Double-arc-extinguishing multi-pole circuit breaker

Abstract

The utility model discloses a double-arc-extinguishing type multi-pole circuit breaker, which comprises a circuit breaker, an actuating mechanism is arranged in the middle of the circuit breaker, an L-pole moving contact assembly and an N-pole moving contact assembly are respectively arranged on two sides of the actuating mechanism, an L-pole arc-extinguishing chamber is arranged outside the L-pole moving contact assembly, an L-pole protective cover is arranged in the L-pole arc-extinguishing chamber, and an N-pole protective cover is arranged in the N-pole moving contact assembly. An N-pole arc extinguish chamber is arranged outside the N-pole moving contact assembly, an N-pole arc extinguish cover is arranged in the N-pole arc extinguish chamber, the L-pole arc extinguish chamber and the N-pole arc extinguish chamber are separated from each other through a partition plate, and guide rib sets connected with the partition plate are arranged on the sides, away from the executing mechanism, of the L-pole arc extinguish cover and the N-pole arc extinguish cover. The guide rib set comprises a plurality of guide ribs arranged at intervals, and guide channels allowing airflow to penetrate through are formed in the two sides of the guide ribs. According to the utility model, the arc extinguishing effect of the arc extinguishing chamber on the arc can be improved, the smoothness of discharging the arc gas out of the arc extinguishing chamber is improved, and the temperature of the arc extinguishing chamber is reduced.

Description

Technical Field

[0001] The utility model relates to a multi-pole circuit breaker, in particular to a double arc-extinguishing multi-pole circuit breaker. Background Art

[0002] When the circuit breaker is opened, a large amount of arc will be generated between the moving contact and the static contact, so the circuit breaker needs to install an arc extinguishing hood on one side of the static contact, so that after the moving and static contacts are opened and arc gas is generated, the arc gas enters the arc extinguishing hood through the guidance of the circuit breaker housing, and then the arc is cut off by the arc extinguishing grids arranged side by side in the arc extinguishing hood to achieve the arc extinguishing effect. After the arc extinguishing gas is discharged from the tail of the arc extinguishing hood, it is directly discharged from the exhaust port along the channel at the tail of the circuit breaker housing.

[0003] However, the defect of the existing arc extinguishing system is that, due to the layout restrictions of the functional parts in the circuit breaker, the installation position of the arc extinguishing hood is offset relative to the static contact, which makes the arc gas generated by the opening of the gate enter the arc extinguishing hood along the circuit breaker housing. It cannot evenly enter the arc extinguishing grids of the arc extinguishing hood, but will enter the arc extinguishing grid closer to the static contact, thereby reducing the arc extinguishing effect of the arc extinguishing hood on the arc gas. Secondly, when the arc gas is discharged from the tail of the arc extinguishing hood, on the one hand, it will flow in the direction of the exhaust port of the circuit breaker, thereby causing mutual interference of the arc gas at the exhaust port, affecting its gas outlet stability; on the other hand, the arc gas will form a number of short arcs after being cut by the arc extinguishing hood, and the short arcs will easily re-aggregate and form a series connection in the circuit breaker housing at the rear end of the arc extinguishing hood after being discharged from the arc extinguishing hood, thereby causing the circuit breaker housing at that location to be punctured, reducing its arc extinguishing stability.

[0004] Therefore, the arc extinguishing system of the existing circuit breaker has the problem of poor arc extinguishing and arc striking effects. Utility Model Content

[0005] The utility model aims to provide a double arc-extinguishing multi-pole circuit breaker, which can improve the arc-extinguishing effect of the arc-extinguishing hood on the arc, improve the smoothness of the arc gas when it is discharged from the arc-extinguishing hood, and reduce the temperature of the arc-extinguishing chamber.

[0006] The technical solution of the utility model is as follows: a double arc-extinguishing multi-pole circuit breaker comprises a circuit breaker, an actuator is arranged in the middle of the circuit breaker, an L-pole moving contact assembly and an N-pole moving contact assembly are arranged on both sides of the actuator respectively, an L-pole arc-extinguishing chamber is arranged outside the L-pole moving contact assembly, an L-pole arc-extinguishing shield is arranged inside the L-pole arc-extinguishing chamber, an N-pole arc-extinguishing chamber is arranged outside the N-pole moving contact assembly, an N-pole arc-extinguishing shield is arranged inside the N-pole arc-extinguishing chamber, the L-pole arc-extinguishing chamber and the N-pole arc-extinguishing chamber are separated from each other by a partition, and the L-pole extinguishing shield and the N-pole extinguishing shield are both provided with a guide rib group connected to the partition on the side away from the actuator; the guide rib group comprises a plurality of guide ribs arranged at intervals, guide channels for airflow to pass through are formed on both sides of the guide ribs, one end of the guide channel faces the L-pole extinguishing shield or the N-pole extinguishing shield, the plurality of guide channels completely cover the air outlet of the L-pole extinguishing shield or the N-pole extinguishing shield, and the other end of the guide channel faces the exhaust port of the circuit breaker.

[0007] In the aforementioned double arc-extinguishing multi-pole circuit breaker, some guide ribs are provided with an intercepting portion at one end close to the exhaust port, the end of the intercepting portion extends toward the guide channel and blocks the guide channel, and air outlets for ventilation are formed between adjacent intercepting portions and between the intercepting portions and the guide ribs, and the width of the air outlets is smaller than the width of the guide channel.

[0008] In the aforementioned double arc-extinguishing multi-pole circuit breaker, an angle is formed between the direction of the air outlet and the air outlet direction of the exhaust port.

[0009] In the aforementioned double arc-extinguishing multi-pole circuit breaker, the L-pole arc-extinguishing chamber forms an L-pole air inlet channel at the interval between the L-pole moving contact assembly and the L-pole extinguishing shield, and the N-pole arc-extinguishing chamber forms an N-pole air inlet channel at the interval between the N-pole moving contact assembly and the N-pole extinguishing shield. Cutting portions connecting partitions are respectively provided in the L-pole air inlet channel and the N-pole air inlet channel. The cutting portion in the L-pole arc-extinguishing chamber is long and strip-shaped, and its two ends are respectively facing the L-pole moving contact assembly and the L-pole extinguishing shield, and the cutting portion in the N-pole arc-extinguishing chamber is long and strip-shaped, and its two ends are respectively facing the N-pole moving contact assembly and the N-pole extinguishing shield.

[0010] In the aforementioned double arc-extinguishing multi-pole circuit breaker, the L-pole air inlet channel and the N-pole air inlet channel are provided with a protective plate on the side away from the partition.

[0011] Compared with the prior art, the utility model has the following characteristics:

[0012] (1) The utility model provides a guide rib group at the rear end of the L-pole extinguishing shield and the N-pole extinguishing shield, so that the guide rib group can separate the circuit breaker housing at the rear end of the extinguishing shield into a plurality of mutually separated guide channels after being arranged, so that the arc gas can flow toward the exhaust port along each guide channel after being discharged from different areas of the extinguishing shield, thereby effectively reducing the possibility of breakdown caused by arcs being connected in series, improving the smoothness of the arc gas after being discharged and reducing the temperature of the arc extinguishing chamber;

[0013] (2) Through the structural coordination of the guide rib group and the guide channel, on the one hand, the guide channel enclosed by the guide ribs can extend the gas flow length of the arc gas after it is discharged from the extinguishing shield, thereby extending the separation time of the arc gas in different guide channels, and further reducing the possibility of arc breakdown caused by series connection; on the other hand, in conjunction with the interception part at the end of the guide rib, it can also intercept and reduce the speed of the arc gas when it is discharged, thereby reducing the wind speed of the arc gas when it is discharged from the exhaust port, and alleviating the blockage caused by the interference of the arc gas in different guide channels when it is discharged;

[0014] (3) By arranging the direction of the gas outlet at an angle to the gas outlet direction of the exhaust port, the arc gas can collide with the side wall of the partition before being discharged from the exhaust port, which again has the effect of slowing down the arc gas, thereby shortening the fuse distance of the circuit breaker;

[0015] (4) By providing the cutting parts in the L-pole air inlet channel and the N-pole air inlet channel, the arc gas generated by the moving and static contacts when the switch is opened can be separated and guided, so that the arc gas generated during the separation of the moving contacts can enter the air inlet channels on the upper and lower sides of the cutting parts respectively, and enter different areas of the extinguishing shield along the air inlet channels, thereby improving the uniformity of the arc gas when entering the extinguishing shield and the arc extinguishing effect of the extinguishing shield on the arc; on this basis, by providing the protective plates outside the L-pole air inlet channel and the N-pole air inlet channel, the arc generated by the switch opening can be intercepted to prevent the arc from directly contacting the functional parts or the circuit breaker housing to cause breakdown, thereby ensuring the service life of the circuit breaker;

[0016] Therefore, the utility model can improve the arc extinguishing effect of the arc extinguishing hood on the arc, improve the smoothness of the arc gas when it is discharged from the arc extinguishing hood, and reduce the temperature of the arc extinguishing chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the utility model on one side of the L-pole arc extinguishing chamber;

[0018] Figure 2 It is a structural schematic diagram of the utility model on one side of the N-pole arc extinguishing chamber.

[0019] The marks in the accompanying drawings are: 1-actuator, 2-L-pole moving contact assembly, 3-N-pole moving contact assembly, 4-L-pole extinguishing shield, 5-N-pole extinguishing shield, 6-partition, 7-guide rib, 8-guide channel, 9-exhaust port, 10-intercepting part, 11-air outlet, 12-L-pole air inlet channel, 13-N-pole air inlet channel, 14-cutting part, 15-protective plate. DETAILED DESCRIPTION

[0020] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0021] Embodiment. A double arc extinguishing multi-pole circuit breaker is constructed as follows Figure 1 and 2 As shown, it includes a circuit breaker, wherein an actuator 1 is provided in the middle of the circuit breaker, and an L-pole moving contact assembly 2 and an N-pole moving contact assembly 3 are provided on both sides of the actuator 1 respectively. After the gate is opened, the actuator 1 simultaneously controls the L-pole moving contact assembly 2 and the N-pole moving contact assembly 3 to rotate and open, an L-pole arc extinguishing chamber is provided outside the L-pole moving contact assembly 2, and an L-pole arc extinguishing shield 4 is provided in the L-pole arc extinguishing chamber, and an N-pole arc extinguishing chamber is provided outside the N-pole moving contact assembly 3, and an N-pole arc extinguishing shield 5 is provided in the N-pole arc extinguishing chamber, and the L-pole arc extinguishing chamber and the N-pole arc extinguishing chamber are separated from each other by a partition 6, and both sides of the partition 6 are buckled and connected to the circuit breaker housing, and the L-pole arc extinguishing shield 4 and the N-pole arc extinguishing shield 5 are provided with a guide rib group connected to the partition 6 on the side away from the actuator 1;

[0022] The guide rib group includes a plurality of guide ribs 7 arranged at intervals, and guide channels 8 for air flow to pass through are formed on both sides of the guide ribs 7. One end of the guide channel 8 is in contact with the rear end of the L-pole extinguishing shield 4 or the N-pole extinguishing shield 5. The plurality of guide channels 8 completely cover the air outlet of the L-pole extinguishing shield 4 or the N-pole extinguishing shield 5, and the other end of the guide channel 8 faces the exhaust port 9 of the circuit breaker. The shape of the guide rib 7 can be adjusted according to the required length of the guide channel 8.

[0023] Some guide ribs 7 are provided with an intercepting portion 10 at one end close to the exhaust port 9, and the end of the intercepting portion 10 extends toward the guide channel 8 and blocks the guide channel 8. Air outlets 11 for ventilation are formed between adjacent intercepting portions 10 and between the intercepting portions 10 and the guide ribs 7, and the width of the air outlet 11 is smaller than the width of the guide channel 8.

[0024] The outlet direction of the air outlet 11 and the outlet direction of the exhaust port 9 form an angle of 90°-180°.

[0025] The L-pole arc extinguishing chamber forms an L-pole air inlet channel 12 at the interval between the L-pole moving contact assembly 2 and the L-pole extinguishing shield 4, and the N-pole arc extinguishing chamber forms an N-pole air inlet channel 13 at the interval between the N-pole moving contact assembly 3 and the N-pole extinguishing shield 5. Cutting portions 14 connecting the partition 6 are respectively provided in the L-pole air inlet channel 12 and the N-pole air inlet channel 13. The cutting portion 14 in the L-pole arc extinguishing chamber is long and has two ends facing the L-pole moving contact assembly 2 and the L-pole extinguishing shield 4 respectively. The cutting portion 14 in the N-pole arc extinguishing chamber is long and has two ends facing the N-pole moving contact assembly 3 and the N-pole extinguishing shield 5 respectively.

[0026] The L-pole air inlet channel 12 and the N-pole air inlet channel 13 are provided with a protective plate 15 on the side away from the partition plate 6. Figure 2The circuit breaker in the protective plate 15 is hidden.

[0027] The working principle of the utility model is as follows: when the circuit breaker is opened, the L-pole moving contact assembly 2 and the N-pole moving contact assembly 3 open outward and generate arc gas, wherein the arc gas in the L-pole arc extinguishing chamber flows along the L-pole air inlet channel 12 toward the L-pole extinguishing shield 4 after being generated, and during the flow process, the arc gas is separated by the cutting portion 14 to form an upper and lower part of the arc gas, which respectively flow into different areas of the L-pole extinguishing shield 4, thereby improving the arc extinguishing effect of the L-pole extinguishing shield 4 on the arc.

[0028] After passing through the L-pole extinguishing shield 4, the arc gas enters different guide channels 8 respectively, and flows along the guide channels 8 toward the gas outlet 11; when passing through the gas outlet 11, the arc gas is buffered and decelerated by the interception portion 10, thereby reducing the gas volume and impact force of the arc gas when it is discharged from the gas outlet 11. After being discharged from the guide channel 8, the arc gas continues to flow along the side wall of the partition 6 toward the exhaust port 9, and the arc gas is buffered and decelerated for the second time by the side wall of the partition 6, thereby further reducing the impact force of the arc gas when it is discharged from the exhaust port 9.

[0029] Similarly, after the arc gas in the N-pole arc extinguishing chamber is generated, it is discharged outward through the N-pole air inlet channel 13, the N-pole extinguishing shield 5, the guide channel 8 and the exhaust port 9 in the same way, and during the flow process, the arc gas is separated and guided by the cooperation of the cutting part 14 and the guide rib group, thereby reducing the possibility of breakdown caused by the arc gas.

Claims

1. A double arc extinguishing multi-pole circuit breaker, characterized in that: The circuit breaker comprises an actuator (1) in the middle part, an L-pole moving contact assembly (2) and an N-pole moving contact assembly (3) are respectively arranged on both sides of the actuator (1), an L-pole arc extinguishing chamber is arranged outside the L-pole moving contact assembly (2), an L-pole arc extinguishing shield (4) is arranged inside the L-pole arc extinguishing chamber, an N-pole arc extinguishing chamber is arranged outside the N-pole moving contact assembly (3), an N-pole arc extinguishing shield (5) is arranged inside the N-pole arc extinguishing chamber, the L-pole arc extinguishing chamber and the N-pole arc extinguishing chamber are separated from each other by a partition (6), and the L-pole arc extinguishing shield (4) and the N-pole arc extinguishing shield (5) are arranged inside the N-pole arc extinguishing chamber. The shield (5) is provided with a guide rib group connected to a partition (6) on the side away from the actuator (1); the guide rib group includes a plurality of guide ribs (7) arranged at intervals, and guide channels (8) for air flow to pass through are formed on both sides of the guide ribs (7), one end of the guide channel (8) faces the L-pole extinguishing shield (4) or the N-pole extinguishing shield (5), the plurality of guide channels (8) completely cover the air outlet of the L-pole extinguishing shield (4) or the N-pole extinguishing shield (5), and the other end of the guide channel (8) faces the exhaust port (9) of the circuit breaker.

2. A double arc extinguishing multi-pole circuit breaker according to claim 1, characterized in that: Some of the guide ribs (7) are provided with an intercepting portion (10) at one end close to the exhaust port (9); the end of the intercepting portion (10) extends in the direction of the guide channel (8) and blocks the guide channel (8); an air outlet (11) for ventilation is formed between adjacent intercepting portions (10) and between the intercepting portion (10) and the guide rib (7); the width of the air outlet (11) is smaller than the width of the guide channel (8).

3. A double arc extinguishing multi-pole circuit breaker according to claim 2, characterized in that: An angle is formed between the orientation of the air outlet (11) and the air outlet direction of the air outlet (9).

4. A double arc extinguishing multi-pole circuit breaker according to claim 1, characterized in that: The L-pole arc extinguishing chamber forms an L-pole air inlet channel (12) at the interval between the L-pole moving contact assembly (2) and the L-pole extinguishing shield (4), and the N-pole arc extinguishing chamber forms an N-pole air inlet channel (13) at the interval between the N-pole moving contact assembly (3) and the N-pole extinguishing shield (5). The L-pole air inlet channel (12) and the N-pole air inlet channel (13) are respectively provided with a cutting portion (14) connected to the partition plate (6). The cutting portion (14) in the L-pole arc extinguishing chamber is in an elongated strip shape with two ends facing the L-pole moving contact assembly (2) and the L-pole extinguishing shield (4), and the cutting portion (14) in the N-pole arc extinguishing chamber is in an elongated strip shape with two ends facing the N-pole moving contact assembly (3) and the N-pole extinguishing shield (5).

5. A double arc extinguishing multi-pole circuit breaker according to claim 4, characterized in that: The L-pole air inlet channel (12) and the N-pole air inlet channel (13) are provided with a protective plate (15) on the side away from the partition plate (6).

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