Arc quenching system, circuit breaker and plug-in circuit breaker

Abstract

An arc extinguishing system, a circuit breaker and a plug-in circuit breaker, the arc extinguishing system comprising an arc extinguishing chamber provided with a plurality of arc extinguishing vanes, one end of the arc extinguishing chamber being an air inlet and the other end being an air outlet, one end of the arc extinguishing vanes corresponding to the air inlet being provided with an arc extinguishing gap, the arc extinguishing chamber comprising at least two kinds of arc extinguishing vanes with different lengths, the at least two kinds of arc extinguishing vanes being flush arranged at one end close to the air inlet, the arc extinguishing vanes being staggered arranged at one end close to the air outlet, the arc extinguishing system not only having strong arc extinguishing capability, but also being capable of avoiding arc reignition; the circuit breaker and the plug-in circuit breaker comprising the arc extinguishing system, being capable of quickly extinguishing and discharging arc.

Description

Technical Field

[0001] This invention relates to the field of low-voltage electrical appliances, and in particular to an arc extinguishing system, a circuit breaker, and a plug-in circuit breaker. Background Technology

[0002] The arc-extinguishing system of a circuit breaker typically consists of a contact system, an arc-ignition system, an arc-extinguishing chamber, and a buffer chamber, used to extinguish the electric arc generated by the circuit breaker. Existing 5G circuit breakers (plug-in circuit breakers) differ from conventional miniature circuit breakers; they are not only smaller in size but also elongated in shape. The arc-extinguishing system is often located below the moving contact, leaving insufficient space and hindering its ability to extinguish the arc. For example, in existing arc-extinguishing systems, although the speed at which the arc penetrates the front end of the arc-extinguishing chamber is roughly the same, the arc is prone to short-circuiting and reigniting at the rear end of the chamber, easily leading to circuit breaker damage. Furthermore, the buffer chamber design of existing arc-extinguishing systems causes interference between arc gases, resulting in a slower rate of arc gas discharge, which is detrimental to improving the circuit breaker's breaking capacity. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide an arc extinguishing system with strong arc extinguishing ability and low arc re-ignition.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] An arc extinguishing system includes an arc extinguishing chamber with multiple arc extinguishing grids. One end of the arc extinguishing chamber is an air inlet, and the other end is an air outlet. The arc extinguishing grids have arc extinguishing notches at the ends corresponding to the air inlet. The arc extinguishing chamber includes at least two types of arc extinguishing grids of different lengths. The at least two types of arc extinguishing grids are flush with each other at the ends near the air inlet, and the arc extinguishing grids are offset at the ends near the air outlet.

[0006] Preferably, the multiple arc-extinguishing grids located at the top of the arc-extinguishing chamber constitute a first grid assembly, and the multiple arc-extinguishing grids located at the bottom of the arc-extinguishing chamber constitute a second grid assembly. The length of the multiple arc-extinguishing grids in the first grid assembly is greater than the length of the multiple arc-extinguishing grids in the second grid assembly.

[0007] Preferably, it also includes a buffer chamber that cooperates with the air outlet. The buffer chamber has a partition in the middle and an exhaust channel is formed on both sides of the partition. One end of the two exhaust channels is respectively engaged with the first grid assembly and the second grid assembly, and the other end of the two exhaust channels is respectively connected to the exhaust port.

[0008] Preferably, one end of the air outlet is provided with a grille, and the grille has multiple through holes in the middle. The grille corresponds to multiple arc-extinguishing grilles in the middle of the first grille assembly, forming clearance openings at the top and bottom of the first grille assembly.

[0009] Preferably, the air inlet cooperates with the contact system, and magnetic conductive structures are provided on both sides of the contact system. The magnetic conductive structure includes a magnetic conductive plate and an arc-blocking sleeve wrapped around the magnetic conductive plate.

[0010] Preferably, it also includes an arc-initiating plate, one end of the magnetic plate extends out of the arc-isolating sleeve, the arc-isolating sleeve wraps around the other end of the magnetic plate, and both sides of the arc-initiating plate are electrically connected to one end of each magnetic plate extending out of its respective arc-isolating sleeve.

[0011] Preferably, the two exhaust channels are an upper channel and a lower channel, and the end of the partition away from the arc-extinguishing chamber is bent towards the upper channel, so that the cross-sectional area of ​​the end of the upper channel away from the arc-extinguishing chamber is smaller than the cross-sectional area of ​​the end closer to the arc-extinguishing chamber, and the cross-sectional area of ​​the end of the lower channel away from the arc-extinguishing chamber is larger than the cross-sectional area of ​​the end closer to the arc-extinguishing chamber.

[0012] Preferably, among the multiple arc-extinguishing grids, at least two adjacent arc-extinguishing grids have arc-extinguishing notches flush with each other at the end near the air inlet, and the arc-extinguishing notches of the two adjacent arc-extinguishing grids are offset to the sides at the end near the air outlet.

[0013] Preferably, the arc-extinguishing notch includes an extended inclined side and a shortened inclined side, the extended inclined side and the shortened inclined side are spaced apart at their ends near the air inlet, the extended inclined side and the shortened inclined side are connected at their ends near the air outlet, and the length of the extended inclined side is greater than that of the shortened inclined side; the included angle α between the projections of the extended inclined sides of two adjacent arc-extinguishing grids in the direction perpendicular to the arc-extinguishing grid is 50°–80°.

[0014] The arc extinguishing system of the present invention includes an arc extinguishing chamber comprising at least two types of arc extinguishing grids of different lengths. By staggering the at least two types of arc extinguishing grids in the length direction at one end near the outlet, not only can the size of the arc extinguishing grids be increased and the ability to extinguish the electric arc be improved, but also the reignition of the electric arc at the outlet can be prevented.

[0015] In addition, the buffer chamber is provided with two exhaust channels that cooperate with the first grid assembly at the top and the second grid assembly at the bottom of the exhaust port, respectively. This allows the arc gas to be discharged more evenly, draws the arc into the arc extinguishing chamber more quickly, increases the speed of arc extinguishing, and also prevents the arc from reigniting at the exhaust port.

[0016] In addition, the magnetically conductive structure can enhance the magnetic field strength in the arc-initiating area of ​​the contact, enabling the arc to jump quickly from the moving contact to the arc-initiating channel, and guiding the arc pulled out by the moving contact to the arc-extinguishing chamber more quickly, thus protecting the moving contact from burnout.

[0017] The present invention also provides a circuit breaker including the aforementioned arc extinguishing system.

[0018] The present invention also provides a plug-in circuit breaker, which includes a housing, an operating mechanism, a contact system, a button, a first terminal and a second terminal respectively disposed within the housing, and the arc extinguishing system, wherein the first terminal and the button are disposed at one end of the housing, and the second terminal is disposed at the other end of the housing.

[0019] The circuit breaker and plug-in circuit breaker of the present invention can quickly extinguish the electric arc through the arc extinguishing system and promptly discharge the arc gas from the plug-in circuit breaker. This not only prevents the electric arc from damaging the internal parts of the plug-in circuit breaker, but also enables the plug-in circuit breaker to operate in high-current lines. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the internal structure of the plug-in circuit breaker of the present invention;

[0021] Figure 2 This is the present invention. Figure 1 Another structural diagram;

[0022] Figure 3 This is a schematic diagram of the magnetic guiding mechanism of the present invention;

[0023] Figure 4 This is an exploded view of the magnetic guiding mechanism of the present invention;

[0024] Figure 5 This is a schematic diagram showing the magnetic guiding mechanism and the arc-inducing plate of the present invention respectively cooperating with the contact system;

[0025] Figure 6 This is the present invention. Figure 5 A magnified view of a portion of the image;

[0026] Figure 7 This is a schematic diagram of the arc-extinguishing chamber of the present invention;

[0027] Figure 8 This is a top view of the arc-extinguishing chamber of the present invention;

[0028] Figure 9 This is a side view of the arc-extinguishing chamber of the present invention;

[0029] Figure 10 This is a partial structural diagram of the internal structure of the plug-in circuit breaker of the present invention. Detailed Implementation

[0030] The following is in conjunction with the appendix Figures 1 to 10 The given embodiments further illustrate specific implementations of the arc-extinguishing system of the present invention. The arc-extinguishing system of the present invention is not limited to the descriptions of the following embodiments.

[0031] like Figure 1As shown in Figure 2, the circuit breaker in this embodiment is a plug-in circuit breaker. The plug-in circuit breaker includes a housing 60, and an operating mechanism, a contact system, a protection mechanism, a button 61, a first terminal and a second terminal 63 respectively disposed within the housing 60, as well as the arc extinguishing system. The first terminal and the button 61 are disposed at one end of the housing 60, and the second terminal 63 is disposed at the other end of the housing 60. The button 61 is connected to the operating mechanism. The contact system includes a moving contact 64 and a stationary contact 65. The moving contact 64 is mounted on the operating mechanism. The button 61 can drive the moving contact 64 to contact and separate from the stationary contact 65 through the operating mechanism. When the moving contact 64 contacts the stationary contact 65, the circuit is connected. When the moving contact 64 separates from the stationary contact 65, the circuit is disconnected, and an arc is drawn out at the same time as the separation.

[0032] One improvement of the plug-in circuit breaker in this embodiment lies in its arc-extinguishing system. This system can quickly extinguish the electric arc and promptly remove arc gas from the plug-in circuit breaker. This not only prevents the arc from damaging the internal components of the plug-in circuit breaker but also enables it to operate in high-current circuits. It should be noted that the arc-extinguishing system of this invention is not only applicable to plug-in circuit breakers but can also be used with other types of circuit breakers.

[0033] like Figure 7 As shown in Figure 9, the arc-extinguishing system of the present invention includes an arc-extinguishing chamber 10 with multiple arc-extinguishing grids 4. One end of the arc-extinguishing chamber 10 is an air inlet 2, and the other end is an air outlet 3. The multiple arc-extinguishing grids 4 are respectively provided with arc-extinguishing notches 5 at one end corresponding to the air inlet 2. The arc-extinguishing chamber 10 includes at least two types of arc-extinguishing grids 4 with different lengths. See Figure 9. Figure 9 The at least two types of arc-extinguishing grid plates 4 are flush with each other at one end near the air inlet 2 and staggered at the other end near the air outlet 3. The arc-extinguishing chamber 10 includes at least two types of arc-extinguishing grid plates 4 of different lengths. By staggering the at least two types of arc-extinguishing grid plates 4 in the length direction at one end near the air outlet 3, not only can the size of the arc-extinguishing grid plates 4 be increased, improving the ability to extinguish the electric arc, but also preventing the electric arc from reigniting at the air outlet.

[0034] like Figure 7 As shown in Figure 9, the arc-extinguishing chamber 10 includes two opposing cheek plates 1 and a plurality of grid plates connected between the two cheek plates 1. An air inlet 2 is formed between one end of the two cheek plates 1, and an air outlet 3 is formed between the other ends of the two cheek plates 1. See also Figure 9In a preferred embodiment, the arc-extinguishing chamber 10 includes two types of arc-extinguishing grids of different lengths. Multiple arc-extinguishing grids 4 located at the top of the arc-extinguishing chamber 10 constitute a first grid assembly 43, and multiple arc-extinguishing grids 4 located at the bottom of the arc-extinguishing chamber 10 constitute a second grid assembly 44. The length of the multiple arc-extinguishing grids 4 in the first grid assembly 43 is greater than the length of the multiple arc-extinguishing grids 4 in the second grid assembly 44, thus dividing the arc-extinguishing chamber 10 into a first part at the top and a second part at the bottom. The length of the first part of the arc-extinguishing chamber 10 is greater than the length of the second part. Since more of the high-temperature gas generated by the electric arc will be discharged upwards, the size of the arc-extinguishing grids 4 at the top of the arc-extinguishing chamber 10 can be increased without increasing the size of the outer casing 60, thereby improving the ability to extinguish the electric arc and preventing reignition of the arc at the outlet.

[0035] Further, see Figure 7 Multiple arc-extinguishing grid plates 4 are provided with arc-extinguishing notches 5 at one end corresponding to the air inlet 2. Among the multiple arc-extinguishing grid plates 4, at least two adjacent arc-extinguishing grid plates 4 have arc-extinguishing notches 5 that are flush with each other at the end near the air inlet 2, and are staggered to both sides at the end near the air outlet 3. The arc-extinguishing chamber of the present invention, by staggering the arc-extinguishing notches 5 on the ends of two adjacent arc-extinguishing grid plates 4 near the air outlet 3, can not only improve the ability to cut off and extinguish electric arcs, but also change the channel of electric arc airflow transfer, and accelerate the discharge and attraction of electric arcs.

[0036] Preferably, in this embodiment, the bottoms of the arc-extinguishing notches 5 of all adjacent arc-extinguishing grid plates 4 within the arc-extinguishing chamber 4 are staggered, including the arc-extinguishing grid plates 4 of the first grid plate assembly 43 and the second grid plate assembly 44. The depths of the arc-extinguishing notches 5 of the arc-extinguishing grid plates 4 of the first grid plate assembly 43 and the second grid plate assembly 44 are consistent, and the bottoms of the arc-extinguishing notches 5 of adjacent arc-extinguishing grid plates 4 are staggered to both sides on the plane of the arc-extinguishing grid plate 4. Of course, as another embodiment, only the bottoms of the arc-extinguishing notches 5 of some adjacent arc-extinguishing grid plates 4 may be staggered.

[0037] See Figure 8Based on the classification of the arc-extinguishing notch 5, the plurality of grid plates include at least two types of arc-extinguishing grid plates 4 arranged alternately in sequence. The at least two types of arc-extinguishing grid plates 4 are respectively provided with an arc-extinguishing notch 5 at one end corresponding to the air inlet 2. The bottom of the arc-extinguishing notch 5 on the at least two types of arc-extinguishing grid plates 4 is staggered. In this embodiment, the plurality of grid plates are composed of two types of arc-extinguishing grid plates 4 arranged alternately. The bottom of the arc-extinguishing notch 5 on the two types of arc-extinguishing grid plates 4 is staggered. The two types of arc-extinguishing grid plates 4 are a first grid plate 41 and a second grid plate 42. The arc-extinguishing notches 5 on the plurality of first grid plates 41 are the same, and the arc-extinguishing notches 5 on the plurality of second grid plates 42 are also the same. However, the arc-extinguishing notches 5 on the first grid plates 41 and the second grid plates 42 are different. The ends of the arc-extinguishing notches 5 on the first grid plates 41 and the second grid plates 42 that are close to the air inlet 2 are flush. The ends of the arc-extinguishing notches 5 on the first grid plates 41 and the second grid plates 42 that are close to the air outlet 3 are respectively staggered to the two sides where the two cheek plates 1 are provided.

[0038] Specifically, the arc-extinguishing notch 5 is roughly triangular in shape. The arc-extinguishing notch 5 includes an extended hypotenuse 51 and a shortened hypotenuse 52. The length of the extended hypotenuse 51 is greater than that of the shortened hypotenuse 52. The ends of the extended hypotenuse 51 and the shortened hypotenuse 52 that are close to the air outlet 3 are connected and form the end of the arc-extinguishing notch 5 that is close to the air outlet 3. The ends of the extended hypotenuse 51 and the shortened hypotenuse 52 that are close to the air inlet 2 are spaced apart and form the end of the arc-extinguishing notch 5 that is close to the air inlet 2.

[0039] The angle α between the projections of the extended inclined side 51 on the first grid plate 41 and the extended inclined side 51 on the second grid plate 42 in the direction perpendicular to the arc-extinguishing grid plate 4 is 50°–80°. Taking α as 50°–80° can ensure that the first grid plate 41 and the second grid plate 42 are staggered at a reasonable angle, preventing the misalignment angle from being too large to make contact with the electric arc, or the misalignment angle from being too small to improve the ability to attract the electric arc.

[0040] It is understood that the multiple grid plates can also be composed of three or more types of arc-extinguishing grid plates 4. For example, a third grid plate can be added based on the first grid plate 41 and the second grid plate 42. The first grid plate 41, the second grid plate 42 and the third grid plate constitute a set of alternating arc-extinguishing grid plates 4. Multiple sets of alternating grid plates are arranged in the same direction in sequence. The arc-extinguishing gaps 5 on multiple third grid plates are the same, but the arc-extinguishing gaps 5 on the first grid plate 41, the second grid plate 42 and the third grid plate are different. All of these are within the protection scope of this invention.

[0041] The operating mechanism of the circuit breaker in this embodiment includes a first lever 71, a transmission component 72, a second lever 73, a support component, a trip latch 74, and a locking latch 75. The transmission component 72 and the support component are rotatably mounted inside the housing 60. The trip latch 74 and the locking latch 75 are rotatably mounted on the support component and are engaged. The moving contact 64 is connected to the support component. When the trip latch 74 and the locking latch 75 are engaged, the button 61 can push the first lever 71. The first lever 71 drives the transmission component 72 to rotate. The transmission component 72 drives the trip latch 74 through the second lever 73, which in turn drives the support component to rotate, thereby driving the moving contact 64. This causes the operating mechanism to move the moving contact 64, realizing the closing and opening of the circuit. When a fault occurs in the line, the protection mechanism triggers the release of the engagement between the trip latch 74 and the locking latch 75. The operating mechanism trips, causing the moving contact 64 to separate from the stationary contact 65. The operating mechanism can be implemented using various structures, and no specific limitation is made here.

[0042] like Figure 10 As shown, the arc extinguishing system of this embodiment also includes a buffer chamber 8 that cooperates with the outlet 3 of the arc extinguishing chamber 10. A partition 80 is provided in the middle of the buffer chamber 8. Exhaust channels are formed on the upper and lower sides of the partition 80. One end of each exhaust channel on both sides of the partition 80 cooperates with the outlet 3 of the arc extinguishing chamber 10, and the other end of each exhaust channel cooperates with the exhaust port on the outer casing 60. This not only allows the arc gas to be discharged more evenly, drawing the arc into the arc extinguishing chamber 10 more quickly and increasing the arc extinguishing speed, but also facilitates the cooling and extinguishing of the arc, preventing reignition of the arc at the outlet 3 of the arc extinguishing chamber 10. Furthermore, by dividing the buffer chamber 8 into two exhaust channels, each exhaust channel becomes narrower, making it easier to create an airflow pressure difference, ensuring the rapid transfer of the arc from the moving contact 64 to the arc extinguishing chamber 10, and preventing the two exhaust channels from interfering with each other.

[0043] Furthermore, one end of each of the two exhaust channels corresponds to and engages with the first grid assembly 43 and the second grid assembly 44, respectively, while the other end of each exhaust channel is connected to an exhaust port. The two exhaust channels engage with the top and bottom of the outlet 3 of the arc-extinguishing chamber 10, respectively, drawing arc gas from the top and bottom of the outlet 3. This separates the arc exhaust gas into two independent buffer chambers. The pressure difference generated by the two independent exhaust channels enhances the effective arc-cutting effect of the arc-extinguishing grid, improves the utilization rate of the arc-extinguishing chamber, and facilitates arc cooling and extinguishing.

[0044] Furthermore, the two exhaust channels are an upper channel 81 and a lower channel 82, respectively. The end of the partition 80 away from the arc-extinguishing chamber 10 is bent towards the upper channel 81, making the cross-sectional area of ​​the end of the upper channel 81 away from the arc-extinguishing chamber 10 smaller than the cross-sectional area of ​​the end closer to the arc-extinguishing chamber 10, and making the cross-sectional area of ​​the end of the lower channel 82 away from the arc-extinguishing chamber 10 larger than the cross-sectional area of ​​the end closer to the arc-extinguishing chamber 10. By changing the cross-sectional areas of the upper channel 81 and the lower channel 82, a more significant pressure difference can be generated, which is beneficial for traction arc to be discharged along the upper end of the arc-extinguishing chamber and accelerating the discharge of arc gas from the circuit breaker. Of course, the cross-sectional areas of the upper channel 81 and the lower channel 82 can also remain unchanged, which is also within the scope of protection of this invention.

[0045] like Figure 7 , 10 As shown, the outlet 3 of the arc-extinguishing chamber 10 is provided with a grid 83 connected between the two cheek plates 1, and multiple through holes 84 are provided in the middle of the grid 83. Preferably, the grid 83 has an "I" shaped structure, and the grid 83 corresponds to multiple arc-extinguishing grids 4 in the middle of the first grid assembly 43, but does not correspond to the top and bottom arc-extinguishing grids 4 in the first grid assembly 43, forming clearance openings 85 at the top and bottom of the first grid assembly 43. By providing clearance openings 85 on the other two sides where the grid 83 connects to the two cheek plates 1, that is, the top and bottom sides of the grid 83, the clearance openings 85 on the top and bottom sides of the grid 83 can attract the arc gas to the top and bottom sides of the grid 83, preventing the arc gas from concentrating at the through holes 84 in the middle of the grid 83 and being discharged. This not only further increases the speed at which the arc is attracted into the arc-extinguishing chamber 10, but also allows the arc to jump to the tail of the arc-extinguishing chamber 10 with maximum force, greatly improving the cutting and cooling effect of the arc.

[0046] Specifically, the multiple arc-extinguishing grid plates 4 located at the top of the arc-extinguishing chamber 10 constitute a first grid plate assembly 43, and the multiple arc-extinguishing grid plates 4 located at the bottom of the arc-extinguishing chamber 10 constitute a second grid plate assembly 44. The lengths of the multiple arc-extinguishing grid plates 4 in the first grid plate assembly 43 are respectively greater than the lengths of the multiple arc-extinguishing grid plates 4 in the second grid plate assembly 44. A grid 83 is provided at a position corresponding to the first grid plate assembly 43, and the two exhaust channels of the buffer chamber 8 are respectively matched with the first grid plate assembly 43 and the second grid plate assembly 44.

[0047] like Figure 2As shown in Figure 4, the arc-extinguishing system of this embodiment also includes a magnetically conductive structure disposed between the arc-initiating area of ​​the moving contact 64 and the stationary contact 65 and the air inlet 2 of the arc-extinguishing chamber 10. This magnetically conductive structure enhances the magnetic field strength in the arc-initiating area of ​​the contacts, allowing the arc to quickly jump from the moving contact 64 to the arc-initiating channel, guiding the arc pulled out by the moving contact 64 towards the arc-extinguishing chamber 10 more quickly, and protecting the moving contact 64 from burn-out. Two magnetically conductive structures are disposed opposite each other on both sides of the moving contact 64. Each magnetically conductive structure includes a magnetically conductive plate 91 and an arc-isolating sleeve 92 fitted over the magnetically conductive plate 91. The arc-isolating sleeve 92 wraps around the top of the magnetically conductive plate 91 and is mounted on the slot of the outer casing 60. The two magnetically conductive structures enhance the arc-initiating magnetic field, guiding the arc towards the arc-extinguishing chamber 10 more quickly.

[0048] like Figure 5 As shown in Figure 6, the system also includes an arc-starting plate 93 that cooperates with the magnetically conductive structure. One end of the arc-starting plate 93 is connected to the stationary contact 65 of the contact system, and the other end of the arc-starting plate 93 extends below the air inlet 2 of the arc-extinguishing chamber 10 and extends below the air outlet 3, that is, extends to the tail of the arc-extinguishing chamber 10. One end of the magnetically conductive plate 91 extends out from the arc-isolating sleeve 92, and the arc-isolating sleeve 92 wraps around the other end of the magnetically conductive plate 91. The two sides of the arc-starting plate 93 are electrically connected to the ends of the two magnetically conductive plates 91 that extend out of their respective arc-isolating sleeves 92. The arc-starting plate 93 can not only pull the arc to the air outlet 3 of the arc-extinguishing chamber 10, but also significantly lengthen the arc, making it easier to control the arc. The arc is extinguished, and the magnetic plate 91 is made of steel or other conductive material. Since the bottom of the magnetic plate 91 is not covered by the arc-blocking sleeve 92, the arc-initiating plate 93 can contact the exposed conductive part at the bottom of the magnetic plate 91. This allows the arc-initiating plate 93, the two arc-initiating plates 93, and the moving and stationary contacts of the contact system to form a conductive circuit. This further enhances the magnetic field strength in the arc-initiating area of ​​the contact, allowing the arc to transfer more quickly from the moving contact 64 to the arc-initiating channel. This further reduces the residence time of the arc on the moving contact 64, preventing excessive burn-out of the moving contact 64. This plays a crucial role in the transfer and extinguishing of the arc.

[0049] The arc extinguishing system in this embodiment consists of a contact system, an arc-initiating plate 93, a magnetic plate 91, an arc-isolating sleeve 92, an arc-extinguishing chamber 10, and a buffer chamber 8. The magnetic structure, buffer chamber, and arc-extinguishing chamber work together to extinguish the arc quickly. It is mainly used in 5G circuit breakers to achieve rapid arc initiation and extinguishing, which greatly improves the breaking capacity of the circuit breaker.

[0050] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. An arc-extinguishing system comprising an arc-extinguishing chamber (10) having a plurality of arc-extinguishing grids (4), one end of the arc-extinguishing chamber (10) being an air inlet (2) and the other end being an air outlet (3), the arc-extinguishing grids (4) having an arc-extinguishing notch (5) at one end corresponding to the air inlet (2), the arc-extinguishing chamber (10) comprising at least two types of arc-extinguishing grids (4) of different lengths, characterized in that: The at least two types of arc-extinguishing grid plates (4) are flush with each other at one end near the air inlet (2), and the arc-extinguishing grid plates (4) are offset at one end near the air outlet (3); Multiple arc-extinguishing grid plates (4) located at the top of the arc-extinguishing chamber (10) constitute a first grid plate assembly (43), and multiple arc-extinguishing grid plates (4) located at the bottom of the arc-extinguishing chamber (10) constitute a second grid plate assembly (44). The length of the multiple arc-extinguishing grid plates (4) of the first grid plate assembly (43) is greater than the length of the multiple arc-extinguishing grid plates (4) of the second grid plate assembly (44). It also includes a buffer chamber (8) that cooperates with the air outlet (3). The buffer chamber (8) has a partition (80) in the middle. The buffer chamber (8) forms exhaust channels on both sides of the partition (80). One end of the two exhaust channels is respectively connected to the first grid assembly (43) and the second grid assembly (44), and the other end of the two exhaust channels is connected to the exhaust outlet. The two exhaust channels are an upper channel (81) and a lower channel (82). The end of the partition (80) away from the arc-extinguishing chamber (10) bends towards the upper channel (81), so that the cross-sectional area of ​​the end of the upper channel (81) away from the arc-extinguishing chamber (10) is smaller than the cross-sectional area of ​​the end closer to the arc-extinguishing chamber (10), and the cross-sectional area of ​​the end of the lower channel (82) away from the arc-extinguishing chamber (10) is larger than the cross-sectional area of ​​the end closer to the arc-extinguishing chamber (10).

2. The quenching system of claim 1, wherein: The arc-extinguishing chamber (10) includes two cheek plates (1) arranged opposite to each other, and a plurality of arc-extinguishing grids (4) connected between the two cheek plates (1), forming an air inlet (2) between one end of the two cheek plates (1) and an air outlet (3) between the other end of the two cheek plates (1).

3. The quenching system of claim 1, wherein: The air outlet (3) is provided with a grille (83) at one end, and a plurality of through holes (84) are provided in the middle of the grille (83). The grille (83) corresponds to a plurality of arc-extinguishing grilles (4) in the middle of the first grille assembly (43), and clearance openings (85) are formed at the top and bottom of the first grille assembly (43).

4. The quenching system of claim 1, wherein: The air inlet (2) cooperates with the contact system, and magnetic conductive structures are provided on both sides of the contact system. The magnetic conductive structures include a magnetic conductive plate (91) and an arc-blocking sleeve (92) wrapped around the magnetic conductive plate (91).

5. The quenching system of claim 4, wherein: It also includes an arc-starting plate (93), one end of a magnetic plate (91) extends out from an arc-isolating sleeve (92), the arc-isolating sleeve (92) wraps around the other end of the magnetic plate (91), and the two sides of the arc-starting plate (93) are electrically connected to the ends of the two magnetic plates (91) extending out of their respective arc-isolating sleeves (92).

6. The quenching system of claim 1, wherein: Among the multiple arc-extinguishing grid plates (4), at least two adjacent arc-extinguishing grid plates (4) have arc-extinguishing notches (5) flush with each other at the end near the air inlet (2), and the arc-extinguishing notches (5) of the two adjacent arc-extinguishing grid plates (4) are offset to the sides at the end near the air outlet (3).

7. The quenching system of claim 6, wherein: The arc-extinguishing notch (5) includes an extended inclined side (51) and a shortened inclined side (52). The extended inclined side (51) and the shortened inclined side (52) are spaced apart at one end near the air inlet (2), and the extended inclined side (51) and the shortened inclined side (52) are connected at one end near the air outlet (3). The length of the extended inclined side (51) is greater than that of the shortened inclined side (52). The included angle α between the projections of the extended inclined sides (51) of two adjacent arc-extinguishing grid plates (4) in the direction perpendicular to the arc-extinguishing grid plate (4) is 50°–80°.

8. A circuit breaker characterized by: Including the arc extinguishing system as described in any one of claims 1-7.

9. A plug-in circuit breaker, characterized by: It includes a housing (60), and an operating mechanism, a contact system, a button (61), a first terminal and a second terminal (63) respectively disposed in the housing (60), and an arc extinguishing system as described in any one of claims 1-8, wherein the first terminal and the button (61) are disposed at one end of the housing (60), and the second terminal (63) is disposed at the other end of the housing (60).

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