Arc extinguishing structure of circuit breaker

Abstract

The invention belongs to the technical field of switches, and particularly relates to an arc extinguishing structure of a circuit breaker. According to the invention, in the original height space of the arc extinguishing mechanism, the original arc extinguishing grid sheets which are arranged transversely or approximately transversely and close to the static contact side are changed into the plurality of first arc extinguishing grid sheets which are arranged vertically or approximately vertically, so that more arc extinguishing grid sheets can be arranged in the area of the part, and the layout of more arc extinguishing grid sheets is realized; and the first insulating part is arranged above, so that the electric arc in the first arc extinguishing space is prevented from running to the second arc extinguishing space from the arc inlet side, and more first arc extinguishing grid plates effectively participate in arc extinguishing. Due to the fact that the number of the grid pieces is increased and the electric arc below the grid pieces is lengthened, compared with traditional L-shaped and C-shaped structures, the arc voltage is improved by more than 40%, and the breaking capacity is remarkably improved.

Description

Technical Field

[0001] The invention belongs to the technical field of switches, and in particular relates to an arc extinguishing structure of a circuit breaker. Background Art

[0002] The arc extinguishing chamber in a circuit breaker extinguishes the arc generated when the contacts open due to a short circuit. The greater the number of grids, while ensuring a certain gap between the grids, the easier it is to raise the arc voltage and extinguish the arc. To achieve high breaking capacity in high-voltage circuit breakers, methods such as enlarging the arc extinguishing chamber, lengthening the contacts to increase the contact spacing, and connecting multiple breakpoints in series are commonly used. While these methods can improve the breaking capacity of the circuit breaker, they significantly increase the size of the circuit breaker. This technical approach of increasing breaking capacity by sacrificing the size of the circuit breaker clearly does not meet market demand. Summary of the Invention

[0003] The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art and to provide an arc extinguishing structure for a circuit breaker.

[0004] The technical solution adopted by the present invention is as follows: an arc extinguishing structure of a circuit breaker, comprising: The static contact has a conductive plate, and the upper surface of the conductive plate is provided with a static contact point; The moving contact has a moving contact point and is located above the static contact. It can move between a closed position and an open position. A plurality of arc-extinguishing grids are distributed on one side of the static contact and the moving contact, have an arc-entry side close to the static contact and the moving contact and an arc-exit side away from the static contact and the moving contact, and include a plurality of first arc-extinguishing grids and a plurality of second arc-extinguishing grids; A first insulating member is provided, wherein the first insulating member is arranged higher than the conductive plate; A plurality of first arc-extinguishing grids are located in a first arc-extinguishing space formed below the first insulating member and the end surface of the conductive plate, wherein the first arc-extinguishing grids are arranged vertically or inclined relative to the vertical direction, and the plurality of first arc-extinguishing grids are sequentially distributed from the arc-entry side to the arc-exit side to form a first arc-extinguishing grid group; A plurality of second arc-extinguishing grids are located in the second arc-extinguishing space above the first insulating member. The second arc-extinguishing grids are arranged in a transverse or oblique direction to form a second arc-extinguishing grid group.

[0005] The first arc-extinguishing grid in the first arc-extinguishing space is arranged vertically or obliquely at an angle α relative to the vertical, where α is ≤ 30°.

[0006] The first insulating member is a first insulating partition arranged in a transverse or oblique direction, and a first notch for guiding the arc to enter is provided on a side facing the moving contact.

[0007] The first insulating member is a first insulating partition that is obliquely arranged and has a side closer to the arc-exiting side higher than a side closer to the arc-entering side. The first arc-extinguishing grids of the first arc-extinguishing grid group are distributed in an oblique line shape with a side closer to the arc-exiting side higher than a side closer to the arc-entering side.

[0008] It also includes a static arc-striking plate, which includes a third plate and a fourth plate connected by a bend. The third plate is fastened to the lower surface of the conductive plate by screws, and the fourth plate is located on one side of the conductive plate. The fourth plate is separated from the static contact by a certain distance d and d≥3mm.

[0009] The static arc-striking plate is composed of a third plate and a fourth plate. The fourth plate is fitted to the side of the conductive plate. A gap is provided between the first arc-extinguishing grid group and the fourth plate.

[0010] The screw connecting the third plate body and the conductive plate is located between the static contact point and the fourth plate body.

[0011] It also includes an intermediate arc-striking plate, which includes a first plate and a second plate. The first plate is arranged vertically or obliquely, and the second plate is arranged horizontally or obliquely. The upper end of the first plate is bent and connected to the end of the second plate away from the moving contact. The first arc-extinguishing grid is distributed between the static arc-striking plate and the first plate. The second plate is located above the first insulating member, and the second arc-extinguishing grid is distributed above the second plate.

[0012] It also includes a movable arc-striking piece, which is arranged close to the movable contact located in the opening position, and the second arc-extinguishing grid is distributed between the second plate and the movable arc-striking piece; The second arc-extinguishing grid group is arranged in an L-shape, including a third arc-extinguishing grid group longitudinally distributed above the first insulating member and a fourth arc-extinguishing grid group transversely distributed from the upper end of the third arc-extinguishing grid group toward the moving contact in the opening position. The second arc-extinguishing grids constituting the third arc-extinguishing grid group are arranged in parallel, and the second arc-extinguishing grids constituting the fourth arc-extinguishing grid group are arranged in parallel. The two groups are transitionally connected by a fifth arc-extinguishing grid group that is partially distributed in a fan shape.

[0013] The static contact includes a connecting plate and a terminal plate. The conductive plate, the connecting plate, and the terminal plate are connected in sequence, and one end of the conductive plate away from the first arc-extinguishing grid group is bent and connected to the connecting plate to form a height difference between the two. A second insulating member is provided. The second insulating member is located between the connecting plate and the first insulating member and is separated from the first insulating member by a certain distance. The first insulating member, the side surface of the conductive plate, and the second insulating member form a first arc-extinguishing space for accommodating the first arc-extinguishing grid group.

[0014] The second insulating member includes a second insulating plate, and a first protrusion and a second protrusion are respectively provided at both ends of the second insulating plate. The first protrusion is wrapped around the part where the conductive plate and the connecting plate are bent and connected, and the edge of the first protrusion is close to the static contact. The second protrusion is located on the side of the first plate body away from the first arc-extinguishing grid group, and the upper end of the second protrusion extends to the height position of the second arc-extinguishing grid group. The connecting plate is fixed to the lower surface of the second insulating plate, and a through opening is provided on the second insulating plate for the conductive plate to pass through. The edge of the through opening is located below the first arc-extinguishing grid group. The second insulating member includes a third insulating plate, and the third insulating plate is fixed at the through opening to insulate and separate the first arc-extinguishing grid group and the connecting plate.

[0015] The present invention has the following beneficial effects: Within the existing height space of the arc-extinguishing mechanism, the present invention replaces the previously horizontally or nearly horizontally arranged arc-extinguishing grids near the static contact side with a plurality of first arc-extinguishing grids arranged vertically or nearly vertically. This allows for the placement of a larger number of arc-extinguishing grids in this area, enabling a wider range of arc-extinguishing grid layouts. Furthermore, a first insulating member is provided above to prevent the arc in the first arc-extinguishing space from escaping to the second arc-extinguishing space on the arc-entry side, allowing more first arc-extinguishing grids to effectively participate in arc extinguishing. Due to the increased number of grids and the elongated arc at the bottom, this structure increases the arc voltage by over 40% compared to traditional L-shaped and C-shaped structures, significantly improving the breaking capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying any creative work, other drawings obtained based on these drawings still fall within the scope of the present invention.

[0017] Figure 1 A three-dimensional view of an embodiment of the present invention; Figure 2 An exploded view of an embodiment of the present invention; Figure 3 This is a schematic structural diagram of a static contact according to an embodiment of the present invention; Figure 4 A cross-sectional view of an embodiment of the present invention; Figure 5 A cross-sectional view of the coordinated structure of the arc extinguishing grid, the first insulating member and the arc striking assembly in one embodiment of the present invention; Figure 6 for Figure 4 A magnified schematic diagram of part A; Figure 7 An exploded view of the cooperation structure between the static contact and the second insulating member in one embodiment of the present invention; Figure 8 This is a schematic structural diagram of a first insulating member in an embodiment of the present invention; Figure 9 A schematic structural diagram of an intermediate arc-starting plate in an embodiment of the present invention; Figure 10 This is a schematic diagram of the location of the magnetizing plate in one embodiment of the present invention; Figure 11 This is a schematic diagram of arc extinguishing during the opening process of an embodiment of the present invention; In the figure, Static contact-100, static contact point-110, conductive plate-120, connecting plate-130, terminal block-140, Moving contact-200, moving contact-210, Side panels - 300, The first arc quenching grid group 410, the second arc quenching grid group 420, the third arc quenching grid group 421, the fourth arc quenching grid group 422, the fifth arc quenching grid group 423, Static arc-striking piece-510, third plate-511, fourth plate-512, middle arc-striking piece-520, first plate-521, second plate-522, dynamic arc-striking piece-530, fifth plate-531, sixth plate-532, First insulating member-600, first notch-610, Second insulating member 700, second insulating plate 710, through-hole 711, first protrusion 720, second protrusion 730, third insulating plate 740; Gas production plate-800, magnetization plate-810. DETAILED DESCRIPTION

[0018] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be described in further detail below with reference to the accompanying drawings.

[0019] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for the purpose of distinguishing two non-identical entities with the same name or non-identical parameters. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. Subsequent embodiments will not explain this one by one.

[0020] The terms used in this disclosure, such as up, down, front, back, left, right, inside, outside, top, bottom, and side, refer only to the directions or positions in the accompanying drawings. Therefore, the terms used are intended to illustrate and facilitate understanding of this disclosure and are not intended to limit the scope of protection of this disclosure. The up-and-down direction is considered vertical, the direction perpendicular to the vertical on paper, or the left-and-right direction, is considered horizontal, and the direction between the horizontal and vertical directions is considered diagonal.

[0021] A switching unit, such as Figure 1 、 Figure 2 As shown, it includes a conducting mechanism and an arc extinguishing mechanism.

[0022] The conductive mechanism includes a static contact 100 and a movable contact 200 that cooperate with each other. The static contact 100 has a static contact point 110, and the movable contact 200 has a movable contact point 210. The movable contact 200 is movable relative to the static contact 100 and has a closing position and an opening position. When the movable contact 200 moves from the closing position to the opening position, an arc is generated between the static contact point 110 and the movable contact 210. Figure 3 As shown, the static contact 100 of the present application includes a conductive plate 120, a connecting plate 130, and a terminal block 140 connected in sequence. The static contact 110 is disposed on the upper surface of the conductive plate 120. The arc extinguishing mechanism includes two opposing side plates 300 and a plurality of arc extinguishing grids fixed between the side plates 300, which are used to cut the arc generated between the static contact 100 and the moving contact 200 when they are disconnected. The static contact 110 and the moving contact 210 are made of a welding-resistant electrical contact material, such as silver.

[0023] In some embodiments of the present invention, the movable contact 200 is moved by pivoting, and the stationary contact 110 is located on one side of the moving contact 210's movement trajectory. The movable contact 210 can be pivoted to move closer to the stationary contact 110 to engage with the stationary contact 110 or further away from the stationary contact 110. Specifically, the switch unit is a circuit breaker or a disconnector.

[0024] Specifically, such as Figure 4As shown, the plurality of arc-extinguishing grids include a plurality of first arc-extinguishing grids and a plurality of second arc-extinguishing grids, and a first insulating member 600 is provided. The first insulating member 600 is arranged higher than the conductive plate 120. The plurality of first arc-extinguishing grids are located in a first arc-extinguishing space formed below the first insulating member 600 and the side of the conductive plate 120. The first arc-extinguishing grids are arranged vertically or obliquely at an angle α relative to the vertical and are sequentially distributed in the horizontal direction to form a first arc-extinguishing grid group 410, where α is ≤ 30°. The openings of the first arc-extinguishing grids face the first insulating member 600. The plurality of second arc-extinguishing grids are located in a second arc-extinguishing space formed above the first insulating member 600. The second arc-extinguishing grids are arranged horizontally or obliquely and are sequentially distributed in the longitudinal direction to form a second arc-extinguishing grid group 420. The openings of the second arc-extinguishing grids face the moving path of the moving contact 200. The arc-extinguishing grids arranged horizontally or nearly horizontally in the side space of the static contact in the existing conventional layout are changed to a plurality of first arc-extinguishing grids arranged vertically or nearly vertically, so as to realize the layout of a larger number of arc-extinguishing grids, and a first insulating member is arranged on the top to prevent the arc in the first arc-extinguishing space from running to the second arc-extinguishing space on the arc-entry side, so that more first arc-extinguishing grids can effectively participate in arc extinguishing.

[0025] Here, "being arranged obliquely at an angle α relative to the vertical" means that the first arc-extinguishing grid is inclined α to the left or α to the right relative to the vertical direction. For the same space, if α is set too large, the number of grids will be less, so α is set to ≤ 30°.

[0026] like Figure 8 As shown, the first insulating member 600 is a first insulating partition arranged horizontally or obliquely. A first notch 610 is provided on the side facing the movable contact 200 to guide the arc. This stretches the arc between the static contact 110 and the first insulating member 600, allowing all first arc-quenching grids in the first arc-quenching space to effectively participate in arc extinguishing. The arc between the first insulating member 600 and the movable contact 210 stretches as the movable contact 210 opens, and is effectively extinguished by the second arc-quenching grid group 420. This provides more space for installing a larger number of second arc-quenching grids.

[0027] In some embodiments of the present application, the conductive plate 120 and the connecting plate 130 are bent and connected to form a height difference therebetween. A second insulating member 700 is provided. The second insulating member 700 is located between the connecting plate 130 and the first insulating member 600 and is spaced a certain distance from the first insulating member 600. The first insulating member 600, the side surface of the conductive plate 120, and the second insulating member 700 form a first arc-extinguishing space for accommodating the first arc-extinguishing grid assembly 410. Preferably, the second insulating member 700 is in contact with the connecting plate 130.

[0028] In some embodiments of the present application, the arc extinguishing mechanism includes an arc striking assembly, Figure 4-Figure 6As shown, the arc-striking assembly includes a static arc-striking piece 510, an intermediate arc-striking piece 520, and a dynamic arc-striking piece 530. The static arc-striking piece 510 is arranged close to the static contact 100, the intermediate arc-striking piece 520 includes a first plate 521 and a second plate 522, and the dynamic arc-striking piece 530 is arranged close to the dynamic contact 200 located in the opening position. The first plate 521 is arranged vertically or obliquely, and the second plate 522 is arranged horizontally or obliquely. The upper end of the first plate 521 is bent and connected to the end of the second plate 522 away from the dynamic contact 200. The first arc-extinguishing grid is distributed between the static arc-striking piece 510 and the first plate 521, the second plate 522 is located above the first insulating member 600, and the second arc-extinguishing grid is distributed between the second plate 522 and the dynamic arc-striking piece 530. The static arc-striking piece 510 serves to guide the arc on the static contact 100 to the first arc-extinguishing grid group 410, and the moving arc-striking piece 530 serves to guide the arc on the moving contact 200 located in the open position to the second arc-extinguishing grid group 420. The intermediate arc-striking piece 520 serves to guide the first arc-extinguishing grid group 410 upward from the side of the first insulating member 600 away from the static contact 100, so as to prevent the arc from remaining in the arc-extinguishing chamber between the first insulating member 600 and the connecting plate 130.

[0029] In some embodiments of the present application, the end of the conductive plate 120 away from the first arc-quenching grid group 410 is bent and connected to the connecting plate 130. The static arc-strike plate 510 is composed of a third plate 511 and a fourth plate 512, which are bent and connected. The third plate 511 is fixedly connected to the lower surface of the conductive plate 120, and the fourth plate 512 is located on the side of the conductive plate 120 near the first arc-quenching grid group 410. An arc-strike gap is provided between the first arc-quenching grid group 410 and the fourth plate 512, so that the arc is quickly transferred from the fourth plate 512 to the first arc-quenching grid of the first arc-quenching grid group 410 during disconnection. The fourth plate 512 is separated from the static contact 110 by a certain distance d. Furthermore, the fourth plate 512 is aligned with the side of the conductive plate 120 near the first arc-quenching grid group 410, and its upper end is raised compared to the upper surface of the conductive plate 120, used for arc striking. Specifically, the static arc-striking piece 510 is formed by bending a metal plate with a thickness of about 2 mm to 3 mm in one piece. The static arc-striking piece 510 with such a thickness is not easily burned off.

[0030] In some embodiments of the present application, the distance d between the fourth plate 512 and the static contact 110 is ≥ 3 mm.

[0031] In some embodiments of the present application, the third plate 511 and the conductive plate 120 are fastened with screws to facilitate the fixation of the static arc-striking piece 510. The structure is simple and the problem of failure caused by the static arc-striking piece falling off during disconnection or life tests is solved.

[0032] Furthermore, the screw connecting the third plate 511 and the conductive plate 120 is located between the static contact 110 and the fourth plate 512 .

[0033] In some embodiments of the present application, the static contact 100 is fixed on the second insulating member 700, such as Figure 7 As shown, the second insulating member 700 includes a second insulating plate 710, the connecting plate 130 is fixed on the lower surface of the second insulating plate 710, and the second insulating plate 710 is provided with a through opening 711 for the conductive plate 120 to pass through, so that the conductive plate 120 is located above the second insulating plate 710 and the connecting plate 130 is located below the second insulating plate 710.

[0034] A first protrusion 720 and a second protrusion 730 are respectively provided at both ends of the second insulating plate 710. The first protrusion 720 is wrapped around the bent connection portion of the conductive plate 120 and the connecting plate 130, and the edge of the first protrusion 720 is close to the static contact 110. The second protrusion 730 is located on the side of the first plate body 521 away from the first arc-extinguishing grid group 410, and the upper end of the second protrusion 730 extends to the height position of the second arc-extinguishing grid group 420.

[0035] In some embodiments of the present application, the edge of the opening 711 is located below the first arc-quenching grid assembly 410, facilitating the installation of the static contact 100 and the static arc-striking plate 510. The second insulating member 700 includes a third insulating plate 740, which is fixed to the opening 711 to insulate and separate the first arc-quenching grid assembly 410 from the connecting plate 130. Furthermore, the area where the third insulating plate 740 is located overlaps the area where the third plate 511 is located, i.e., the left edge of the third insulating plate 740 is located to the left of the left edge of the third plate 511. Specifically, the third insulating plate 740 is sandwiched and fixed between the second insulating plate 710 and the connecting plate 130.

[0036] In some embodiments of the present application, the thickness of the first arc-extinguishing grid is greater than the thickness of the second arc-extinguishing grid, and the second arc-extinguishing grid is the thickness of a conventional arc-extinguishing grid. In order to arrange a larger number of arc-extinguishing grids, the first insulating member 600 is close to the conductive plate 120. In this way, the length of the first arc-extinguishing grid along the height direction is smaller. In order to ensure the burning resistance, the first arc-extinguishing grid is thickened. Therefore, the first arc-extinguishing grid is a special arc-extinguishing grid that is shorter and thicker than the conventional arc-extinguishing grid.

[0037] Preferably, the first insulating member 600 is arranged obliquely with the arc-out side facing upward, and the first arc-extinguishing grids of the first arc-extinguishing grid group 410 are distributed in an oblique line shape with the side away from the conductive plate 120 higher than the side close to the conductive plate 120, that is, of two adjacent first arc-extinguishing grids, the first arc-extinguishing grid away from the conductive plate 120 is higher than the first arc-extinguishing grid close to the conductive plate 120, so that a channel is formed between the first arc-extinguishing grid group 410 and the first insulating member 600, which is arranged obliquely with the arc-out side facing upward.

[0038] In some embodiments of the present application, the second arc-quenching grids are arranged obliquely, and the inclination of one or more second arc-quenching grids close to the first insulating member 600 is consistent with the inclination of the first insulating member 600, so as to arrange more second arc-quenching grids.

[0039] In some embodiments of the present application, the second arc-quenching grid group 420 has an L-shaped layout, comprising a third arc-quenching grid group 421 longitudinally arranged above the first insulating member 600, and a fourth arc-quenching grid group 422 transversely arranged from the upper end of the third arc-quenching grid group 421 toward the moving contact 200 in the open position. Specifically, the second arc-quenching grids constituting the third arc-quenching grid group 421 are arranged in parallel, and the second arc-quenching grids constituting the fourth arc-quenching grid group 422 are arranged in parallel, and the inclination of the fourth arc-quenching grid group 422 is greater than the inclination of the third arc-quenching grid group 421. The two groups are transitionally connected by a fifth arc-quenching grid group 423 arranged in a fan-shaped manner, that is, a certain angle is formed between adjacent arc-quenching grids in the fifth arc-quenching grid group 423.

[0040] In some embodiments of the present application, the moving arc-striking plate 530 includes a fifth plate 531 and a sixth plate 532, the fifth plate 531 is arranged obliquely and is adjacent to the fourth arc-extinguishing grid group 422, and the sixth plate 532 is connected to the lower end of the fifth plate 531 and extends longitudinally to a height corresponding to the moving contact 200 in the opening position.

[0041] In some embodiments of the present application, a narrow gap assembly is fixed between two oppositely arranged side plates 300, and the narrow gap assembly is composed of two gas-producing plates 800. The two gas-producing plates 800 are arranged at a certain interval to form a narrow gap space. The static contact 110 is fixed in the narrow gap space, and the moving contact 210 operates in the narrow gap space, so that the arc generated by the disconnection is generated in the narrow gap space between the two gas-producing plates 800, which is convenient for gas production and arc blowing.

[0042] In some embodiments of the present application, a magnetizing plate 810 is provided on the back side of the gas production plate 800, relative to the narrow gap, to help improve breaking capacity and electrical life performance. Specifically, a groove is provided on the back side of the gas production plate 800, relative to the narrow gap, that matches the shape of the magnetizing plate 810. The magnetizing plate 810 is embedded in the groove and retained in place by the side plate 300. Specifically, the gas production plate 800 and the side plate 300 are fastened together with screws, with the magnetizing plate 810 located between the gas production plate 800 and the side plate 300.

[0043] In some embodiments of the present application, Figure 10 As shown, the magnetizing plate 810 is arranged on one side of the gas producing plate 800 close to the moving contact 200 located at the opening position, so as to facilitate magnetization and guide the arc to move upward.

[0044] The arc extinguishing process of some embodiments of the present application is as follows: Figure 11 As shown, at the moment when the moving contact 200 and the static contact 100 are disconnected, the gap between the contacts is extremely small, the electric field strength instantly exceeds the breakdown threshold, the arc suddenly breaks out, the current quickly transfers from the contacts to the arc channel, quickly rises to the breakdown voltage, and quickly forms arc ①. As the moving contact 200 moves, the arc ① is elongated. Under the action of various iron parts and the electromagnetic field such as the narrow gap component and the static arc-starting piece on the right side of the static contact, the arc quickly moves to the arc extinguishing grid area, and enters the first arc extinguishing space below the first insulating member 600 and the second arc extinguishing space above the first insulating member 600, respectively. Figure 11 The direction of the arc ② is shown in the figure. As the moving contact 200 moves to the open position, more second arc extinguishing grids are introduced to participate in the arc extinguishing work, and finally form Figure 11 Schematic diagram of the direction of arc ③.

[0045] The above disclosure is merely a preferred embodiment of the present invention and certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. An arc extinguishing structure of a circuit breaker, characterized in that: include: A static contact (100) having a conductive plate (120), wherein a static contact point (110) is provided on an upper surface of the conductive plate (120); A moving contact (200) having a moving contact point (210) is located above the stationary contact (100) and is movable between a closing position and an opening position; A plurality of arc-extinguishing grids are distributed on one side of the static contact (100) and the movable contact (200), have an arc-entry side close to the static contact (100) and the movable contact (200) and an arc-exit side away from the static contact (100) and the movable contact (200), and include a plurality of first arc-extinguishing grids and a plurality of second arc-extinguishing grids; A first insulating member (600) is provided, wherein the first insulating member (600) is arranged higher than the conductive plate (120); A plurality of first arc-extinguishing grids are located in a first arc-extinguishing space formed below the first insulating member (600) and the end surface of the conductive plate (120), the first arc-extinguishing grids being arranged vertically or inclined relative to the vertical, and the plurality of first arc-extinguishing grids being sequentially distributed from the arc-entry side to the arc-exit side to form a first arc-extinguishing grid group (410); A plurality of second arc-extinguishing grids are located in a second arc-extinguishing space above the first insulating member (600), and the second arc-extinguishing grids are arranged in a transverse or oblique direction to form a second arc-extinguishing grid group (420).

2. The arc extinguishing structure of the circuit breaker according to claim 1, characterized in that: The first arc-extinguishing grid in the first arc-extinguishing space is arranged vertically or obliquely at an angle α relative to the vertical, where α is ≤ 30°.

3. The arc extinguishing structure of the circuit breaker according to claim 1, characterized in that: The first insulating member (600) is a first insulating partition arranged in a transverse or oblique direction, and a first notch (610) for guiding the arc to enter is provided on a side facing the moving contact (200).

4. The arc extinguishing structure of the circuit breaker according to claim 1, characterized in that: The first insulating member (600) is a first insulating partition arranged obliquely, with the side close to the arc-out side higher than the side close to the arc-in side; the first arc-extinguishing grids of the first arc-extinguishing grid group (410) are arranged in an oblique line shape, with the side close to the arc-out side higher than the side close to the arc-in side.

5. The arc extinguishing structure of the circuit breaker according to claim 1, characterized in that: The invention also includes a static arc-striking plate (510), wherein the static arc-striking plate (510) includes a third plate (511) and a fourth plate (512) connected by bending, wherein the third plate (511) is fastened to the lower surface of the conductive plate (120) by screws, and the fourth plate (512) is located at the end of the conductive plate (120), and the fourth plate (512) is separated from the static contact (110) by a certain distance d, and d≥3mm.

6. The arc extinguishing structure of the circuit breaker according to claim 5, characterized in that: The static arc-striking plate (510) is composed of a third plate (511) and a fourth plate (512); the fourth plate (512) is close to the end surface of the conductive plate (120); and a gap is provided between the first arc-extinguishing grid plate group (410) and the fourth plate (512).

7. The arc extinguishing structure of the circuit breaker according to claim 5, characterized in that: The screw connecting the third plate (511) and the conductive plate (120) is located between the static contact (110) and the fourth plate (512).

8. The arc extinguishing structure of the circuit breaker according to claim 5, characterized in that: The invention also includes an intermediate arc-striking plate (520), wherein the intermediate arc-striking plate (520) includes a first plate (521) and a second plate (522), wherein the first plate (521) is arranged vertically or obliquely, and the second plate (522) is arranged horizontally or obliquely, and the upper end of the first plate (521) is bent and connected to an end of the second plate (522) away from the moving contact (200), the first arc-extinguishing grid is distributed between the static arc-striking plate (510) and the first plate (521), the second plate (522) is located above the first insulating member (600), and the second arc-extinguishing grid is distributed above the second plate (522).

9. The arc extinguishing structure of the circuit breaker according to claim 8, characterized in that: It also includes a movable arc-striking piece (530), the movable arc-striking piece (530) being arranged close to the movable contact (200) located at the opening position, and the second arc-extinguishing grid piece being distributed between the second plate (522) and the movable arc-striking piece (530); The second arc-extinguishing grid group (420) is arranged in an L-shaped layout, comprising a third arc-extinguishing grid group (421) longitudinally distributed in sequence above the first insulating member (600) and a fourth arc-extinguishing grid group (422) transversely distributed in sequence from the upper end of the third arc-extinguishing grid group (421) toward the moving contact (200) located in the opening position. The second arc-extinguishing grids constituting the third arc-extinguishing grid group (421) are arranged in parallel, and the second arc-extinguishing grids constituting the fourth arc-extinguishing grid group (422) are arranged in parallel, and the two groups are transitionally connected by a fifth arc-extinguishing grid group (423) that is sequentially distributed in a fan-shaped manner.

10. The arc extinguishing structure of the circuit breaker according to claim 1, characterized in that: The static contact (100) comprises a connecting plate (130) and a terminal plate (140). The conductive plate (120), the connecting plate (130), and the terminal plate (140) are connected in sequence, and one end of the conductive plate (120) away from the first arc-extinguishing grid plate group (410) is bent and connected to the connecting plate (130), so that a height difference is formed between the two. A second insulating member (700) is provided. The second insulating member (700) is located between the connecting plate (130) and the first insulating member (600) and is spaced a certain distance from the first insulating member (600). The first insulating member (600), the side surface of the conductive plate (120), and the second insulating member (700) form a first arc-extinguishing space for accommodating the first arc-extinguishing grid plate group (410).

11. The arc extinguishing structure of the circuit breaker according to claim 10, characterized in that: The second insulating member (700) includes a second insulating plate (710), and the two ends of the second insulating plate (710) are respectively provided with a first protrusion (720) and a second protrusion (730), the first protrusion (720) is wrapped around the portion where the conductive plate (120) and the connecting plate (130) are bent and connected, and the edge of the first protrusion (720) is close to the static contact (110), and the second protrusion (730) is located on the side of the first plate body (521) away from the first arc extinguishing grid group (410), and the upper end of the second protrusion (730) extends to the first plate body (521). The second arc-extinguishing grid group (420) is located at a height position; the connecting plate (130) is fixed to the lower surface of the second insulating plate (710); the second insulating plate (710) is provided with a through opening (711) for the conductive plate (120) to pass through, and the edge of the through opening (711) is located below the first arc-extinguishing grid group (410); the second insulating member (700) includes a third insulating plate (740); the third insulating plate (740) is fixed at the through opening (711) to insulate and separate the first arc-extinguishing grid group (410) and the connecting plate (130).

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