Metal arc-extinguishing grid sheet, arc-extinguishing chamber and switch

Abstract

This utility model relates to the field of low-voltage electrical technology, and particularly to a metal arc-extinguishing grid, an arc-extinguishing chamber, and a switch. The metal arc-extinguishing grid has a ring-shaped projection on a preset plane. It has a first side and a second side arranged opposite to each other along a first direction parallel to the preset plane. When the metal arc-extinguishing grid is installed into the arc-extinguishing chamber, the first and second sides of the grid are respectively close to the inlet and outlet ends of the chamber. The current direction in the half-circle near the first side is opposite to that in the other half-circle near the second side. Therefore, the electromotive force generated by the two half-circles on the arc is opposite. The electromotive force generated by the half-circle near the first side points from the inlet end to the outlet end of the arc-extinguishing chamber, while the electromotive force generated by the half-circle near the second side points from the outlet end to the inlet end. This ensures that the arc force is always directed towards the inside of the grid, preventing arc overflow.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical technology, and in particular to a metal arc-extinguishing grid, an arc-extinguishing chamber, and a switch. Background Technology

[0002] The arc-extinguishing grid is a core component of the arc-extinguishing chamber, located within the arc-extinguishing cavity. The arc-extinguishing grid divides the electric arc entering the cavity, extinguishing it. Simultaneously, the metal arc-extinguishing grid generates an electrodynamic force in the magnetic field when the switch is opened, such as... Figure 1 As shown, the existing grid is a flat plate structure, which generates an electrodynamic force on the electric arc from the air inlet end to the air outlet end of the arc-extinguishing chamber. This electrodynamic force can be used to actively draw the electric arc into the gaps of the grid.

[0003] However, when the electric arc drawn into the grid gap moves at a high speed, the arc is prone to overflow from the grid gap, which can cause a short circuit. Utility Model Content

[0004] The first objective of this invention is to provide a metal arc-extinguishing grid to solve the technical problem in the prior art where, when the speed of the electric arc drawn into the grid gap is high, the electric arc easily overflows from the grid gap.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A metal arc-extinguishing grid, wherein the projection pattern of the metal arc-extinguishing grid on a preset plane is annular, and the metal arc-extinguishing grid has a first side and a second side disposed opposite to each other along a first direction, the first direction being parallel to the preset plane; When the metal arc-extinguishing grid is installed into the arc-extinguishing chamber, the first and second sides of the metal arc-extinguishing grid are close to the air inlet and air outlet of the arc-extinguishing chamber, respectively.

[0006] In some embodiments, the metal arc-quenching grid has a circular or elliptical annular structure; Alternatively, the metal arc-quenching grid has an N-sided ring structure, where N is greater than or equal to 3.

[0007] In some embodiments, the metal arc-quenching grid includes a first grid segment, a third grid segment, a second grid segment, and a fourth grid segment connected in sequence to form a closed loop, wherein the first grid segment and the second grid segment are disposed opposite to each other along the first direction.

[0008] In some embodiments, the projection pattern of the metal arc-quenching grid on the preset plane is a long ring shape, the length direction of the long ring shape is parallel to the first direction, and the first grid segment and the second grid segment respectively correspond to the two sides of the long ring shape along the length direction. And / or, the third gate segment and the fourth gate segment are both flat plate structures, and are arranged in parallel and spaced apart; And / or, the first gate segment is composed of a first straight segment and a first arc segment, and the two sides of the first straight segment are respectively connected to the third gate segment and the fourth gate segment through a first arc segment; And / or, the second gate segment is composed of a second straight segment and a second arc segment, with the two sides of the second straight segment respectively connected to the third gate segment and the fourth gate segment by a second arc segment.

[0009] In some embodiments, the metal arc-quenching grid has a groove on the side near the air inlet end, with the groove opening facing the air inlet end.

[0010] In some embodiments, the metal arc-extinguishing grid further includes a first sealing structure, which seals the gap between the inner ring region of the metal arc-extinguishing grid and the bottom wall of the groove; And / or, the metal arc-extinguishing grid further includes a second sealing structure, which seals the gap between the inner ring region of the metal arc-extinguishing grid and the sidewall of the groove.

[0011] The second objective of this utility model is to provide an arc-extinguishing chamber, which has an arc-extinguishing cavity, an air inlet end and an air outlet end, and the arc-extinguishing chamber further includes at least one metal arc-extinguishing grid as described in any of the above claims. The arc-extinguishing cavity is composed of a first region and a second region. The first part of the metal arc-extinguishing grid located in the first region and the second part of the metal arc-extinguishing grid located in the second region generate opposite electrodynamic forces on the electric arc. At the interface between the first region and the second region, the electromotive force of the first part on the arc is equal to the electromotive force of the second part on the arc.

[0012] In some embodiments, a groove is provided on the side of the metal arc-extinguishing grid near the air inlet end, the groove opening faces the air inlet end, and the grooves on multiple metal arc-extinguishing grids are connected sequentially to form a combined groove. The arc-extinguishing chamber also includes two gas-generating components, which are respectively wrapped around the two side walls of the combined tank.

[0013] In some embodiments, the arc-extinguishing chamber has an air outlet at its outlet end, and the arc-extinguishing chamber further includes an arc-extinguishing plate laid at the air outlet.

[0014] The third objective of this invention is to provide a switch comprising the arc-extinguishing chamber described in any of the preceding claims.

[0015] The beneficial effects of this utility model are: This utility model provides a metal arc-extinguishing grid, an arc-extinguishing chamber, and a switch. The projection pattern of the metal arc-extinguishing grid on a preset plane is an annular shape. The metal arc-extinguishing grid has a first side and a second side arranged opposite to each other along a first direction, which is parallel to the preset plane. When the metal arc-extinguishing grid is installed into the arc-extinguishing cavity of the arc-extinguishing chamber, the first side and the second side of the metal arc-extinguishing grid are close to the air inlet and air outlet of the arc-extinguishing cavity, respectively.

[0016] The current direction in the half-circle near the first side of the metal arc-extinguishing grid is opposite to that in the other half-circle near the second side. Therefore, the electromotive force generated by the two half-circles on the arc is opposite. The electromotive force generated by the half-circle near the first side on the arc is directed from the air inlet end to the air outlet end of the arc-extinguishing chamber, while the electromotive force generated by the half-circle near the second side on the arc is directed from the air outlet end to the air inlet end of the arc-extinguishing chamber. This ensures that the arc force is always directed towards the inside of the grid, avoiding the problem of arc overflow. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of a grid in the prior art; Figure 2 A three-dimensional schematic diagram of a metal arc-extinguishing grid sheet provided in one embodiment of the present invention; Figure 3 This is a schematic diagram of the metal arc-extinguishing grid plate provided in this embodiment of the present invention after being installed in the arc-extinguishing cavity; Figure 4 A three-dimensional schematic diagram of a metal arc-quenching grid sheet provided in another embodiment of the present invention; Figure 5 A three-dimensional schematic diagram of the arc-extinguishing chamber after removing one side plate and gas-generating component, provided for an embodiment of this utility model; Figure 6 for Figure 5 The front view; Figure 7 for Figure 5 A schematic diagram of the interface within the arc-extinguishing cavity in the illustrated embodiment.

[0019] icon: 1-Metal arc-extinguishing grid plate; 11-First grid segment; 12-Second grid segment; 13-Third grid segment; 14-Fourth grid segment; 15-Groove; 16-First sealing structure; 17-Second sealing structure; 2-Arc-extinguishing chamber; 21-First region; 22-Second region; 3-Inlet end; 4-Outlet end; 5-Combined groove; 6-Gas generating component; 7-Outlet hole; 8-Arc-extinguishing plate; 9-Arc-extinguishing chamber side plate; Q-Interface. Detailed Implementation

[0020] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] It should be noted that in the description of this utility model, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] It should be noted that in the description of this utility model, the terms "connection" and "installation" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or a connection through an intermediate medium; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0023] like Figure 1 As shown, the existing grid has a flat plate configuration, which generates an electrodynamic force on the electric arc from the inlet end to the outlet end of the arc-extinguishing chamber. However, when the speed of the electric arc drawn into the grid gap is high, the arc can easily escape from the grid gap, causing a short circuit problem.

[0024] Based on this, the first aspect of this application provides a metal arc-quenching grid 1, referring to... Figure 2 and Figure 3The projection pattern of the metal arc-extinguishing grid 1 on the preset plane is an annular configuration. The metal arc-extinguishing grid 1 has a first side and a second side arranged opposite to each other along a first direction, the first direction being parallel to the preset plane. When the metal arc-extinguishing grid 1 is installed into the arc-extinguishing cavity 2 of the arc-extinguishing chamber, the first side of the metal arc-extinguishing grid 1 ( Figure 3 (lower side) and second side ( Figure 3 The upper side of the cavity is close to the air inlet 3 and the air outlet 4 of the arc extinguishing chamber 2, respectively.

[0025] exist Figure 3 In the illustrated embodiment, when the contacts open, the generated arc enters the arc-extinguishing chamber and is cut by each of the metal arc-extinguishing grids 1, forming a parallel circuit within each metal arc-extinguishing grid 1, thereby generating current entering each metal arc-extinguishing grid 1. Since the metal arc-extinguishing grid 1 is annular, part of the current flows around the metal arc-extinguishing grid 1 from the upper side, while another part flows around the metal arc-extinguishing grid 1 from the lower side. Thus, the current directions of the upper and lower halves of the metal arc-extinguishing grid 1 are opposite, resulting in opposite electrodynamic forces generated by the upper and lower halves of the metal arc-extinguishing grid 1 on the arc. Different positions of the arc current within the grid gaps lead to different path lengths for the upper and lower halves of the metal arc-extinguishing grid 1, resulting in differences in the magnitude of the current in the upper and lower paths, which in turn affects the difference in the magnitude of the electrodynamic forces generated by the current in the upper and lower halves of the arc. Specifically, the electromotive force F1 generated by the lower half of the metal arc-extinguishing grid 1 on the electric arc points from the inlet end 3 to the outlet end 4 of the arc-extinguishing chamber 2, while the electromotive force F2 generated by the upper half of the metal arc-extinguishing grid 1 on the electric arc points from the outlet end 4 to the inlet end 3 of the arc-extinguishing chamber 2. Thus, there is an interface Q between the inlet end 3 and the outlet end 4 of the arc-extinguishing chamber 2. On the interface Q, the electromotive force F1 of the lower half of the metal arc-extinguishing grid 1 on the electric arc is equal to the electromotive force F2 of the upper half of the metal arc-extinguishing grid 1 on the electric arc. It can be understood that the interface Q is a virtual surface, and the interface Q can be any shape among a plane (ideally), a curved surface, a stepped surface, and an irregular surface.

[0026] Using the above technical solution, the arc-extinguishing chamber 2 is divided into a first region 21 and a second region 22 by the interface Q. The first part (i.e., the lower half) of the metal arc-extinguishing grid 1 located in the first region 21 and the second part (i.e., the upper half) of the metal arc-extinguishing grid 1 located in the second region 22 exert opposite electrodynamic forces on the electric arc. At the interface Q, the electrodynamic force exerted by the first part on the electric arc is equal to that of the second part (F1 = F2). When the electric arc moves from the inlet end 3 to the interface Q (i.e., the electric arc is in the first region 21), the resultant force of F1 and F2 (F1 > F2) on the electric arc points from the inlet end 3 to the outlet end 4; while when the electric arc moves from the interface Q to the outlet end 4 (i.e., the electric arc is in the second region 22), the resultant force of F1 and F2 (F1 < F2) on the electric arc points from the outlet end 4 to the inlet end 3. Thus, it is ensured that the force on the electric arc always points to the inside of the grid, avoiding the problem of the electric arc overflowing from the gaps in the grid.

[0027] Optionally, the metal arc-extinguishing grid 1 has a circular or elliptical ring structure; or, the metal arc-extinguishing grid 1 has an N-sided ring structure, where N is greater than or equal to 3. When the metal arc-extinguishing grid 1 has an N-sided ring structure, the metal arc-extinguishing grid 1 includes N grid segments connected end to end to form a closed loop. The number of grid segments constituting the metal arc-extinguishing grid 1 can be three, four, five, six, seven, eight, or more, as long as the number of grid segments is sufficient to form a closed loop.

[0028] In some embodiments, the metal arc-extinguishing grid 1 includes a first grid segment 11, a third grid segment 13, a second grid segment 12, and a fourth grid segment 14 connected sequentially to form a closed loop. The first grid segment 11 and the second grid segment 12 are disposed opposite to each other along a first direction. In the above embodiments, the metal arc-extinguishing grid 1 is composed of four grid segments connected end to end. The lower halves of the first grid segment 11, the third grid segment 13, and the fourth grid segment 14 constitute the first part of the metal arc-extinguishing grid 1, and the upper halves of the second grid segment 12, the third grid segment 13, and the fourth grid segment 14 constitute the second part of the metal arc-extinguishing grid 1.

[0029] In some embodiments, the projection pattern of the metal arc-extinguishing grid 1 on a preset plane is an elongated ring shape, the length direction of which is parallel to a first direction, and the first grid segment 11 and the second grid segment 12 respectively correspond to the two sides of the elongated ring shape along the length direction. By setting the metal arc-extinguishing grid 1 to an elongated ring shape, the thickness of the grid can be reduced, so that more grids can be arranged in the arc-extinguishing cavity 2.

[0030] In some embodiments, the third gate segment 13 and the fourth gate segment 14 are both flat plate structures and are arranged in parallel and spaced apart.

[0031] In some embodiments, the first gate segment 11 is composed of a first straight segment and a first arc segment, and the two sides of the first straight segment are respectively connected to the third gate segment 13 and the fourth gate segment 14 through a first arc segment.

[0032] In some embodiments, the second gate segment 12 is composed of a second straight segment and a second arc segment, and the two sides of the second straight segment are respectively connected to the third gate segment 13 and the fourth gate segment 14 through a second arc segment.

[0033] In this embodiment, the metal arc-extinguishing grid 1 is roughly rectangular ring-shaped, and the metal arc-extinguishing grid 1 is composed of four grid segments connected end to end, with rounded corners at the edges of the rectangular ring-shaped structure.

[0034] Continue to refer to Figure 2 The metal arc-extinguishing grid plate 1 has a groove 15 on the side near the air inlet end 3, and the groove opening of the groove 15 faces the air inlet end 3.

[0035] In some embodiments, the metal arc-extinguishing grid 1 further includes a first sealing structure 16, which seals the gap between the inner ring region of the metal arc-extinguishing grid 1 and the bottom wall of the groove 15.

[0036] In some embodiments, refer to Figure 4 The metal arc-extinguishing grid 1 also includes a second sealing structure 17, which seals the gap between the inner ring region of the metal arc-extinguishing grid 1 and the side wall of the groove 15.

[0037] The function of the first sealing structure 16 and the second sealing structure 17 is to seal the gap between the inner ring area of ​​the metal arc-extinguishing grid 1 and the groove wall of the groove 15, so as to prevent the electric arc from entering the inner ring area of ​​the metal arc-extinguishing grid 1 and causing damage to that area.

[0038] It should be noted that the metal arc-extinguishing grid 1 can be configured with either the first sealing structure 16 or the second sealing structure 17 (e.g., Figure 2 As shown), both can also be set simultaneously (e.g. Figure 4 (As shown).

[0039] A second aspect of this application provides an arc-extinguishing chamber, referring to... Figure 5 and Figure 6 The arc-extinguishing chamber has an arc-extinguishing cavity 2, the arc-extinguishing cavity 2 has an air inlet end 3 and an air outlet end 4, and the arc-extinguishing chamber includes at least one metal arc-extinguishing grid 1 as described in any of the above embodiments; combined with Figure 3The arc-extinguishing cavity 2 is composed of a first region 21 and a second region 22. The first part of the metal arc-extinguishing grid 1 located in the first region 21 and the second part of the metal arc-extinguishing grid 1 located in the second region 22 generate opposite electrodynamic forces on the electric arc. At the interface Q between the first region 21 and the second region 22, the electrodynamic force of the first part on the electric arc is equal to the electrodynamic force of the second part on the electric arc.

[0040] In an embodiment where the arc-extinguishing chamber includes multiple metal arc-extinguishing grid plates 1, the multiple metal arc-extinguishing grid plates 1 are sequentially arranged and installed inside the arc-extinguishing cavity 2.

[0041] Because the arc-extinguishing chamber is equipped with the aforementioned metal arc-extinguishing grid 1, it can ensure that the arc force is always directed towards the inside of the grid, avoiding the problem of the arc overflowing from the gaps in the grid, thereby reducing the arc discharged from the outlet end 4 of the arc-extinguishing chamber and alleviating the short circuit problem caused by the overflow of the arc.

[0042] It is understandable that the interface Q is composed of the sub-interfaces of the first and second parts of each metal arc-extinguishing grid 1 and the connecting surface between two adjacent sub-interfaces. The interface Q can be any shape among planar, curved, stepped, and irregular surfaces, and the specific shape of the interface Q will change according to the current flow direction and the arrangement of the metal arc-extinguishing grid 1. For example Figure 3 As shown, when multiple metal arc-extinguishing grid plates 1 are arranged side by side (i.e., the first side is flush and the second side is flush) and the current in each ring flows from the middle, the sub-interfaces of the first and second parts of each metal arc-extinguishing grid plate 1 are approximately on the same plane, so the interface Q is approximately planar at this time. Figure 6 and Figure 7 As shown, when multiple metal arc-extinguishing grid plates 1 are arranged unevenly, the sub-interfaces of the first and second parts of each metal arc-extinguishing grid plate 1 are not on the same plane, so the interface Q is a curved surface, a stepped surface or other irregular surface.

[0043] In some embodiments, the arc-extinguishing chamber further includes at least one flat arc-extinguishing grid (i.e., a conventional grid). The metal arc-extinguishing grid 1 and the flat arc-extinguishing grid 1 can be arranged alternately within the arc-extinguishing cavity 2, or several flat arc-extinguishing grid 1 can be arranged between two adjacent metal arc-extinguishing grid 1, or several metal arc-extinguishing grid 1 can be arranged between two adjacent flat arc-extinguishing grid 1. The arrangement of the two grid 1s can be arbitrarily adjusted.

[0044] Furthermore, referring to Figure 5 and Figure 6The arc-extinguishing chamber includes two arc-extinguishing chamber side plates 9, which are fastened together and enclose to form an arc-extinguishing cavity. The two ends of each metal arc-extinguishing grid plate 1 are respectively inserted into the two arc-extinguishing chamber side plates 9, so that the openings at both ends of each metal arc-extinguishing grid plate 1 are covered by the two arc-extinguishing chamber side plates 9.

[0045] Continue to refer to Figure 5 and Figure 6 The metal arc-extinguishing grid plate 1 has a groove 15 on the side near the air inlet end 3, and the groove opening of the groove 15 faces the air inlet end 3. The grooves 15 on multiple metal arc-extinguishing grid plates 1 are connected in sequence to form a combined groove 5. The arc-extinguishing chamber also includes two gas generating components 6, which are respectively covered on the two side walls of the combined groove 5.

[0046] Combination Figure 2 In one embodiment, the metal arc-extinguishing grid 1 is provided with only the first sealing structure 16 and not the second sealing structure 17, and the gap between its inner ring area and the side wall of the groove 15 is covered by the gas generating element 6.

[0047] As described above, by setting the two gas generating components 6 to cover the metal arc extinguishing grid 1, on the one hand, the relative position of the gas generating components 6 and each metal arc extinguishing grid 1 can be restricted, making the overall structure of the arc extinguishing chamber more robust; on the other hand, the gas generating components 6 can seal the gap between the inner ring area of ​​the metal arc extinguishing grid 1 and the side wall of the groove 15, preventing the electric arc from entering the inner ring area of ​​the metal arc extinguishing grid 1 and causing damage to that area.

[0048] Furthermore, the outlet end 4 of the arc-extinguishing chamber 2 has an outlet hole 7, and the arc-extinguishing chamber also includes an arc-extinguishing plate 8 laid at the outlet hole 7. The arc-extinguishing plate 8 is a plate-like structure with multiple through holes arrayed on its surface. The arc-extinguishing plate 8 can further prevent charged particles and electric arcs from escaping from the arc-extinguishing chamber 2. There can be one or more arc-extinguishing plates 8; when there are multiple arc-extinguishing plates 8, the multiple arc-extinguishing plates 8 are arranged in parallel, and the through holes on adjacent arc-extinguishing plates 8 can be staggered, which can improve the blocking effect on charged particles and electric arcs.

[0049] A third aspect of this application provides a switch comprising the arc-extinguishing chamber described in any of the above embodiments. This switch possesses at least all the technical effects of the aforementioned arc-extinguishing chamber, which will not be elaborated further here.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A metal arc-quenching grid, characterized in that, The projection pattern of the metal arc-extinguishing grid (1) on the preset plane is in the shape of a ring. The metal arc-extinguishing grid (1) has a first side and a second side arranged opposite to each other along a first direction, and the first direction is parallel to the preset plane. When the metal arc-extinguishing grid plate (1) is installed into the arc-extinguishing chamber (2) of the arc-extinguishing chamber, the first side and the second side of the metal arc-extinguishing grid plate (1) are close to the air inlet end (3) and the air outlet end (4) of the arc-extinguishing chamber (2), respectively.

2. The metal arc-quenching grid sheet according to claim 1, characterized in that, The metal arc-quenching grid (1) has a circular or elliptical ring structure; Alternatively, the metal arc-extinguishing grid (1) has an N-sided ring structure, where N is greater than or equal to 3.

3. The metal arc-quenching grid sheet according to claim 1, characterized in that, The metal arc-extinguishing grid (1) includes a first grid segment (11), a third grid segment (13), a second grid segment (12) and a fourth grid segment (14) connected in sequence to form a closed loop. The first grid segment (11) and the second grid segment (12) are arranged opposite to each other along the first direction.

4. The metal arc-quenching grid sheet according to claim 3, characterized in that, The projection pattern of the metal arc-extinguishing grid (1) on the preset plane is a long ring shape. The length direction of the long ring shape is parallel to the first direction. The first grid segment (11) and the second grid segment (12) correspond to the two sides of the long ring shape along the length direction, respectively. And / or, the third gate segment (13) and the fourth gate segment (14) are both flat plate structures and are arranged in parallel and spaced apart; And / or, the first gate segment (11) is composed of a first straight segment and a first arc segment, and the two sides of the first straight segment are respectively connected to the third gate segment (13) and the fourth gate segment (14) through a first arc segment. And / or, the second gate segment (12) is composed of a second straight segment and a second arc segment, and the two sides of the second straight segment are respectively connected to the third gate segment (13) and the fourth gate segment (14) through a second arc segment.

5. The metal arc-quenching grid according to claim 1, characterized in that, The metal arc-extinguishing grid plate (1) has a groove (15) on the side near the air inlet end (3), and the groove (15) faces the air inlet end (3).

6. The metal arc-quenching grid sheet according to claim 5, characterized in that, The metal arc-extinguishing grid (1) further includes a first sealing structure (16), which seals the gap between the inner ring region of the metal arc-extinguishing grid (1) and the bottom wall of the groove (15). And / or, the metal arc-extinguishing grid (1) further includes a second sealing structure (17), which seals the gap between the inner ring region of the metal arc-extinguishing grid (1) and the side wall of the groove (15).

7. An arc-extinguishing chamber, the arc-extinguishing chamber having an arc-extinguishing cavity (2), the arc-extinguishing cavity (2) having an air inlet (3) and an air outlet (4), characterized in that, It also includes at least one metal arc-quenching grid (1) as described in any one of claims 1 to 6. The arc-extinguishing cavity (2) is composed of a first region (21) and a second region (22). The first part of the metal arc-extinguishing grid plate (1) located in the first region (21) and the second part of the metal arc-extinguishing grid plate (1) located in the second region (22) generate opposite electrodynamic forces on the electric arc. At the interface (Q) between the first region (21) and the second region (22), the electromotive force of the first part on the arc is equal to the electromotive force of the second part on the arc.

8. The arc-extinguishing chamber according to claim 7, characterized in that, The metal arc-extinguishing grid plate (1) has a groove (15) on the side near the air inlet end (3), and the groove (15) faces the air inlet end (3). The grooves (15) on multiple metal arc-extinguishing grid plates (1) are connected in sequence to form a combined groove (5). The arc-extinguishing chamber also includes two gas-generating components (6), which are respectively covered on the two side walls of the combined groove (5).

9. The arc-extinguishing chamber according to claim 7, characterized in that, The arc-extinguishing chamber (2) has an air outlet (4) at its outlet (7), and the arc-extinguishing chamber also includes an arc-extinguishing plate (8) laid at the air outlet (7).

10. A switch, characterized in that, Includes the arc-extinguishing chamber as described in any one of claims 7 to 9.

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