductive sheets (6) are attached to each other outside the air inlet chamber (3) and form a magnetic ring with a U-shaped section, and the magnetic ring and the air inlet chamber (3) are separated from each other. The utility model has the characteristics of good magnetic conduction effect and convenience in installation.

Description

Technical Field

[0001] The utility model relates to a circuit breaker, in particular to a magnetic blow structure for a circuit breaker. Background Art

[0002] When the moving and static contacts of a circuit breaker are opened instantaneously, a large amount of electric arcs and high-temperature gases will be formed. The high-temperature gases with electric arcs will impact the surrounding parts, causing breakdown damage to the impacted surface. To solve this problem, Patent 202320412560.2 provides a magnetic blow structure for a circuit breaker. By installing arc isolation plates made of plastic material in the circuit breaker housing on both sides of the static contact, the arc isolation plates can shield the outside circuit breaker housing to prevent the arc gas from directly contacting the side wall of the circuit breaker housing and causing breakdown. On this basis, by installing magnetic conduction plates made of metal magnetization material outside the arc isolation plates, the magnetic conduction plates can also play an arc guiding role after installation, thereby accelerating the flow speed of the electric arc towards the arc extinguishing mechanism.

[0003] However, the defect of this structure is that, on the one hand, the magnetic conduction plates distributed on the two sides of the circuit breaker housing cannot achieve the best arc guiding effect, and on the other hand, since the arc isolation plates cannot be completely fixed to components such as the circuit breaker housing and the static contact during assembly, the assembly difficulty of this structure for operators is increased.

[0004] Therefore, the existing magnetic blow structure of the circuit breaker has problems of poor magnetic conduction effect and inconvenient installation. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a magnetic blow structure for a circuit breaker, which has the characteristics of good magnetic conduction effect and convenient installation.

[0006] The technical solution of the utility model: A magnetic blow structure for a circuit breaker includes a circuit breaker housing. An arc extinguishing mechanism is provided in the middle of the circuit breaker housing. An air inlet chamber is on one side of the arc extinguishing mechanism. A static contact detachably connected to the circuit breaker housing is provided in the air inlet chamber. An arc isolation wall is detachably connected to the outside of the static contact. The arc isolation wall is formed by two split arc isolation plates buckling with each other. An air inlet chamber is formed in the middle of the arc isolation wall. Two symmetrical magnetic conduction sheets are connected to the outer walls on both sides of the arc isolation wall. The two magnetic conduction sheets are mutually attached outside the air inlet chamber and form a magnetic ring with a U-shaped cross section. The magnetic ring and the air inlet chamber are separated from each other.

[0007] In the aforementioned magnetic blow structure for a circuit breaker, an opening is provided on one side of the arc isolation plate. A bending part is formed at the end of the magnetic conduction sheet. The bending parts of the two magnetic conduction sheets on both sides pass through the arc isolation plate through the opening and are mutually attached.

[0008] In the aforementioned magnetic blow structure for a circuit breaker, a baffle is provided on the arc isolation plate outside the air inlet chamber. The baffles on the two arc isolation plates on both sides are mutually attached. The air inlet chamber and the magnetic ring are separated from each other through the baffle.

[0009] In the above-mentioned magnetic blow structure for a circuit breaker, an arc ignition groove is provided in the middle of the baffle edge. An arc ignition plate is connected by buckling through the arc ignition groove between the two arc separating plates. One end of the arc ignition plate passes through the arc separating wall and extends below the arc extinguishing mechanism. The arc ignition plate and the air inlet chamber are separated from each other by the baffle edge.

[0010] In the above-mentioned magnetic blow structure for a circuit breaker, the bent part is located on the side of the arc ignition plate away from the air inlet chamber. The bent part and the arc ignition plate are separated from each other by the baffle edge.

[0011] In the above-mentioned magnetic blow structure for a circuit breaker, a fixing part for buckling and connecting a static contact is provided on the arc separating plate. The two arc separating plates are buckled with each other through the fixing part. One end of the static contact passes through the fixing part and extends into the air inlet chamber.

[0012] In the above-mentioned magnetic blow structure for a circuit breaker, an air outlet mechanism located inside the circuit breaker housing is provided on the side of the arc extinguishing mechanism away from the air inlet chamber. An exhaust port is provided on the circuit breaker housing outside the air outlet mechanism. The air outlet mechanism includes an arc blocking part buckled and connected inside the circuit breaker housing. A wire clamp is detachably connected to the middle of the arc blocking part. Symmetrical two air outlet chambers are formed between the side wall of the arc blocking part and the two circuit breaker housings on both sides. The inner end of the air outlet chamber is communicated with the air outlet of the arc extinguishing mechanism, and the outer end of the air outlet chamber is communicated with the exhaust port.

[0013] In the above-mentioned magnetic blow structure for a circuit breaker, several gas guiding plates are provided at one end of the arc blocking part close to the arc extinguishing mechanism, and gas guiding grooves for ventilation are formed between adjacent gas guiding plates. Part of the arc gas of the arc extinguishing mechanism enters the air outlet chamber through the gas guiding groove after being discharged.

[0014] In the above-mentioned magnetic blow structure for a circuit breaker, the gas guiding plates include a first gas guiding plate and a second gas guiding plate respectively located in the two air outlet chambers. The first gas guiding plate and the second gas guiding plate are distributed in a vertically staggered manner along the height direction of the arc blocking part. A plurality of arc extinguishing grid plates are arranged side by side in the arc extinguishing mechanism, and arc extinguishing channels are formed between adjacent arc extinguishing grid plates. The arc gas in adjacent arc extinguishing channels enters the two air outlet chambers respectively after being separated by the first gas guiding plate and the second gas guiding plate.

[0015] In the above-mentioned magnetic blow structure for a circuit breaker, a number of first partition plates matching the gas guiding grooves are arranged at intervals in the air outlet chamber. The outer side of the first partition plate is attached to the gas guiding plate. Different gas guiding grooves in the air outlet chamber are separated from each other by the first partition plate and the gas guiding plate.

[0016] Compared with the prior art, the present utility model has the following characteristics:

[0017] (1) Through the structural cooperation of the arc isolation wall and the magnetic conduction sheet, the magnetic conduction sheets on the two arc isolation plates can be mutually attached to form a U-shaped magnetic ring structure, thereby forming a magnetic field outside the air inlet chamber, effectively improving the arc ignition effect on the arc gas; on this basis, through the setting of the baffle edge, the air inlet chamber and the magnetic conduction sheet can be mutually separated, thus ensuring its safety;

[0018] (2) Through the structural cooperation of the arc ignition groove and the arc ignition plate, the arc ignition effect on the arc gas in the air inlet chamber can be improved, enabling the arc gas to quickly enter the arc extinguishing mechanism under the guiding action;

[0019] (3) Through the structural cooperation of the fixing part and the static contact, the two arc isolation plates can also be mutually buckled outside the static contact during installation, that is, the mutual fixation of the static contact and the arc isolation wall is realized. This enables the circuit breaker to use the static contact to install and fix the arc isolation plate during installation, thus facilitating the installation by the operators;

[0020] (4) Through the structural cooperation of the arc blocking part and the circuit breaker housing, the inner side of the arc blocking part can be used to install the wire clamp, and the gap on both sides of the arc blocking part and the circuit breaker housing can form an air outlet chamber for exhausting gas, so that the air outlet chamber and the wire clamp can be arranged side by side along the thickness direction of the circuit breaker, and the arc gas discharged from the arc extinguishing mechanism can be discharged outward through the air outlet chambers on both sides, that is, while realizing the exhaust function, effectively reducing the occupation of the length space of the circuit breaker by the air outlet mechanism;

[0021] (5) By wrapping the wire clamp with the arc blocking part and symmetrically arranging the air outlet chamber in the circuit breaker housing on both sides of the arc blocking part, the air outlet chamber can also completely cover the internal space of the circuit breaker housing along the height direction, thereby effectively increasing the overall gas storage space of the air outlet mechanism, achieving the effect of reducing the air outlet speed of the arc gas and alleviating the rise of the internal air pressure of the circuit breaker;

[0022] Therefore, the present utility model has the characteristics of good magnetic conduction effect and convenient installation. Description of the Drawings

[0023] Figure 1 is the structural schematic diagram of Embodiment 1;

[0024] Figure 2 is the connection structure diagram of the static contact, the arc isolation wall, the magnetic conduction sheet and the arc ignition plate;

[0025] Figure 3 is Figure 2 the exploded view of

[0026] Figure 4 is Figure 2 the sectional view of

[0027] Figure 5 is the structural schematic diagram of Embodiment 2;

[0028] Figure 6 It is a partial structural diagram of the circuit breaker housing at the air outlet mechanism in Embodiment 2;

[0029] Figure 7 It is a connection structural diagram of the circuit breaker housing and the arc blocking member at the arc extinguishing mechanism air outlet in Embodiment 2;

[0030] Figure 8 It is an exploded view of the arc blocking member at the connection in Embodiment 2.

[0031] The reference numerals in the drawings are: 1 - circuit breaker housing, 2 - arc extinguishing mechanism, 3 - intake chamber, 4 - static contact, 5 - arc separating plate, 6 - magnetic conductive sheet, 7 - opening, 8 - retaining edge, 9 - arc leading groove, 10 - arc leading plate, 11 - fixing part, 12 - arc blocking member, 13 - wire clamp, 14 - air outlet chamber, 15 - air guiding plate, 16 - air guiding groove, 17 - first partition plate, 18 - first exhaust port, 19 - second exhaust port, 20 - second partition plate, 21 - arc extinguishing plate, 22 - exhaust passage, 141 - first air outlet cavity, 142 - second air outlet cavity, 143 - third air outlet cavity, 144 - fourth air outlet cavity, 151 - first air guiding plate, 152 - second air guiding plate. Detailed implementation manners

[0032] The present utility model will be further described below in conjunction with the drawings and embodiments, but it shall not be used as a basis for limiting the present utility model.

[0033] Embodiment 1. A magnetic blow structure for a circuit breaker, the structure is as Figure 1-4 shown, including a circuit breaker housing 1, an arc extinguishing mechanism 2 is provided in the middle of the circuit breaker housing 1, an intake chamber 3 is provided on one side of the arc extinguishing mechanism 2, a static contact 4 detachably connected to the circuit breaker housing 1 is provided in the intake chamber 3, a partition wall is detachably connected to the outside of the static contact 4, the partition wall is formed by buckling two split arc separating plates 5, an intake chamber 3 is formed in the middle of the partition wall, and two symmetric magnetic conductive sheets 6 are connected to the outer walls on both sides of the partition wall. The two magnetic conductive sheets 6 are mutually attached outside the intake chamber 3 to form a magnetic ring with a U-shaped cross section, and the magnetic ring and the intake chamber 3 are mutually separated.

[0034] An opening 7 is provided on one side of the arc separating plate 5, a bent portion is formed at the end of the magnetic conductive sheet 6, and the bent portions of the two magnetic conductive sheets 6 on both sides pass through the arc separating plate 5 through the opening 7 and are mutually attached.

[0035] A strip-shaped retaining edge 8 is provided on the arc separating plate 5 outside the intake chamber 3, the retaining edges 8 of the two arc separating plates 5 on both sides are mutually attached, and the intake chamber 3 and the magnetic ring are mutually separated by the retaining edge 8.

[0036] An arc starting groove 9 is provided in the middle of the rib 8. An arc starting plate 10 is connected by buckling between the two arc separating plates 5 through the arc starting groove 9. One end of the arc starting plate 10 passes through the arc separating wall and extends below the arc extinguishing mechanism 2. The arc starting plate 10 and the air inlet chamber 3 are separated from each other by the rib 8.

[0037] The bending part is located on the side of the arc starting plate 10 away from the air inlet chamber 3. The bending part and the arc starting plate 10 are separated from each other by the rib 8.

[0038] A fixing part 11 for buckling and connecting the static contact 4 is provided on the arc separating plate 5. The two arc separating plates 5 are buckled to each other through the fixing part 11. One end of the static contact 4 passes through the fixing part 11 and extends into the air inlet chamber 3.

[0039] During the installation of this embodiment, first, the magnetic conductive sheet 6 is buckled and fixed on the outer wall of the arc separating plate 5, and then the two arc separating plates 5 are sleeved outside the static contact 4 and buckled and fixed to each other, so that the arc separating plate 5 can be limited by the static contact 4, which is convenient for the manufacturer to assemble. After the two arc separating plates 5 are buckled to each other, on the one hand, they can buckle and fix the arc starting plate 10, and on the other hand, they can make the ends of the two magnetic conductive sheets 6 fit together, so as to form a U-shaped magnetic ring structure and wrap it outside the air inlet chamber 3.

[0040] When the circuit breaker opens, a large amount of arc gas is generated in the air inlet chamber 3 after the static contact 4 and the moving contact are separated. At this time, a magnetic field can be formed outside the air inlet chamber 3 through the magnetic ring, so as to cooperate with the arc starting plate 10 to make the arc gas in the air inlet chamber 3 enter the arc extinguishing mechanism 2 more quickly, achieving the arc starting effect.

[0041] Embodiment 2. A magnetic blow structure for a circuit breaker, the structure is as Figure 2-8 shown, including a circuit breaker housing 1. An arc extinguishing mechanism 2 is provided in the middle of the circuit breaker housing 1. An air inlet chamber 3 is provided on one side of the arc extinguishing mechanism 2. A static contact 4 detachably connected to the circuit breaker housing 1 is provided in the air inlet chamber 3. The outside of the static contact 4 is detachably connected with an arc separating wall. The arc separating wall is formed by buckling two split arc separating plates 5. The middle of the arc separating wall forms the air inlet chamber 3. Symmetric two magnetic conductive sheets 6 are connected to the outer walls on both sides of the arc separating wall. The two magnetic conductive sheets 6 are mutually attached outside the air inlet chamber 3 and form a magnetic ring with a U-shaped cross section. The magnetic ring and the air inlet chamber 3 are separated from each other.

[0042] An opening 7 is provided on one side of the arc separating plate 5. The end of the magnetic conductive sheet 6 forms a bending part. The bending parts of the two magnetic conductive sheets 6 pass through the arc separating plate 5 through the opening 7 and are mutually attached.

[0043] A strip-shaped rib 8 is provided on the arc separating plate 5 outside the air inlet chamber 3. The ribs 8 on the two arc separating plates 5 are mutually attached. The air inlet chamber 3 and the magnetic ring are separated from each other by the rib 8.

[0044] An arc starting groove 9 is provided in the middle of the rib 8. An arc starting plate 10 is buckled and connected between the two arc separating plates 5 through the arc starting groove 9. One end of the arc starting plate 10 passes through the arc separating wall and extends below the arc extinguishing mechanism 2. The arc starting plate 10 and the air inlet chamber 3 are separated from each other by the rib 8.

[0045] The bending part is located on the side of the arc starting plate 10 away from the air inlet chamber 3. The bending part and the arc starting plate 10 are separated from each other by the rib 8.

[0046] The arc separating plate 5 is provided with a fixing part 11 for buckling and connecting the static contact 4. The two arc separating plates 5 are buckled with each other through the fixing part 11. One end of the static contact 4 passes through the fixing part 11 and extends into the air inlet chamber 3.

[0047] On the side of the arc extinguishing mechanism 2 away from the air inlet chamber 3, an air outlet mechanism located inside the circuit breaker housing 1 is provided. An exhaust port is provided on the circuit breaker housing 1 outside the air outlet mechanism. The air outlet mechanism includes an arc blocking part 12 buckled and connected inside the circuit breaker housing 1. A wire clip 13 is detachably connected to the middle of the arc blocking part 12. Symmetrical two air outlet chambers 14 are formed between the side wall of the arc blocking part 12 and the two circuit breaker housings 1 on both sides. The inner end of the air outlet chamber 14 is communicated with the air outlet of the arc extinguishing mechanism 2, and the outer end of the air outlet chamber 14 is communicated with the exhaust port.

[0048] The arc blocking part 12 is provided with a plurality of gas guiding plates 15 distributed at intervals near the arc extinguishing mechanism 2. A gas guiding groove 16 for ventilation is formed between adjacent gas guiding plates 15. Part of the arc gas of the arc extinguishing mechanism 2 enters the air outlet chamber 14 through the gas guiding groove 16 after being discharged.

[0049] The gas guiding plates 15 include a first gas guiding plate 151 and a second gas guiding plate 152 respectively located in the two air outlet chambers 14. The first gas guiding plate 151 and the second gas guiding plate 152 are distributed in a vertically staggered manner along the height direction of the arc blocking part 12. A plurality of arc extinguishing grids are arranged side by side in the arc extinguishing mechanism 2. An arc extinguishing channel is formed between adjacent arc extinguishing grids. The arc gas in adjacent arc extinguishing channels enters the two air outlet chambers 14 respectively after being separated by the first gas guiding plate 151 and the second gas guiding plate 152.

[0050] A plurality of first partition plates 17 are arranged at intervals in the air outlet chamber 14 and are matched with the gas guiding grooves 16. The outer side of the first partition plate 17 is attached to the gas guiding plate 15. Different gas guiding grooves 16 in the air outlet chamber 14 are separated from each other by the first partition plate 17 and the gas guiding plate 15.

[0051] The exhaust ports include a first exhaust port 18 and a second exhaust port 19 respectively provided on the circuit breaker housing 1. The air outlet chamber 14 includes a first air outlet cavity 141, a second air outlet cavity 142, a third air outlet cavity 143, and a fourth air outlet cavity 144 that are separated from each other. One side of the first air outlet cavity 141, the second air outlet cavity 142, the third air outlet cavity 143, and the fourth air outlet cavity 144 is respectively in communication with a partial air outlet of the arc extinguishing mechanism 2. The outside of the first air outlet cavity 141 and the second air outlet cavity 142 is in communication with the first exhaust port 18, and the outside of the third air outlet cavity 143 and the fourth air outlet cavity 144 is in communication with the second exhaust port 19.

[0052] A second partition plate 20 connecting the circuit breaker housing 1 is provided in the air outlet chamber 14. The second air outlet cavity 142 and the third air outlet cavity 143 are respectively formed on both sides of the second partition plate 20.

[0053] The first air outlet cavity 141 and the second air outlet cavity 142 are separated from each other by the arc blocking member 12 and the circuit breaker housing 1 at one end close to the arc extinguishing mechanism 2. The other ends of the first air outlet cavity 141 and the second air outlet cavity 142 are in communication with each other. The first exhaust port 18 is located at the end of the first air outlet cavity 141. The arc gas in the second air outlet cavity 142 is discharged outward through the first air outlet cavity 141 and the first exhaust port 18 in sequence.

[0054] An arc extinguishing plate 21 detachably connected to the circuit breaker housing 1 is provided in the first air outlet cavity 141 inside the first exhaust port 18. The arc gas in the first air outlet cavity 141 and the second air outlet cavity 142 is discharged outward through the arc extinguishing plate 21 during exhaust.

[0055] An exhaust passage 22 is formed inside the second exhaust port 19. The third air outlet cavity 143 and the fourth air outlet cavity 144 are separated from each other by the arc blocking member 12 and the circuit breaker housing 1 at one end close to the arc extinguishing mechanism 2. The other ends of the third air outlet cavity 143 and the fourth air outlet cavity 144 are simultaneously in communication with the exhaust passage 22.

[0056] The end of the wire clamp 13 extends to the outside of the arc blocking member 12 and is located in the exhaust passage 22. The arc gas in the third air outlet cavity 143 and the fourth air outlet cavity 144 passes through the wire clamp 13 and enters the second exhaust port 19.

[0057] Compared with Embodiment 1, in this embodiment, by providing an air outlet mechanism at the rear end of the arc extinguishing mechanism 2, on the one hand, the air outlet mechanism can improve its arc extinguishing effect, and on the other hand, it can effectively utilize the remaining space between the wire clamp 13 and the circuit breaker housing 1, and accordingly reduce the space occupied by the air outlet mechanism in the length direction of the circuit breaker, thereby reducing the overall size of the circuit breaker while ensuring the air outlet effect of the circuit breaker.

[0058] After the arc gas in the arc extinguishing mechanism 2 exits, the arc gas in different arc extinguishing channels enters the first gas outlet cavity 141, the second gas outlet cavity 142, the third gas outlet cavity 143, and the fourth gas outlet cavity 144 of the two-side gas outlet chambers 14 respectively under the guiding action of the gas guiding groove 16 and the outer wall of the arc blocking member 12. Among them, the arc gas in the first gas outlet cavity 141 directly flows towards the first exhaust port 18; the arc gas in the second gas outlet cavity 142 first converges at the rear end of the second gas outlet cavity 142, and then flows through the gap between the arc blocking member 12 and the circuit breaker housing 1 into the first gas outlet cavity 141 at the front end of the arc extinguishing plate 21, and is discharged outwards together with the arc gas in the first gas outlet cavity 141 through the arc extinguishing plate 21 and the first exhaust port 18. The arc extinguishing plate 21 can extinguish the arc gas in the first gas outlet cavity 141 and the second gas outlet cavity 142, improving the safety of the arc gas during discharge.

[0059] The arc gas in the third gas outlet cavity 143 and the fourth gas outlet cavity 144 respectively flows towards the exhaust passage 22, converges at the exhaust passage 22 and then is discharged outwards through the wire clamp 13 and the second exhaust port 19. The wire clamp 13 can adsorb and cool the electrons in the arc gas when the arc gas passes through, thereby improving the safety of the arc gas during discharge.

[0060] With the above cooperation, the arc gas of the present utility model can be cut into eight parts after being discharged from the arc extinguishing mechanism 2 and enter the respective gas outlet cavities of the two gas outlet chambers 14 respectively, thereby effectively prolonging the convergence time of the arc gas in different gas outlet cavities and improving the arc extinguishing effect of cutting the arc gas. On this basis, through the settings of the first exhaust port 18 and the second exhaust port 19, the arc gas on the upper and lower sides of the arc extinguishing mechanism 2 can be separated from each other after being discharged through the separation of the circuit breaker housing 1 and the arc extinguishing mechanism 2, and are respectively discharged outwards from the upper and lower sides of the circuit breaker, thereby realizing the complete separation of the two parts of arc gas during the exhaust process and effectively preventing the two parts of arc gas with relatively large potential differences from converging and forming a discharge.

Claims

1. A magnetic blowout structure for a circuit breaker, comprising a circuit breaker housing (1), an arc extinguishing mechanism (2) is provided in the middle of the circuit breaker housing (1), an air inlet chamber (3) is provided on one side of the arc extinguishing mechanism (2), and a stationary contact (4) detachably connected to the circuit breaker housing (1) is provided in the air inlet chamber (3), characterized in that: An arc isolation wall is detachably connected to the outside of the static contact (4). The arc isolation wall is formed by buckling two split arc isolation plates (5). An air inlet chamber (3) is formed in the middle of the arc isolation wall. Two symmetric magnetic conduction sheets (6) are connected to the outer walls on both sides of the arc isolation wall. The two magnetic conduction sheets (6) are attached to each other outside the air inlet chamber (3) to form a magnetic ring with a U-shaped cross section. The magnetic ring and the air inlet chamber (3) are separated from each other.

2. The magnetic blow structure for a circuit breaker according to claim 1, wherein: An opening (7) is provided on one side of the arc isolation plate (5). The end of the magnetic conduction sheet (6) forms a bent part. The bent parts of the magnetic conduction sheets (6) on both sides pass through the arc isolation plate (5) through the opening (7) and are attached to each other.

3. The magnetic blow structure for a circuit breaker according to claim 2, characterized in that: A baffle (8) is provided on the arc isolation plate (5) outside the air inlet chamber (3). The baffles (8) on both sides of the arc isolation plate (5) are attached to each other. The air inlet chamber (3) and the magnetic ring are separated from each other through the baffle (8).

4. The magnetic blow structure for a circuit breaker according to claim 3, wherein: An arc ignition groove (9) is provided in the middle of the baffle (8). An arc ignition plate (10) is buckled and connected between the two arc isolation plates (5) through the arc ignition groove (9). One end of the arc ignition plate (10) passes through the arc isolation wall and extends below the arc extinguishing mechanism (2). The arc ignition plate (10) and the air inlet chamber (3) are separated from each other through the baffle (8).

5. A magnetic blowout structure for a circuit breaker according to claim 4, characterized in that: The bent part is located on the side of the arc ignition plate (10) away from the air inlet chamber (3). The bent part and the arc ignition plate (10) are separated from each other through the baffle (8).

6. The magnetic blow structure for a circuit breaker according to claim 1, characterized in that: A fixing part (11) for buckling and connecting the static contact (4) is provided on the arc isolation plate (5). The two arc isolation plates (5) are buckled to each other through the fixing part (11). One end of the static contact (4) passes through the fixing part (11) and extends into the air inlet chamber (3).

7. A magnetic blowout structure for a circuit breaker according to claim 1, characterized in that: On the side away from the air inlet chamber (3), an air outlet mechanism located in the circuit breaker housing (1) is provided on the arc extinguishing mechanism (2). An exhaust port is provided on the circuit breaker housing (1) outside the air outlet mechanism. The air outlet mechanism includes a arc blocking part (12) buckled and connected in the circuit breaker housing (1). A wire clamp (13) is detachably connected to the middle of the arc blocking part (12). Symmetric two air outlet chambers (14) are formed between the side wall of the arc blocking part (12) and the circuit breaker housing (1) on both sides. The inner end of the air outlet chamber (14) is communicated with the air outlet of the arc extinguishing mechanism (2). The outer end of the air outlet chamber (14) is communicated with the exhaust port.

8. A magnetic blowout structure for a circuit breaker according to claim 7, characterized in that: A plurality of air guiding plates (15) are provided at one end of the arc blocking part (12) close to the arc extinguishing mechanism (2) at intervals. An air guiding groove (16) for air ventilation is formed between adjacent air guiding plates (15). Part of the arc gas of the arc extinguishing mechanism (2) enters the air outlet chamber (14) through the air guiding groove (16) after being discharged.

9. A magnetic blowout structure for a circuit breaker according to claim 8, wherein: The air guiding plate (15) includes a first air guiding plate (151) and a second air guiding plate (152) respectively located in the two air outlet chambers (14). The first air guiding plate (151) and the second air guiding plate (152) are vertically offset along the height direction of the arc blocking part (12). A plurality of arc extinguishing grid sheets are arranged side by side in the arc extinguishing mechanism (2). An arc extinguishing channel is formed between adjacent arc extinguishing grid sheets. The arc gas in adjacent arc extinguishing channels enters the two air outlet chambers (14) respectively after being separated by the first air guiding plate (151) and the second air guiding plate (152).

10. A magnetic blowout structure for a circuit breaker according to claim 8, characterized in that: The air outlet chamber (14) is provided with a plurality of first partition plates (17) spaced apart and provided with cooperating air guiding grooves (16). The outer side of the first partition plate (17) is in close contact with the air guiding plate (15). Different air guiding grooves (16) in the air outlet chamber (14) are separated from each other by the first partition plate (17) and the air guiding plate (15).

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