CN210778328U - Arc extinguish chamber structure of high-voltage direct-current plastic shell type circuit breaker - Google Patents

Abstract

The arc extinguishing chamber structure of the high-voltage direct-current circuit breaker comprises a plurality of arc extinguishing grid pieces arranged at intervals, arc separating plates arranged on two sides of the arc extinguishing grid pieces and an arc extinguishing cover, wherein arc leading grooves are formed in the arc extinguishing grid pieces, the arc extinguishing chamber comprises an arc inlet side and an arc outlet side, the arc extinguishing grid pieces comprise special main grid pieces, main grid pieces and secondary grid pieces, the first to fourth arc extinguishing grid pieces are special main grid pieces from one side relatively close to a static contact, the fifth to fourteenth arc extinguishing grid pieces are main grid pieces, the rest are secondary grid pieces, the special main grid pieces are 1.2-2 mm thick, narrowing extension ends are arranged on the special main grid pieces and the main grid pieces, the narrowing extension ends are provided with end portions of the grid pieces opposite to the gas outlet side, and the width of the narrowing extension ends is smaller than the width of the grid pieces. Through the combination and matching of the grid pieces with different specifications, the arc extinguishing grid pieces can be used for dealing with each stage of arc extinguishing, so that the arc burning resistance, the cooling performance, the high temperature resistance and the high temperature deformation resistance of the arc extinguishing grid pieces are enhanced.

Description

Arc extinguish chamber structure of high-voltage direct-current plastic shell type circuit breaker

Technical Field

The utility model relates to a high-pressure plastic shell formula direct current circuit breaker field, especially a high-voltage plastic shell formula direct current circuit breaker's explosion chamber structure.

Background

At present, a DC (direct current) 1000V circuit breaker for a large centralized grid-connected power station is developing to a DC1500V circuit breaker, and the rated working voltage of a corresponding photovoltaic direct current circuit breaker is continuously increased from DC500V and 750V to DC1000 and 1500V;

in order to reduce the cost, the volume does not rise and fall reversely, the performance technical index does not fall and rise reversely, and the reliability and performance requirements on the circuit breaker are higher and higher under the condition.

The existing plastic-shell type direct current circuit breaker of DC1500V has many problems in breaking, for example, in an arc extinguishing system, the arc energy cannot be automatically attenuated because the direct current has no natural zero crossing. After the arc is generated in the arc gap, if the direct current arc extinguishing condition is not satisfied, the arc is not extinguished, and in fact, even if the extinguishing condition is satisfied, the arc is not extinguished immediately, but only tends to be extinguished. That is, it takes a certain time for the dc arc to extinguish.

The main reasons are as follows:

a. the circuit has an inductor, the inductor L is larger, the more energy is stored, the more energy is required to be emitted from an arc gap for arc extinguishing, half of the energy stored in the inductor is released synchronously with the arc in a thermal energy form, and the other half of the energy lags behind the voltage by electromagnetic energy, so that the arc is more difficult to extinguish and the time constant T has obvious influence on the opening and closing of the direct-current circuit;

b. the arc column has thermal inertia, and because the discharge of energy in the arc takes a certain time, the arc cannot be extinguished immediately, and the arc must be extinguished after the discharge of energy in the arc is completed or basically completed.

One of the main techniques for high voltage dc arc extinction is the final length of the grid and the volume (heat capacity) of the grid in the arc chute to ensure complete and reliable extinction of the arc in the arc chute.

The problem that current explosion chamber structure exists is: high overvoltage generated in the process of breaking DC arc

As can be seen from the formula, the larger the inductance, the larger the time constant

The larger the arc quenching difficulty. In the process of breaking the direct current, the direct current to be broken often has a very high peak value (the peak current of 2 times of a rated value is generated by the inductor in the fault), and it is determined that the whole direct current system stores huge energy to be released in the process of breaking. The huge energy during the on-off process can easily cause that the arc extinguish chamber with the common specification can not effectively dissipate the energy, and the direct current plastic shell type circuit breaker on the market at present has insufficient arc extinguish and can not completely extinguish the electric arc in the arc extinguish chamber, thus easily causing the re-burning of the electric arc or the re-conduction of the power electronic device of the breaking branch circuit and causing the breaking failure of the direct current.

Disclosure of Invention

The utility model discloses a solve the not enough of above-mentioned technique, provide a high voltage direct current breaker's explosion chamber structure. The technical scheme of the utility model: the utility model provides an explosion chamber structure of high voltage direct current circuit breaker, includes the arc extinguishing bars piece that a plurality of intervals set up, sets up in the flash barrier and the arc extinguishing chamber of arc extinguishing bars piece both sides, be equipped with the arc chute on the arc extinguishing bars piece, the explosion chamber is including advancing arc side and gas outlet side, its characterized in that: the arc extinguishing bars comprise special main bars, main bars and secondary bars, wherein the first to fourth bars are special main bars, the fifth to fourteenth bars are main bars, and the rest are secondary bars from one side relatively close to the static contact, the thickness of the special main bars is 1.2 to 2 mm, the special main bars and the main bars are provided with narrowing extension ends, the narrowing extension ends are provided with end parts of the bars opposite to the gas outlet side, and the width of the narrowing extension ends is smaller than the width of the bars.

By adopting the technical scheme, the moving contact and the fixed contact of the circuit breaker are separated to generate electric arcs, and the electric arcs continuously burn under the action of heat flow separation. Because the energy at the disconnection position is huge, the electric arc is most concentrated, a plurality of arc-extinguishing grid pieces close to the static contact are easily burnt, the grid pieces are burnt, and the like, and the arc-extinguishing grid pieces corresponding to the static contact are thickened, so that the arc-extinguishing grid pieces of the layers are enhanced in arc burning resistance, cooling performance, high-temperature resistance and high-temperature deformation resistance.

The range of the moving contact and the static contact which are just separated is the first interval, and the grid plates which are easy to burn are the first type arc-extinguishing grid plates in the first interval, so the thickness, the length and the width of the first type arc-extinguishing grid plates are enhanced to avoid the grid plate burning problem.

And the narrowing extension end is additionally arranged, so that the length of the striking arc of the grid piece is extended, the arc is extended, the rapid extinguishing of the arc is facilitated, meanwhile, the width of the narrowing extension end is reduced relative to the total width of the grid piece, the installation of an arc extinguish chamber is facilitated, and the occupied space is reduced as much as possible.

The utility model discloses a further setting: in the special main grid plates, the first grid plate relatively close to one side of the static contact is a special type grid plate, the second grid plate is a special type grid plate, and the third to fourth grid plates are special type grid plates;

the special type grid plate is 1.2 to 1.8 mm in thickness, 30 to 40 mm in total width and 42 to 55 mm in total length, a narrowing extension end which is 22 to 32 mm in width and 7 to 22 mm in length is arranged, and the narrowing extension end and the grid plate are in chamfer transition;

the thickness of the special second type grid is 1.2-2 mm, the total width is 30-40 mm, the total length is 50-65 mm, a narrowing extension end with the width of 22-32 mm and the length of 7-22 mm is arranged, and the narrowing extension end and the grid are in chamfer transition;

the thickness of the special three types of grid plates is 1.2-2 mm, the total width is 30-40 mm, the total length is 50-65 mm, a narrowing extension end with the width of 22-32 mm and the length of 7-22 mm is arranged, and the narrowing extension end and the grid plates are in chamfer transition.

The utility model discloses a further setting: the arc striking grooves of the special main grid pieces comprise wide groove ends and narrow groove ends;

the width of the wide groove end of the special type grid plate is 18.5 mm, the length of the wide groove end of the special type grid plate is 9.5 mm, the width of the narrow groove end of the special type grid plate is 14.5 mm, the length of the narrow groove end of the special type grid plate is 7-8.5 mm, the narrow groove end and the wide groove end of the special type grid plate are in chamfer transition, and the groove bottom of the narrow groove end is arranged in a bevel edge mode;

the width of the wide groove end of the special second type grid plate is 18.5 mm, the length of the wide groove end of the special second type grid plate is 12 mm, the width of the narrow groove end of the special second type grid plate is 14.5 mm, the length of the narrow groove end of the special second type grid plate is 10.5-16 mm, the narrow groove end and the wide groove end of the special second type grid plate are in arc transition, and the groove bottom of the narrow groove end is arranged in a;

the width of the wide groove end of the special three-type grid plate is 18.5 mm, the length of the wide groove end of the special three-type grid plate is 7 mm, the width of the narrow groove end of the special three-type grid plate is 14.5 mm, the length of the narrow groove end of the special three-type grid plate is 17-22 mm, the narrow groove end and the wide groove end of the special three-type grid plate are in arc transition, and the groove bottom of the narrow groove.

The utility model discloses a further setting: the special type grid plate is 1.5 mm in thickness, 34 mm in total width, 48.5 mm in total length, and provided with a narrowed extension end with the width of 26.5 mm and the length of 16.25 mm;

the thickness of the special second type grid is 1.5 mm, the total width is 34 mm, the total length is 60.5 mm, and a narrowing extension end with the width of 26.5 mm and the length of 21.25 mm is arranged;

the thickness of the special three types of grid pieces is 1.5 mm, the total width is 34 mm, the total length is 61 mm, and a narrowing extension end with the width of 26.5 mm and the length of 21.75 mm is arranged;

the utility model discloses a further setting: in the main grid pieces, the fifth to tenth grid pieces which are relatively close to one side of the static contact are main first-class grid pieces, and the eleventh to fourteenth grid pieces are main second-class grid pieces;

the thickness of the first-class grid sheet is 1 mm, the total width is 34 mm, the total length is 59 mm, a narrowing extension end with the width of 26.5 mm and the length of 22.75 mm is arranged, the width of an arc striking groove of the first-class grid sheet is 14.5 mm, the length of the arc striking groove is 24-26 mm, and the bottom of the arc striking groove is arranged in a bevel edge manner;

the thickness of the main second-class grid is 1 mm, the total width is 34 mm, the total length is 59.5 mm, a narrowing extension end with the width of 26.5 mm and the length of 22.75 mm is arranged, the width of an arc striking groove of the main second-class grid is 14.5 mm, the length of the arc striking groove is 19.5-24.5 mm, and the bottom of the arc striking groove is arranged in a bevel edge mode.

The utility model discloses a further setting: among the secondary grid pieces, the fifteenth to eighteenth grid pieces relatively close to one side of the static contact are secondary grid pieces, the nineteenth grid pieces are secondary second grid pieces, the twenty-fifth grid pieces are secondary third grid pieces, and the twenty-fourth grid pieces are secondary fourth grid pieces;

the thickness of the second-class grid is 1 mm, the total width is 34 mm, the total length is 42 mm, the width of an arc striking groove of the second-class grid is 14.5 mm, the length is 15.5-20.5 mm, and the bottom of the arc striking groove is arranged in a bevel edge manner;

the thickness of the secondary type grid plate is 1 mm, the total width is 34 mm, the total length is 36 mm, the width of an arc striking groove of the secondary type grid plate is 14.5 mm, the length is 14.5-16.5 mm, and the bottom of the arc striking groove is arranged in a bevel edge manner;

the thickness of the third-class grid plate is 1 mm, the total width is 34 mm, the total length is 28 mm, the width of an arc striking groove of the third-class grid plate is 14.5 mm, the length is 11.5-16.5 mm, and the bottom of the arc striking groove is arranged in a bevel edge manner;

the thickness of four kind bars of time is 1 millimeter, and total width is 34 millimeters, and the total length is 21.5 millimeters, and the tip that should four kind bars of time relative gas outlet side is equipped with a width 16 to 17 millimeters, the bellying of length 1.5 millimeters, the striking groove width of four kind bars of time is 12 millimeters, and length is 12.3 millimeters, and this striking groove tank bottom is equipped with the striking angle.

The utility model discloses a further setting: the number of the grid pieces of the arc extinguish chamber is 21.

Drawings

Fig. 1 is a structural diagram of an arc extinguish chamber in an embodiment of the invention;

fig. 2 is an explosion diagram of an arc extinguishing chamber according to an embodiment of the present invention;

fig. 3 is a structural diagram of a special type grid sheet according to an embodiment of the present invention;

fig. 4 is a structural diagram of a special second type grid sheet of the embodiment of the present invention;

fig. 5 is a structural diagram of a special three-type grid sheet according to an embodiment of the present invention;

fig. 6 is a structure diagram of a primary grid sheet of the embodiment of the present invention;

fig. 7 is a structure diagram of a primary grid sheet of the embodiment of the present invention;

fig. 8 is a diagram illustrating a next-class grid structure according to an embodiment of the present invention;

fig. 9 is a view of the structure of the second-class grid plate according to the embodiment of the present invention;

fig. 10 is a view of the structure of the second three types of grid sheets according to the embodiment of the present invention;

fig. 11 is a diagram of a next four types of grid structure according to an embodiment of the present invention.

Detailed Description

As shown in fig. 1-11, an arc extinguishing chamber structure of a high voltage dc circuit breaker includes a plurality of arc extinguishing bars arranged at intervals, an arc barrier 1 and an arc extinguishing cover 2, the arc extinguishing bars are provided with arc guiding grooves 3, the arc extinguishing chamber includes an arc inlet side 11 and an arc outlet side 12, the arc extinguishing bars include special main bars, main bars and secondary bars, from one side relatively close to a fixed contact, the first to fourth bars are the special main bars, the fifth to fourteenth bars are the main bars, the rest are the secondary bars, the special main bars have a thickness of 1.2 to 2 mm, the special main bars and the main bars are provided with narrowing extension ends 4, the narrowing extension ends 4 are provided with ends of the bars opposite to the air outlet side 12, and the widths of the bars are smaller than the widths of the bars.

The moving and static contacts of the circuit breaker are separated to generate electric arcs, and the electric arcs continuously burn under the action of heat flow separation. Because the energy at the disconnection position is huge, the electric arc is most concentrated, a plurality of arc-extinguishing grid pieces close to the static contact are easily burnt, the grid pieces are burnt, and the like, and the arc-extinguishing grid pieces corresponding to the static contact are thickened, so that the arc-extinguishing grid pieces of the layers are enhanced in arc burning resistance, cooling performance, high-temperature resistance and high-temperature deformation resistance.

The range of the moving contact and the static contact which are just separated is the first interval, and the grid plates which are easy to burn are the first type arc-extinguishing grid plates in the first interval, so the thickness, the length and the width of the first type arc-extinguishing grid plates are enhanced to avoid the grid plate burning problem.

And the narrowing extension end 4 is additionally arranged, so that the length of the striking arc of the grid piece is extended, the arc is elongated, the arc is extinguished quickly, meanwhile, the width of the narrowing extension end 4 is reduced relative to the total width of the grid piece, the installation of an arc extinguish chamber is facilitated, and the occupied space is reduced as much as possible.

The utility model discloses a further setting: among the special main grid pieces, the first grid piece relatively close to one side of the static contact is a special type grid piece 51, the second grid piece is a special type grid piece 52, and the third to fourth grid pieces are special type grid pieces 53;

the special type grid plate 51 has the thickness of 1.2 to 1.8 mm, the total width of 30 to 40 mm and the total length of 42 to 55 mm, and is provided with a narrowed extension end 4 with the width of 22 to 32 mm and the length of 7 to 22 mm, and the narrowed extension end 4 is in transition with the grid plate through a chamfer 41;

the special second type grid plate 52 is 1.2 to 2 mm in thickness, 30 to 40 mm in total width, 50 to 65 mm in total length, is provided with a narrowed extension end 4 which is 22 to 32 mm in width and 7 to 22 mm in length, and the narrowed extension end 4 is in transition with the grid plate through a chamfer 41;

the special three types of grid plates 53 have the thickness of 1.2 to 2 mm, the total width of 30 to 40 mm and the total length of 50 to 65 mm, and are provided with a narrowed extension end 4 with the width of 22 to 32 mm and the length of 7 to 22 mm, and the narrowed extension end 4 is in transition with the grid plates through a chamfer 41.

The arc striking grooves 3 of the special main grid plates comprise wide groove ends 31 and narrow groove ends 32;

the width of the wide groove end 31 of the special-type grid plate 51 is 18.5 mm, the length of the wide groove end 31 is 9.5 mm, the width of the narrow groove end 32 is 14.5 mm, the length of the narrow groove end is 7-8.5 mm, the narrow groove end 32 and the wide groove end 31 are in transition through a chamfer 41, and the bottom of the narrow groove end 32 is arranged in a bevel edge 33 manner;

the width of the wide groove end 31 of the special second-type grid plate 52 is 18.5 mm, the length of the wide groove end 31 is 12 mm, the width of the narrow groove end 32 is 14.5 mm, the length of the narrow groove end is 10.5-16 mm, the narrow groove end 32 and the wide groove end 31 are in arc transition, and the bottom of the narrow groove end 32 is arranged in a bevel edge 33;

the width of the wide groove end 31 of the special three-type grid piece 53 is 18.5 mm, the length of the wide groove end 31 is 7 mm, the width of the narrow groove end 32 is 14.5 mm, the length of the narrow groove end is 17-22 mm, the narrow groove end 32 and the wide groove end 31 are in arc transition, and the groove bottom of the narrow groove end 32 is arranged in a bevel edge 33 mode.

The special type grid plate 51 is 1.5 mm thick, 34 mm in total width, 48.5 mm in total length, and is provided with a narrowed extension end 4 with the width of 26.5 mm and the length of 16.25 mm;

the special second type grid piece 52 is 1.5 mm thick, 34 mm in total width, 60.5 mm in total length, and is provided with a narrowed extension end 4 with the width of 26.5 mm and the length of 21.25 mm;

the thickness of the special three-type grid piece 53 is 1.5 mm, the total width is 34 mm, the total length is 61 mm, and a narrowed extension end 4 with the width of 26.5 mm and the length of 21.75 mm is arranged;

in the main grid pieces, the fifth to tenth grid pieces relatively close to one side of the static contact are main first-class grid pieces 54, and the eleventh to fourteenth grid pieces are main second-class grid pieces 55;

the thickness of the first-class grid 54 is 1 mm, the total width is 34 mm, the total length is 59 mm, a narrowing extension end 4 with the width of 26.5 mm and the length of 22.75 mm is arranged, the width of the arc striking groove 3 of the first-class grid 54 is 14.5 mm, the length of the arc striking groove is 24-26 mm, and the groove bottom of the arc striking groove 3 is arranged in a bevel edge 33;

the thickness of the main second-type grid sheet 55 is 1 mm, the total width is 34 mm, the total length is 59.5 mm, a narrowing extension end 4 with the width of 26.5 mm and the length of 22.75 mm is arranged, the width of the arc striking groove 3 of the main second-type grid sheet 55 is 14.5 mm, the length of the arc striking groove is 19.5-24.5 mm, and the bottom of the arc striking groove 3 is arranged in a bevel edge 33.

Among the secondary grid plates, the fifteenth to eighteenth grid plates relatively close to one side of the static contact are a secondary first-class grid plate 56, the nineteenth grid plate is a secondary second-class grid plate 57, the twentieth grid plate is a secondary third-class grid plate 58 and the twentieth grid plate is a secondary fourth-class grid plate 59;

the thickness of the second-class grid plate 56 is 1 mm, the total width is 34 mm, the total length is 42 mm, the width of the arc striking groove 3 of the second-class grid plate 56 is 14.5 mm, the length is 15.5-20.5 mm, and the bottom of the arc striking groove 3 is arranged in a bevel edge 33; the thickness of the secondary type grid plate 57 is 1 mm, the total width is 34 mm, the total length is 36 mm, the width of the arc striking groove 3 of the secondary type grid plate 57 is 14.5 mm, the length is 14.5-16.5 mm, and the bottom of the arc striking groove 3 is arranged in a bevel edge 33; the thickness of the second three type grid plates 58 is 1 mm, the total width is 34 mm, the total length is 28 mm, the width of the arc striking groove 3 of the second three type grid plates 58 is 14.5 mm, the length is 11.5-16.5 mm, and the bottom of the arc striking groove 3 is arranged in a bevel edge 33; the thickness of the four-time type grid piece 59 is 1 mm, the total width is 34 mm, the total length is 21.5 mm, a protruding part with the width of 16-17 mm and the length of 1.5 mm is arranged at the end part of the four-time type grid piece 59 opposite to the air outlet side 12, the width of the arc striking groove 3 of the four-time type grid piece 59 is 12 mm, the length of the arc striking groove 3 is 12.3 mm, and an arc striking angle 36 is arranged at the bottom of the arc striking groove 3.

The number of the grid pieces of the arc extinguish chamber is 21.

Claims (7)

1. The utility model provides an explosion chamber structure of high voltage direct current circuit breaker, includes the arc extinguishing bars piece that a plurality of intervals set up, sets up in the flash barrier and the arc extinguishing chamber of arc extinguishing bars piece both sides, be equipped with the arc chute on the arc extinguishing bars piece, the explosion chamber is including advancing arc side and gas outlet side, its characterized in that: the arc extinguishing bars comprise special main bars, main bars and secondary bars, wherein the first to fourth bars are special main bars, the fifth to fourteenth bars are main bars, and the rest are secondary bars from one side relatively close to the static contact, the thickness of the special main bars is 1.2 to 2 mm, the special main bars and the main bars are provided with narrowing extension ends, the narrowing extension ends are provided with end parts of the bars opposite to the gas outlet side, and the width of the narrowing extension ends is smaller than the width of the bars.

2. The arc chute structure of a high voltage direct current circuit breaker according to claim 1, characterized in that: in the special main grid plates, the first grid plate relatively close to one side of the static contact is a special type grid plate, the second grid plate is a special type grid plate, and the third to fourth grid plates are special type grid plates;

the special type grid plate is 1.2 to 1.8 mm in thickness, 30 to 40 mm in total width and 42 to 55 mm in total length, a narrowing extension end which is 22 to 32 mm in width and 7 to 22 mm in length is arranged, and the narrowing extension end and the grid plate are in chamfer transition;

the thickness of the special second type grid is 1.2-2 mm, the total width is 30-40 mm, the total length is 50-65 mm, a narrowing extension end with the width of 22-32 mm and the length of 7-22 mm is arranged, and the narrowing extension end and the grid are in chamfer transition;

the thickness of the special three types of grid plates is 1.2-2 mm, the total width is 30-40 mm, the total length is 50-65 mm, a narrowing extension end with the width of 22-32 mm and the length of 7-22 mm is arranged, and the narrowing extension end and the grid plates are in chamfer transition.

3. The arc chute structure of a high voltage direct current circuit breaker according to claim 2, characterized in that: the arc striking grooves of the special main grid pieces comprise wide groove ends and narrow groove ends;

the width of the wide groove end of the special type grid plate is 18.5 mm, the length of the wide groove end of the special type grid plate is 9.5 mm, the width of the narrow groove end of the special type grid plate is 14.5 mm, the length of the narrow groove end of the special type grid plate is 7-8.5 mm, the narrow groove end and the wide groove end of the special type grid plate are in chamfer transition, and the groove bottom of the narrow groove end is arranged in a bevel edge mode;

the width of the wide groove end of the special second type grid plate is 18.5 mm, the length of the wide groove end of the special second type grid plate is 12 mm, the width of the narrow groove end of the special second type grid plate is 14.5 mm, the length of the narrow groove end of the special second type grid plate is 10.5-16 mm, the narrow groove end and the wide groove end of the special second type grid plate are in arc transition, and the groove bottom of the narrow groove end is arranged in a;

the width of the wide groove end of the special three-type grid plate is 18.5 mm, the length of the wide groove end of the special three-type grid plate is 7 mm, the width of the narrow groove end of the special three-type grid plate is 14.5 mm, the length of the narrow groove end of the special three-type grid plate is 17-22 mm, the narrow groove end and the wide groove end of the special three-type grid plate are in arc transition, and the groove bottom of the narrow groove.

4. The arc chute structure of a high voltage direct current circuit breaker according to claim 3, characterized in that: the special type grid plate is 1.5 mm in thickness, 34 mm in total width, 48.5 mm in total length, and provided with a narrowed extension end with the width of 26.5 mm and the length of 16.25 mm;

the thickness of the special second type grid is 1.5 mm, the total width is 34 mm, the total length is 60.5 mm, and a narrowing extension end with the width of 26.5 mm and the length of 21.25 mm is arranged;

the thickness of the special three types of grid pieces is 1.5 mm, the total width is 34 mm, the total length is 61 mm, and a narrowing extension end with the width of 26.5 mm and the length of 21.75 mm is arranged.

5. The arc chute structure of a high voltage direct current circuit breaker according to claim 1, characterized in that: in the main grid pieces, the fifth to tenth grid pieces which are relatively close to one side of the static contact are main first-class grid pieces, and the eleventh to fourteenth grid pieces are main second-class grid pieces;

the thickness of the first-class grid sheet is 1 mm, the total width is 34 mm, the total length is 59 mm, a narrowing extension end with the width of 26.5 mm and the length of 22.75 mm is arranged, the width of an arc striking groove of the first-class grid sheet is 14.5 mm, the length of the arc striking groove is 24-26 mm, and the bottom of the arc striking groove is arranged in a bevel edge manner;

the thickness of the main second-class grid is 1 mm, the total width is 34 mm, the total length is 59.5 mm, a narrowing extension end with the width of 26.5 mm and the length of 22.75 mm is arranged, the width of an arc striking groove of the main second-class grid is 14.5 mm, the length of the arc striking groove is 19.5-24.5 mm, and the bottom of the arc striking groove is arranged in a bevel edge mode.

6. The arc chute structure of a high voltage direct current circuit breaker according to claim 1, characterized in that: among the secondary grid pieces, the fifteenth to eighteenth grid pieces relatively close to one side of the static contact are secondary grid pieces, the nineteenth grid pieces are secondary second grid pieces, the twenty-fifth grid pieces are secondary third grid pieces, and the twenty-fourth grid pieces are secondary fourth grid pieces;

the thickness of the second-class grid is 1 mm, the total width is 34 mm, the total length is 42 mm, the width of an arc striking groove of the second-class grid is 14.5 mm, the length is 15.5-20.5 mm, and the bottom of the arc striking groove is arranged in a bevel edge manner;

the thickness of the secondary type grid plate is 1 mm, the total width is 34 mm, the total length is 36 mm, the width of an arc striking groove of the secondary type grid plate is 14.5 mm, the length is 14.5-16.5 mm, and the bottom of the arc striking groove is arranged in a bevel edge manner;

the thickness of the third-class grid plate is 1 mm, the total width is 34 mm, the total length is 28 mm, the width of an arc striking groove of the third-class grid plate is 14.5 mm, the length is 11.5-16.5 mm, and the bottom of the arc striking groove is arranged in a bevel edge manner;

the thickness of four kind bars of time is 1 millimeter, and total width is 34 millimeters, and the total length is 21.5 millimeters, and the tip that should four kind bars of time relative gas outlet side is equipped with a width 16 to 17 millimeters, the bellying of length 1.5 millimeters, the striking groove width of four kind bars of time is 12 millimeters, and length is 12.3 millimeters, and this striking groove tank bottom is equipped with the striking angle.

7. The arc chute structure of a high voltage direct current circuit breaker according to claim 1, characterized in that: the number of the grid pieces of the arc extinguish chamber is 21.

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