CN218568765U - Kilovolt-level intelligent alternating current plastic shell circuit breaker - Google Patents

Abstract

The invention discloses a kilovolt-level intelligent alternating-current molded case circuit breaker, which comprises a case, a contact mechanism, an arc extinguishing mechanism and a switching-on and switching-off operating mechanism, wherein the arc extinguishing mechanism comprises arc extinguishing chambers matched with static contacts; the shell is provided with a plurality of mounting grooves for mounting the power-in wiring screws, each power-in wiring screw is positioned at the bottom of a corresponding mounting groove, each mounting groove is communicated with a corresponding arc-extinguishing chamber, and at least part of arc-extinguishing grid pieces of each arc-extinguishing chamber extend into the corresponding mounting groove; each arc extinguish chamber comprises a plurality of grid pieces, two insulating clapboards, a metal arc baffle and an insulating sealing plate; an arc extinguishing channel is formed by clamping two grid sheets which are adjacent up and down; outlets of all arc extinguishing channels in each arc extinguishing chamber point to the metal arc baffle; the metal arc baffle and the insulating sealing plate are arranged in a corresponding mounting groove. The invention further improves the safety performance of the invention in a kilovolt alternating current circuit.

Description

Kilovolt-level intelligent alternating current plastic shell circuit breaker

Technical Field

The invention belongs to the technical field of air switches, and particularly relates to a kilovolt-level intelligent alternating-current molded case circuit breaker.

Background

The applicant filed an invention patent application of 'an intelligent alternating-current molded case circuit breaker with kilovolt level' earlier, and the technical scheme mainly solves the technical problem of how to increase the working voltage of the traditional low-voltage molded case circuit breaker to kilovolt level on the premise of not increasing the size.

In the technical scheme, the arc baffle is positioned right below one middle arc-extinguishing straight plate part at the bottom, and an exhaust gap is reserved between the top end of the arc baffle and the bottom wall of the middle arc-extinguishing straight plate part; the top end of the arc baffle is higher than the power-in wiring screw. The structure can prevent residual arc from blowing to the power-in wiring screw, but because the residual arc is positioned right below the middle arc-extinguishing straight plate part at the lowest part, the residual arc can still be blown out from the upper part of the arc-extinguishing chamber, and a certain influence is exerted on the outside early.

Disclosure of Invention

The invention aims to provide a kilovolt-level intelligent alternating-current molded case circuit breaker which prevents residual arcs from escaping from an arc extinguish chamber to the outside.

The technical scheme for realizing the purpose of the invention is as follows: a kilovolt-level intelligent alternating-current molded case circuit breaker comprises a shell, a contact mechanism, an arc extinguishing mechanism and a switching-on and switching-off operating mechanism, wherein the contact mechanism comprises a plurality of groups of moving contacts and fixed contacts; the arc extinguishing mechanism comprises arc extinguishing chambers matched with the static contacts; the shell is provided with a plurality of mounting grooves for mounting the power-in wiring screws, each power-in wiring screw is positioned at the bottom of a corresponding mounting groove, each mounting groove is communicated with a corresponding arc-extinguishing chamber, and at least part of arc-extinguishing grid pieces of each arc-extinguishing chamber extend into the corresponding mounting groove; each arc extinguish chamber comprises a plurality of grid pieces, two insulating clapboards, a metal arc baffle and an insulating sealing plate; an arc extinguishing channel is formed between two grid sheets which are adjacent up and down in a clamping manner, and the outlets of all the arc extinguishing channels of each arc extinguishing chamber are positioned in a corresponding mounting groove and point to the metal arc baffle; the metal arc baffle and the insulating sealing plate are arranged in one corresponding mounting groove, and the insulating sealing plate is positioned on one side, far away from the grid piece, of the metal arc baffle.

Preferably, the metal arc baffle is a mesh plate provided with a plurality of through holes.

Preferably, the metal arc baffle and the insulating seal plate are each stepped in shape as viewed from the side.

Preferably, the metal arc baffle plate and the insulating seal plate are both linear in shape when viewed from the side.

Preferably, an exhaust gap is arranged between the metal arc baffle plate and the insulating sealing plate.

The invention has the positive effects that: according to the invention, the metal arc baffle and the insulating sealing plate are arranged in the mounting groove, residual arcs escaping from outlets of the arc extinguishing channels are completely extinguished by the metal arc baffle, and high-temperature gas generated by the arc extinguishing chamber is prevented from being directly blown into the mounting groove by the insulating sealing plate, so that the residual arcs are effectively prevented from escaping from the arc extinguishing chamber to the outside, and the safety performance of the invention in a kilovolt alternating current circuit is further improved.

Drawings

FIG. 1 is a schematic perspective view of the present invention;

fig. 2 is a cross-sectional view of the intelligent ac molded case circuit breaker of fig. 1;

fig. 3 is a schematic perspective view of a three-dimensional structure of the intelligent ac molded case circuit breaker shown in fig. 1, in which an arc extinguishing chamber and a stationary contact are engaged;

fig. 4 is a schematic perspective view of a gas generating column of the intelligent ac molded case circuit breaker shown in fig. 1;

FIG. 5 is a schematic perspective view of another embodiment of the gas column of FIG. 4;

FIG. 6 is a schematic view of a half-section of the gas production column of FIG. 4;

fig. 7 is a schematic perspective view of an upper conductive arc fence of the intelligent ac molded case circuit breaker shown in fig. 1;

fig. 8 is a front view of the upper conductive arc grid of fig. 7;

FIG. 9 is a schematic view of a half-section of the upper conductive arc grid of FIG. 7;

fig. 10 is a schematic perspective view of an upper arc chute of the intelligent ac molded case circuit breaker shown in fig. 1;

fig. 11 is a front view of the upper arc chute of fig. 10;

fig. 12 is a schematic view of a half-section of the upper arc chute of fig. 10;

fig. 13 is a schematic perspective view of an arc chute in the intelligent ac molded case circuit breaker shown in fig. 1;

fig. 14 is a front view of the arc chute shown in fig. 13;

fig. 15 is a schematic half-sectional view of the arc chute shown in fig. 13;

fig. 16 is a schematic perspective view of a lower arc chute of the intelligent ac molded case circuit breaker shown in fig. 1;

fig. 17 is a front view of the lower arc chute of fig. 16;

fig. 18 is a schematic view of a half-section of the lower arc chute of fig. 16;

fig. 19 is a schematic perspective view of a lower arc guiding grid in the intelligent ac molded case circuit breaker shown in bitmap 1;

fig. 20 is a front view of the lower arc chute of fig. 19;

fig. 21 is a schematic view of a half-section of the lower arc chute of fig. 19;

fig. 22 is a schematic perspective view of another embodiment of the present invention.

The figures are shown with the reference numbers: the device comprises a shell 1, a mounting groove 11, a contact mechanism 2, a movable contact 21, a static contact 22, an arc extinguishing mechanism 3, a switching-on and switching-off operating mechanism 4, an incoming wiring screw 5, an arc extinguishing chamber 6, an upper arc guiding grid sheet 61, an upper arc guiding plate 611, an upper arc guiding notch 612, an upper arc guiding folded plate 613, an upper arc guiding insertion boss 614, an upper arc guiding straight plate portion 615, an upper arc guiding inclined plate portion 616, an upper arc guiding pin 617, an upper arc extinguishing grid sheet 62, an upper arc extinguishing plate 621, an upper arc extinguishing notch 622, an upper arc extinguishing insertion boss 623, an upper arc extinguishing straight plate portion 624, an upper arc extinguishing inclined plate portion 625, an upper arc extinguishing pin 626, the arc-extinguishing grid 63, the middle arc-extinguishing plate 631, the middle arc-extinguishing gap 632, the middle arc-extinguishing insertion boss 633, the middle arc-extinguishing straight plate 634, the middle arc-extinguishing inclined plate 635, the middle arc-extinguishing pin 636, the lower arc-extinguishing grid 64, the lower arc-extinguishing plate 641, the lower arc-extinguishing gap 642, the lower arc-extinguishing insertion boss 643, the lower arc-guiding grid 65, the lower arc-guiding plate 651, the lower arc-guiding gap 652, the lower arc-guiding folded plate 653, the lower arc-guiding insertion boss 654, the insulating partition plate 66, the arc-striking channel 67, the gas-generating column 68, the gas-generating wall 681, the insertion groove 682, the arc-blocking plate 71 and the insulating sealing plate 72.

Detailed Description

(example 1)

The embodiment is an intelligent kilovolt-level alternating-current molded case circuit breaker, as shown in fig. 1 to 3, and includes a case 1, a contact mechanism 2, an arc extinguishing mechanism 3, and a switching-on/off operating mechanism 4, where the contact mechanism 2 includes multiple sets of moving contacts 21 and fixed contacts 22, the case 1 is provided with multiple incoming-current wiring screws 5, and each incoming-current wiring screw 5 is electrically connected with a corresponding fixed contact 22; the arc extinguishing mechanism 3 comprises an arc extinguishing chamber 6 matched with each static contact 22; the shell 1 is provided with three mounting grooves 11 for mounting the electric wiring screws 5, each electric wiring screw 5 is positioned 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 arc-extinguishing grid pieces of each arc-extinguishing chamber 6 extend out of the corresponding mounting groove 11.

Traditional moulded case circuit breaker also is equipped with the mounting groove 11 that is used for installing into electric binding screw 5, but the arc extinguishing bars piece of each explosion chamber can not stretch out to this mounting groove in, so the size and the arc extinguishing ability of traditional explosion chamber just receive its self volume occupation space's restriction, this embodiment is through stretching out to the mounting groove 11 to partial arc extinguishing bars piece design, just can break this restriction, effectively strengthens its arc extinguishing effect, satisfies the arc extinguishing requirement when kilovolt level alternating current divides the floodgate.

As shown in fig. 3 to 21, each arc extinguishing chamber 6 includes a plurality of grid pieces, two insulating partition plates 66, one metal arc baffle 71 and one insulating sealing plate 72; an arc extinguishing channel is formed between two grid pieces which are adjacent up and down in a clamping manner, and the outlets of all the arc extinguishing channels of each arc extinguishing chamber are positioned in a corresponding mounting groove and point to the metal arc baffle 71, so that residual arcs flying out of the outlets of all the arc extinguishing channels are blown to the metal arc baffle 71; a metal arc baffle 71 and an insulating sealing plate 72 are disposed in a corresponding one of the mounting grooves 11, and the insulating sealing plate 72 is located on a side of the metal arc baffle 71 remote from the grid.

The metal arc baffle 71 is a mesh plate provided with a plurality of through holes, and the metal arc baffle essentially becomes a zero arc plate, so that residual arcs escaping from the arc extinguish chamber can be completely extinguished; an exhaust gap is arranged between the metal arc baffle plate 71 and the insulating sealing plate 72, and the insulating sealing plate 72 is used for preventing high-temperature gas generated during arc extinction from directly blowing into the mounting groove 11.

In this embodiment, the shapes of the metal arc baffle 71 and the insulating seal plate 72 are both stepped in side view.

In this embodiment, the plurality of grid plates are sequentially arranged up and down, and both ends of the plurality of grid plates are fixedly arranged on the insulating partition plate 66 to form an integral piece; one end of each grid piece close to the movable contact 21 is provided with a notch; the gaps of a plurality of grid pieces in each arc extinguish chamber 6 are combined to form an arc striking channel 67 which is communicated up and down; the moving contacts 21 are provided with moving contacts, and the moving contacts of each moving contact 21 are always in the arc striking channel 67 of a corresponding arc extinguishing chamber 6 in the switching-on and switching-off process; an arc extinguishing channel is formed by clamping two grid sheets which are adjacent up and down, and each arc extinguishing channel is communicated with a corresponding mounting groove 11; the tail ends of the plurality of grid pieces at the upper end of each arc extinguishing chamber 6 extend into the mounting groove 11. The structure is reasonable and compact, so that in the brake-separating process, the moving contact is positioned in the arc-striking channel 67 in the whole process, namely is semi-surrounded by the arc-extinguishing chamber, and the arc-extinguishing effect in the brake-separating process is ensured.

Each arc extinguish chamber 6 comprises an upper arc guide grid sheet 61, six upper arc extinguish grid sheets 62, two middle arc extinguish grid sheets 63, two lower arc extinguish grid sheets 64, a lower arc guide grid sheet 65 and two insulating partition plates 66; the upper arc guide grid sheet 61, the upper arc extinguishing grid sheet 62, the middle arc extinguishing grid sheet 63, the lower arc extinguishing grid sheet 64 and the lower arc guide grid sheet 65 are sequentially arranged along the direction from top to bottom.

As shown in fig. 7 to 9, the upper arc guiding grid 61 includes an upper arc guiding plate 611, an upper arc guiding notch 612 disposed at the edge of the upper arc guiding plate 611, an upper arc guiding folded plate 613 disposed in the upper arc guiding notch 612, and upper arc guiding insertion bosses 614 disposed at two side ends of the upper arc guiding plate 611; the upper arc guiding plate 611 comprises an upper arc guiding straight plate part 615 arranged horizontally and an upper arc guiding inclined plate part 616 arranged obliquely downwards; the upper arc guide folded plate 613 is higher than the upper arc guide sloping plate part 616; the upper arc guiding notch 612 is positioned on the upper arc guiding inclined plate part 616; one end of the upper arc guiding flap 613 is connected to the upper arc guiding inclined plate 616, and the other end of the upper arc guiding flap 613 extends obliquely upward in a direction away from the upper arc guiding straight plate 615.

As shown in fig. 10 to 12, each upper arc-extinguishing grid 62 includes an upper arc-extinguishing plate 621, an upper arc-extinguishing notch 622 disposed at the edge of the upper arc-extinguishing plate 621, and upper arc-extinguishing insertion bosses 623 disposed at two side ends of the upper arc-extinguishing plate 621; the upper arc-extinguishing plate 621 comprises an upper arc-extinguishing straight plate portion 624 arranged horizontally and an upper arc-extinguishing inclined plate portion 625 arranged obliquely downwards; the upper arc chute 622 is located on the upper arc chute portion 625.

As shown in fig. 13 to fig. 15, each of the arc chute plates 63 includes a middle arc plate 631, a middle arc notch 632 disposed at an edge of the middle arc plate 631, and middle arc insertion bosses 633 disposed at two side ends of the middle arc plate 631; the middle arc plate 631 comprises a middle arc-extinguishing straight plate part 634 arranged horizontally and a middle arc-extinguishing inclined plate part 635 arranged obliquely downwards; the center arc-extinguishing gap 632 is located on the center arc-extinguishing ramp portion 635.

The tail end of the upper arc guiding plate 611, the tail end of the upper arc extinguishing plate 621 and the tail end of the middle arc extinguishing plate 631 of each arc extinguishing chamber extend into a corresponding one of the mounting grooves 11, and the tail end of the upper arc guiding plate 611, the tail end of the upper arc extinguishing plate 621 and the tail end of the middle arc extinguishing plate 631 of each arc extinguishing chamber are flush with each other along the direction of the plumb line.

As shown in fig. 16 to 18, each of the lower arc-extinguishing grid pieces 64 includes a lower arc-extinguishing plate 641, a lower arc-extinguishing notch 642 disposed at an edge of the lower arc-extinguishing plate 641, and lower arc-extinguishing insertion bosses 643 disposed at both side ends of the lower arc-extinguishing plate 641.

As shown in fig. 19 to 21, the lower arc guiding grid 65 includes a lower arc guiding plate 651, a lower arc guiding notch 652 arranged at the edge of the lower arc guiding plate 651, a lower arc guiding folded plate 653 arranged in the lower arc guiding notch 652, and lower arc guiding insertion bosses 654 arranged at both side ends of the lower arc guiding plate 651; the lower arc guiding flap 653 is lower than the lower arc guiding plate 651, and the position of the lower arc guiding flap 653 ensures better guidance of the arc below into the arc chute.

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 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 are enclosed to form the arc striking channel 67; the upper arc guide 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 guide 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-guide plate 651 are arranged in parallel; the ends of the upper arc guiding grid sheet 61, the upper arc extinguishing grid sheet 62 and the middle arc extinguishing grid sheet 63, which are far away from the moving contact 21, extend into the corresponding mounting groove 11, and the upper arc guiding grid sheet 61, the upper arc extinguishing grid sheet 62 and the middle arc extinguishing grid sheet 63 are higher than the corresponding power-in wiring screws 5.

The ends of the upper arc-guiding grid sheet 61, the upper arc-extinguishing grid sheet 62 and the middle arc-extinguishing grid sheet 63, which are far away from the movable contact 21, are on the same vertical line and are positioned at the inner side of a corresponding power-in wiring screw 5. The structure can prevent the ends of the upper arc-guiding grid sheet 61, the upper arc-extinguishing grid sheet 62 and the middle arc-extinguishing grid sheet 63 which are far away from the movable contact 21 from influencing the electricity-connecting fastening installation operation of the electricity-inlet wiring screw.

The upper arc guiding flap 613 and the lower arc guiding flap 653 are clamped to form a tapered shape for guiding the arc into the arc chute.

As shown in fig. 4 to 6, each arc extinguishing chamber 6 further comprises two gas generating columns 68; each gas generating column 68 comprises a gas generating wall 681 positioned in the arc ignition channel 67, the surface of the gas generating wall 681 is a smooth surface, and a plurality of insertion grooves 682 are formed 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 of the upper arc guiding inclined plate part 616 at the two sides of the upper arc guiding notch 612 form two upper arc guiding pins 617, the ends of the plate bodies of the upper arc extinguishing inclined plate parts 625 at the two sides of the upper arc extinguishing notch 622 form two upper arc extinguishing pins 626, and the ends of the plate bodies of the middle arc extinguishing inclined plate part 635 at the two sides of the middle arc extinguishing notch 632 form two middle arc extinguishing pins 636; the upper arc guide pin 617, the upper arc extinguishing pin 626 and the lower arc extinguishing pin are inserted into the insertion groove 682 of a corresponding gas generating column 68.

The gas generating columns not only enhance the stability of each arc extinguishing grid piece, but also because the gas generating columns are made of gas generating materials, when electric arcs are generated, partial surface substances of the gas generating walls 681 are gasified to form local high air pressure, so that the arc extinguishing columns are favorable for quickly blowing the electric arcs into the arc extinguishing chambers, and the arc extinguishing speed is effectively increased.

(example 2)

The present embodiment is a kilovolt intelligent ac molded case circuit breaker with another structure, which is basically the same as embodiment 1, except that: as shown in fig. 22, the metal arc baffle 71 and the insulating seal plate 72 are both linear in shape when viewed from the side.

In this embodiment, the lower arc-extinguishing grid 64 and the lower arc-guiding grid 65 used in embodiment 1 may be adopted, or the lower arc-extinguishing plate 641 and the lower arc-guiding plate 651 may be respectively extended to be close to the arc-blocking plate 71, so as to obtain better arc-extinguishing performance.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims (5)

1. A kilovolt-level intelligent alternating-current molded case circuit breaker comprises a case (1), a contact mechanism (2), an arc extinguishing mechanism (3) and a switching-on and switching-off operating mechanism (4), wherein the contact mechanism (2) comprises a plurality of groups of moving contacts (21) and fixed contacts (22), a plurality of power-in wiring screws (5) are arranged on the case (1), and each power-in wiring screw (5) is electrically connected with one corresponding fixed contact (22); the arc extinguishing mechanism (3) comprises arc extinguishing chambers (6) matched with the static contacts (22); the method is characterized in that:

the shell (1) is provided with a plurality of mounting grooves (11) for mounting the power-in wiring screws (5), each power-in wiring screw (5) is positioned 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 arc-extinguishing grid pieces of each arc-extinguishing chamber (6) extend into the corresponding mounting groove (11); each arc extinguish chamber (6) comprises a plurality of grid pieces, two insulating partition plates (66), a metal arc baffle plate (71) and an insulating sealing plate (72); an arc extinguishing channel is formed between two grid sheets which are adjacent up and down in a clamping manner, and the outlets of all the arc extinguishing channels of each arc extinguishing chamber are positioned in a corresponding mounting groove and point to the metal arc baffle (71); the metal arc baffle plate (71) and the insulating sealing plate (72) are arranged in one corresponding mounting groove (11), and the insulating sealing plate (72) is positioned on one side, far away from the grid piece, of the metal arc baffle plate (71).

2. The kilovolt-level intelligent ac molded case circuit breaker according to claim 1, wherein: the metal arc baffle plate (71) is a mesh plate provided with a plurality of through holes.

3. The kilovolt-level intelligent ac molded case circuit breaker according to claim 2, wherein: the shapes of the metal arc baffle plate (71) and the insulating sealing plate (72) are step-shaped when viewed from the side.

4. The kilovolt-level intelligent ac molded case circuit breaker according to claim 2, wherein: the metal arc baffle plate (71) and the insulating sealing plate (72) are both linear in shape when viewed from the side.

5. The kilovolt-level intelligent ac molded case circuit breaker according to claim 2, wherein: an exhaust gap is arranged between the metal arc baffle plate (71) and the insulating sealing plate (72).

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