A high-break arc extinguishing device and isolating switch unit

Abstract

The present invention relates to a disconnector and a high-break arc-extinguishing chamber with a staggered layout of surround-type grids. The high-break arc-extinguishing chamber comprises a first arc-extinguishing grid group and a second arc-extinguishing grid group with the same structure and an arc-extinguishing chamber frame. Grid slots are provided on both sides of the arc-extinguishing chamber frame. The first arc-extinguishing grid group and the second arc-extinguishing grid group are respectively arranged on both sides of the arc-extinguishing chamber frame through the grid slots. The first arc-extinguishing grid group and the second arc-extinguishing grid group each comprise a plurality of grids arranged longitudinally, a plurality of grids arranged transversely, and a connecting grid for connecting the longitudinal grids and the transverse grids. The longitudinal grids and the transverse grids arranged on the arc-extinguishing grid group are respectively staggered. Compared with the conventional layout, the present invention greatly increases the number of arc-extinguishing grids while keeping the occupied space unchanged, thereby enhancing the arc-extinguishing performance per unit volume, and improving the safety stability and the connection and disconnection capacity.

Description

Technical Field

[0001] The invention relates to the technical field of disconnecting switches, in particular to a high-break arc extinguishing device and a disconnecting switch unit. Background Art

[0002] With the continuous development of photovoltaic systems, the voltage of energy storage systems has increased from 600V to 1000V and then to the current mainstream 1500V system. The increase in voltage level can reduce system current, make the equipment size of the entire electrical system smaller, and reduce cable loss during power transmission, so as to increase the number of components connected to a single device, thereby improving system efficiency.

[0003] In photovoltaic and energy storage systems, electrical energy is usually generated and stored in the form of direct current. The energy storage system is usually composed of a battery cluster, which is composed of a battery high-voltage box and placed in a DC combiner. The DC power in the energy storage system is converted into AC power by a power storage converter (PCS), which can directly power the AC load. Isolating switches and fuses are usually set on the DC side of the PCS to ensure the safety of the combiners on both sides of the PCS.

[0004] In the prior art, disconnectors usually use a vertical monolithic stacking layout of arc-extinguishing grids. This technical solution only takes into account the use of longitudinal space. While the arc-extinguishing capacity is increased, the stacking height is often increased, resulting in a large product volume and insufficient internal space utilization. Existing disconnectors do not have an ideal arc-breaking effect in the mainstream 1500V high-voltage working environment, and have problems such as poor arc-extinguishing effect and poor safety performance. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention proposes a high-breaking arc extinguishing chamber and an isolating switch unit provided with such a high-breaking arc extinguishing chamber, which increases the unit arc extinguishing capacity while reducing the volume of the product, thereby improving the breaking capacity facing high voltages.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A high-break arc extinguishing chamber, the structure of which includes: a first arc extinguishing grid group, a second arc extinguishing grid group and an arc extinguishing chamber frame, grid slots are provided on both sides of the arc extinguishing chamber frame, the first arc extinguishing grid group and the second arc extinguishing grid group are respectively arranged on both sides of the arc extinguishing chamber frame through the grid slots, the first arc extinguishing grid group and the second arc extinguishing grid group both include a plurality of grids arranged longitudinally, a plurality of grids arranged transversely, and connecting grids arranged between the grids arranged longitudinally and the grids arranged transversely, when the first arc extinguishing grid group and the second arc extinguishing grid group are arranged on the arc extinguishing chamber frame, the longitudinally arranged grids on the first arc extinguishing grid group and the longitudinally arranged grids on the second arc extinguishing grid group are arranged alternately in the longitudinal direction, and the transversely arranged grids on the first arc extinguishing grid group and the transversely arranged grids on the second arc extinguishing grid group are arranged alternately in the transverse direction.

[0008] Preferably, the first arc-extinguishing grid group includes a plurality of first grids, a second grid and a plurality of third grids, the second grids are connecting grids, the first grids are arranged at uniform intervals in the longitudinal direction, and the third grids are arranged at uniform intervals in the transverse direction;

[0009] The second arc-extinguishing grid group comprises a plurality of fourth grids, a fifth grid and a plurality of sixth grids, the fifth grid (553) being a connecting grid, the fourth grids being arranged at even intervals in the longitudinal direction, and the sixth grids being arranged at even intervals in the transverse direction;

[0010] The end of the first grid piece is provided with a first grid piece extension portion, the end of the third grid piece is provided with a third grid piece extension portion, the end of the fourth grid piece is provided with a fourth grid piece extension portion, and the end of the sixth grid piece is provided with a sixth grid piece extension portion;

[0011] When the first arc-extinguishing grid group and the second arc-extinguishing grid group are arranged on the arc-extinguishing frame, the second grid and the fifth grid are arranged side by side on the same horizontal plane, the first grid and the fourth grid are arranged at the same intervals, the first grid extension portion and the fourth grid extension portion are staggered to form a first arc-extinguishing channel, the third grid and the sixth grid are arranged at the same intervals, the third grid extension portion and the sixth grid extension portion are staggered to form a second arc-extinguishing channel.

[0012] Preferably, the first arc extinguishing channel and the second arc extinguishing channel are two curved slot paths distributed at equal intervals.

[0013] Preferably, the first arc-extinguishing grid group and the second arc-extinguishing grid group are both provided with a fixing plate, the first grid, the second grid and the third grid are fixed to the first fixing plate and combined into the first arc-extinguishing grid group, and the fourth grid, the fifth grid and the sixth grid are fixed to the second fixing plate and combined into the second arc-extinguishing grid group.

[0014] Preferably, the arc extinguishing chamber frame is provided with a plurality of air outlets, and the air outlets are arranged at the top and rear end of the arc extinguishing chamber frame.

[0015] Preferably, the arc extinguishing chamber further comprises a permanent magnet and an insulating cover plate, a magnet box is provided in the middle section of the arc extinguishing chamber frame, the permanent magnet is arranged in the magnet box, and the insulating cover plate is wrapped around the outer side of the permanent magnet.

[0016] Preferably, the connecting grid is bent at an angle of 85° to 95°, with the longer end of the connecting grid adjacent to the grids arranged longitudinally, and the shorter end of the connecting grid adjacent to the grids arranged transversely.

[0017] Through the above-mentioned characteristic settings, the present invention realizes a high-breakage arc-extinguishing chamber, which is provided with more arc-extinguishing grids in a unit volume and achieves stronger arc-extinguishing performance by means of a staggered design.

[0018] Based on the above-mentioned high-breaking arc extinguishing chamber, the present invention also provides an isolating switch unit, whose structure includes: a contact system housing with a transparent observation window arranged on the contact system housing, a moving contact arranged at the center point of the contact system housing and moving in a circular motion, two groups of static contacts arranged in a mirror arrangement at the axis position of the contact system housing, and an arc extinguishing chamber.

[0019] Preferably, a knife-edge separation point is provided on the static contact, and the knife-edge separation points of the moving contact and the static contact are wrapped and arranged in the arc extinguishing chamber.

[0020] Preferably, an arc channel is further provided at the front end of the arc extinguishing chamber frame, and the position of the arc channel is adjacent to the moving contact.

[0021] The beneficial effects of the present invention are as follows: through the arrangement of the first arc-extinguishing grid group, the second arc-extinguishing grid group and the arc-extinguishing chamber frame and the staggered arrangement structure between the arc-extinguishing grids, the number of arc-extinguishing grids per unit volume of the arc-extinguishing chamber is greatly increased, thereby enhancing the arc-extinguishing ability of the arc-extinguishing chamber per unit volume and reducing the volume of the arc-extinguishing chamber. The disconnector using the arc-extinguishing chamber can be set up with a smaller volume, further improving the stability of the overall performance and achieving stronger arc-extinguishing performance at a lower cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional diagram of the isolating switch unit of the present invention.

[0023] Figure 2 This is a layout diagram of the arc extinguishing chamber and contacts according to an embodiment of the present invention.

[0024] Figure 3 It is a three-dimensional diagram of the arc extinguishing chamber according to an embodiment of the present invention.

[0025] Figure 4This is an exploded view of an arc extinguishing chamber according to an embodiment of the present invention.

[0026] Figure 5 It is a three-dimensional schematic diagram of the second arc-extinguishing grid group of the arc-extinguishing chamber according to an embodiment of the present invention.

[0027] Figure 6 It is a three-dimensional schematic diagram of the first arc-extinguishing grid group of the arc-extinguishing chamber according to an embodiment of the present invention.

[0028] Figure 7 It is a three-dimensional schematic diagram of the first side surface of the arc extinguishing chamber frame according to an embodiment of the present invention.

[0029] Figure 8 It is a three-dimensional schematic diagram of the second side surface of the arc extinguishing chamber frame of the embodiment of this aspect.

[0030] Fig. 9 It is a schematic diagram of assembling the first arc-extinguishing grid group and the second arc-extinguishing grid group of the arc-extinguishing chamber according to an embodiment of the present invention.

[0031] Fig.10 It is a schematic diagram of assembling the first arc-extinguishing grid group and the second arc-extinguishing grid group of the arc-extinguishing chamber according to an embodiment of the present invention.

[0032] Fig.11 It is a schematic diagram of the layout of arc extinguishing grids in the arc extinguishing chamber according to an embodiment of the present invention.

[0033] In the figure: 1, contact system housing; 2, transparent observation window; 3, moving contact; 4, static contact; 41, knife-edge separation point; 5, arc extinguishing chamber; 51, first arc extinguishing grid group; 511, first fixing plate; 512, first grid; 5121, first grid extension; 513, second grid; 514, third grid; 5141, third grid extension; 52, arc extinguishing chamber frame; 521, arc channel; 522, first air outlet; 523, second air outlet; 524, third air outlet; 525, first Four air outlets; 526, the fifth air outlet; 527, the magnet box; 528, the first side; 5281, the first grid slot; 5282, the second grid slot; 529, the second side; 53, the permanent magnet; 54, the insulating cover; 55, the second arc-extinguishing grid group; 551, the second fixed plate; 552, the fourth grid; 5521, the fourth grid extension; 553, the fifth grid; 554, the sixth grid; 5541, the sixth grid extension; 56, the first arc-extinguishing channel; 57, the second arc-extinguishing channel. DETAILED DESCRIPTION

[0034] The present invention is described in detail below with reference to the accompanying drawings.

[0035] The present invention relates to a high-voltage interrupter and an isolating switch unit. Figure 1As shown, a disconnector unit comprises a contact system housing 1, a transparent observation window 2 arranged on the contact system housing 1, a moving contact 3 arranged at the center point of the contact system housing 1 and moving in a circular motion, and two groups of stationary contacts 4 arranged at the axis position of the contact system housing 1 and arranged in a mirrored manner. Figure 2 As shown, the moving contact 3 is a double breakpoint structure, and the arc extinguishing chamber 5 is distributed on the arc-shaped motion track of the moving contact 3. One end face of the arc extinguishing chamber 5 is set at the blade separation point 41 of the static contact 4, and the other end face is set at one-third of the maximum opening and closing angle of the moving contact 3. The transparent observation window 2 is located directly above two-thirds of the maximum opening and closing angle of the moving contact 3. The moving contact 3 and the static contact 4 are both covered in the arc extinguishing chamber 5. The position of the arc extinguishing chamber 5 is designed along the motion path of the moving contact 3. The arc extinguishing chamber 5 stops at one-third of the maximum opening and closing position of the moving contact, ensuring that the arc is completely in the arc extinguishing chamber 5 when the moving contact 3 is in the open position, preventing the arc from overflowing and splashing to the observation window to cause personal or equipment safety hazards, and ensuring the safety of product use. The exposed two-thirds of the moving contact 3 ensures that the user is not blocked when observing the working status of the disconnector, so that the user can instantly observe the working status of the moving contact 3 through the transparent observation window 2, taking into account the practicality of the present invention during operation. When the disconnector unit is working, the moving contact 3 is separated from the blade separation point 41 of the static contact 4, and the arc generated at this time is attracted into the arc extinguishing chamber 5 by the permanent magnet 53 arranged in the arc extinguishing chamber 5. The arc is cut by the arc extinguishing sheet and becomes a smaller arc and finally extinguishes.

[0036] like Figure 3 The structure of the arc extinguishing chamber 5 includes an arc extinguishing chamber frame 52, a first arc extinguishing grid group 51 and a second arc extinguishing grid group 55 arranged on both sides of the arc extinguishing chamber frame 52 in a staggered grid arrangement. A magnet box 527 is designed in the middle of the arc extinguishing chamber frame 52 along the arc-shaped motion track of the moving contact 3, and a first side clamping groove 528 and a second side clamping groove 529 are designed on both sides of the arc extinguishing chamber frame 52. The first arc extinguishing grid group 51 adopts a single-sided riveting process, and is installed in the first grid clamping groove 5281 of the first side 528 of the arc extinguishing chamber frame 52 after the grid is riveted and fixed to the first fixing plate 511. The second arc extinguishing grid group 55 also adopts a single-sided riveting process, and is installed in the second grid clamping groove 5282 of the second side 529 of the arc extinguishing chamber frame 52 after the grid is riveted and fixed to the second fixing plate 551. The riveting process of the grid fixes different types of grids in the grid group into a whole, making the structure of the grid group more stable.

[0037] like Figure 4, a magnet box 527 is provided in the middle section of the arc extinguishing chamber frame 52, a permanent magnet 53 is provided in the magnet box 527, and an insulating cover plate 54 is provided above the permanent magnet 53 to wrap the permanent magnet 53. An arc channel 521 is designed at the front end of the arc extinguishing chamber frame 52 along the arc motion track of the moving contact 3, and the arc channel 521 is covered with gas-producing materials close to both sides of the moving contact 3. The top of the arc extinguishing chamber frame 52 is provided with a first gas outlet 522, a second gas outlet 523, and a third gas outlet 524, and the rear end is provided with a fourth gas outlet 525 and a fifth gas outlet 526. The arc generated when the moving contact is disconnected is introduced into the arc extinguishing chamber 5 through the arc channel 521. When the arc passes through the arc channel 521, the gas-producing material generates gas, and the gas drives the arc to cut and extinguish the arc through the arc extinguishing chamber 5, and finally discharged through the gas outlets provided at the top and rear end of the arc extinguishing chamber. Each air outlet in the arc extinguishing chamber 5 accelerates the staggered cutting process of the arc by exhausting air, thereby accelerating the arc extinguishing process of the arc.

[0038] In the present invention, the interlaced relationship between the first arc-extinguishing grid group 51 and the second arc-extinguishing grid group 55 is formed by the corresponding complementary interlaced relationship of various grids. The shapes of the grids of various types and the positional relationship on the first and second arc-extinguishing grid groups will be described in detail below. In the present invention, the thickness of the grids of various types is equal, and the thickness of the grid is taken as the standard value "n". The specifications of various grids and the positional relationship such as the spacing will be specifically described below by the standard unit "n".

[0039] like Figure 5The first arc-extinguishing grid group 51 is composed of a first fixed plate 511, a first grid 512, a second grid 513, and a third grid 514. The first grid 512 is L-shaped, with one end arranged along the fixed plate as the inner end and one end arranged perpendicular to the fixed plate as the outer end. The structure of the first grid 512 is narrow at the inner end and wide at the outer end. A first grid extension 5121 with a length of 6n, a width of 4n, and a thickness of 1n is also provided at the head position of the outer end of the first grid 512. The first grids 512 are arranged in a longitudinal array on the first fixed plate 511, and the spacing between the upper and lower first grids 512 is 2n. The shape of the third grid 514 is quasi-triangular, and one end arranged perpendicular to the fixed plate is provided with a third grid extension 5141 with a specification of a length of 6n, a width of 3.5n, and a thickness of 1n. The third grid pieces 514 are arranged in a horizontal array on the first fixed plate 511, and the spacing between two third grid pieces 514 is 2n. At the same time, in this embodiment, in order to further increase the density of the grid pieces, some of the third grid pieces 514 are arranged in a vertical array between the second grid piece 513 and the first grid piece 512. The second grid piece 513 is a larger grid piece with an L-shape and a bending angle of nearly 90°. Its shorter side is deeply inserted into the arrangement path of the grid pieces arranged horizontally, and its longer side is arranged close to the grid pieces arranged vertically. The second grid piece 513 short-circuits the first grid piece 512 and the third grid piece 514 as a whole, so that the arc can be cut and extinguished more smoothly during the arc extinguishing process, avoiding the problem of arc overflow due to poor connection of each grid piece area. A notch is provided at the bend of the second grid piece 513, and the notch and the third grid piece 514 form an airflow channel. The airflow drives the arc to pass through the third grid piece 514 and then enter the area of ​​the first grid piece 512 from the channel.

[0040] like Figure 6, corresponding to the first arc-extinguishing grid group 51, the second arc-extinguishing grid group 55 is composed of a second fixed plate 551, a fourth grid 552, a fifth grid 553, and a sixth grid 554. The fourth grid 552 is in the shape of an axe, with one end arranged along the fixed plate as the inner end and one end arranged perpendicular to the fixed plate as the outer end. The structure of the fourth grid 552 is narrow at the inner end and wide at the outer end. A fourth grid extension 5521 with a length of 6n, a width of 4n, and a thickness of 1n is provided at a distance of 5n from the outer end of the fourth grid 552. The fourth grid 552 is arranged in a longitudinal array on the second fixed plate 551, and the spacing between the upper and lower fourth grids 552 is 2n. The sixth grid 554 is in the shape of a pickaxe, and one end arranged perpendicular to the fixed plate is narrower and is provided with a sixth grid extension 5541 with a length of 6n, a width of 3.5n, and a thickness of 1n. The sixth grid pieces 554 are arranged in a horizontal array on the second fixed plate 551, and the spacing between the two sixth grid pieces is 2n. Similar to the first arc-extinguishing grid piece group 51, in this embodiment, in order to further increase the grid piece density, some of the sixth grid pieces 554 are also arranged in a vertical array between the fifth grid piece 553 and the fourth grid piece 552. The fifth grid piece 553 is the same in shape as the second grid piece 513, and is a larger grid piece with an L-shape and a bend of nearly 90°. Its shorter side is deeply inserted into the arrangement path of the horizontally arranged grid pieces, and its longer side is arranged close to the vertically arranged grid pieces. The fifth grid piece 553 short-circuits the fourth grid piece 552 and the sixth grid piece 554 as a whole, so that the arc can be cut and extinguished more smoothly during the arc extinguishing process, avoiding the problem of arc overflow due to poor connection of each grid piece area. A notch is cut at the bend of the fifth grid piece 553 to form an airflow channel with the sixth grid piece 554 . The airflow drives the arc through the sixth grid piece 554 and then enters the area of ​​the fourth grid piece 552 through the airflow channel.

[0041] like Figure 7 , Figure 8 The arc extinguishing chamber frame 52 is designed with a first side 528 and a second side 529 on both sides. The first side 528 has a first grid slot 5281 arranged in an array with a spacing of 3n, and the second side 529 has a second grid slot 5282 arranged in an array with a spacing of 3n. The vertical dimensions of the first grid slot 5281 and the second grid slot 5282 differ by 1.5n. The first arc extinguishing grid group 51 is installed in the first grid slot 5281 of the first side 528 of the arc extinguishing chamber frame 52. The second arc extinguishing grid group 55 is installed in the second grid slot 5282 of the second side 529 of the arc extinguishing chamber frame 52. After installation, the vertical spacing of each grid of the first arc extinguishing grid group 51 and the second arc extinguishing grid group 55 is kept equidistant.

[0042] like Fig. 9 , Fig.10 , Fig.11After the first arc-extinguishing grid group 51 and the second arc-extinguishing grid group 55 are assembled, the first grid 512 and the fourth grid 552 arranged in the longitudinal direction are staggered in the longitudinal direction, and each corresponding first grid extension 5121 and the fourth grid extension 5521 are staggered to form a first arc-extinguishing channel 56 with an inverted Z shape and a width of 1n. After the first arc-extinguishing grid group 51 and the second arc-extinguishing grid group 55 are assembled, the third grid 514 and the sixth grid 554 arranged in the transverse direction are staggered in the longitudinal direction, and each corresponding third grid extension 5141 and the sixth grid extension 5541 are staggered to form a second arc-extinguishing channel 57 with an inverted Z shape and a width of 1n. The first grid 512 of the first arc-extinguishing grid group 51 and the fourth grid 552 of the second arc-extinguishing grid group 55 are staggered, and the grid spacing in the vertical direction is 1.3n. After the arc enters the arc extinguishing chamber 5, it is divided into small arc segments through the first arc extinguishing channel 56 and the second arc extinguishing channel 57 to achieve the effect of arc extinguishing. The inverted Z-shaped arc extinguishing channel allows the arc to fully release energy in the arc extinguishing grid to extinguish the arc. At the same time, this structure also increases the heating area of ​​the arc extinguishing grid, thereby enhancing the heat resistance of the arc extinguishing grid and extending the service life of the arc extinguishing grid and the arc extinguishing chamber 5. After the first arc extinguishing grid group 51 and the second arc extinguishing grid group 55 are assembled, an equidistant insulating space is formed in the upper, lower, left and right directions, thereby preventing overlapping short circuits between the grids.

[0043] The present invention makes full use of the lateral and longitudinal spaces in the contact system chamber by staggered meshing and stacking of the grid plates, and can increase the number of arc extinguishing grid plates to more than twice that of the prior art under the same volume, and can cut the arc into more short arcs under the same volume, significantly increasing the loop resistance and effectively improving the arc extinguishing capacity. The isolating switch unit using such an arc extinguishing chamber 5 can also reduce the volume, enhance the stability of the arc extinguishing performance, and further improve the safety performance.

[0044] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "lateral", "longitudinal", "longitudinal" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0045] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "Z-shaped", "L-shaped", "axe-shaped", "pick-shaped", "triangle-shaped", etc. should be understood in a broad sense. For example, the arc extinguishing channel formed between the grid plates is not limited to the Z-shaped, but can be any regular two-section curved slot path. The units of "n", "1.3n", "2n" and other units describing the spacing size in the above text are only limited to this embodiment. The protection scope of the present invention is not limited to a specific size, but includes a size range close to the size.

[0046] The above content describes the structure, specific features, usage methods and advantages of the present invention. It should be noted that the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made by adopting the technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention. The scope of protection required by the present invention is defined by the attached claims and their equivalents.

Claims

1. A high-break arc extinguishing chamber, characterized in that: The structure comprises: a first arc-extinguishing grid group (51), a second arc-extinguishing grid group (55) and an arc-extinguishing chamber frame (52); grid slots are provided on both sides of the arc-extinguishing chamber frame (52); the first arc-extinguishing grid group (51) and the second arc-extinguishing grid group (55) are respectively arranged on both sides of the arc-extinguishing chamber frame (52) through the grid slots; the first arc-extinguishing grid group (51) and the second arc-extinguishing grid group (55) each comprise a plurality of grids arranged longitudinally, a plurality of grids arranged transversely, and a plurality of grids arranged longitudinally. The invention relates to a connecting grid between the longitudinally arranged grids and the transversely arranged grids, wherein when the first arc-extinguishing grid group (51) and the second arc-extinguishing grid group (55) are arranged on the arc-extinguishing chamber frame (52), the longitudinally arranged grids on the first arc-extinguishing grid group (51) and the longitudinally arranged grids on the second arc-extinguishing grid group (55) are arranged alternately in the longitudinal direction, and the transversely arranged grids on the first arc-extinguishing grid group (51) and the transversely arranged grids on the second arc-extinguishing grid group (55) are arranged alternately in the transverse direction.

2. A high-break arc extinguishing chamber according to claim 1, characterized in that: The first arc-extinguishing grid group (51) comprises a plurality of first grids (512), a second grid (513) and a plurality of third grids (514), the second grids (513) being connecting grids, the first grids (512) being arranged at even intervals in a longitudinal direction, and the third grids (514) being arranged at even intervals in a transverse direction; The second arc-extinguishing grid group (55) comprises a plurality of fourth grids (552), a fifth grid (553) and a plurality of sixth grids (554), the fifth grid (553) being a connecting grid, the fourth grids (552) being arranged at even intervals in the longitudinal direction, and the sixth grids being arranged at even intervals in the transverse direction; The end of the first grid piece (512) is provided with a first grid piece extension portion (5121), the end of the third grid piece (514) is provided with a third grid piece extension portion (5141), the end of the fourth grid piece (552) is provided with a fourth grid piece extension portion (5521), and the end of the sixth grid piece (554) is provided with a sixth grid piece extension portion (5541); When the first arc-extinguishing grid group (51) and the second arc-extinguishing grid group (55) are arranged on the arc-extinguishing frame (52), the second grid (513) and the fifth grid (553) are arranged side by side on the same horizontal plane, the first grid (512) and the fourth grid (552) are arranged in a staggered manner at the same interval, the first grid extension portion (5121) and the fourth grid extension portion (5521) are staggered to form a first arc-extinguishing channel (56), the third grid (514) and the sixth grid (554) are arranged in a staggered manner at the same interval, and the third grid extension portion (5141) and the sixth grid extension portion (5541) are staggered to form a second arc-extinguishing channel (57).

3. A high-break arc extinguishing chamber according to claim 2, characterized in that: The first arc extinguishing channel (56) and the second arc extinguishing channel (57) are two sections of bent slot paths distributed at equal intervals.

4. A high-break arc extinguishing chamber according to claim 2, characterized in that: The first arc-extinguishing grid group (51) and the second arc-extinguishing grid group (55) are both provided with a fixing plate; the first grid (512), the second grid (513), and the third grid (514) are fixed to the first fixing plate (511) and are combined into the first arc-extinguishing grid group (51); the fourth grid (552), the fifth grid (553), and the sixth grid (554) are fixed to the second fixing plate (551) and are combined into the second arc-extinguishing grid group (55).

5. A high-break arc extinguishing chamber according to claim 1, characterized in that: The arc extinguishing chamber frame (52) is provided with a plurality of air outlets, and the air outlets are arranged at the top and rear end of the arc extinguishing chamber frame (52).

6. A high-break arc extinguishing chamber according to claim 1, characterized in that: The arc extinguishing chamber (5) further comprises a permanent magnet (53) and an insulating cover plate (54); a magnet box (527) is provided in the middle section of the arc extinguishing chamber frame (52); the permanent magnet (53) is arranged in the magnet box (527); and the insulating cover plate (54) is wrapped around the outer side of the permanent magnet (53).

7. A high-break arc extinguishing chamber according to claim 1, characterized in that: The connecting grid is bent at an angle of 85° to 95°, a longer end of the connecting grid is adjacent to the grid arranged in the longitudinal direction, and a shorter end of the connecting grid is adjacent to the grid arranged in the transverse direction.

8. An isolating switch unit, comprising the high-break arc extinguishing chamber according to any one of claims 1 to 7, characterized in that: The structure comprises: a contact system housing (1), a transparent observation window (2) arranged on the contact system housing, a moving contact (3) arranged at the center point of the contact system housing and moving in a circular motion, two groups of stationary contacts (4) arranged at the axis position of the contact system housing and arranged in a mirrored manner, and an arc extinguishing chamber (5).

9. The isolating switch unit according to claim 8, characterized in that: The static contact (4) is provided with a knife-edge separation point (41), and the knife-edge separation points (41) of the moving contact (3) and the static contact (4) are wrapped and arranged in the arc extinguishing chamber (5).

10. The isolating switch unit according to claim 8, characterized in that: An arc channel (521) is also provided at the front end of the arc extinguishing chamber frame (52), and the position of the arc channel is adjacent to the moving contact (3).

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