Arc extinguishing air outlet structure for circuit breaker

Abstract

The utility model discloses an arc extinguishing and air outlet structure for a circuit breaker, which comprises a circuit breaker shell (1), an arc extinguishing mechanism (2) is arranged in the middle of the circuit breaker shell (1), an air outlet mechanism is arranged on one side of the arc extinguishing mechanism (2), and an air outlet is arranged on the circuit breaker shell (1) outside the air outlet mechanism. The circuit breaker is characterized in that the air outlet mechanism comprises an arc blocking piece (3) which is connected in the circuit breaker shell (1) in a buckled mode, the middle of the arc blocking piece (3) is detachably connected with a wire clamp (4), two symmetrical air outlet chambers (5) are formed between the side wall of the arc blocking piece (3) and the circuit breaker shell (1) on the two sides, and the inner ends of the air outlet chambers (5) are communicated with an air outlet of the arc extinguishing mechanism (2). And the outer end of the air outlet chamber (5) is communicated with the exhaust port. The utility model has the characteristics that the circuit breaker occupies a small length space and is high in safety.

Description

Technical Field

[0001] The utility model relates to a circuit breaker, in particular to an arc extinguishing and gas discharging structure for a circuit breaker. Background Art

[0002] The existing arc extinguishing and gas discharging structure of a circuit breaker is shown in Patent 201120551922.3, which includes an arc extinguishing mechanism. An air outlet is provided on the circuit breaker housing outside the arc extinguishing mechanism, and an air discharging channel is formed between the air outlet and the arc extinguishing mechanism. Multiple partition plates can be arranged in the air discharging channel as required to separate different arc gases. When in use, after the arc gas is discharged from the arc extinguishing mechanism, it forms multiple airflows through the mutual separation of the partition plates, and then flows in the air discharging channel respectively; when the multiple airflows flow to near the air outlet, they converge again and are discharged together from the air outlet, so as to extend the convergence time of different airflows while achieving the exhaust effect and improve the arc extinguishing effect.

[0003] The defect of the above arc extinguishing and gas discharging structure is that, on the one hand, the air discharging channel will inevitably occupy the length space inside the circuit breaker after being set, and in order to extend the convergence time of the arc gas, the air discharging channel also needs to leave enough air flow distance to ensure its arc extinguishing effect, that is, further increasing the occupied amount of the length space of the circuit breaker, thus causing an increase in the overall length of the circuit breaker. On the other hand, although the partition plates can improve the arc extinguishing effect after being set, they will also occupy the internal space of the air discharging channel, making the already not spacious air discharging channel even narrower; after the width of the air discharging channel becomes narrower, the accommodation capacity and buffering effect on the arc gas will be reduced, not only causing the air pressure to rise rapidly at the moment of opening the circuit breaker, but also the arc gas will be discharged outward at a faster flow rate, thus increasing the fuse distance of the circuit breaker and reducing its safety.

[0004] In addition, the existing arc extinguishing and gas discharging structure of a circuit breaker only has one air outlet after being designed, which makes the arc gas converge again at the air outlet no matter how it is separated and flows after being discharged from the arc extinguishing mechanism, thus increasing the possibility of discharge formed by electrons with larger potential differences converging with the air flow again, and reducing the safety of the circuit breaker.

[0005] Therefore, the existing arc extinguishing and gas discharging structure of a circuit breaker has problems of large occupied length space and low safety. Content of the Utility Model

[0006] The purpose of the utility model is to provide an arc extinguishing and gas discharging structure for a circuit breaker. It has the characteristics of small occupied length space of the circuit breaker and high safety.

[0007] Technical solution of the utility model: An arc extinguishing and air outlet structure for a circuit breaker, comprising a circuit breaker housing. An arc extinguishing mechanism is provided in the middle of the circuit breaker housing. An air outlet mechanism is provided on one side of the arc extinguishing mechanism. An exhaust port is provided on the circuit breaker housing outside the air outlet mechanism. The air outlet mechanism includes an arc blocking member snap-fitted in the circuit breaker housing. A wire clamp is detachably connected to the middle of the arc blocking member. Symmetrical two air outlet chambers are formed between the side wall of the arc blocking member and the circuit breaker housing 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.

[0008] In the above-mentioned arc extinguishing and air outlet structure for a circuit breaker, several air guiding plates are provided at one end of the arc blocking member close to the arc extinguishing mechanism, and air guiding grooves for ventilation are formed between adjacent air guiding plates. Part of the arc gas of the arc extinguishing mechanism enters the air outlet chamber through the air guiding grooves after being discharged.

[0009] In the above-mentioned arc extinguishing and air outlet structure for a circuit breaker, the air guiding plates include a first air guiding plate and a second air guiding plate respectively located in the two air outlet chambers. The first air guiding plate and the second air guiding plate are vertically offset along the height direction of the arc blocking member. A plurality of arc extinguishing grid sheets are arranged side by side in the arc extinguishing mechanism, and arc extinguishing channels are formed between adjacent arc extinguishing grid sheets. The arc gas in adjacent arc extinguishing channels enters the two air outlet chambers respectively after being separated by the first air guiding plate and the second air guiding plate.

[0010] In the above-mentioned arc extinguishing and air outlet structure for a circuit breaker, several first partition plates matching the air guiding grooves are arranged at intervals in the air outlet chamber. The outer side of the first partition plate is attached to the air guiding plate, and different air guiding grooves in the air outlet chamber are separated from each other by the first partition plate and the air guiding plate.

[0011] In the above-mentioned arc extinguishing and air outlet structure for a circuit breaker, the exhaust port includes a first exhaust port and a second exhaust port respectively provided on the circuit breaker housing. The air outlet chamber includes a first air outlet cavity, a second air outlet cavity, a third air outlet cavity and a fourth air outlet cavity which are separated from each other. One side of the first air outlet cavity, the second air outlet cavity, the third air outlet cavity and the fourth air outlet cavity is respectively communicated with part of the air outlet of the arc extinguishing mechanism. The outside of the first air outlet cavity and the second air outlet cavity is communicated with the first exhaust port, and the outside of the third air outlet cavity and the fourth air outlet cavity is communicated with the second exhaust port.

[0012] In the above-mentioned arc extinguishing and air outlet structure for a circuit breaker, a second partition plate connecting the circuit breaker housing is provided in the air outlet chamber, and a second air outlet cavity and a third air outlet cavity are respectively formed on both sides of the second partition plate.

[0013] In the above-mentioned arc extinguishing and gas exhausting structure for a circuit breaker, the first gas exhausting chamber and the second gas exhausting chamber are separated from each other by an arc baffle and the circuit breaker housing near one end close to the arc extinguishing mechanism, and the other ends of the first gas exhausting chamber and the second gas exhausting chamber are communicated with each other. The first exhaust port is located at the end of the first gas exhausting chamber, and the arc gas in the second gas exhausting chamber is discharged outwards through the first gas exhausting chamber and the first exhaust port in sequence.

[0014] In the above-mentioned arc extinguishing and gas exhausting structure for a circuit breaker, an arc extinguishing plate detachably connected to the circuit breaker housing is arranged in the first gas exhausting chamber inside the first exhaust port, and the arc gas in the first gas exhausting chamber and the second gas exhausting chamber passes through the arc extinguishing plate and is discharged outwards during exhaust.

[0015] In the above-mentioned arc extinguishing and gas exhausting structure for a circuit breaker, an exhaust passage is formed inside the second exhaust port. The third gas exhausting chamber and the fourth gas exhausting chamber are separated from each other by an arc baffle and the circuit breaker housing near one end close to the arc extinguishing mechanism, and the other ends of the third gas exhausting chamber and the fourth gas exhausting chamber are communicated with the exhaust passage at the same time.

[0016] In the above-mentioned arc extinguishing and gas exhausting structure for a circuit breaker, the end of the wire clamp extends to the outside of the arc baffle and is located in the exhaust passage, and the arc gas in the third gas exhausting chamber and the fourth gas exhausting chamber passes through the wire clamp and enters the second exhaust port.

[0017] Compared with the prior art, the utility model has the following characteristics:

[0018] (1) Through the structural cooperation of the arc baffle and the circuit breaker housing, the inner side of the arc baffle can be used to install the wire clamp, and the gas exhausting chambers for exhausting gas can be formed at the gaps on both sides of the arc baffle and the circuit breaker housing, so that the gas exhausting chambers and the wire clamp can be arranged side by side in the thickness direction of the circuit breaker, and the arc gas discharged from the arc extinguishing mechanism can be discharged outwards through the gas exhausting chambers on both sides, that is, while realizing the gas exhausting function, the occupation of the length space of the circuit breaker by the gas exhausting mechanism is effectively reduced;

[0019] (2) By wrapping the wire clamp with the arc baffle and symmetrically arranging the gas exhausting chambers in the circuit breaker housing on both sides of the arc baffle, the gas exhausting chambers can also completely cover the internal space of the circuit breaker housing in the height direction, so as to effectively improve the overall gas storage space of the gas exhausting mechanism, achieve the effect of reducing the gas exhausting speed of the arc gas and alleviating the rise of the internal air pressure of the circuit breaker;

[0020] (3) Through the structural cooperation of the air guide plate and the arc extinguishing mechanism, the arc gases in different arc extinguishing channels can be staggered into the two air outlet chambers after being discharged, thereby effectively improving the separation effect on the arc gases and prolonging the time for the arc gases in different arc extinguishing channels to re-converge after separation; on this basis, through the cooperation of the first partition plate and the air guide plate, it is also possible to separate different air guide grooves in each air outlet chamber, that is, to further increase the convergence time of the arc gases in different air guide grooves and improve the arc cutting effect;

[0021] (4) By dividing the air outlet chamber into the first air outlet cavity, the second air outlet cavity, the third air outlet cavity and the fourth air outlet cavity, and splitting the exhaust port into the mutually separated first exhaust port and the second exhaust port, on the one hand, the original single air outlet can be changed into a double air outlet, so that the arc gas volume at each air outlet is only half of the original, effectively improving the safety of the circuit breaker during exhaust; on the other hand, by discharging the arc gases in the first air outlet cavity and the second air outlet cavity through the first exhaust port, and discharging the arc gases in the third air outlet cavity and the fourth air outlet cavity through the second exhaust port, it is also possible to permanently separate the two parts of arc gases with a relatively larger potential difference, and discharge the two parts of arc gases with a relatively smaller potential difference together, thereby further reducing the discharge effect generated after the arc gases in different arc extinguishing channels converge at the air outlet, and further improving the safety of the circuit breaker;

[0022] (5) Through the setting of the arc extinguishing plate, the arc gases discharged from the first air outlet cavity and the second air outlet cavity can be electronically adsorbed and cooled, thereby improving the safety of the arc gases when discharged from the first exhaust port; through the cooperative setting of the exhaust channel and the wire clamp, it is also possible to use the wire clamp made of metal material to electronically adsorb and cool the arc gases discharged from the third air outlet cavity and the fourth air outlet cavity, thereby improving the safety of the arc gases when discharged from the second exhaust port;

[0023] Therefore, the utility model has the characteristics of small occupied space of the circuit breaker length and high safety. Description of the Drawings

[0024] Figure 1 is the structural schematic diagram of the utility model;

[0025] Figure 2 is the partial structural diagram of the circuit breaker housing at the position of the air outlet mechanism;

[0026] Figure 3 is the connection structural diagram of the circuit breaker housing and the arc baffle at the air outlet of the arc extinguishing mechanism;

[0027] Figure 4 is the exploded view of the arc baffle at the connection part.

[0028] The markings in the attached drawings are as follows: 1 - circuit breaker housing, 2 - arc extinguishing mechanism, 3 - arc baffle, 4 - wire clamp, 5 - air outlet chamber, 6 - air guiding plate, 7 - air guiding groove, 8 - first partition board, 9 - first exhaust port, 10 - second exhaust port, 11 - second partition board, 12 - arc extinguishing plate, 13 - exhaust passage, 501 - first air outlet cavity, 502 - second air outlet cavity, 503 - third air outlet cavity, 504 - fourth air outlet cavity, 601 - first air guiding plate, 602 - second air guiding plate. Detailed implementation mode

[0029] The present utility model will be further described below in conjunction with the attached drawings and embodiments, but it shall not be used as a basis for restricting the present utility model.

[0030] Embodiment. An arc extinguishing and air outlet structure for a circuit breaker is configured as Figure 1 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 outlet mechanism is provided on one side of 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 an arc baffle 3 detachably connected inside the circuit breaker housing 1. A wire clamp 4 is detachably connected in the middle of the arc baffle 3. Symmetrical two air outlet chambers 5 are formed between the side wall of the arc baffle 3 and the circuit breaker housing 1 on both sides. The inner end of the air outlet chamber 5 is communicated with the air outlet of the arc extinguishing mechanism 2, and the outer end of the air outlet chamber 5 is communicated with the exhaust port.

[0031] A plurality of air guiding plates 6 are provided at one end of the arc baffle 3 close to the arc extinguishing mechanism 2. The outer end of the guiding part is attached to the arc extinguishing mechanism 2. An air guiding groove 7 for ventilation is formed between adjacent air guiding plates 6. Part of the arc gas discharged from the arc extinguishing mechanism 2 enters the air outlet chamber 5 through the air guiding groove 7.

[0032] The air guiding plates 6 include a first air guiding plate 601 and a second air guiding plate 602 respectively located in the two air outlet chambers 5. The first air guiding plate 601 and the second air guiding plate 602 are vertically offset in the height direction of the arc baffle 3. 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 widths of the first air guiding plate 601 and the second air guiding plate 602 are the same and are half of the width of the arc extinguishing channel. After the first air guiding plate 601 and the second air guiding plate 602 are attached, part of the arc extinguishing channel is blocked. The arc gas in adjacent arc extinguishing channels enters the two air outlet chambers 5 respectively after being separated by the first air guiding plate 601 and the second air guiding plate 602.

[0033] A plurality of first partition boards 8 cooperating with the air guiding grooves 7 are arranged at intervals in the air outlet chamber 5. The outer side of the first partition board 8 is attached to the air guiding plate 6. Different air guiding grooves 7 in the air outlet chamber 5 are separated from each other by the first partition board 8 and the air guiding plate 6.

[0034] The exhaust ports include a first exhaust port 9 and a second exhaust port 10 respectively provided on the circuit breaker housing 1. The first exhaust port 9 and the second exhaust port 10 are respectively located on the upper and lower sides of the circuit breaker housing 1. The gas outlet chamber 5 includes a first gas outlet cavity 501, a second gas outlet cavity 502, a third gas outlet cavity 503 and a fourth gas outlet cavity 504 which are separated from each other. The first gas outlet cavity 501, the second gas outlet cavity 502, the third gas outlet cavity 503 and the fourth gas outlet cavity 504 completely cover the gas outlet of the arc extinguishing mechanism 2 in the height direction. One side of the first gas outlet cavity 501, the second gas outlet cavity 502, the third gas outlet cavity 503 and the fourth gas outlet cavity 504 is respectively communicated with a part of the gas outlet of the arc extinguishing mechanism 2. The outside of the first gas outlet cavity 501 and the second gas outlet cavity 502 is communicated with the first exhaust port 9, and the outside of the third gas outlet cavity 503 and the fourth gas outlet cavity 504 is communicated with the second exhaust port 10.

[0035] A second partition plate 11 connecting the circuit breaker housing 1 is provided in the gas outlet chamber 5. The two sides of the second partition plate 11 respectively form a second gas outlet cavity 502 and a third gas outlet cavity 503. The second gas outlet cavity 502 and the third gas outlet cavity 503 are separated from each other by the second partition plate 11 and are not ventilated with each other.

[0036] The first gas outlet cavity 501 and the second gas outlet cavity 502 are separated from each other by an arc baffle 3 and the circuit breaker housing 1 at one end close to the arc extinguishing mechanism 2. The other ends of the first gas outlet cavity 501 and the second gas outlet cavity 502 are communicated with each other. The first exhaust port 9 is located at the end of the first gas outlet cavity 501. The arc gas in the second gas outlet cavity 502 is discharged outwards through the first gas outlet cavity 501 and the first exhaust port 9 in sequence.

[0037] An arc extinguishing plate 12 detachably connected to the circuit breaker housing 1 is provided in the first gas outlet cavity 501 inside the first exhaust port 9. The arc gas in the first gas outlet cavity 501 and the second gas outlet cavity 502 is discharged outwards through the arc extinguishing plate 12 during exhaust.

[0038] An exhaust channel 13 is formed inside the second exhaust port 10. The third gas outlet cavity 503 and the fourth gas outlet cavity 504 are separated from each other by an arc baffle 3 and the circuit breaker housing 1 at one end close to the arc extinguishing mechanism 2. The other ends of the third gas outlet cavity 503 and the fourth gas outlet cavity 504 are simultaneously communicated with the exhaust channel 13.

[0039] The end of the wire clamp 4 extends to the outside of the arc baffle 3 and is located in the exhaust channel 13. The arc gas in the third gas outlet cavity 503 and the fourth gas outlet cavity 504 passes through the wire clamp 4 and enters the second exhaust port 10.

[0040] Working principle of the present utility model: 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 501, the second gas outlet cavity 502, the third gas outlet cavity 503 and the fourth gas outlet cavity 504 of the two side gas outlet chambers 5 respectively under the guiding action of the gas guiding groove 7 and the outer wall of the arc blocking member 3. Among them, the arc gas in the first gas outlet cavity 501 directly flows towards the first exhaust port 9; the arc gas in the second gas outlet cavity 502 first converges at the rear end of the second gas outlet cavity 502, and then flows through the gap between the arc blocking member 3 and the circuit breaker housing 1 into the first gas outlet cavity 501 at the front end of the arc extinguishing plate 12, and is discharged outwards together with the arc gas in the first gas outlet cavity 501 through the arc extinguishing plate 12 and the first exhaust port 9. The arc extinguishing plate 12 can extinguish the arc gas in the first gas outlet cavity 501 and the second gas outlet cavity 502, improving the safety of the arc gas during discharge.

[0041] The arc gas in the third gas outlet cavity 503 and the fourth gas outlet cavity 504 respectively flows towards the exhaust passage 13, converges at the exhaust passage 13 and is discharged outwards through the wire clamp 4 and the second exhaust port 10. The wire clamp 4 can adsorb and cool the electrons in the arc gas when the arc gas passes through, thus improving the safety of the arc gas during discharge.

[0042] 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 5 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 9 and the second exhaust port 10, 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 discharged outwards from the upper and lower sides of the circuit breaker respectively, so as to achieve complete separation of the two parts of arc gas during the exhaust process, effectively preventing the two parts of arc gas with relatively large potential differences from converging and forming a discharge.

[0043] At the same time, through the gas outlet chamber 5 formed between the arc blocking member 3 and the two side circuit breaker housings 1, the effective utilization of the remaining space between the wire clamp 4 and the circuit breaker housing 1 in the original circuit breaker can be realized, and the space occupied by the gas outlet mechanism in the length direction of the circuit breaker can be reduced accordingly, thereby reducing the overall size of the circuit breaker while improving the gas outlet effect of the circuit breaker.

Claims

1. An arc extinguishing and gas outlet 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 outlet mechanism is provided on one side of the arc extinguishing mechanism (2), and an exhaust port is provided on the circuit breaker housing (1) outside the air outlet mechanism, characterized in that: The air outlet mechanism includes an arc baffle (3) snap-connected inside the circuit breaker housing (1). A wire clamp (4) is detachably connected to the middle of the arc baffle (3). Symmetrical air outlet chambers (5) are formed between the side wall of the arc baffle (3) and the circuit breaker housing (1) on both sides. The inner end of the air outlet chamber (5) is in communication with the air outlet of the arc extinguishing mechanism (2), and the outer end of the air outlet chamber (5) is in communication with the exhaust port.

2. The arc extinguishing and gas outlet structure for a circuit breaker according to claim 1, wherein: The arc baffle (3) is provided with a plurality of air guiding plates (6) distributed at intervals near one end of the arc extinguishing mechanism (2). An air guiding groove (7) for air passage is formed between adjacent air guiding plates (6). Part of the arc gas of the arc extinguishing mechanism (2) enters the air outlet chamber (5) through the air guiding groove (7) after being discharged.

3. The arc extinguishing and gas outlet structure for a circuit breaker according to claim 2, characterized in that: The air guiding plates (6) include a first air guiding plate (601) and a second air guiding plate (602) respectively located in the two air outlet chambers (5). The first air guiding plate (601) and the second air guiding plate (602) are vertically offset along the height direction of the arc baffle (3). 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 (5) respectively after being separated by the first air guiding plate (601) and the second air guiding plate (602).

4. An arc extinguishing and gas exhausting structure for a circuit breaker according to claim 2, characterized in that: A plurality of first partition plates (8) matching the air guiding grooves (7) are arranged at intervals in the air outlet chamber (5). The outer side of the first partition plate (8) is in close contact with the air guiding plate (6). Different air guiding grooves (7) in the air outlet chamber (5) are separated from each other by the first partition plate (8) and the air guiding plate (6).

5. An arc extinguishing gas outlet structure for a circuit breaker according to claim 1, characterized in that: The exhaust port includes a first exhaust port (9) and a second exhaust port (10) respectively arranged on the circuit breaker housing (1). The air outlet chamber (5) includes a first air outlet cavity (501), a second air outlet cavity (502), a third air outlet cavity (503) and a fourth air outlet cavity (504) which are separated from each other. One side of the first air outlet cavity (501), the second air outlet cavity (502), the third air outlet cavity (503) and the fourth air outlet cavity (504) is respectively in communication with part of the air outlet of the arc extinguishing mechanism (2). The outside of the first air outlet cavity (501) and the second air outlet cavity (502) is in communication with the first exhaust port (9), and the outside of the third air outlet cavity (503) and the fourth air outlet cavity (504) is in communication with the second exhaust port (10).

6. The arc extinguishing and gas exhausting structure for a circuit breaker according to claim 5, characterized in that: A second partition plate (11) connecting the circuit breaker housing (1) is arranged in the air outlet chamber (5). The second air outlet cavity (502) and the third air outlet cavity (503) are respectively formed on both sides of the second partition plate (11).

7. An arc extinguishing and gas exhausting structure for a circuit breaker according to claim 5, characterized in that: The first air outlet cavity (501) and the second air outlet cavity (502) are separated from each other by the arc baffle (3) and the circuit breaker housing (1) near one end of the arc extinguishing mechanism (2). The other ends of the first air outlet cavity (501) and the second air outlet cavity (502) are in communication with each other. The first exhaust port (9) is located at the end of the first air outlet cavity (501). The arc gas in the second air outlet cavity (502) is discharged outwards through the first air outlet cavity (501) and the first exhaust port (9) in sequence.

8. An arc extinguishing and gas exhausting structure for a circuit breaker according to claim 7, characterized in that: An arc extinguishing plate (12) detachably connected to the circuit breaker housing (1) is provided in the first air outlet cavity (501) inside the first exhaust port (9). The arc gas in the first air outlet cavity (501) and the second air outlet cavity (502) is discharged outward through the arc extinguishing plate (12) during exhaust.

9. An arc extinguishing and gas exhausting structure for a circuit breaker according to claim 5, characterized in that: An exhaust passage (13) is formed inside the second exhaust port (10). The third air outlet cavity (503) and the fourth air outlet cavity (504) are separated from each other by a arc blocking member (3) and the circuit breaker housing (1) at one end close to the arc extinguishing mechanism (2), and the other ends of the third air outlet cavity (503) and the fourth air outlet cavity (504) are simultaneously communicated with the exhaust passage (13).

10. The arc extinguishing air outlet structure for a circuit breaker according to claim 9, characterized in that: The end of the wire clamp (4) extends to the outside of the arc blocking member (3) and is located in the exhaust passage (13). The arc gas in the third air outlet cavity (503) and the fourth air outlet cavity (504) passes through the wire clamp (4) and enters the second exhaust port (10).

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