kV-class intelligent AC molded case circuit breaker

Abstract

The present invention discloses a kV-class intelligent AC molded case circuit breaker, which includes a housing, a contact mechanism, an arc extinguishing mechanism, and a closing and opening operating mechanism. The contact mechanism includes multiple sets of moving contacts and static contacts. A plurality of incoming power connection screws are provided on the housing, and each incoming power connection screw is electrically connected to a corresponding static contact. The arc extinguishing mechanism includes arc extinguishing chambers adapted to the respective static contacts. The housing is provided with a plurality of mounting grooves for mounting the incoming power connection screws. Each incoming power connection screw is located at the bottom of a corresponding mounting groove, and each mounting groove communicates with a corresponding arc extinguishing chamber. At least part of the arc extinguishing grids of each arc extinguishing chamber extends into a corresponding mounting groove. By making at least part of the arc extinguishing grids of each arc extinguishing chamber extend into a corresponding mounting groove, the present invention enables the arc extinguishing effect of the arc extinguishing chamber not to be restricted by its installation space, effectively improves its arc extinguishing effect, and enables the present invention to be applied to kV-class AC circuits to meet the arc extinguishing requirements.

Description

Technical Field

[0001] The present invention belongs to the technical field of air switches, and particularly relates to a kV-class intelligent AC molded case circuit breaker. Background Art

[0002] There are common regulations for the size specifications of traditional AC molded case circuit breakers. The limited volume restricts their arc extinguishing ability, and they are generally used for circuits below 660V. Therefore, existing kV-class AC circuits basically use universal circuit breakers for circuit breaking and protection. However, compared with molded case circuit breakers, universal circuit breakers are larger in volume and higher in price under the same conditions. Summary of the Invention

[0003] The object of the present invention is to provide a kV-class intelligent AC molded case circuit breaker that can be used for kV-class AC circuits.

[0004] The technical solution for achieving the object of the present invention is: a kV-class intelligent AC molded case circuit breaker, including a housing, a contact mechanism, an arc extinguishing mechanism, and a closing and opening operating mechanism. The contact mechanism includes multiple sets of moving contacts and static contacts. Multiple incoming power connection screws are provided on the housing, and each incoming power connection screw is electrically connected to a corresponding static contact. The arc extinguishing mechanism includes arc extinguishing chambers adapted to the respective static contacts. The housing is provided with multiple mounting grooves for mounting the incoming power connection screws. Each incoming power connection screw is located at the bottom of a corresponding mounting groove. Each mounting groove communicates with a corresponding arc extinguishing chamber. At least part of the arc extinguishing grids in each arc extinguishing chamber extends into a corresponding mounting groove.

[0005] Further, the arc extinguishing grids extending into the mounting grooves in each arc extinguishing chamber are higher than the incoming power connection screws.

[0006] Further, each arc extinguishing chamber includes multiple grids and two insulating partitions. The multiple grids are arranged in sequence from top to bottom. The two side ends of the multiple grids are fixedly arranged on the insulating partitions to form an integral part. A notch is provided at one end of each grid close to the moving contact. The notches of the multiple grids in each arc extinguishing chamber combine to form an arc leading channel that penetrates up and down. A moving contact point is provided on the moving contact. During the closing and opening process of the moving contact points of each moving contact, the moving contact points are always in the arc leading channel of a corresponding arc extinguishing chamber. An arc extinguishing channel is formed between two adjacent grids up and down. Each arc extinguishing channel communicates with a corresponding mounting groove. The tails of the multiple grids at the upper end in each arc extinguishing chamber extend into the mounting groove.

[0007] Further, the tails of the multiple grids are located inside a corresponding incoming power connection screw.

[0008] Further, each arc extinguishing chamber includes an upper arc guiding grid plate, six upper arc extinguishing grid plates, two middle arc extinguishing grid plates, two lower arc extinguishing grid plates, a lower arc guiding grid plate and two insulating partitions; the upper arc guiding grid plate, the upper arc extinguishing grid plates, the middle arc extinguishing grid plates, the lower arc extinguishing grid plates and the lower arc guiding grid plate are arranged in sequence from top to bottom; the upper arc guiding grid plate includes an upper arc guiding plate, an upper arc guiding notch arranged at the edge of the upper arc guiding plate, an upper arc guiding folding plate arranged in the upper arc guiding notch, and upper arc guiding inserting bosses arranged at both ends of the upper arc guiding plate; the upper arc guiding plate includes a horizontally arranged upper arc guiding straight plate portion and an inclined downwardly arranged upper arc guiding inclined plate portion; the upper arc guiding folding plate is higher than the upper arc guiding inclined plate portion; the upper arc guiding notch is located on the upper arc guiding inclined plate portion; one end of the upper arc guiding folding plate is connected to the plate body of the upper arc guiding inclined plate portion, and the other end of the upper arc guiding folding plate extends obliquely upward along the direction away from the upper arc guiding straight plate portion; each of the upper arc extinguishing grid plates includes an upper arc extinguishing plate, an upper arc extinguishing notch arranged at the edge of the upper arc extinguishing plate, and upper arc extinguishing inserting bosses arranged at both ends of the upper arc extinguishing plate; the upper arc extinguishing plate includes a horizontally arranged upper arc extinguishing straight plate portion and an inclined downwardly arranged upper arc extinguishing inclined plate portion; the upper arc extinguishing notch is located on the upper arc extinguishing inclined plate portion; each of the middle arc extinguishing grid plates includes a middle arc extinguishing plate, a middle arc extinguishing notch arranged at the edge of the middle arc extinguishing plate, and middle arc extinguishing inserting bosses arranged at both ends of the middle arc extinguishing plate; the middle arc extinguishing plate includes a horizontally arranged middle arc extinguishing straight plate portion and an inclined downwardly arranged middle arc extinguishing inclined plate portion; the middle arc extinguishing notch is located on the middle arc extinguishing inclined plate portion; each of the lower arc extinguishing grid plates includes a lower arc extinguishing plate, a lower arc extinguishing notch arranged at the edge of the lower arc extinguishing plate, and lower arc extinguishing inserting bosses arranged at both ends of the lower arc extinguishing plate; the lower arc guiding grid plate includes a lower arc guiding plate, a lower arc guiding notch arranged at the edge of the lower arc guiding plate, a lower arc guiding folding plate arranged in the lower arc guiding notch, and lower arc guiding inserting bosses arranged at both ends of the lower arc guiding plate; the lower arc guiding folding plate is lower than the lower arc guiding plate; the shapes of the upper arc guiding notch, the upper arc extinguishing notch, the middle arc extinguishing notch, the lower arc extinguishing notch and the lower arc guiding notch are all square; the upper arc guiding notch, the upper arc extinguishing notch, the middle arc extinguishing notch, the lower arc extinguishing notch and the lower arc guiding notch enclose to form the arc ignition channel; the upper arc guiding straight plate portion, the upper arc extinguishing straight plate portion and the middle arc extinguishing straight plate portion are arranged in parallel, and the upper arc guiding inclined plate portion, the upper arc extinguishing inclined plate portion, the middle arc extinguishing inclined plate portion, the lower arc extinguishing plate and the lower arc guiding plate are arranged in parallel; the ends of the upper arc guiding grid plate, the upper arc extinguishing grid plates and the middle arc extinguishing grid plates away from the moving contact extend into a corresponding mounting groove, and the upper arc guiding grid plate, the upper arc extinguishing grid plates and the middle arc extinguishing grid plates are higher than the corresponding incoming power connection screws.

[0009] Further, the ends of the upper arc guiding grid plate, the upper arc extinguishing grid plates and the middle arc extinguishing grid plates away from the moving contact are on the same vertical line and are located inside a corresponding incoming power connection screw.

[0010] Further, each arc extinguishing chamber further includes a metal arc baffle located on the side of the lower arc extinguishing grid away from the moving contact. The baffle is located directly below the lowermost middle arc extinguishing straight plate portion, and there is an exhaust gap between the top end of the baffle and the bottom wall of the middle arc extinguishing straight plate portion.

[0011] Further, the top end of the baffle is higher than the incoming power connection screw; the baffles are provided with mesh holes, and an insulating sealing plate is provided on the outer side of each baffle.

[0012] Further, each arc extinguishing chamber further includes two gas generating columns; each gas generating column includes a gas generating wall located in the arc ignition channel, the surface of the gas generating wall is a smooth surface, and a plurality of insertion slots are provided on the other side wall body of each gas generating column opposite to the gas generating wall; the end plates of the upper arc guiding inclined plate portion on both sides of the upper arc guiding notch form two upper arc guiding pins, the end plates of the upper arc extinguishing inclined plate portion on both sides of the upper arc extinguishing notch form two upper arc extinguishing pins, and the end plates of the middle arc extinguishing inclined plate portion on both sides of the middle arc extinguishing notch form two middle arc extinguishing pins; the upper arc guiding pins, upper arc extinguishing pins, and lower arc extinguishing pins are all inserted into the corresponding insertion slots of a gas generating column.

[0013] Further, each static contact includes a power input plate, a power output plate, a static contact point, and a gas generating sleeve; the static contact point is located in a corresponding arc ignition channel, and the gas generating sleeve is located directly below a corresponding arc extinguishing chamber; the power input plate and the power output plate are flat plate-shaped.

[0014] The power input plate is provided with a power connection hole adapted to the incoming power connection screw, the power output plate is provided with a U-shaped current limiting hole, two current limiting conductive parts located on both sides of the U-shaped current limiting hole, a diversion plate portion located on the side of the U-shaped current limiting hole away from the power input plate, and a static contact support portion surrounded by the U-shaped current limiting hole; the static contact point is arranged at the upper end of the static contact support portion; the two current limiting conductive parts are connected to the power input plate, and the two current limiting conductive parts, the diversion plate portion, and the static contact support portion are connected; the gas generating sleeve is sleeved on the power output plate, the top end of the gas generating sleeve is provided with a through hole, and the static contact point exposes through the through hole.

[0015] Further, two circular current limiting through holes are further provided on the power input plate.

[0016] The present invention has positive effects: (1) By making some arc extinguishing grid of each arc extinguishing chamber extend into a corresponding installation groove, the arc extinguishing effect of the arc extinguishing chamber is no longer limited by its installation space, effectively improving its arc extinguishing effect, so that the present invention can be applied to kV-level AC lines to meet the arc extinguishing requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0018] Figure 2 isFigure 1 A sectional view of the shown intelligent AC molded case circuit breaker;

[0019] Figure 3 is Figure 1 A schematic three-dimensional structure diagram of the shown intelligent AC molded case circuit breaker after removing the housing;

[0020] Figure 4 is Figure 1 A schematic three-dimensional structure diagram of the cooperation between the arc extinguishing chamber and the static contact in the shown intelligent AC molded case circuit breaker;

[0021] Figure 5 is Figure 4 A semi-sectional view of the shown arc extinguishing chamber and static contact;

[0022] Figure 6 is Figure 4 An exploded view of the shown arc extinguishing chamber and static contact;

[0023] Figure 7 is Figure 1 A schematic three-dimensional structure diagram of the gas generating column in the shown intelligent AC molded case circuit breaker;

[0024] Figure 8 is Figure 7 Another schematic three-dimensional structure diagram of the shown gas generating column;

[0025] Figure 9 is Figure 8 A semi-sectional structure diagram of the shown gas generating column;

[0026] Figure 10 is Figure 1 A schematic three-dimensional structure diagram of the upper arc guiding grid plate in the shown intelligent AC molded case circuit breaker;

[0027] Figure 11 is Figure 10 A front view of the shown upper arc guiding grid plate;

[0028] Figure 12 is Figure 10 A semi-sectional structure diagram of the shown upper arc guiding grid plate;

[0029] Figure 13 is Figure 1 A schematic three-dimensional structure diagram of the upper arc extinguishing grid plate in the shown intelligent AC molded case circuit breaker;

[0030] Figure 14 is Figure 13 A front view of the shown upper arc extinguishing grid plate;

[0031] Figure 15 is Figure 13 A semi-sectional structure diagram of the shown upper arc extinguishing grid plate;

[0032] Figure 16 For Figure 1 A three-dimensional structure diagram of the arc extinguishing grid plates in the intelligent AC molded case circuit breaker shown;

[0033] Figure 17 For Figure 16 A front view of the arc extinguishing grid plates shown;

[0034] Figure 18 For Figure 16 A half-sectional structure diagram of the arc extinguishing grid plates shown;

[0035] Figure 19 For Figure 1 A three-dimensional structure diagram of the lower arc extinguishing grid plates in the intelligent AC molded case circuit breaker shown;

[0036] Figure 20 For Figure 19 A front view of the lower arc extinguishing grid plates shown;

[0037] Figure 21 For Figure 19 A half-sectional structure diagram of the lower arc extinguishing grid plates shown;

[0038] Figure 22 For Figure 1 A three-dimensional structure diagram of the lower arc guiding grid plates in the intelligent AC molded case circuit breaker shown;

[0039] Figure 23 For Figure 22 A front view of the lower arc guiding grid plates shown;

[0040] Figure 24 For Figure 22 A half-sectional structure diagram of the lower arc guiding grid plates shown;

[0041] Figure 25 For Figure 1 A three-dimensional structure diagram of the static contact in the intelligent AC molded case circuit breaker shown;

[0042] Figure 26 For Figure 25 An exploded view of the static contact shown;

[0043] Figure 27 For Figure 25 Another exploded view of the static contact shown.

[0044] The labels shown in the attached drawings are: housing 1, mounting groove 11, contact mechanism 2, moving contact 21, static contact 22, power input plate 221, power connection hole 2211, circular current-limiting through hole 2212, power output plate 222, U-shaped current-limiting hole 2221, current-limiting conductive part 2222, current-carrying plate part 2223, static contact support part 2224, static contact 223, gas-producing sleeve 224, through hole 2241, arc extinguishing mechanism 3, opening and closing operating mechanism 4, power input connection screw 5, arc extinguishing chamber 6, upper arc guiding grid plate 61, upper arc guiding plate 611, upper arc guiding notch 612, upper arc guiding folding plate 613, upper arc guiding plugging convex platform 614, upper arc guiding straight plate part 615, upper arc guiding inclined plate part 616, upper arc guiding pin 617, upper arc extinguishing grid plate 62, upper arc extinguishing plate 621, upper arc extinguishing notch 622, upper arc extinguishing plugging convex platform 623, upper arc extinguishing straight plate part 624, upper arc extinguishing inclined plate part 625, upper arc extinguishing pin 626, middle arc extinguishing grid plate 63, middle arc extinguishing plate 631, middle arc extinguishing notch 632, middle arc extinguishing plugging convex platform 633, middle arc extinguishing straight plate part 634, middle arc extinguishing inclined plate part 635, middle arc extinguishing pin 636, lower arc extinguishing grid plate 64, lower arc extinguishing plate 641, lower arc extinguishing notch 642, lower arc extinguishing plugging convex platform 643, lower arc guiding grid plate 65, lower arc guiding plate 651, lower arc guiding notch 652, lower arc guiding folding plate 653, lower arc guiding plugging convex platform 654, insulating partition 66, arc leading channel 67, gas-producing column 68, gas-producing wall 681, plugging groove 682, arc blocking plate 7, mesh hole 71, insulating sealing plate 72, exhaust gap 100. Detailed implementation mode

[0045] (Embodiment 1)

[0046] This embodiment is a kV-class intelligent AC molded case circuit breaker, as shown in Figures 1 to 3 shown, including a housing 1, a contact mechanism 2, an arc extinguishing mechanism 3 and an opening and closing operating mechanism 4. The contact mechanism 2 includes multiple sets of moving contacts 21 and static contacts 22. A plurality of power input connection screws 5 are provided on the housing 1, and each power input connection screw 5 is electrically connected to a corresponding static contact 22; the arc extinguishing mechanism 3 includes an arc extinguishing chamber 6 adapted to each static contact 22; the housing 1 is provided with three mounting grooves 11 for mounting the power input connection screws 5, each power input connection screw 5 is located at the bottom of a corresponding mounting groove 11, each mounting groove 11 is communicated with a corresponding arc extinguishing chamber 6, and at least part of the arc extinguishing grid plates of each arc extinguishing chamber extend into a corresponding mounting groove 11.

[0047] Traditional molded case circuit breakers are also provided with mounting grooves 11 for mounting the power input connection screws 5, but the arc extinguishing grid plates of each arc extinguishing chamber do not extend into this mounting groove. Therefore, the size and arc extinguishing ability of the traditional arc extinguishing chamber are limited by its installation space. In this embodiment, by designing part of the arc extinguishing grid plates to extend into the mounting groove 11, this limitation can be broken, effectively enhancing its arc extinguishing effect and meeting the arc extinguishing requirements during the opening of kV-class alternating current.

[0048] See Figure 3 As shown, the arc extinguishing grids extended from each arc extinguishing chamber 6 into the installation groove 11 are higher than the incoming power connection screw 5. This structure is to prevent the residual arcs flying out from the arc extinguishing grids from eroding the incoming power connection screw 5.

[0049] See Figures 4 to 6 As shown, each arc extinguishing chamber 6 includes a plurality of grids and two insulating partitions 66. The plurality of grids are arranged in sequence from top to bottom, and both side ends of the plurality of grids are fixedly arranged on the insulating partitions 66 to form an integral part; a notch is provided at one end of each grid close to the moving contact 21; the notches of the plurality of grids in each arc extinguishing chamber 6 combine to form an arc leading channel 67 penetrating up and down; a moving contact is provided on the moving contact 21, and during the opening and closing process of the moving contacts 21 of each moving contact 21, its moving contact is always in the arc leading channel 67 of a corresponding arc extinguishing chamber 6; an arc extinguishing channel is formed by clamping between two adjacent grids up and down, and each arc extinguishing channel communicates with a corresponding installation groove 11; the tail ends of the plurality of grids at the upper end in each arc extinguishing chamber 6 extend into the installation groove 11. This structure is relatively reasonable and compact, so that during the opening process, the moving contact is entirely located in the arc leading channel 67, that is, semi-surrounded by the arc extinguishing chamber, ensuring the arc extinguishing effect during the opening process.

[0050] Each of the arc extinguishing chambers 6 includes an upper arc guiding grid 61, six upper arc extinguishing grids 62, two middle arc extinguishing grids 63, two lower arc extinguishing grids 64, a lower arc guiding grid 65 and two insulating partitions 66; the upper arc guiding grid 61, the upper arc extinguishing grids 62, the middle arc extinguishing grids 63, the lower arc extinguishing grids 64, and the lower arc guiding grid 65 are arranged in sequence from top to bottom.

[0051] See Figures 10 to 12 As shown, the upper arc guiding grid 61 includes an upper arc guiding plate 611, an upper arc guiding notch 612 provided at the edge of the upper arc guiding plate 611, an upper arc guiding folding plate 613 provided in the upper arc guiding notch 612, and upper arc guiding insertion bosses 614 provided at both side ends of the upper arc guiding plate 611; the upper arc guiding plate 611 includes a horizontally arranged upper arc guiding straight plate portion 615 and an inclined downwardly arranged upper arc guiding inclined plate portion 616; the upper arc guiding folding plate 613 is higher than the upper arc guiding inclined plate portion 616; the upper arc guiding notch 612 is located on the upper arc guiding inclined plate portion 616; one end of the upper arc guiding folding plate 613 is connected to the plate body of the upper arc guiding inclined plate portion 616, and the other end of the upper arc guiding folding plate 613 extends obliquely upward along the direction away from the upper arc guiding straight plate portion 615.

[0052] See Figures 13 to 15As shown, each upper arc extinguishing grid plate 62 includes an upper arc extinguishing plate 621, an upper arc extinguishing notch 622 provided at the edge of the upper arc extinguishing plate 621, and upper arc extinguishing insertion bosses 623 provided at both ends of the upper arc extinguishing plate 621; the upper arc extinguishing plate 621 includes a horizontally arranged upper arc extinguishing straight plate portion 624 and an inclined downwardly arranged upper arc extinguishing inclined plate portion 625; the upper arc extinguishing notch 622 is located on the upper arc extinguishing inclined plate portion 625.

[0053] See Figures 16 to 18 As shown, each middle arc extinguishing grid plate 63 includes a middle arc extinguishing plate 631, a middle arc extinguishing notch 632 provided at the edge of the middle arc extinguishing plate 631, and middle arc extinguishing insertion bosses 633 provided at both ends of the middle arc extinguishing plate 631; the middle arc extinguishing plate 631 includes a horizontally arranged middle arc extinguishing straight plate portion 634 and an inclined downwardly arranged middle arc extinguishing inclined plate portion 635; the middle arc extinguishing notch 632 is located on the middle arc extinguishing inclined plate portion 635.

[0054] The tail ends of the upper arc guiding plates 611, the tail ends of the upper arc extinguishing plates 621, and the tail ends of the middle arc extinguishing plates 631 of each arc extinguishing chamber extend into a corresponding installation groove 11, and the end portions of the upper arc guiding plates 611, the end portions of the upper arc extinguishing plates 621, and the end portions of the middle arc extinguishing plates 631 of each arc extinguishing chamber are flush along the vertical direction.

[0055] See Figures 19 to 21 As shown, each lower arc extinguishing grid plate 64 includes a lower arc extinguishing plate 641, a lower arc extinguishing notch 642 provided at the edge of the lower arc extinguishing plate 641, and lower arc extinguishing insertion bosses 643 provided at both ends of the lower arc extinguishing plate 641.

[0056] See Figures 22 to 24 As shown, the lower arc guiding grid plate 65 includes a lower arc guiding plate 651, a lower arc guiding notch 652 provided at the edge of the lower arc guiding plate 651, a lower arc guiding folding plate 653 provided in the lower arc guiding notch 652, and lower arc guiding insertion bosses 654 provided at both ends of the lower arc guiding plate 651; the lower arc guiding folding plate 653 is lower than the lower arc guiding plate 651, and the position of the lower arc guiding folding plate 653 ensures better guiding of the arc below into the arc extinguishing chamber.

[0057] The shapes of the upper guide arc notch 612, upper arc extinguishing notch 622, middle arc extinguishing notch 632, lower arc extinguishing notch 642, and lower guide arc notch 652 are all square; the upper guide arc notch 612, upper arc extinguishing notch 622, middle arc extinguishing notch 632, lower arc extinguishing notch 642, and lower guide arc notch 652 enclose to form the arc ignition channel 67; the upper guide arc straight plate portion 615, upper arc extinguishing straight plate portion 624, and middle arc extinguishing straight plate portion 634 are arranged in parallel, and the upper guide arc inclined plate portion 616, upper arc extinguishing inclined plate portion 625, middle arc extinguishing inclined plate portion 635, lower arc extinguishing plate 641, and lower guide arc plate 651 are arranged in parallel; one end of the upper guide arc grid piece 61, upper arc extinguishing grid piece 62, and middle arc extinguishing grid piece 63 far from the moving contact 21 extends into a corresponding installation groove 11, and the upper guide arc grid piece 61, upper arc extinguishing grid piece 62, and middle arc extinguishing grid piece 63 are higher than the corresponding incoming power connection screw 5.

[0058] One end of the upper guide arc grid piece 61, upper arc extinguishing grid piece 62, and middle arc extinguishing grid piece 63 far from the moving contact 21 is on the same vertical line and is located inside a corresponding incoming power connection screw 5. This structure can prevent one end of the upper guide arc grid piece 61, upper arc extinguishing grid piece 62, and middle arc extinguishing grid piece 63 far from the moving contact 21 from affecting the electrical connection and fastening installation operation of the incoming power connection screw.

[0059] The upper guide arc folding plate 613 and the lower guide arc folding plate 653 are clamped to form a conical opening for guiding the arc into the arc extinguishing chamber.

[0060] See Figures 4 to 6 As shown, each arc extinguishing chamber further includes a metal arc baffle 7 on the side of the lower arc extinguishing grid piece 64 far from the moving contact 21. The baffle 7 is located directly below the lowermost middle arc extinguishing straight plate portion 634, and there is an exhaust gap 100 between the top end of the baffle 7 and the bottom wall of the middle arc extinguishing straight plate portion 634. The top end of the baffle 7 is higher than the incoming power connection screw 5; each baffle 7 is provided with mesh holes 71, and an insulating sealing plate 72 is provided outside each baffle 7. The residual arc can overflow from the exhaust gap 100, and the baffle 7 effectively prevents the residual arc overflowing from the arc extinguishing chamber from burning the incoming power connection screw 5.

[0061] See Figures 7 to 9 As shown, each arc extinguishing chamber 6 further includes two gas generating columns 68; each gas generating column 68 includes a gas generating wall 681 located in the arc ignition channel 67. The surface of the gas generating wall 681 is a smooth surface, and a plurality of insertion slots 682 are provided on the other side wall body of each gas generating column 68 opposite to the gas generating wall 681.

[0062] The upper guiding arc inclined plate part 616 forms two upper guiding arc pins 617 at the ends of the plate bodies on both sides of the upper guiding arc notch 612. Each upper arc extinguishing inclined plate part 625 forms two upper arc extinguishing pins 626 at the ends of the plate bodies on both sides of the upper arc extinguishing notch 622. Each middle arc extinguishing inclined plate part 635 forms two middle arc extinguishing pins 636 at the ends of the plate bodies on both sides of the middle arc extinguishing notch 632. The upper guiding arc pins 617, the upper arc extinguishing pins 626, and the lower arc extinguishing pins are inserted into the insertion slots 682 of corresponding one gas generating column 68.

[0063] The gas generating column not only enhances the stability of each arc extinguishing grid piece, but also, since the gas generating column is made of gas generating material, when an electric arc is generated, part of the surface material of the gas generating wall 681 is vaporized to form a local high pressure, which is beneficial to quickly blowing the electric arc into the arc extinguishing chamber, effectively increasing the arc extinguishing speed.

[0064] See Figures 25 to 27 As shown, each static contact 22 includes a power input plate 221, a power output plate 222, a static contact point 223, and a gas generating sleeve 224. The static contact point 223 is located in a corresponding one arc guiding channel 67, and the gas generating sleeve 224 is located directly below a corresponding one arc extinguishing chamber 6. The power input plate 221 and the power output plate 222 are flat plate-shaped. The power input plate 221 is provided with a power connection hole 2211 adapted to the power connection screw 5. The power output plate 222 is provided with a U-shaped current limiting hole 2221, two current limiting and conducting parts 2222 on both sides of the U-shaped current limiting hole 2221, a diversion plate part 2223 on the side of the U-shaped current limiting hole 2221 away from the power input plate 221, and a static contact supporting part 2224 surrounded by the U-shaped current limiting hole 2221. The static contact point 223 is arranged at the upper end of the static contact supporting part 2224. The two current limiting and conducting parts 2222 are connected to the power input plate 221, and the two current limiting and conducting parts 2222, the diversion plate part 2223, and the static contact supporting part 2224 are connected. The gas generating sleeve 224 is sleeved on the power output plate 222, and the top end of the gas generating sleeve 224 is provided with a through hole 2241, and the static contact point 223 exposes the through hole 2241. In this embodiment, since the static contact 22 has the gas generating sleeve 224, it not only enhances the insulation performance between the static contact and surrounding electrical components, but also can generate local high-pressure gas on the side of the static contact close to the arc extinguishing chamber when an electric arc is generated, which is beneficial to quickly blowing the electric arc into the arc extinguishing chamber, effectively increasing the arc extinguishing speed.

[0065] The power input plate 221 is also provided with two circular current limiting through holes 2212. The current limiting through holes 2212 can limit the current passing through the power input plate to a certain extent, causing it to be shunted. When passing the same magnitude of current, compared with without the current limiting through holes, it effectively reduces the heat generation, not only improving the safety performance but also reducing the loss.

[0066] It is obvious to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims concerned.

Claims

1. A kV-class intelligent AC molded case circuit breaker, comprising a housing (1), a contact mechanism (2), an arc extinguishing mechanism (3), and a closing and opening operating mechanism (4). The contact mechanism (2) includes multiple sets of moving contacts (21) and static contacts (22). A plurality of incoming power connection screws (5) are provided on the housing (1), and each incoming power connection screw (5) is electrically connected to a corresponding static contact (22). The arc extinguishing mechanism (3) includes arc extinguishing chambers (6) adapted to the respective static contacts (22). It is characterized in that: The housing (1) is provided with a plurality of mounting grooves (11) for mounting the incoming power connection screws (5). Each incoming power connection screw (5) is located at the bottom of a corresponding mounting groove (11). Each mounting groove (11) communicates with a corresponding arc extinguishing chamber (6), and at least part of the arc extinguishing grid plates of each arc extinguishing chamber (6) extends into a corresponding mounting groove (11); Each arc extinguishing chamber (6) includes a plurality of grid plates and two insulating partitions (66). The plurality of grid plates are arranged in sequence up and down. The two side ends of the plurality of grid plates are fixedly arranged on the insulating partitions (66) to form an integral part. A notch is provided at one end of each grid plate close to the moving contact (21). The notches of the plurality of grid plates in each arc extinguishing chamber (6) combine to form an arc leading channel (67) that penetrates up and down; Moving contacts (21) are provided with moving contact points. During the closing and opening process of the moving contact points of each moving contact (21), the moving contact points are always in the arc leading channel (67) of a corresponding arc extinguishing chamber (6); An arc extinguishing channel is formed by clamping between two adjacent grid plates up and down. Each arc extinguishing channel communicates with a corresponding mounting groove (11). The tails of the plurality of grid plates at the upper end in each arc extinguishing chamber (6) extend into the mounting groove (11); The tails of the plurality of grid plates are located inside a corresponding incoming power connection screw (5); Each of the arc extinguishing chambers (6) includes an upper arc guiding grid plate (61), six upper arc extinguishing grid plates (62), two middle arc extinguishing grid plates (63), two lower arc extinguishing grid plates (64), a lower arc guiding grid plate (65), and two insulating partitions (66). The upper arc guiding grid plate (61), the upper arc extinguishing grid plates (62), the middle arc extinguishing grid plates (63), the lower arc extinguishing grid plates (64), and the lower arc guiding grid plate (65) are arranged in sequence from top to bottom; The upper arc guiding grid plate (61) includes an upper arc guiding plate (611), an upper arc guiding notch (612) provided at the edge of the upper arc guiding plate (611), an upper arc guiding folding plate (613) provided in the upper arc guiding notch (612), and upper arc guiding insertion bosses (614) provided at both side ends of the upper arc guiding plate (611). The upper arc guiding plate (611) includes a horizontally arranged upper arc guiding straight plate portion (615) and an inclined downwardly arranged upper arc guiding inclined plate portion (616). The upper arc guiding folding plate (613) is higher than the upper arc guiding inclined plate portion (616). The upper arc guiding notch (612) is located on the upper arc guiding inclined plate portion (616). One end of the upper arc guiding folding plate (613) is connected to the plate body of the upper arc guiding inclined plate portion (616), and the other end of the upper arc guiding folding plate (613) extends obliquely upward along the direction away from the upper arc guiding straight plate portion (615); Each of the upper arc extinguishing grid plates (62) includes an upper arc extinguishing plate (621), an upper arc extinguishing notch (622) provided at the edge of the upper arc extinguishing plate (621), and upper arc extinguishing insertion bosses (623) provided at both ends of the upper arc extinguishing plate (621); the upper arc extinguishing plate (621) includes a horizontally arranged upper arc extinguishing straight plate portion (624) and an inclined downwardly arranged upper arc extinguishing inclined plate portion (625); the upper arc extinguishing notch (622) is located on the upper arc extinguishing inclined plate portion (625); Each of the middle arc extinguishing grid plates (63) includes a middle arc extinguishing plate (631), a middle arc extinguishing notch (632) provided at the edge of the middle arc extinguishing plate (631), and middle arc extinguishing insertion bosses (633) provided at both ends of the middle arc extinguishing plate (631); the middle arc extinguishing plate (631) includes a horizontally arranged middle arc extinguishing straight plate portion (634) and an inclined downwardly arranged middle arc extinguishing inclined plate portion (635); the middle arc extinguishing notch (632) is located on the middle arc extinguishing inclined plate portion (635); Each of the lower arc extinguishing grid plates (64) includes a lower arc extinguishing plate (641), a lower arc extinguishing notch (642) provided at the edge of the lower arc extinguishing plate (641), and lower arc extinguishing insertion bosses (643) provided at both ends of the lower arc extinguishing plate (641); The lower arc guiding grid plate (65) includes a lower arc guiding plate (651), a lower arc guiding notch (652) provided at the edge of the lower arc guiding plate (651), a lower arc guiding folding plate (653) provided in the lower arc guiding notch (652), and lower arc guiding insertion bosses (654) provided at both ends of the lower arc guiding plate (651); the lower arc guiding folding plate (653) is lower than the lower arc guiding plate (651); The shapes of the upper arc guiding notch (612), the upper arc extinguishing notch (622), the middle arc extinguishing notch (632), the lower arc extinguishing notch (642), and the lower arc guiding notch (652) are all square; The upper arc guiding notch (612), the upper arc extinguishing notch (622), the middle arc extinguishing notch (632), the lower arc extinguishing notch (642), and the lower arc guiding notch (652) enclose to form the arc leading channel (67); The upper arc guiding straight plate portion (615), the upper arc extinguishing straight plate portion (624), and the middle arc extinguishing straight plate portion (634) are arranged in parallel, and the upper arc guiding inclined plate portion (616), the upper arc extinguishing inclined plate portion (625), the middle arc extinguishing inclined plate portion (635), the lower arc extinguishing plate (641), and the lower arc guiding plate (651) are arranged in parallel; One ends of the upper arc guiding grid plate (61), the upper arc extinguishing grid plate (62), and the middle arc extinguishing grid plate (63) far from the moving contact (21) extend into the corresponding installation groove (11), and the upper arc guiding grid plate (61), the upper arc extinguishing grid plate (62), and the middle arc extinguishing grid plate (63) are higher than the corresponding incoming power connection screw (5).

2. The kV-class intelligent AC molded case circuit breaker according to claim 1, characterized in that: The arc extinguishing grid plates of each arc extinguishing chamber (6) extending into the installation groove (11) are higher than the incoming power connection screw (5).

3. The kV-class intelligent AC molded case circuit breaker according to claim 1, wherein: One ends of the upper arc guiding grid plate (61), the upper arc extinguishing grid plate (62), and the middle arc extinguishing grid plate (63) far from the moving contact (21) are on the same vertical line and are located inside the corresponding incoming power connection screw (5).

4. The kV-class intelligent AC molded case circuit breaker according to claim 1, wherein: Each arc extinguishing chamber further includes a metal arc baffle (7) located on the side of the lower arc extinguishing grid plates (64) away from the moving contact (21). The baffle (7) is located directly below the lowermost middle arc extinguishing straight plate portion (634), and there is an exhaust gap (100) between the top end of the baffle (7) and the bottom wall of this middle arc extinguishing straight plate portion (634).

5. The kV-class intelligent AC molded case circuit breaker according to claim 4, characterized in that: The top end of the baffle (7) is higher than the incoming power connection screw (5); each baffle (7) is provided with a mesh hole (71), and an insulating sealing plate (72) is provided on the outer side of each baffle (7).

6. The kV-class intelligent AC molded case circuit breaker according to claim 5, characterized in that: Each arc extinguishing chamber (6) further includes two gas generating columns (68); each gas generating column (68) includes a gas generating wall (681) located in the arc ignition channel (67). The surface of this gas generating wall (681) is a smooth surface, and a plurality of insertion slots (682) are provided on the other side wall body of each gas generating column (68) opposite to the gas generating wall (681). The ends of the plate bodies on both sides of the upper arc guiding notch (612) of the upper arc guiding inclined plate portion (616) form two upper arc guiding pins (617). The ends of the plate bodies on both sides of the upper arc extinguishing notch (622) of each upper arc extinguishing inclined plate portion (625) form two upper arc extinguishing pins (626). The ends of the plate bodies on both sides of the middle arc extinguishing notch (632) of each middle arc extinguishing inclined plate portion (635) form two middle arc extinguishing pins (636); the upper arc guiding pins (617), upper arc extinguishing pins (626), and lower arc extinguishing pins are inserted into the insertion slots (682) of a corresponding gas generating column (68).

7. The kV-class intelligent AC molded case circuit breaker according to claim 1, characterized in that: Each static contact (22) includes a power input plate (221), a power output plate (222), a static contact point (223), and a gas generating sleeve (224); the static contact point (223) is located in a corresponding arc ignition channel (67), and the gas generating sleeve (224) is located directly below a corresponding arc extinguishing chamber (6). The power input plate (221) and the power output plate (222) are flat plate-shaped. The power input plate (221) is provided with a power connection hole (2211) adapted to the incoming power connection screw (5). The power output plate (222) is provided with a U-shaped current limiting hole (2221), two current limiting conductive parts (2222) located on both sides of the U-shaped current limiting hole (2221), a diversion plate portion (2223) located on the side of the U-shaped current limiting hole (2221) away from the power input plate (221), and a static contact support portion (2224) surrounded by the U-shaped current limiting hole (2221). The static contact point (223) is arranged at the upper end of the static contact support portion (2224); the two current limiting conductive parts (2222) are connected to the power input plate (221), and the two current limiting conductive parts (2222), the diversion plate portion (2223), and the static contact support portion (2224) are connected; the gas generating sleeve (224) is sleeved on the power output plate (222), and a through hole (2241) is provided at the top end of the gas generating sleeve (224), and the static contact point (223) exposes this through hole (2241). Two circular current limiting through holes (2212) are further provided on the power input plate (221).

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