Arc extinguish chamber and circuit breaker

Abstract

An arc extinguish chamber and a circuit breaker are provided, the circuit breaker is provided with the arc extinguish chamber, the arc extinguish chamber comprises two oppositely arranged mounting plates and a plurality of grid sheets arranged between the two mounting plates, at least part of the grid sheets are provided with two opposite legs at the arc inlet end of the arc extinguish chamber, an arc extinguish groove is arranged between the two legs, and the arc extinguish chamber is provided with a plurality of arc extinguish grooves. The two reflecting plates are mounted on the two mounting plates respectively, each reflecting plate comprises an outer side plate and an inner side plate, each inner side plate is provided with a first side edge connected with the corresponding outer side plate and a second side edge opposite to the first side edge, and a containing cavity is formed between each outer side plate and the corresponding inner side plate; the inner side plates of the two reflecting plates are inserted into the arc extinguishing grooves respectively, the containing cavities of the two reflecting plates are arranged on the two leg parts of at least part of the grid pieces in a sleeving mode respectively, the first side edges of the two inner side plates are in an arc shape, the middle portions of the first side edges protrude towards the sides close to the grid pieces, the reflecting plates can be matched with the motion trail of the moving contact, and therefore the moving contact can be fixed. And the electric arc is stably attracted to enter the arc extinguish chamber.

Description

Technical Field

[0001] The utility model relates to the field of low-voltage electrical appliances, and particularly relates to an arc extinguishing chamber and a circuit breaker. Background Art

[0002] Molded case circuit breakers usually adopt air-blowing or magnetic-blowing technology in cooperation with an arc extinguishing chamber to quickly introduce the arc into the arc extinguishing grids of the arc extinguishing chamber, which can accelerate the arc extinguishing speed. The air-blowing technology often uses gas-producing materials and is combined with a gradually shrinking arc channel (Laval nozzle) to achieve this. The key to the effect of this technical solution lies in increasing the air pressure difference between the front and rear ends of the arc extinguishing chamber.

[0003] However, in the existing technology, the reflector is vertically arranged with the grid, resulting in an increasing distance between the moving contact and the grid and the reflector during the breaking process, so that the arc extinguishing chamber cannot achieve the expected effect. In addition, the gradually shrinking arc channel is located in front of the contact position between the moving contact and the static contact, which will hinder the movement of compressed gas towards the arc extinguishing chamber, resulting in the improvement of the arc extinguishing ability not meeting the expectation. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome at least one defect of the existing technology and provide an arc extinguishing chamber.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme:

[0006] An arc extinguishing chamber includes two oppositely arranged mounting plates, and a plurality of grids arranged between the two mounting plates. At least part of the grids are provided with two opposite legs at the arc inlet end of the arc extinguishing chamber, and an arc extinguishing groove is arranged between the two legs. Two reflectors are respectively mounted on the two mounting plates. Each of the two reflectors includes an outer plate and an inner plate. The inner plate is provided with a first side connected to the outer plate and a second side opposite to the first side. The second side is spaced from the outer plate, and a receiving cavity is formed between the outer plate and the inner plate. The inner plates of the two reflectors are respectively inserted into the arc extinguishing grooves, and the receiving cavities of the two reflectors are respectively sleeved on the two legs of at least part of the grids. The first sides of the two inner plates are both arc-shaped, and the middle part of the first side bulges towards the side close to the grids.

[0007] Preferably, the middle part of the second side bulges towards the side close to the grids, and the second side and the first side are of the same arc shape.

[0008] Preferably, a front side plate is arranged at the connection between the inner plate and the outer plate, connected between the first side of the inner plate and the outer plate. The front side plate and the first side are of the same arc shape, and the receiving cavity is formed among the front side plate, the inner plate and the outer plate.

[0009] Preferably, the outer side surface of the inner plate far from the corresponding outer plate is of an arc shape.

[0010] Preferably, a transition surface in an arc surface shape is provided on the side of the front side plate close to the accommodation cavity, and both ends of the transition surface are respectively connected to the side surfaces of the inner side plate and the outer side plate.

[0011] Preferably, a notch is provided at one end of the second side edge close to the static contact, and the distance between the notches of the two reflector plates is greater than the distance between the second side plates of the two reflector plates.

[0012] Preferably, the side edge of the outer side plate close to the grid is convex towards the grid, so that the side edge of the outer side plate close to the grid has the same arc shape as the first side edge.

[0013] Preferably, the two reflector plates are respectively provided with partition plates, the partition plates are arranged outside the arc extinguishing chamber, and the mounting plates corresponding to the reflector plates are arranged on the same plane.

[0014] Preferably, a notch corresponding to the shape of the leg is provided on the side edge of the grid opposite to the side edge provided with the leg, and the notch is used to avoid the legs of other grids.

[0015] Preferably, an arcing plate is provided between the two mounting plates, the arcing plate includes an upper arcing part, a lower arcing part, and a middle arcing part connected between the upper arcing part and the lower arcing part, the middle arcing part is respectively arranged at an oblique angle with the upper arcing part and the lower arcing part, the upper arcing part is located at the top side of the arc extinguishing chamber, the lower arcing part is located between the partition plates of the two reflector plates, both ends of the lower arcing part are respectively located above the upper side plates of the two reflector plates, and a groove is provided in the middle of the lower arcing part.

[0016] Preferably, an arc isolating plate is provided on the side of the plurality of grids away from the reflector plate, and the arc isolating plate is mounted on the mounting plate.

[0017] Preferably, the arc isolating plate includes a plurality of layers of overlapping metal woven nets.

[0018] Preferably, the arc isolating plate is a metal plate, and a plurality of punching holes are provided on the metal plate.

[0019] Preferably, the metal plate is in a U shape or an S shape, and the metal plate is bent to form at least two overlapping parts, and at least two overlapping parts are overlapped.

[0020] Preferably, the bottom of the arc extinguishing groove on the grid is located on one side of its center line, and the arc extinguishing grooves of adjacent two grids are located on different sides of the center line.

[0021] Preferably, a convex platform is provided in the arc extinguishing groove, the convex platforms of adjacent two grids are arranged in a staggered manner, the convex platform is located on one side of the bottom of the arc extinguishing groove, and the other side of the bottom of the arc extinguishing groove is correspondingly arranged with the convex platform of the adjacent grid.

[0022] Preferably, in the cross-section where multiple grid plates are perpendicular to the grid plates and parallel to the outer side plates, the connecting line of the ends of the multiple grid plates close to the reflector forms the same arc as the first side edge.

[0023] Preferably, the partition plates of the two reflectors are inclined, and the distance between the two partition plates gradually increases in the direction close to the grid plates, so that the width of the air flow channel between the two partition plates gradually becomes wider in the direction close to the grid plates.

[0024] In the arc extinguishing chamber of the present utility model, by protruding the front side plate of the reflector towards the side close to the grid plates, the first side edges of the two inner side plates are arc-shaped, enabling the reflector to match the movement track of the moving contact. When the moving contact rotates around the rotating shaft, the distance D from the moving contact to the reflector can always remain consistent, thereby stably attracting the arc to move and enabling the arc to quickly enter the arc extinguishing chamber.

[0025] In addition, a transition surface with an arc shape is provided on the side of the front side plate close to the accommodation cavity. The two ends of the transition surface are respectively connected to the sides of the inner side plate and the outer side plate. The recoil air flow moves to the transition surface through the inclined inner side plate and then turns around through the arc-shaped transition surface, enabling the recoil air flow to quickly discharge from the accommodation cavity.

[0026] In addition, the cutouts of the two reflectors can increase the space between the two reflectors around the static contact, avoid excessive air flow resistance of the inner side plates of the reflectors, and facilitate the air flow to pass through between the two reflectors and enter the arc extinguishing chamber.

[0027] In addition, a closed structure can be formed by combining the arc ignition plate, the grid plates and the mounting plate to prevent the backflow of gas, arc and metal ions and ensure the effect of zero arc flash.

[0028] The present utility model also provides a circuit breaker, including a moving contact, a static contact, a moving contact blade, a rotating shaft and the arc extinguishing chamber as described in any one of the above. The moving contact is arranged on the moving contact blade, the moving contact blade is arranged on the rotating shaft, and the rotating shaft is used to drive the moving contact blade to rotate, so that the moving contact contacts and separates from the static contact. The movement track of the moving contact is the same arc as the first side edge in the arc extinguishing chamber. When the moving contact swings with the moving contact blade, the distance D from the moving contact to the first side edge remains unchanged.

[0029] In the circuit breaker of the present utility model, the movement track of the moving contact and the first side edge in the arc extinguishing chamber are the same arc, so that the distance D between the moving contact and the reflector always remains consistent, thereby stably driving the arc to move and improving the breaking capacity of the circuit breaker on the basis of improving the arc extinguishing ability. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic structural diagram of the molded case circuit breaker of the present utility model;

[0031] Figure 2 is a schematic structural diagram of the arc extinguishing chamber of the present utility model;

[0032] Figure 3 is an exploded view of the arc extinguishing chamber of the present utility model;

[0033] Figure 4 is a schematic diagram of the air flow in the arc extinguishing chamber of the present utility model;

[0034] Figure 5 is a schematic structural diagram of the reflector plate of the present utility model;

[0035] Figure 6 is a schematic structural diagram of the mounting plate of the present utility model;

[0036] Figure 7 is a schematic structural diagram of the first arc separating plate of the present utility model;

[0037] Figure 8 is a cross-sectional view of the first arc separating plate installed in the arc extinguishing chamber of the present utility model;

[0038] Figure 9 is a schematic structural diagram of the second arc separating plate of the present utility model;

[0039] Figure 10 is a cross-sectional view of the second arc separating plate installed in the arc extinguishing chamber of the present utility model;

[0040] Figure 11 is a schematic structural diagram of the grid plates of the present utility model;

[0041] In the figure, mounting plate 1; grid plates 3; legs 31; arc extinguishing grooves 32; notches 34; bosses 35; reflector plate 4; accommodation cavity 40; outer side plate 41; inner side plate 42; first side edge 421; second side edge 422; front side plate 43; transition surface 44; cutouts 45; upper side plate 46; slots 33; partition plates 47; mounting grooves 48; mounting posts 411; mounting holes 412; mounting protrusions 491; mounting grooves 492; moving contact 51; static contact 52; moving contact blade 53; insertion part 531; arc ignition part 532; rotating shaft 54; arc ignition plate 6; upper arc ignition part 61; lower arc ignition part 62; middle arc ignition part 63; arc separating plate 7; second mounting holes 12; third mounting holes 13; fourth mounting holes 14. Specific Embodiments

[0042] The following embodiments given in conjunction with the accompanying drawings further illustrate the specific embodiments of the arc extinguishing chamber of the present utility model. The arc extinguishing chamber of the present utility model is not limited to the descriptions of the following embodiments.

[0043] As Figure 2-3As shown in the figure, the arc extinguishing chamber of this embodiment includes two relatively arranged mounting plates 1, and a plurality of grid plates 3 arranged between the two mounting plates 1. At least part of the grid plates 3 are provided with two opposite legs 31 at the incoming arc end of the arc extinguishing chamber. An arc extinguishing groove 32 is provided between the two legs 31. Two reflecting plates 4 are respectively arranged on the two mounting plates 1. Each of the two reflecting plates 4 includes an outer plate 41 and an inner plate 42 arranged at an oblique angle. A receiving cavity 40 is formed between the outer plate 41 and the inner plate 42. The inner plates 42 of the two reflecting plates 4 are respectively inserted into the arc extinguishing grooves 32, and the receiving cavities 40 of the two reflecting plates 4 are respectively sleeved on the two legs 31 of at least part of the grid plates 3. That is, the receiving cavity 40 of one reflecting plate 4 is sleeved on the leg 31 on one side of the plurality of grid plates 3, and the receiving cavity 40 of the other reflecting plate 4 is sleeved on the leg 31 on the other side of the plurality of grid plates 3. The inner plate 42 is provided with a first side 421 connected to the outer plate 41 and a second side 422 opposite to the first side 421. The first side 421 is directly or indirectly connected to the outer plate 41, and the second side 422 is spaced from the outer plate 41, so that the receiving cavity 40 is formed between the outer plate 41 and the inner plate 42. The first sides 421 of the two inner plates 42 are both arc-shaped, and the middle of the first side 421 bulges towards the side close to the grid plate 3.

[0044] As Figure 1 shown in the figure, this embodiment also provides a molded case circuit breaker, which includes a moving contact 51, a static contact 52, a moving contact blade 53, a rotating shaft 54 and the arc extinguishing chamber. The moving contact 51 is arranged on the moving contact blade 53, the moving contact blade 53 is arranged on the rotating shaft 54, and the rotating shaft 54 is used to drive the moving contact blade 53 to rotate, so that the moving contact 51 contacts and separates from the static contact 52. The movement trajectory of the moving contact 51 is the same arc as the first side 421 in the arc extinguishing chamber. When the moving contact 51 swings with the moving contact blade 53, the distance D from the moving contact 51 to the first side 421 remains unchanged.

[0045] In the arc extinguishing chamber of this embodiment, by making the front side plate 43 of the reflecting plate 4 bulge towards the side close to the grid plate 3, the first sides 421 of the two inner plates 42 are arc-shaped, so that the reflecting plate 4 can match the movement trajectory of the moving contact 51. When the moving contact 51 rotates around the rotating shaft 54, the distance D from the moving contact 51 to the reflecting plate 4 can always remain the same, thereby stably attracting the arc to move and enabling the arc to quickly enter the arc extinguishing chamber.

[0046] In the molded case circuit breaker of this embodiment, the movement trajectory of the moving contact 51 and the first side 421 in the arc extinguishing chamber are the same arc, so that the distance D between the moving contact 51 and the reflecting plate 4 always remains the same, thereby stably driving the arc to move, and improving the breaking capacity of the circuit breaker on the basis of improving the arc extinguishing ability.

[0047] As Figure 4As shown, the reflector 4 is made of a gas-generating material. When the circuit breaker trips, the arc heats the surrounding air, causing the air to expand in all directions. The gas-generating material of the reflector 4 generates gas when heated. Part of the gas moves towards the grid plates 3, and the other part of the gas rushes towards the rear of the arc extinguishing chamber and is reflected back by the enclosed space formed by the base and the contact. Part of the gas rushes into the receiving cavity 40 of the two side reflectors 4. Since the inner plate 42 is inclined and the front side is provided with a transition surface 44 in the shape of an arc, the gas turns around along the arc of the front side and moves back towards the arc extinguishing chamber. At the same time, the inner plates 42 on both sides form a gradually narrowing arc contraction zone, and the second side 422 of the inner plate 42 and the mounting plate 1 form an arc expansion zone, making the air flow velocity faster at this position, so as to send the arc into the grid plates 3 faster. The receiving cavity 40 can also prevent the gas and the arc from flowing back.

[0048] As Figure 1 、 8 shown, in the cross-section of the multiple grid plates 3 perpendicular to the grid plates 3 and parallel to the outer side plate 41, the multiple grid plates 3 are arranged in a fan shape as a whole. The connection line of the ends of the multiple grid plates 3 close to the reflector 4 and the first side 421 are of the same arc shape, which can make the distance between the moving contact 51 and the grid plates 3 also consistent, further stabilizing the attraction of the arc to move. Of course, the grid plates 3 can also be arranged in parallel and in a fan shape, which all fall within the protection scope of the present utility model.

[0049] As Figure 2-5 shown, in this embodiment, each reflector 4 includes an outer side plate 41, an inner side plate 42 and a partition plate 47. The inner side plate 42 is inclinedly connected to the outer side plate 41 through the first side 421, and an approximately V-shaped receiving cavity 40 is formed between the inner side plate 42 and the outer side plate 41. The receiving cavity 40 is sleeved at the end of the leg 31 of the grid plate 3. The partition plate 47 is connected to the outer side plate 41. The partition plate 47 is arranged outside the arc extinguishing chamber and is on the same plane as the corresponding mounting plate 1 of the reflector 4, which is used to increase the gas and guide the arc; of course, as other embodiments, the partition plate 47 can also be not provided. Further, the inner side surface of the inner side plate 42 and the outer side plate 41 form the receiving cavity 40, and the outer side surface of the inner side plate 42 far from the corresponding outer side plate 41 is in the shape of an arc, which is beneficial to guiding the arc. It should be noted that the two reflectors 4 in this embodiment are separately arranged. As other embodiments, the two reflectors 4 can also be integrally arranged, for example, connected by a bottom plate at the base of the arc extinguishing chamber, or connected by an arc guiding plate 6 at the top of the arc extinguishing chamber, etc.

[0050] Furthermore, the two partition plates 47 are inclined, and the inclination directions of the partition plates 47 and the inner side plates 42 on the same side are opposite. The distance between the two partition plates 47 gradually increases in the direction close to the grid piece 3, and the width of the air flow channel between the two partition plates 47 gradually becomes wider in the direction close to the grid piece 3. The air flow channel first widens between the partition plates 47 and then narrows between the inner side plates 42, which can make the air flow more easily approach the narrowest position of the inner side plates 42 and accelerate the air flow movement speed.

[0051] As Figure 2 shown, the inner side plate 42 is provided with a second side 422 opposite to the first side 421. The second side 422 is spaced from the outer side plate 41. The middle of the second side 422 protrudes toward the side close to the grid piece 3. The second side 422 and the first side 421 are of the same arc shape, which can make the distance from the moving contact 51 to the second side 422 always remain the same, and then stably attract the arc to move, so that the arc quickly enters the arc extinguishing chamber. As Figure 5 shown, at the connection between the inner side plate 42 and the outer side plate 41 in this embodiment, there is a front side plate 43. The front side plate 43 is connected between the first side 421 of the inner side plate 42 and the outer side plate 41. The front side plate 43 and the first side 421 are of the same arc shape. The inner side plate 42 and the outer side plate 41 are connected through the front side plate 43. The accommodation cavity 40 is formed among the front side plate 43, the inner side plate 42 and the outer side plate 41. The side of the front side plate 43 close to the accommodation cavity 40 is provided with a transition surface 44 in an arc shape. The two ends of the transition surface 44 are respectively connected to the sides of the inner side plate 42 and the outer side plate 41. The recoil air flow moves to the transition surface 44 through the inclined inner side plate 42 and then turns around through the arc-shaped transition surface 44, so that the recoil air flow quickly discharges from the accommodation cavity 40.

[0052] It can be understood that the front side plate 43 may not be provided. The inner side plate 42 and the outer side plate 41 may be directly connected. The inner side of the connection part may be processed with a transition surface 44 in an arc shape, or may not be processed with an arc surface. For example, it may adopt a V-shaped, flat-shaped or other shapes, which all belong to the protection scope of the present invention.

[0053] As Figure 5 shown, at one end of the second side 422 close to the static contact 52, there is a notch 45. The notch 45 is provided with a notch surface inclined to the second side 422. The distance between the notches 45 of the two reflector plates 4 is greater than the distance between the second sides 422 of the two reflector plates 4. The notch surface can increase the space between the two reflector plates 4 around the static contact 52, avoid excessive air flow resistance of the inner side plate 42 of the reflector plate 4, and facilitate the air flow to pass through between the two reflector plates 4 and enter the arc extinguishing chamber. Of course, the notch 45 may also adopt other shapes, such as an arc shape or an L-shaped shape, which all belong to the protection scope of the present invention.

[0054] Further, an upper side plate 46 is provided at one end of the front side plate 43, the inner side plate 42 and the outer side plate 41 away from the static contact 52. The upper side plate 46 is connected between the front side plate 43, the inner side plate 42 and the outer side plate 41. An accommodation cavity 40 is formed among the upper side plate 46, the front side plate 43, the inner side plate 42 and the outer side plate 41. The formation of the accommodation cavity 40 by the upper side plate 46 facilitates the flow of air, enables the air to be quickly discharged from the accommodation cavity 40, and prevents the air from staying in the accommodation cavity 40.

[0055] Further, the plurality of grid plates 3 are respectively provided with slots 33 for inserting the outer side plates 41 on the outer sides of their respective two legs 31, so that the outer side plates 41 of the two reflector plates 4 can be inserted between the two legs 31 of the grid plates 3 and the two side mounting plates 1. The side of the outer side plate 41 close to the grid plate 3 protrudes towards the grid plate 3, so that the side of the outer side plate 41 close to the grid plate 3 and the first side 421 are of the same arc shape.

[0056] Further, the two reflector plates 4 are respectively provided with partition plates 47. The partition plates 47 are arranged outside the arc extinguishing chamber and are in the same plane as the mounting plates 1 corresponding to the reflector plates 4. The partition plates 47 of the reflector plates 4 are connected to the outer side plates 41. An installation groove 48 is provided at the connection of the partition plate 47 and the outer side plate 41. The installation groove 48 is used for being stuck on the mounting plate 1. The installation groove 48 is provided with an installation protrusion 491 protruding towards the mounting plate 1. The side of the mounting plate 1 is provided with an installation groove 492 for sleeving on the installation protrusion 491 for limiting.

[0057] As Figure 5-6 shown, the outer side plate 41 is provided with three mounting posts 411, and the mounting plate 1 is provided with three mounting holes 412 for respectively inserting the mounting posts 411. The reflector plate 4 is mounted on the mounting plate 1 through the outer side plate 41, and there is no need to mount the reflector plate 4 on the grid plate 3.

[0058] As Figure 2 shown, an arcing plate 6 is provided between the two mounting plates 1. The arcing plate 6 includes an upper arcing part 61, a lower arcing part 62, and a middle arcing part 63 connecting the upper arcing part 61 and the lower arcing part 62. The middle arcing part 63 is respectively arranged at an oblique angle with the upper arcing part 61 and the lower arcing part 62. The upper arcing part 61 is located at the top side of the arc extinguishing chamber. The lower arcing part 62 is located between the partition plates 47 of the two reflector plates 4. Both ends of the lower arcing part 62 are respectively located above the upper side plates 46 of the two reflector plates 4. A groove is provided in the middle of the lower arcing part 62. The arcing plate 6, the grid plates 3 and the mounting plate 1 can form a closed structure to prevent the backflow of gas, arc and metal ions and ensure the effect of zero arc flash.

[0059] As Figure 6-8As shown, on the side of the multiple grid plates 3 away from the reflector 4, there is an arc separating plate 7. The arc separating plate 7 is installed on the mounting plate 1. The arc separating plate 7 includes multiple layers of overlapping metal braided nets. Metal ions can only pass through the gaps formed by the multiple layers of metal braided nets, enabling these free high-temperature metal ions to be adsorbed on the arc separating plate 7 during their travel. The arc separating plate 7 absorbs the free metal particles to prevent the free metal particles from escaping from the arc extinguishing chamber. The mounting plate 1 is provided with a second mounting hole 12 for mounting the arc separating plate 7, a third mounting hole 13 for mounting the grid plates 3, and a fourth mounting hole 14 for mounting the arc leading plate 6.

[0060] As Figure 9-10 shown, as another embodiment of the arc separating plate 7, the arc separating plate 7 is a metal plate, and the metal plate is provided with multiple punching holes. Preferably, the metal plate is in a U shape or an S shape, and the metal plate is bent to form at least two overlapping portions, and the at least two overlapping portions are overlapped. Alternatively, multiple such metal plates are provided and the multiple metal plates are overlapped, which all fall within the protection scope of the present utility model.

[0061] As Figure 11 shown, on the side of the grid plate 3 opposite to the side where the leg 31 is provided, there is a notch 34 corresponding to the shape of the leg 31. The notch 34 is used to avoid the legs 31 of other grid plates 3, so that multiple grid plates 3 can be placed more concentratedly for blanking, reducing the waste of materials.

[0062] As Figure 3 shown, the bottom of the arc extinguishing groove 32 on the grid plate 3 is located on one side of its center line, and the arc extinguishing grooves 32 of two adjacent grid plates 3 are located on different sides of the center line, which can reduce the number of grid plates 3 contacted by the arc when entering the arc extinguishing chamber, and further reduce the resistance suffered by the arc.

[0063] Further, a boss 35 is provided in the arc extinguishing groove 32. The bosses 35 of two adjacent grid plates 3 are arranged in a staggered manner. The boss 35 is located on one side of the bottom of the arc extinguishing groove 32, and the other side of the bottom of the arc extinguishing groove 32 is correspondingly arranged with the boss 35 of the adjacent grid plate 3, so as to further reduce the resistance of the grid plate 3 to the arc.

[0064] As Figure 1 shown, the moving contact 51 is located outside the arc extinguishing chamber. The moving contact blade 53 is provided with an insertion portion 531 inserted into the arc extinguishing chamber. An arc leading portion 532 is provided on the side of the insertion portion 531 away from the static contact 52, and the arc leading portion 532 can be inserted into the inner side of the arc leading plate 6.

[0065] It should be noted that in the description of the present utility model, the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which it is customarily placed during use. It is only for the convenience of description and does not indicate that the device or component referred to must have a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, terms such as "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be construed as indicating relative importance.

[0066] The above content is a further detailed description of the present utility model in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present utility model is only limited to these descriptions. For those of ordinary skill in the technical field to which the present utility model belongs, without departing from the concept of the present utility model, several simple deductions or substitutions can still be made, and all should be regarded as belonging to the protection scope of the present utility model.

Claims

1. An arc extinguishing chamber, comprising two mounting plates (1) arranged opposite to each other, and a plurality of grid plates (3) arranged between the two mounting plates (1), at least part of the grid plates (3) being provided with two opposite legs (31) at an arc inlet end of the arc extinguishing chamber, an arc extinguishing groove (32) being provided between the two legs (31), two reflecting plates (4) being respectively mounted on the two mounting plates (1), the two reflecting plates (4) each comprising an outer plate (41) and an inner plate (42), the inner plate (42) being provided with a groove for contacting with the outer plate (41). 1) and a first side edge (421) connected to the first side edge (421), and a second side edge (422) opposite to the first side edge (421), the second side edge (422) and the outer side edge (41) are arranged at intervals, and a receiving cavity (40) is formed between the outer side edge (41) and the inner side edge (42), the inner side edges (42) of the two reflecting plates (4) are respectively inserted into the arc extinguishing groove (32), and the receiving cavities (40) of the two reflecting plates (4) are respectively covered on the two legs (31) of the at least part of the grid plate (3), characterized in that: The first side edges (421) of the two inner plates (42) are both arc-shaped, and the middle portion of the first side edges (421) protrudes toward a side close to the grid plate (3).

2. The arc extinguishing chamber according to claim 1, characterized in that: The middle portion of the second side edge (422) is convex toward the side close to the grid plate (3), and the second side edge (422) and the first side edge (421) are in the same arc shape.

3. The arc extinguishing chamber according to claim 1, characterized in that: A front side plate (43) is provided at the connection between the inner side plate (42) and the outer side plate (41), and is connected between the first side edge (421) of the inner side plate (42) and the outer side plate (41); the front side plate (43) and the first side edge (421) are arc-shaped with the same shape; and the accommodating cavity (40) is surrounded by the front side plate (43), the inner side plate (42) and the outer side plate (41).

4. The arc extinguishing chamber according to claim 1, characterized in that: The outer side surface of the inner plate (42) away from the corresponding outer plate (41) is in a curved shape.

5. The arc extinguishing chamber according to claim 3, characterized in that: The side surface of the front side plate (43) close to the accommodating cavity (40) is provided with a transition surface (44) in the shape of an arc surface, and the two ends of the transition surface (44) are respectively connected to the side surfaces of the inner side plate (42) and the outer side plate (41).

6. The arc extinguishing chamber according to claim 2, characterized in that: The second side edge (422) is provided with a cutout (45) at one end close to the static contact (52), and the distance between the cutouts (45) of the two reflection plates (4) is greater than the distance between the second side plates of the two reflection plates (4).

7. The arc extinguishing chamber according to claim 1, characterized in that: The side edge of the outer plate (41) close to the grid sheet (3) is convex in a direction close to the grid sheet (3), so that the side edge of the outer plate (41) close to the grid sheet (3) and the first side edge (421) are in the same arc shape.

8. The arc extinguishing chamber according to claim 1, characterized in that: The two reflecting plates (4) are respectively provided with a partition plate (47), and the partition plate (47) is arranged outside the arc extinguishing chamber and is arranged on the same plane as the mounting plate (1) corresponding to the reflecting plate (4).

9. The arc extinguishing chamber according to claim 1, characterized in that: A notch (34) corresponding to the shape of the leg (31) is provided on the side of the grid sheet (3) opposite to the side on which the leg (31) is provided, and the notch (34) is used to avoid the leg (31) of other grid sheets (3).

10. The arc extinguishing chamber according to claim 1, characterized in that: An arc-striking plate (6) is provided between the two mounting plates (1), the arc-striking plate (6) comprising an upper arc-striking portion (61) and a lower arc-striking portion (62), and a middle arc-striking portion (63) connected between the upper arc-striking portion (61) and the lower arc-striking portion (62), the middle arc-striking portion (63) being arranged at an oblique angle to the upper arc-striking portion (61) and the lower arc-striking portion (62), the upper arc-striking portion (61) being located at the top side of the arc-extinguishing chamber, the lower arc-striking portion (62) being located between the partitions (47) of the two reflecting plates (4), the two ends of the lower arc-striking portion (62) being respectively located above the upper side plates (46) of the two reflecting plates (4), and a groove being provided in the middle of the lower arc-striking portion (62).

11. The arc extinguishing chamber according to claim 1, characterized in that: An arc isolation plate (7) is provided on one side of the plurality of grid plates (3) away from the reflector plate (4), and the arc isolation plate (7) is mounted on the mounting plate (1).

12. The arc extinguishing chamber according to claim 11, characterized in that: The arc isolation plate (7) comprises multiple layers of overlapping metal woven meshes.

13. The arc extinguishing chamber according to claim 11, characterized in that: The arc isolation plate (7) is a metal plate, and a plurality of punched holes are provided on the metal plate.

14. The arc extinguishing chamber according to claim 13, characterized in that: The metal plate is U-shaped or S-shaped, and is bent to form at least two overlapping portions, and the at least two overlapping portions are arranged in an overlapping manner.

15. The arc extinguishing chamber according to claim 1, characterized in that: The bottom of the arc extinguishing groove (32) on the grid piece (3) is located on one side of the center line thereof, and the arc extinguishing grooves (32) of two adjacent grid pieces (3) are located on different sides of the center line.

16. The arc extinguishing chamber according to claim 1, characterized in that: A boss (35) is provided in the arc extinguishing groove (32), and the bosses (35) of two adjacent grid plates (3) are arranged in a staggered manner. The boss (35) is located on one side of the bottom of the arc extinguishing groove (32), and the other side of the bottom of the arc extinguishing groove (32) is arranged correspondingly to the boss (35) of the adjacent grid plate (3).

17. The arc extinguishing chamber according to claim 1, characterized in that: In a cross section where the plurality of grid plates (3) are perpendicular to the grid plates (3) and parallel to the outer plate (41), a line connecting the ends of the plurality of grid plates (3) close to the reflective plate (4) and the first side edge (421) are in the same arc shape.

18. The arc extinguishing chamber according to claim 8, characterized in that: The partitions (47) of the two reflective plates (4) are arranged obliquely, and the distance between the two partitions (47) gradually increases in a direction approaching the grid plate (3), so that the width of the airflow channel between the two partitions (47) gradually widens in a direction approaching the grid plate (3).

19. A circuit breaker, characterized in that: It comprises a moving contact (51), a stationary contact (52), a moving contact blade (53), a rotating shaft (54) and an arc extinguishing chamber as described in any one of claims 1 to 18, wherein the moving contact (51) is arranged on the moving contact blade (53), the moving contact blade (53) is arranged on the rotating shaft (54), the rotating shaft (54) is used to drive the moving contact blade (53) to rotate, so that the moving contact (51) and the stationary contact (52) are in contact with and separated from each other, the movement trajectory of the moving contact (51) is the same arc as the first side (421) in the arc extinguishing chamber, and when the moving contact (51) swings with the moving contact blade (53), the distance from the moving contact (51) to the first side (421) remains unchanged.

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