Arc extinguishing chamber and circuit breaker

Abstract

The present invention provides an arc extinguishing chamber and a circuit breaker, including a base, a middle seat disposed on the base, and a cover body covering the base and the middle seat. The arc extinguishing plates are arranged perpendicular to the base, and there is an arc extinguishing gap between adjacent arc extinguishing plates. The middle seat is provided with a set of arc blocking ribs at one end away from the magnetic support for blocking the arc extinguishing gap. The upper arc blocking rib and the lower arc blocking rib respectively block the upper and lower parts of two adjacent arc extinguishing gaps. The electric arc can form an arc extinguishing channel through the arc extinguishing gap, and the tail end of the arc extinguishing plate is not completely blocked. The upper and lower arc blocking ribs that are staggered with each other respectively block the tail end of the arc extinguishing plate, that is, only the upper part or the lower part of the arc extinguishing gap is blocked, which can guide the arc extinguishing airflow to form a connected ventilation channel, thereby accelerating the gas flow, making it easy for the electric arc to move from the magnetic support into the arc extinguishing chamber and move towards the tail of the arc extinguishing chamber, and reducing the arc extinguishing time.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breaker structures, and particularly relates to an arc extinguishing chamber and a circuit breaker. Background Art

[0002] For the circuit breakers in the prior art, an arc extinguishing chamber is generally required for arc extinguishing. Among them, the arc extinguishing chamber generally adopts a traditional metal grid plate arc extinguishing chamber, and the arc extinguishing plates and the periphery on the upper part of the arc extinguishing chamber adopt melamine laminate. When an arc is generated, the melamine laminate releases a gas when heated, and this gas helps to extinguish the arc. A number of holes of equal size are punched out of the laminate of the arc extinguishing plate on the upper part of the arc extinguishing chamber, and air flow and heat are released through these holes, so as to achieve the purpose of arc extinguishing.

[0003] However, the arc extinguishing channels in the existing arc extinguishing chambers are generally located at the tail of the arc extinguishing chamber. At this time, regardless of the size of the buffer space outside the arc extinguishing chamber, it is generally only shielded by the ribs protruding on the outer shell and the clamping plates on the outer edge of the arc extinguishing chamber, and the distances between the ribs protruding on the outer shell, the clamping plates on the outer edge of the arc extinguishing chamber and the arc extinguishing plates are unequal, resulting in uneven distribution of the buffer space and the problem that the air flow channels in some areas of the buffer are not smooth. If the tail of the arc extinguishing chamber is completely shielded, it will cause the arc to be difficult to enter the arc extinguishing chamber, the utilization efficiency of the arc extinguishing chamber is low, and the arc entering the arc extinguishing chamber can also have the phenomenon of back breakdown, thereby reducing the breaking performance of the circuit breaker. Summary of the Invention

[0004] The purpose of the present invention is to provide an arc extinguishing chamber to solve the technical problems existing in the prior art.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is: to provide an arc extinguishing chamber, including a base, a middle seat arranged on the base, and a cover body covering the base and the middle seat. An accommodation cavity for accommodating a plurality of arc extinguishing plates is formed in the middle seat. The arc extinguishing plates are arranged perpendicular to the base, and there is an arc extinguishing gap between adjacent arc extinguishing plates. The magnetic bracket can extend to the arc extinguishing plates. The middle seat is provided with an arc blocking rib group for blocking the arc extinguishing gap at one end far from the magnetic bracket. The arc blocking rib group includes an upper arc blocking rib and a lower arc blocking rib which are arranged in an intersecting manner. The upper arc blocking rib and the lower arc blocking rib respectively block the upper part and the lower part of two adjacent arc extinguishing gaps.

[0006] Further, a partition plate is horizontally arranged on the middle seat. The partition plate is arranged parallel to the base, and an upper buffer wall protrudes from the outer edge of the partition plate towards the cover body. An upper buffer area is formed by enclosing between the partition plate, the cover body and the upper buffer wall. The upper part of the arc extinguishing gap can be communicated with the upper buffer area;

[0007] The outer edge of the partition plate protrudes with a lower buffer wall toward one side of the base. A lower buffer area is formed between the partition plate, the base, and the lower buffer wall, and the lower part of the arc extinguishing gap can communicate with the lower buffer area.

[0008] The lower arc blocking rib on the side close to the magnetic bracket has a notch, and the lower part of the arc extinguishing gap on the side close to the magnetic bracket is not blocked.

[0009] Further, a first air outlet is provided on the side of the upper buffer area away from the magnetic bracket, and a second air outlet is provided on the side of the lower buffer area away from the magnetic bracket.

[0010] Further, the upper arc blocking rib protrudes on the side of the partition plate away from the base. The upper arc blocking rib includes a plurality of upper blocking blocks arranged at intervals, and each upper blocking block corresponds to the upper part of an arc extinguishing gap; the lower arc blocking rib protrudes on the side of the partition plate close to the base. The lower arc blocking rib includes a plurality of lower blocking blocks arranged at intervals, and each lower blocking block corresponds to the lower part of an arc extinguishing gap; the upper blocking blocks and the lower blocking blocks are arranged alternately.

[0011] Further, a corner plate is provided on one side of the upper blocking block at the end away from the magnetic bracket, and the corner plate blocks the arc extinguishing gap at the end farthest from the magnetic bracket.

[0012] Further, there is an air outlet channel between the arc extinguishing plate at the side closest to the magnetic bracket and the edge of the middle seat. A third air outlet connecting the air outlet channel and the upper buffer area and a fourth air outlet connecting the air outlet channel and the lower buffer area are provided on the middle seat.

[0013] Further, the cross-sectional area of the third air outlet is larger than the cross-sectional area of the fourth air outlet.

[0014] Further, an extension wall enclosing the outer edge of the air outlet channel extends on the side of the upper buffer wall facing the air outlet channel.

[0015] Further, a fifth air outlet is also provided on the side of the fixing column for fixing the magnetic bracket on the middle seat.

[0016] The present invention also provides a circuit breaker, including a magnetic bracket and the arc extinguishing chamber as described above. The magnetic bracket can extend to the arc extinguishing chamber, and a static contact is provided on the magnetic bracket.

[0017] The beneficial effects of the arc extinguishing chamber and the circuit breaker provided by the present invention are as follows: Compared with the prior art, in the arc extinguishing chamber and the circuit breaker of the present invention, the middle seat is arranged in the base, and the arc extinguishing plates are arranged in the accommodating cavity of the middle seat. Thus, the position of the arc extinguishing plates is limited by the outer edge of the middle seat. The arc can form an arc extinguishing channel through the arc extinguishing gap, and the tail end of the arc extinguishing plate is not completely blocked. The upper arc blocking ribs and the lower arc blocking ribs that intersect with each other respectively block the tail end of the arc extinguishing plate, that is, only the upper part or the lower part of the arc extinguishing gap is blocked, which can guide the arc extinguishing airflow to form a connected ventilation channel, connect the gap between the arc extinguishing plates and the outside, thereby accelerating the gas flow, making it easy for the arc to move from the magnetic bracket to the inside of the arc extinguishing chamber and move towards the tail of the arc extinguishing chamber, and reducing the arc extinguishing time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a front view structural schematic diagram of the arc extinguishing chamber provided by an embodiment of the present invention, where the cover body is not shown;

[0020] Figure 2 It is a top view structural schematic diagram of the arc extinguishing chamber provided by an embodiment of the present invention, where the cover body is not shown;

[0021] Figure 3 It is a sectional view along Figure 2 line A - A in

[0022] Figure 4 It is a sectional view along Figure 2 line B - B in

[0023] Figure 5 It is a three - dimensional structural schematic Figure 1 of the arc extinguishing chamber provided by an embodiment of the present invention, where the cover body is not shown;

[0024] Figure 6 It is a three - dimensional structural schematic Figure 2 of the arc extinguishing chamber provided by an embodiment of the present invention, where the cover body is not shown;

[0025] Figure 7 It is Figure 6 a partial enlarged structural schematic diagram of part C in

[0026] Figure 8 It is a rear view structural schematic diagram of the arc extinguishing chamber provided by an embodiment of the present invention, where the base is not shown.

[0027] Description of the reference numerals:

[0028] 1. Base; 2. Middle seat; 3. Cover body; 4. Arc extinguishing piece; 5. Magnetic support; 21. Accommodating cavity; 22. Arc blocking rib group; 23. Partition board; 24. Upper buffer zone; 25. Lower buffer zone; 26. Air outlet channel; 27. Third air outlet; 28. Fourth air outlet; 29. Fifth air outlet; 221. Upper arc blocking rib; 222. Lower arc blocking rib; 231. Upper buffer wall; 232. Lower buffer wall; 233. First air outlet; 234. Second air outlet; 235. Extension wall; 31. Corner plate; 41. Arc extinguishing gap; 51. Static contact. Detailed implementation manners

[0029] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0030] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0032] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0033] Please refer to Figures 1 to 4, the arc extinguishing chamber provided by the present invention will be described hereinafter. The arc extinguishing chamber includes a base 1, a middle seat 2 disposed on the base 1, and a cover body 3 covering the base 1 and the middle seat 2. An accommodation cavity 21 for accommodating a plurality of arc extinguishing sheets 4 is formed in the middle seat 2. The arc extinguishing sheets 4 are arranged perpendicular to the base 1, and an arc extinguishing gap 41 is provided between adjacent arc extinguishing sheets 4. A magnetic support 5 can extend to the arc extinguishing sheets 4. The middle seat 2 is provided with an arc blocking rib group 22 for blocking the arc extinguishing gap 41 at one end away from the magnetic support 5. The arc blocking rib group 22 includes an upper arc blocking rib 221 and a lower arc blocking rib 222 which are arranged in an intersecting manner. The upper arc blocking rib 221 and the lower arc blocking rib 222 respectively block the upper and lower parts of two adjacent arc extinguishing gaps 41.

[0034] Compared with the prior art, in the arc extinguishing chamber provided by the present invention, the middle seat 2 is framed in the base 1, and the arc extinguishing sheets 4 are arranged in the accommodation cavity 21 of the middle seat 2. Thus, the position of the arc extinguishing sheets 4 is defined by the outer edge of the middle seat 2. An arc extinguishing channel can be formed through the arc extinguishing gap 41 for the arc. Moreover, the tail end of the arc extinguishing sheet 4 is not completely blocked. The upper arc blocking rib 221 and the lower arc blocking rib 222 which are arranged in an intersecting manner respectively block the tail end of the arc extinguishing sheet 4, that is, only the upper part or the lower part of the arc extinguishing gap 41 is blocked. An air vent channel can be formed by guiding the arc extinguishing gas flow, so that the gap between the arc extinguishing sheets 4 is communicated with the outside, thereby accelerating the gas flow, making it easier for the arc to move from the magnetic support 5 into the arc extinguishing chamber and move towards the tail of the arc extinguishing chamber, and reducing the arc extinguishing time.

[0035] Specifically, the base 1 and the cover body 3 are standard components of a circuit breaker. An operating mechanism (not shown in the figure), a static contact 51, an electromagnetic coil, etc. are also provided between the base 1 and the cover body 3. The magnetic support 5 is an arc guiding plate and can guide the arc between the arc extinguishing sheets 4. The static contact 51 is fixed on one side of the arc guiding plate and can contact a moving contact (not shown in the figure). The middle seat 2 is arranged on the base 1, and a through hole is formed in the middle part of the middle seat 2. The outer wall of the through hole, the base 1 and the cover body 3 jointly enclose an accommodation cavity 21. The arc extinguishing sheets 4 are vertically placed in the accommodation cavity 21, and the number of the arc extinguishing sheets 4 is multiple. They are evenly spaced in sequence, which means that an arc extinguishing gap 41 can be formed between adjacent arc extinguishing sheets 4 in the accommodation cavity 21, and the arc extinguishing gas can enter the buffer area at the outer edge of the middle seat 2 through the arc extinguishing gap 41. Among them, in order to enable the arc extinguishing sheets 4 to be stably arranged perpendicular to the base 1, a connecting piece is arranged at one end of the arc extinguishing sheet 4 away from the base 1. The connecting piece can connect two adjacent arc extinguishing sheets 4, fix the distance between the arc extinguishing sheets 4, and also define the position of the arc extinguishing sheets 4.

[0036] Further, please refer to Figures 1 to 5, as a specific embodiment of the arc extinguishing chamber provided by the present invention, a partition plate 23 is horizontally arranged on the middle seat 2. The partition plate 23 is parallel to the base 1, and an upper buffer wall 231 protrudes towards the cover body 3 from the outer edge of the partition plate 23. An upper buffer area 24 is formed by enclosing between the partition plate 23, the cover body 3 and the upper buffer wall 231, and the upper part of the arc extinguishing gap 41 can be communicated with the upper buffer area 24; a lower buffer wall 232 protrudes from the outer edge of the partition plate 23 towards the side of the base 1. A lower buffer area 25 is formed between the partition plate 23, the base 1 and the lower buffer wall 232, and the lower part of the arc extinguishing gap 41 can be communicated with the lower buffer area 25; the lower arc shielding rib 222 on the side close to the magnetic bracket 5 has a notch (not marked in the figure), and the lower part of the arc extinguishing gap 41 on the side close to the magnetic bracket 5 is not blocked. Specifically, the partition plate 23 is arranged in the middle part of the middle seat 2, separating the buffer area into an upper buffer area 24 and a lower buffer area 25. The arc extinguishing gap 41 without the upper arc shielding rib 221 can be communicated with the upper buffer area 24, and the arc extinguishing gap 41 with the lower arc shielding rib 222 can be communicated with the lower buffer area 25, guiding the arc and arc extinguishing gas in the arc extinguishing gap 41 into the upper buffer area 24 and the lower buffer area 25 respectively. Among them, generally, the space of the upper buffer area 24 is smaller than that of the lower buffer area 25. Therefore, more arcs and arc extinguishing gases need to be guided into the lower buffer area 25. Therefore, an unblocked notch is arranged on the lower buffer area 25. At this time, the arc extinguishing gaps 41 at the outermost edge can be communicated with the lower buffer area 25. Preferably, 3 to 4 arc extinguishing gaps 41 on the side close to the magnetic bracket 5 can be directly communicated with the lower buffer area 25, and only half of the arc extinguishing gaps 41 can be communicated with the upper buffer area 24.

[0037] Further, please refer to Figures 1 to 5 , as a specific embodiment of the arc extinguishing chamber provided by the present invention, a first air outlet 233 is arranged on the side of the upper buffer area 24 away from the magnetic bracket 5, and a second air outlet 234 is arranged on the side of the lower buffer area 25 away from the magnetic bracket 5. Specifically, the first air outlet 233 and the second air outlet 234 are respectively arranged at one end of the upper buffer area 24 and the lower buffer area 25 away from the magnetic bracket 5, that is, away from other components inside the circuit breaker, and the first air outlet 233 and the second air outlet 234 are generally communicated with the outside of the circuit breaker. At this time, it can be avoided that the discharged arc extinguishing gas and arc will affect the normal operation of other components.

[0038] Among them, in order to facilitate the installation of other components inside the circuit breaker, the upper buffer wall 231 and the lower buffer wall 232 are both inclined. The upper buffer wall 231 protrudes from the side of the partition 23 away from the base 1, and the upper buffer wall 231 is located at the tail end of the arc extinguishing chamber, so as to enclose the upper buffer area 24 at the tail end of the arc extinguishing chamber. The upper buffer wall 231 extends obliquely from the side close to the magnetic support 5 towards the side away from the magnetic support 5. At this time, the upper buffer wall 231 can also play a role in guiding the gas flow direction. The lower buffer wall 232 protrudes from the side of the partition 23 close to the base 1 and can support the partition 23. The lower buffer wall 232 is also located at the tail end of the arc extinguishing chamber, so as to enclose the lower buffer area 25 at the tail end of the arc extinguishing chamber. The lower buffer wall 232 extends obliquely from the side close to the magnetic support 5 towards the side away from the magnetic support 5. At this time, the lower buffer wall 232 can also play a role in guiding the gas flow direction.

[0039] Further, referring to Figures 1 to 5 , as a specific implementation manner of the arc extinguishing chamber provided by the present invention, the upper arc blocking rib 221 protrudes from the side of the partition 23 away from the base 1. The upper arc blocking rib 221 includes a plurality of upper blocking blocks arranged at intervals, and each upper blocking block corresponds to the upper part of a corresponding arc extinguishing gap 41; the lower arc blocking rib 222 protrudes from the side of the partition 23 close to the base 1. The lower arc blocking rib 222 includes a plurality of lower blocking blocks arranged at intervals, and each lower blocking block corresponds to the lower part of a corresponding arc extinguishing gap 41; the upper blocking blocks and the lower blocking blocks are arranged in a staggered manner. Specifically, the upper arc blocking rib 221 is a plurality of upper blocking blocks protruding on the partition 23, and the upper blocking blocks evenly block the upper part of the arc extinguishing gap 41 at intervals; the lower arc blocking rib 222 is a plurality of lower blocking blocks protruding on the partition 23, and the lower blocking blocks evenly block the upper part of the arc extinguishing gap 41 at intervals, and no lower blocking block is provided on the side close to the magnetic support 5 to form a notch. The upper blocking blocks and the lower blocking blocks are staggered, that is, the upper part of each arc extinguishing gap 41 is locally blocked by an upper blocking block or a lower blocking block. Of course, according to the actual situation and specific requirements, in other embodiments of the present invention, the upper arc blocking rib 221 and the lower arc blocking rib 222 may also both be a closed plate body, and upper communication holes and lower communication holes are respectively formed at positions corresponding to the arc extinguishing gaps 41, and the upper communication holes and the lower communication holes are arranged in a staggered manner. This is not limited to a single form.

[0040] Further, please refer to Figure 8, as a specific embodiment of the arc extinguishing chamber provided by the present invention, a corner plate 31 is provided on one side of the upper layer stop block located at the end far from the magnetic bracket 5, and the corner plate 31 seals the arc extinguishing gap 41 at the end farthest from the magnetic bracket 5. Specifically, for the arc extinguishing gap 41 on the side farthest from the magnetic bracket 5, this arc extinguishing gap 41 can be communicated with the lower buffer area 25, and the upper layer stop block does not seal this arc extinguishing gap 41. By using this corner plate 31 to seal this arc extinguishing gap 41, it can be combined with the lower layer stop block to jointly seal the arc extinguishing gap 41 on the side farthest from the magnetic bracket 5, ensuring that the air pressure in the part of the arc extinguishing chamber far from the magnetic bracket 5 will not be quickly discharged, ensuring that there is sufficient air pressure in the arc extinguishing chamber to supply the arc to move quickly.

[0041] Preferably, the corner plate 31 is an inclined long strip protruding from the lower surface of the cover body 3. One end of this long strip hole directly seals the upper part of the arc extinguishing gap 41, and the other end is inclined towards the first air outlet 233. At this time, this corner plate 31 can be combined with the upper buffer wall 231 to jointly guide the air flow, ensuring that the arc extinguishing gas in the upper buffer area 24 can be discharged from the first air outlet 233.

[0042] Further, please refer to Figure 6 and Figure 7 , as a specific embodiment of the arc extinguishing chamber provided by the present invention, there is an air outlet channel 26 between the arc extinguishing piece 4 located on the side closest to the magnetic bracket 5 and the edge of the middle seat 2. The middle seat 2 is provided with a third air outlet 27 connecting the air outlet channel 26 and the upper buffer area 24 and a fourth air outlet 28 connecting the air outlet channel 26 and the lower buffer area 25. Specifically, after a plurality of arc extinguishing pieces 4 are placed on the middle seat 2, there is a gap between the arc extinguishing pieces 4 on the outer edges of both sides and the middle seat 2, and this gap is the air outlet channel 26. Among them, the air outlet channel 26 on the side close to the magnetic bracket 5 can be communicated with the upper buffer area 24 and the lower buffer area 25. The arc leading plate of the magnetic bracket 5 can lead the arc into the air outlet channel 26, which can accelerate the arc to quickly enter the arc extinguishing chamber, and make the arc root easily jump from the arc leading angle on the magnetic bracket 5 to the magnetic bracket 5 and quickly move towards the tail of the arc extinguishing chamber, reducing the arc extinguishing time.

[0043] Further, please refer to Figure 7, as a specific implementation of the arc extinguishing chamber provided by the present invention, the cross-sectional area of the third air outlet 27 is larger than that of the fourth air outlet 28. Specifically, for the arc extinguishing gap 41 closest to the air outlet passage 26, its upper end is blocked by the upper stop block, and the lower end is not blocked. The middle seat 2 forms a third air outlet 27 on one side of the outermost arc extinguishing piece 4. The third air outlet 27 can be directly opened on the side wall of the middle seat 2 and communicated with the upper buffer area 24. The middle seat 2 opens a smaller fourth air outlet 28 on one side of the unclosed arc extinguishing gap 41 at the lower end. The fourth air outlet 28 can be communicated with the outermost arc extinguishing gap 41 and flow into the lower buffer area 25. Moreover, the space of the lower buffer area 25 is larger than that of the upper buffer area 24, which can allow more arc extinguishing gas to flow into the lower buffer area 25, accelerate the gas flow in the arc extinguishing chamber, and reduce the arc extinguishing time.

[0044] Further, refer to Figure 6 and Figure 7 , as a specific implementation of the arc extinguishing chamber provided by the present invention, an extension wall 235 that encloses the outer edge of the air outlet passage 26 extends on the side of the upper buffer wall 231 facing the air outlet passage 26. Specifically, the upper buffer wall 231 is arranged at the tail of the arc extinguishing chamber, and the upper buffer wall 231 is used to enclose and form the upper buffer area 24. In order to prevent the arc extinguishing gas and arc entering the upper buffer area 24 from affecting other components, the buffer wall is extended to form the extension wall 235. The extension wall 235 extends from the end of the buffer wall towards the side of the magnetic support 5, and the extended length can be adjusted according to the specific structure and layout of the circuit breaker.

[0045] Further, please refer to Figure 1 , as a specific implementation of the arc extinguishing chamber provided by the present invention, the middle seat 2 also opens a fifth air outlet 29 on one side of the fixing column for fixing the magnetic support 5. Specifically, the fifth air outlet 29 is arranged at the end of the arc extinguishing chamber and is located on one side of the magnetic support 5. At this time, the fifth air outlet 29 can be communicated with the third air outlet 27 and the fourth air outlet 28, so as to form an air flow circulation in the area of the static contact 51, accelerate the flow speed of the arc extinguishing gas, and reduce the time required for arc extinguishing.

[0046] Please refer to Figures 1 to 8 , the present invention also provides a circuit breaker, the circuit breaker includes a magnetic support 5 and the arc extinguishing chamber as described above. The magnetic support 5 can extend to the arc extinguishing chamber, and a static contact 51 is arranged on the magnetic support 5.

[0047] The circuit breaker provided by the present invention has a middle seat 2 disposed in a base 1, and arc extinguishing plates 4 are arranged in an accommodation cavity 21 of the middle seat 2. Thus, the position of the arc extinguishing plates 4 is defined by the outer edge of the middle seat 2. An arc can form an arc extinguishing channel through an arc extinguishing gap 41, and the tail ends of the arc extinguishing plates 4 are not completely blocked. The upper arc blocking ribs 221 and the lower arc blocking ribs 222 which are staggered with each other respectively block the tail ends of the arc extinguishing plates 4, that is, only the upper part or the lower part of the arc extinguishing gap 41 is blocked, so as to guide the arc extinguishing air flow to form a connected ventilation channel, connect the gap between the arc extinguishing plates 4 and the outside, thereby accelerating the gas flow, making it easy for the arc to move from the magnetic bracket 5 to the arc extinguishing chamber and move towards the tail of the arc extinguishing chamber, and reducing the arc extinguishing time.

[0048] Obviously, the above embodiments are only examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. Arc extinguishing chamber, comprising a base (1), a middle seat (2) disposed on the base (1), and a cover body (3) covering the base (1) and the middle seat (2). An accommodation cavity (21) for accommodating a plurality of arc extinguishing plates (4) is formed in the middle seat (2). The arc extinguishing plates (4) are arranged perpendicular to the base (1), and an arc extinguishing gap (41) is provided between adjacent arc extinguishing plates (4). A magnetic support (5) extends to the arc extinguishing plates (4), and it is characterized in that: The middle seat (2) is provided with an arc-blocking rib group (22) for blocking the arc extinguishing gap (41) at one end far from the magnetic bracket (5). The arc-blocking rib group (22) includes an upper arc-blocking rib (221) and a lower arc-blocking rib (222) which are arranged in an interleaved manner. The upper arc-blocking rib (221) and the lower arc-blocking rib (222) respectively block the upper and lower parts of two adjacent arc extinguishing gaps (41). The lower arc-blocking rib (222) on the side close to the magnetic bracket (5) has a notch, and the lower part of the arc extinguishing gap (41) on the side close to the magnetic bracket (5) is not blocked.

2. The arc extinguishing chamber according to claim 1, characterized in that: A partition plate (23) is horizontally arranged on the middle seat (2). The partition plate (23) is arranged parallel to the base (1), and an upper buffer wall (231) protrudes from the outer edge of the partition plate (23) towards the cover body (3). An upper buffer area (24) is formed by enclosing between the partition plate (23), the cover body (3) and the upper buffer wall (231). The upper part of the arc extinguishing gap (41) is communicated with the upper buffer area (24). A lower buffer wall (232) protrudes from the outer edge of the partition plate (23) towards the base (1). A lower buffer area (25) is formed between the partition plate (23), the base (1) and the lower buffer wall (232). The lower part of the arc extinguishing gap (41) is communicated with the lower buffer area (25).

3. The arc extinguishing chamber according to claim 2, characterized in that: The upper arc-blocking rib (221) protrudes from the side of the partition plate (23) far from the base (1). The upper arc-blocking rib (221) includes a plurality of upper blocking blocks arranged at intervals, and each upper blocking block corresponds to the upper part of an arc extinguishing gap (41). The lower arc-blocking rib (222) protrudes from the side of the partition plate (23) close to the base (1). The lower arc-blocking rib (222) includes a plurality of lower blocking blocks arranged at intervals, and each lower blocking block corresponds to the lower part of an arc extinguishing gap (41). The upper blocking blocks and the lower blocking blocks are arranged in an interleaved manner.

4. The arc extinguishing chamber according to claim 3, characterized in that: A corner plate (31) is arranged on one side of the upper blocking block at the end far from the magnetic bracket (5). The corner plate (31) blocks the arc extinguishing gap (41) at the end farthest from the magnetic bracket (5).

5. The arc extinguishing chamber according to claim 2, characterized in that: A first air outlet (233) is formed on the side of the upper buffer area (24) far from the magnetic bracket (5), and a second air outlet (234) is formed on the side of the lower buffer area (25) far from the magnetic bracket (5).

6. The arc extinguishing chamber according to claim 5, characterized in that: An air outlet channel (26) is formed between the arc extinguishing piece (4) on the side closest to the magnetic bracket (5) and the edge of the middle seat (2). A third air outlet (27) connecting the air outlet channel (26) and the upper buffer area (24) and a fourth air outlet (28) connecting the air outlet channel (26) and the lower buffer area (25) are formed on the middle seat (2).

7. The arc extinguishing chamber according to claim 6, characterized in that: The cross-sectional area of the third air outlet (27) is larger than the cross-sectional area of the fourth air outlet (28).

8. The arc extinguishing chamber according to claim 6, characterized in that: The upper buffer wall (231) extends on the side facing the air outlet channel (26) with an extension wall (235) enclosing the outer edge of the air outlet channel (26).

9. The arc extinguishing chamber according to any one of claims 1 to 7, characterized in that: On one side of the fixing column for fixing the magnetic bracket (5), the middle seat (2) is further provided with a fifth air outlet (29).

10. Circuit breaker, characterized in that: It includes a magnetic bracket (5) and an arc extinguishing chamber as described in any one of claims 1 to 9. The magnetic bracket (5) extends to the arc extinguishing chamber, and a static contact (51) is provided on the magnetic bracket (5).

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