Arc extinguish chamber

Abstract

An arc extinguish chamber comprises an arc extinguish cavity and at least one grid piece group, the grid piece group comprises a plurality of arc extinguish grid pieces arranged in the arc extinguish cavity at intervals, an arc extinguish gap is formed between every two adjacent arc extinguish grid pieces, and an arc extinguish notch is formed in the gap between two supporting legs of each arc extinguish grid piece. The arc extinguishing cavity comprises a gas generating piece and an arc isolating piece, a plurality of mounting grooves are formed in one side, facing the grid piece group, of the gas generating piece, and the mounting grooves are used for being matched with the outer edges of the arc extinguishing grid pieces in a limiting manner; and the arc isolating piece is arranged along the inner side of the arc extinguishing groove and is buckled with the adjacent gas generating piece so as to be matched with and limit the arc extinguishing grid piece. According to the arc extinguishing chamber, the mounting groove of the gas generating part is used for being in limiting fit with the outer side edge of the arc extinguishing grid piece, the arc isolating part and the gas generating part are buckled to jointly limit the arc extinguishing grid piece, the gas generating part can replace a side plate of an existing arc extinguishing chamber, the number of parts can be reduced, the assembling process can be simplified, and it can be guaranteed that the gas generating part and the arc extinguishing grid piece are stably matched.

Description

Technical Field

[0001] The invention relates to the field of low-voltage electrical appliances, and in particular to an arc extinguishing chamber. Background Art

[0002] A circuit breaker is a device that plays an electrical protection role in a circuit. During the breaking process, the air medium between the moving and static contacts discharges under the action of voltage, thereby generating an arc, and high-temperature gas is generated during the breaking process. An arc extinguishing chamber is usually configured in the circuit breaker to extinguish the arc. As an important component of the circuit breaker, the arc extinguishing ability of the arc extinguishing chamber directly determines the breaking capacity and electrical life of the entire circuit breaker.

[0003] At present, the arc extinguishing chamber mainly relies on the magnetic field generated by the electric circuit to drive the arc into the arc extinguishing chamber, and uses the grid group in the arc extinguishing chamber to cut the long arc into multiple short arcs, thereby increasing the arc voltage to extinguish the arc. However, the existing arc extinguishing chamber has the following defects: First, the arc extinguishing chamber has a complex structure. When assembling the arc extinguishing chamber, the gas-generating parts, arc-extinguishing grids, etc. need to be fixed on the side panels separately. The assembly process is cumbersome and it is also easy to cause poor coordination between the gas-generating parts and the arc-extinguishing grids; second, after the arc enters the grid group, the arc in its leg area is difficult to eliminate. Summary of the invention

[0004] The object of the present invention is to overcome at least one defect of the prior art and provide an arc extinguishing chamber with simple structure and high reliability.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] The present invention provides an arc extinguishing chamber, comprising an arc extinguishing cavity and at least one grid group, wherein the grid group comprises a plurality of arc extinguishing grids spaced apart in the arc extinguishing cavity, an arc extinguishing gap is formed between two adjacent arc extinguishing grids, an arc extinguishing notch is formed between two legs of each arc extinguishing grid, the arc extinguishing notches of a plurality of arc extinguishing grids are connected to form an arc extinguishing groove, the arc extinguishing cavity comprises a gas producing part and an arc isolating part, a plurality of mounting grooves are arranged on a side of the gas producing part facing the grid group, the mounting grooves are used to cooperate with the outer edge limiting position of the arc extinguishing grid, the arc isolating part is arranged along the inner side of the arc extinguishing groove and is buckled with the adjacent gas producing part to cooperate with the limiting arc extinguishing grid.

[0007] Preferably, a mutually cooperating snap-fitting structure is arranged between the arc-isolating member and the adjacent gas-producing member, and the snap-fitting structure includes at least one pair of mutually cooperating positioning portions and limiting portions, the positioning portion is arranged at a position of the arc-isolating member close to the edge, and the limiting portion is arranged on the side of the gas-producing member facing away from the arc-extinguishing grid.

[0008] Preferably, the edge of the arc-isolating member extends along the end of the leg toward the adjacent gas-producing member to form a closed portion, so that the arc-isolating member cooperates with the adjacent gas-producing member to form a gas-producing cavity for limiting and wrapping the leg.

[0009] Preferably, a clamping table as a first limiting portion is provided on the middle edge of the closed portion, and a clamping hook as a second limiting portion is respectively provided on the two end edges of the closed portion, and three clamping grooves are provided on the side of the gas producing part facing away from the arc extinguishing grid, one of the clamping grooves is clamped with the clamping table as a first positioning portion, and the remaining two clamping grooves are clamped with two second limiting portions respectively as second positioning portions.

[0010] Preferably, a plurality of spaced-apart ribs are provided on the side of the gas-generating member facing the arc-isolating member, each of the spacers being located between two adjacent arc-extinguishing grids, and the edge connected between the two ends of the spacers is spaced opposite to the arc-isolating member and forms an airflow runway corresponding to the legs.

[0011] Preferably, the protruding heights of each partition rib are not completely equal, and the distances from the edge connected between the two ends of the partition rib to the arc isolation piece are not completely equal, so that the inner diameters of each section of the airflow runway are not completely equal.

[0012] Preferably, one end of each airflow runway has the largest inner diameter, and the other end of the airflow runway has the smallest inner diameter and corresponds to the area of ​​the support leg close to the end.

[0013] Preferably, the edge cross-sectional line connected between the two ends of each rib is one or a combination of an oblique line, an arc line and a fold line, or the edge cross-sectional line is a combination of a straight line and an arc line and / or an oblique line, so that the inner diameter of the airflow runway changes gradually.

[0014] Preferably, the edge cross-section line connected between the two ends of each rib is a step-shaped broken line.

[0015] Preferably, each barrier rib includes at least two barriers, and two adjacent barriers are stacked in a direction parallel to the plane where the arc-extinguishing grid is located. The edge cross-sectional line of each barrier layer is one or a combination of more than one of an oblique line, an arc line and a fold line, or the edge cross-sectional line is a combination of a straight line and an arc line and / or an oblique line.

[0016] Preferably, the edge cross-sectional line of at least one partition is a step-shaped fold line.

[0017] Preferably, the inner diameter of the middle section of each airflow runway is smaller than the inner diameter of the two end sections of the airflow runway, so that the airflow runway is in the shape of a Laval nozzle.

[0018] Preferably, the edge cross-sectional line connecting the two ends of the rib is an arc line, or a combination of a straight line and an arc line, or a combination of a straight line and an oblique line.

[0019] Preferably, the second limiting portion includes an extension portion, which extends along a side parallel to the gas producing part facing away from the arc extinguishing grid, and is bent from one end of the extension portion away from the closed portion toward the direction close to the gas producing part to form a hook portion, and the side of the hook portion facing away from the closed portion is a matching inclined surface.

[0020] Preferably, one end of the arc extinguishing cavity opposite to the open opening is closed as a closed end, and the closed end is provided with a plurality of through holes arranged at intervals, each through hole is respectively connected to a partial area of ​​an arc extinguishing gap, and two adjacent through holes are arranged in a staggered manner.

[0021] Preferably, the arc extinguishing groove is opposite to the opening of the arc extinguishing cavity, one end of the arc extinguishing gap is connected to the opening of the arc extinguishing cavity, and the angle between the central axis of each arc extinguishing gap and the central axis of the opening is in the range of 0 to 45°.

[0022] In the arc extinguishing chamber of the present invention, the mounting groove of the gas producing part is used to cooperate with the outer edge of the arc extinguishing grid, the arc isolation part and the gas producing part are buckled to jointly limit the arc extinguishing grid, and the gas producing part can replace the side plate of the existing arc extinguishing chamber, which can not only reduce the number of parts and simplify the assembly process, but also ensure the stable cooperation between the gas producing part and the arc extinguishing grid.

[0023] In addition, the arc-isolating member and the gas-producing member cooperate to form a gas-producing cavity for wrapping the supporting leg, and an airflow track corresponding to the supporting leg is formed between the partition ribs of the gas-producing member and the arc-isolating member, so that the electric arc is pushed into the airflow track to be cooled and cut, which is conducive to extinguishing the arc at the supporting leg.

[0024] In addition, the inner diameters of the various sections of the airflow runway are not completely equal. By changing the inner diameter of the airflow runway, the flow velocity of the gas in the airflow runway is changed, which is beneficial to arc extinguishing. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the arc extinguishing chamber of the present invention;

[0026] Figure 2 is an exploded schematic diagram of the arc extinguishing chamber of the present invention;

[0027] Figure 3 It is a schematic diagram of the structure of the arc separation member in the present invention;

[0028] Figure 4 It is a schematic diagram of the structure of the gas generating component in the present invention;

[0029] Figure 5 It is a cross-sectional view of the partition rib and the airflow runway of the present invention (the first structure);

[0030] Figure 6 yes Figure 5 Schematic diagram of the structure of the gas-producing parts;

[0031] Figure 7is a cross-sectional view of the partition ribs and the airflow runway of the present invention (the second structure);

[0032] Figure 8 yes Figure 7 Schematic diagram of the structure of the gas-producing parts;

[0033] Fig. 9 is a cross-sectional view of the partition ribs and the airflow runway of the present invention (third structure);

[0034] Fig.10 yes Fig. 9 Schematic diagram of the structure of the gas-producing parts;

[0035] Fig.11 is a cross-sectional view of the partition ribs and the airflow runway of the present invention (the fourth structure);

[0036] Fig.12 yes Fig.11 Schematic diagram of the structure of the gas-producing parts;

[0037] Fig.13 yes Fig.12 A partial enlarged view of part A in FIG.

[0038] Fig.14 is a cross-sectional view of the partition ribs and the airflow runway of the present invention (the fifth structure);

[0039] Fig.15 yes Fig.14 Schematic diagram of the structure of the gas-producing parts;

[0040] Fig.16 is a cross-sectional view of the partition ribs and the airflow runway of the present invention (the sixth structure);

[0041] Fig.17 yes Fig.16 Schematic diagram of the structure of the gas-producing parts;

[0042] Fig.18 yes Fig.17 A partial enlarged view of the middle B part;

[0043] Fig.19 is a cross-sectional view of the partition ribs and the airflow runway of the present invention (the seventh structure);

[0044] Fig. 20 yes Fig.19 Schematic diagram of the structure of the gas-producing parts;

[0045] Fig.21 is a cross-sectional view of the partition ribs and the airflow runway of the present invention (eighth structure);

[0046] Fig. 22 yes Fig.21 Schematic diagram of the structure of the gas-producing parts;

[0047] Fig.23 is a cross-sectional view of the partition ribs and the airflow runway of the present invention (ninth structure);

[0048] Fig.24 yes Fig.23 Schematic diagram of the structure of the gas-producing parts;

[0049] Fig.25 is a cross-sectional view of the partition ribs and the airflow runway of the present invention (the tenth structure);

[0050] Fig.26 yes Fig.25 The schematic diagram of the structure of the gas-producing component in FIG.

[0051] Fig. 27 is a cross-sectional view of the partition ribs and the airflow runway of the present invention (the eleventh structure);

[0052] Fig.28 yes Fig. 27 Schematic diagram of the structure of the gas-producing parts;

[0053] Fig.29 is a cross-sectional view of the partition ribs and the airflow runway of the present invention (the twelfth structure);

[0054] Fig.30 yes Fig.29 Schematic diagram of the structure of the gas-producing parts;

[0055] Fig.31 It is an arrangement method of multiple arc-extinguishing grids in the present invention;

[0056] Reference numerals:

[0057] 1-gas producing part, 11-first positioning part, 12-second positioning part, 13-partition rib, 130-partition layer, 131-edge end face, 14-installing groove, 2-arc isolating part, 21-closing part, 22-first limiting part, 23-second limiting part, 3-arc extinguishing grid, 31-leg, 32-arc extinguishing notch, 33-arc extinguishing groove, 4-moving arc striking part, a-airflow runway. DETAILED DESCRIPTION

[0058] The specific implementation of the arc extinguishing chamber of the present invention is further described below in conjunction with the embodiments given in the accompanying drawings. The arc extinguishing chamber of the present invention is not limited to the description of the following embodiments.

[0059] The arc extinguishing chamber includes an arc extinguishing cavity, and an opening is provided on one side of the arc extinguishing cavity, which can be used as an arc entry port. When the contact mechanism of the circuit breaker is arranged near the opening, the arc generated by the disconnection of the contact mechanism can be introduced from the opening. At the same time, the opening can also avoid the moving contact of the contact mechanism. Of course, the arc extinguishing cavity can also be provided with an arc entry port that cooperates with the contact mechanism. A grid group is arranged in each arc extinguishing cavity, and the grid group includes a plurality of arc extinguishing grids 3 arranged at intervals, and an arc extinguishing gap is formed between two adjacent arc extinguishing grids 3. An arc extinguishing notch 32 is formed between the two legs 31 of each arc extinguishing grid 3. The arc extinguishing notches 32 of the plurality of arc extinguishing grids 3 of the same grid group are connected to each other to form an arc extinguishing groove 33. The arc extinguishing groove 33 is opposite to the opening of the arc extinguishing cavity. When the arc enters the arc extinguishing cavity, the arc is cut by the plurality of arc extinguishing grids 3 of the grid group.

[0060] The improvement of the present application is that a gas-producing part 1 and an arc-isolating part 2 are also provided in the arc-extinguishing chamber, and a plurality of mounting grooves 14 are provided on the side of the gas-producing part 1 facing the grid group, and a plurality of mounting grooves 14 are provided on the side of the gas-producing part 1 facing the grid group, and the mounting grooves 14 are used to cooperate with the outer edge of the arc-extinguishing grid 3, and the arc-isolating part 2 is provided along the inner side of the arc-extinguishing groove 33 and is buckled with the adjacent gas-producing part 1 to cooperate with the limited arc-extinguishing grid 3. In this way, the mounting groove 14 of the gas-producing part 1 is used to cooperate with the outer edge of the arc-extinguishing grid 3, and the arc-isolating part 2 is buckled with the gas-producing part 1 to jointly limit the arc-extinguishing grid 3. The gas-producing part 1 can replace the side plate of the existing arc-extinguishing chamber, which can reduce the number of components, simplify the assembly process, and ensure the stable cooperation between the gas-producing part 1 and the arc-extinguishing grid 3. In other embodiments, after the arc-isolating member 2 is buckled with the adjacent gas-generating member 1 , the gas-generating member 1 , the arc-isolating member 2 and all the arc-extinguishing grids 3 can be connected into an arc-extinguishing chamber of an integrated structure, thereby being more convenient to install in the circuit breaker base.

[0061] Specifically, a mutually cooperating snap-fitting structure is arranged between the arc-isolating member 2 and the adjacent gas-producing member 1, wherein the snap-fitting structure includes at least one pair of mutually cooperating positioning portions and limiting portions, the positioning portion can be arranged on the arc-isolating member 2 and / or the gas-producing member 1, and correspondingly, the limiting portion is also arranged on the gas-producing member 1 and / or the arc-isolating member 2, wherein the positioning portion and the limiting portion can be mutually cooperating slots and platforms, slots and hooks, or the positioning portion and the limiting portion can be mutually cooperating grooves and protrusions, etc. Furthermore, the positioning portion is arranged at a position close to the edge of the arc-isolating member 2, and the limiting portion is arranged on the side of the gas-producing member 1 facing away from the arc-extinguishing grid 3, which can not only realize the snap-fitting of the arc-isolating member 2 and the gas-producing member 1, but also avoid the positioning structure occupying space in the arc-extinguishing chamber.

[0062] Furthermore, the edge of the arc-isolating member 2 extends along the end of the leg 31 toward the direction close to the adjacent gas-producing member 1 to form a closed portion 21, so that the arc-isolating member 2 cooperates with the adjacent gas-producing member 1 to produce a gas-producing cavity, and the leg 31 on the same side of the grid group is limited and wrapped in the gas-producing cavity, and a plurality of spaced-apart ribs 13 are arranged on the side of the gas-producing member 1 facing the arc-isolating member 2, each of the ribs 13 is located between two adjacent arc-extinguishing grids 3, and the edge connected between the two ends of the ribs 13 is spaced opposite to the arc-isolating member 2 and forms an airflow runway a corresponding to the leg 31, and the airflow runway a corresponds to the inner side of the leg 31, that is, the airflow runway a corresponds to the side of the leg 31 close to the arc-extinguishing groove 33 (arc-extinguishing notch 32), and the structure of the gas-producing cavity and the airflow runway a allows the arc to be pushed into the airflow runway a for cooling and cutting, which is beneficial to extinguishing the arc at the leg 31.

[0063] Combination Figure 1-31 A specific embodiment of an arc extinguishing chamber is provided.

[0064] The arc extinguishing chamber includes an arc extinguishing cavity, which includes a pair of gas producing parts 1 and a pair of arc isolating parts 2. The pair of gas producing parts 1 are spaced apart from each other and serve as two side walls of the arc extinguishing cavity respectively. One side of the pair of gas producing parts 1 is bent toward each other and butt-jointed to form a closed end, and the other end opposite to the closed end is opened as an opening of the arc extinguishing cavity. A plurality of slots are provided on the pair of gas producing parts 1, and the slots are distributed on the side walls of the arc extinguishing cavity on both sides of the opening (the inner wall of the gas producing parts 1). A grid group is arranged in the arc extinguishing cavity, and the grid group includes a plurality of arc extinguishing grids 3. The edge of each arc extinguishing grid 3 is provided with a protrusion that cooperates with the slot.

[0065] An arc-extinguishing gap is formed between two adjacent arc-extinguishing grids 3, one end of each arc-extinguishing gap is connected to the opening, the central axis of each arc-extinguishing gap can be parallel to the central axis of the opening, or can be arranged at an angle to each other, preferably, the angle between the central axis of each arc-extinguishing gap and the central axis of the opening is in the range of 0 to 45°; a plurality of through holes arranged at intervals are provided at the closed end, each through hole is connected to a partial area of ​​an arc-extinguishing gap, preferably, two adjacent through holes are arranged in a staggered manner, for example, a plurality of through holes are arranged to swing up and down about the center line of the closed end, and the shape and size of the through holes are not specifically limited, so as to facilitate lengthening the arc. In addition, in the present embodiment, the through holes are used to discharge the exhaust gas in the arc-extinguishing cavity, that is, along Figure 5 , 7 , 9, 11, 14, 16, 19, 21, 23, 25, 27 and 29 are discharged in the downward direction of the arrows.

[0066] The two legs 31 of each arc-extinguishing grid 3 are respectively located on both sides of the opening of the arc-extinguishing cavity, and the two adjacent arc-extinguishing gaps 32 are connected to form an arc-extinguishing groove 33 corresponding to the opening. A pair of arc-isolating parts 2 are respectively arranged along the inner side of the arc-extinguishing groove 33. Preferably, each arc-isolating part 2 is buckled with an adjacent gas-producing part 1 to limit the grid group arranged in the arc-extinguishing cavity.

[0067] Specifically, a mutually cooperating snap-fitting structure is arranged between the arc-isolating member 2 and the adjacent gas-producing member 1, wherein the snap-fitting structure includes at least one pair of mutually cooperating positioning portions and limiting portions, the positioning portion can be arranged on the arc-isolating member 2 and / or the gas-producing member 1, and correspondingly, the limiting portion is also arranged on the gas-producing member 1 and / or the arc-isolating member 2, wherein the positioning portion and the limiting portion can be mutually cooperating slots and platforms, slots and hooks, or the positioning portion and the limiting portion can be mutually cooperating grooves and protrusions, etc. Furthermore, the positioning portion is arranged at a position close to the edge of the arc-isolating member 2, and the limiting portion is arranged on the side of the gas-producing member 1 facing away from the arc-extinguishing grid 3, which can not only realize the snap-fitting of the arc-isolating member 2 and the gas-producing member 1, but also avoid the positioning structure occupying space in the arc-extinguishing chamber.

[0068] In this embodiment, the edge of the arc-isolating member 2 is bent and extended to form a closed portion 21. When the arc-isolating member 2 is assembled on one side of the arc-extinguishing groove 33, the closed portion 21 cooperates with the gas-producing member 1 along the end of the leg 31, so that the arc-isolating member 2 cooperates with the adjacent gas-producing member 1 to form a gas-producing cavity that can limit and wrap the leg 31. Further, as Figure 3 As shown, a clamping platform as a first limiting portion 22 is provided at the middle edge of the closed portion 21, and a clamping hook as a second limiting portion 23 is provided at the two end edges of the closed portion 21. Figure 3 In the figure, the platform is located between two hooks, and the extension length of the hook is greater than the extension length of the platform. Each gas producing part 1 is provided with a first positioning portion 11 and a second positioning portion 12 respectively cooperating with the first limiting portion 22 and the second limiting portion 23 on the side facing away from the arc extinguishing grid 3.

[0069] Specific as Figure 4 As shown, the second limiting portion 23 includes an extension portion, wherein the extension portion extends along a side parallel to the gas generating member 1 and facing away from the arc extinguishing grid 3. Figure 4 The middle extension portion is in the shape of a straight rod, and is bent from the end of the extension portion (the end away from the closing portion 21) toward the direction close to the gas-producing part 1 to form a hook portion. At this time, the hook portion and the extension portion form a hook. Preferably, the side of the hook portion facing away from the closing portion 21 is a matching bevel, and the matching bevel gradually reduces the thickness of the hook portion.

[0070] Each gas-producing component 1 cooperates with an adjacent arc-isolating component 2 to form a gas-producing cavity. The gas-producing cavity is arranged along one side of the arc-extinguishing cavity for limiting the grid group and wrapping the legs 31 on the same side. A plurality of spaced-apart partition ribs 13 are arranged in the gas-producing cavity. The partition ribs 13 separate the legs 31 of two adjacent grids. The gap between two adjacent partition ribs 13 can be considered as a mounting groove 14 for accommodating the arc-extinguishing grid 3. At least part of the edge of each partition rib 13 is spaced relative to the inner wall of the gas-producing cavity to form an airflow runway a corresponding to the side position of the leg 31. In the present embodiment, the airflow runway a is located between the arc-isolating component 2 and the partition rib 13. At this time, the airflow runway a corresponds to the position on the inner side of the leg 31, that is, the airflow runway a corresponds to the position of the leg 31 close to the arc-extinguishing groove 33 (arc-extinguishing notch 32).

[0071] like Figure 1 , 2 As shown in Figure 4, the gas producing part 1 is a rectangular plate-like structure with a certain thickness as a whole. A plurality of spaced-apart partition ribs 13 are protruding from one side of the gas producing part 1. The gap between two adjacent spaced-apart partition ribs 13 can be used as a mounting groove 14 to accommodate the arc extinguishing grid 3. In the present embodiment, one side edge of each gas producing part 1 extends outward to form a convex edge. When a pair of gas producing parts 1 are spaced-apart to form an arc extinguishing cavity, the two convex edges are butted to form a closed end of the arc extinguishing cavity. Preferably, a plurality of through holes are provided at the closed end of the arc extinguishing cavity. The central axis of the through hole is parallel to the central axis of the mounting groove 14 and is used to communicate with a partial area of ​​an arc extinguishing gap. Two adjacent through holes are staggered, wherein at least one slot is provided in each mounting groove 14 located on the side wall of the arc extinguishing cavity, and each slot is used to limit the insertion of the protrusion of the arc extinguishing grid 3; Three slots are provided on the side of the gas component 1 facing away from the arc extinguishing grid 3, one of which serves as a first positioning portion 11 to be clamped with the clamping table, and the first positioning portion 11 is located in the middle of the gas producing component 1 near the edge, and the other two slots serve as second positioning portions 12 to be clamped with two second limiting portions 23 respectively. In the present embodiment, the matching inclined surface of the second limiting portion 23 is conducive to plugging with the slot. At the same time, when the second limiting portion 23 is matched with the second positioning portion 12, the matching inclined surface is located on the side away from the closed portion 21, which is also conducive to preventing the second limiting portion 23 from separating from the second positioning portion 12, thereby improving the degree of matching. Preferably, when the first positioning portion 11 is matched with the first limiting portion 22, and the second positioning portion 12 is matched with the second limiting portion 23, the surface of the side of the gas producing component 1 facing away from the arc isolating component 2 is kept approximately flat to prevent occupying too much space.

[0072] When the arc extinguishing grid 3 is arranged in the arc extinguishing cavity, the leg 31 of each arc extinguishing grid 3 is located in the gas generating cavity, and the end of the leg 31 is limited by the closed portion 21 of the arc isolation member 2. At the same time, the end of each arc extinguishing grid 3 away from the leg 31 is limited by the closed end of the arc extinguishing cavity.

[0073] The distance between the edge connected between the two ends of the partition rib 13 and the inner wall of the gas generating cavity is not completely equal, that is, the protruding height of each partition rib 13 is not completely equal, so that the distance between the edge connected between the two ends of the partition rib 13 and the arc isolation member 2 is not completely equal, that is, the edge end face 131 connected between the two ends of the partition rib 13 is not completely a plane parallel to the arc isolation member 2, the partition rib 13 is cut along a direction parallel to the arc extinguishing grid 3, and the edge cross-sectional line connected between the two ends of the partition rib 13 is one or more combinations of oblique lines, arcs or broken lines, or the edge cross-sectional line of the partition rib is a combination of straight lines and arcs and / or oblique lines, which is conducive to forming a structure in which the inner diameters of each section of the airflow runway a are not completely the same. By changing the inner diameter of the airflow runway a, the flow rate of the gas in the airflow runway a is changed, which is conducive to arc extinguishing.

[0074] like Figure 4-24 As shown, each partition rib 13 is a plate-like structure as a whole, and the two ends of the partition rib 13 have different protruding heights, wherein the higher end is closer to the closed portion 21 of the arc isolation member 2, and the lower end is adjacent to the closed end of the arc extinguishing chamber, and the edge connected between the two ends of the partition rib 13 is spaced relative to the arc isolation member 2 to form an airflow runway a, wherein the inner diameter of the airflow runway a is smaller in an area closer to the closed portion 21.

[0075] Combination Figure 5 , 6 A first structure of the partition ribs 13 and the airflow runway a in this embodiment is provided.

[0076] like Figure 6 As shown, the edge between the two ends of the rib 13 is a diagonal line area, that is, Figure 5 In the figure, the edge end face 131 connected between the two ends of the partition rib 13 is an inclined plane inclined opposite to the arc isolation member 2, and the edge section line connected between the two ends of the partition rib 13 is an oblique line. The oblique line area and the arc isolation member 2 are spaced apart to form an airflow runway a. In the figure, the airflow runway a is triangular in cross section corresponding to the inner area of ​​the support leg 31.

[0077] Combination Figure 7 , 8 A second structure of the partition ribs 13 and the airflow runway a in this embodiment is provided.

[0078] like Figure 7 , 8As shown, the edge connected between the two ends of the partition rib 13 includes an arc area and a straight area, that is, the edge end face 131 connected between the two ends of the partition rib 13 includes a convex surface protruding toward the arc isolation piece 2 and a plane parallel to the arc isolation piece 2, and the edge cross-sectional line connected between the two ends of the partition rib 13 is an arc and a straight line connected in sequence, wherein the arc area corresponds to the open sides of the arc extinguishing cavity and is respectively spaced opposite to the arc isolation piece 2, the arc area is an arc convex outward, and the closer the arc area is to the closed portion 21, the smaller the distance between the arc area and the arc isolation piece 2 is, and the straight area is connected to the arc area and is located near the closed end of the arc extinguishing cavity.

[0079] In this structure, the airflow runway a formed by the separation ribs 13 and the arc-isolating member 2 is mainly located between the arc-shaped area and the arc-isolating member 2, and the closer the airflow runway a is to the end of the leg 31, the smaller the inner diameter is.

[0080] Combination Fig. 9 , 10 A third structure of the partition ribs 13 and the airflow runway a of this embodiment is provided.

[0081] like Fig.10 As shown, the edge connected between the two ends of the partition rib 13 includes a slanted area and a straight area, that is, the edge end face 131 connected between the two ends of the partition rib 13 includes a slanted surface and a plane parallel to the arc isolation piece 2, and the edge cross-sectional line connected between the two ends of the partition rib 13 is a slanted line and a straight line connected in sequence, wherein the slanted area corresponds to the open sides of the arc extinguishing chamber and is spaced opposite to the arc isolation piece 2 respectively, and the closer the slanted area is to the closed portion 21, the smaller the distance between the slanted area and the arc isolation piece 2 is, and the straight area is connected to the slanted area and is located near the closed end of the arc extinguishing chamber.

[0082] In this structure, the airflow runway a formed by the separation ribs 13 and the arc-isolating member 2 is mainly located between the oblique line area and the arc-isolating member 2, and the closer the airflow runway a is to the end of the leg 31, the smaller the inner diameter is.

[0083] Combination Figure 11-13 A fourth structure of the partition ribs 13 and the airflow runway a in this embodiment is provided.

[0084] like Fig.12 , 13 As shown, the edge connected between the two ends of each barrier rib 13 includes at least two barrier layers 130, and the two adjacent barrier layers 130 are stacked in a direction parallel to the plane where the arc-extinguishing grid 3 is located. The edge cross-sectional line of each barrier layer 130 is an oblique line, an arc line or a fold line. Preferably, the edge cross-sectional lines of the two adjacent barrier layers 130 are different, and the edge cross-sectional line of at least one barrier layer 130 is a step-shaped fold line. Fig.13In the embodiment, each barrier rib 13 includes two stacked barrier layers 130, and the protruding heights of the two barrier layers 130 are different, wherein the barrier layer 130 with a larger protruding height is a first barrier layer, and the edge cross-sectional line of the first barrier layer is an oblique line, so that the edge end surface 131 of the barrier layer 130 facing the arc isolation member 2 is an inclined inclined surface, and the other barrier layer 130 with a smaller protruding height is a second barrier layer, and the edge cross-sectional line of the second barrier layer is a step-shaped broken line, so that the edge end surface 131 of the barrier layer 130 facing the arc isolation member 2 is a step surface, wherein the airflow runway a formed between the first barrier layer and the arc isolation member 2 refers to the first structure in this embodiment, and the airflow runway a formed between the second barrier layer and the arc isolation member 2 is formed by the step-shaped edge and the arc isolation member 2 being spaced relative to form the airflow runway a, Fig.11 , 13 In the embodiment, the inner diameter of the airflow runway a is gradually reduced in a step-shaped manner, wherein the portion with the smallest inner diameter is closer to the end of the support leg 31.

[0085] Of course, the edge cross-sectional lines of each partition 130 are not limited to oblique lines or fold lines, but may also be concave or convex arcs. The cooperation to form the airflow runway a can refer to other structures of this embodiment. In addition, the edge cross-sectional lines of two adjacent partitions 130 may also be the same, and it is only necessary to make the protruding heights of the two adjacent partitions 130 different.

[0086] Combination Fig.14 , 15 A fifth structure of the partition ribs 13 and the airflow runway a in this embodiment is provided.

[0087] The edge connected between the two ends of the partition 13 includes an arc-shaped area and a straight area, wherein the arc-shaped area corresponds to the open sides of the arc-extinguishing cavity and is respectively spaced opposite to the arc-isolating member 2, the arc-shaped area is an arc-shaped area concave inward, and the distance between the arc-shaped area and the arc-isolating member 2 gradually decreases as it approaches the closed portion 21, and the straight area is connected to the arc-shaped area and is located near the closed end of the arc-extinguishing cavity.

[0088] In this structure, the airflow runway a formed by the separation ribs 13 and the arc-isolating member 2 is mainly located between the arc-shaped area and the arc-isolating member 2, and the closer the airflow runway a is to the end of the leg 31, the smaller the inner diameter is.

[0089] Combination Figure 16-18 A sixth structure of the partition ribs 13 and the airflow runway a in this embodiment is provided.

[0090] Similar to the fourth structure in this embodiment, the edge connected between the two ends of each partition 13 includes two partitions 130 with different protrusion heights, one of which adopts the structure of the second partition in the fourth structure, and the other partition 130 has a larger protrusion height, and its edge cross-sectional line is arc-shaped, and the edge end face 131 of the partition 130 facing the arc isolation member 2 is a concave surface recessed inwardly. The partition 130 cooperates with the arc isolation member 2 to form an airflow runway a, which can be seen in the fifth structure of this embodiment.

[0091] Combination Fig.19 , 20 A seventh structure of the partition ribs 13 and the airflow runway a in this embodiment is provided.

[0092] like Fig.19 , 20 As shown, the edge connected between the two ends of the partition rib 13 is an arc convex outward, that is, the cross-sectional line of the edge connected between the two ends of the partition rib 13 is an arc convex outward, and the airflow runway a is formed by the arc edge of the partition rib 13 and the arc isolation member 2. The closer the edge of the partition rib 13 is to the opening of the arc extinguishing chamber, the smaller the distance between the edge of the partition rib 13 and the arc isolation member 2 is, that is, the edge of the partition rib 13 near the opening of the arc extinguishing chamber can be partially in contact with the arc isolation member 2, so that the inner diameter of the airflow runway a becomes smaller as it is closer to the end of the support leg 31.

[0093] Combination Fig.21 , 22 An eighth structure of the partition ribs 13 and the airflow runway a in this embodiment is provided.

[0094] like Fig.21 , 22 As shown, the edge connected between the two ends of the partition rib 13 is an inwardly concave arc, that is, the edge end face 131 connected between the two ends of the partition rib 13 is an arc-shaped concave surface, and the edge cross-sectional line connected between the two ends of the partition rib 13 is an inwardly concave arc. The arc-shaped edge of the partition rib 13 and the arc-isolating member 2 are spaced apart to form an airflow runway a, and the edge of the partition rib 13 becomes closer to the opening of the arc-extinguishing chamber and the spacing between the arc-isolating member 2 becomes smaller, so that the inner diameter of the airflow runway a gradually decreases as it approaches the end of the support leg 31.

[0095] Combination Fig.23 , 24 A ninth structure of the partition ribs 13 and the airflow runway a in this embodiment is provided.

[0096] like Fig.23 , 24As shown, the edge connected between the two ends of the partition rib 13 is in a step shape, that is, the edge end face 131 connected between the two ends of the partition rib 13 is a step surface, and the edge cross-sectional line connected between the two ends of the partition rib 13 is a step-shaped broken line. The step-shaped edge of the partition rib 13 is spaced relative to the arc isolation member 2 to form an airflow runway a, and the inner diameter of the airflow runway a gradually decreases near the end of the support leg 31.

[0097] In addition, the protruding height of the middle part of each partition rib 13 is greater than the protruding height of the two ends, so that the airflow runway a has a structure in which the inner diameter of the middle area is smaller than the inner diameter of the two ends. Preferably, the airflow runway a adopts a gradual transition so that the airflow runway a as a whole presents a Laval nozzle structure, which is beneficial to increase the flow rate of the airflow. Correspondingly, the edge end face 131 connected between the two ends of the partition rib 13 is approximately a convex arc surface. Therefore, the edge cross-sectional line connected between the two ends of the partition rib 13 is an arc line, or a combination of a straight line and an arc line or an oblique line.

[0098] Combination Fig.25 , 26 A tenth structure of the partition ribs 13 and the airflow runway a in this embodiment is provided.

[0099] like Fig.25 , 26 As shown, the edge connected between the two ends of the partition rib 13 is an arc-shaped area, that is, the edge end face 131 connected between the two ends of the partition rib 13 is a protruding convex surface, the edge cross-sectional line connected between the two ends of the partition rib 13 is an arc line, and the arc-shaped area is a convex surface protruding in the middle. The arc-shaped area and the arc-isolating member 2 are spaced apart to form an airflow runway a. The inner diameter of the airflow runway a is the smallest in the middle area and the largest in the two end areas, thereby forming a Laval nozzle-shaped airflow runway a.

[0100] Combination Fig. 27 , 28 An eleventh structure of the partition ribs 13 and the airflow runway a in this embodiment is provided.

[0101] like Fig. 27 , 28 As shown, the edge connected between the two ends of the partition rib 13 includes two arc-shaped areas and a straight area, that is, the edge end face 131 connected between the two ends of the partition rib 13 is a plane parallel to the arc isolation piece 2 connected between two convex surfaces protruding outward, and the edge cross-sectional line connected between the two ends of the partition rib 13 is two arc lines and a straight line, wherein the straight area is connected between the two arc areas, and the protruding height of the partition rib 13 area corresponding to the straight area is the largest, and each arc area is an outward convex surface structure, and the edge of the partition rib 13 is spaced relatively from the arc isolation piece 2 to form an airflow runway a, and the distance from the straight area to the arc isolation piece 2 is the smallest, so that the inner diameter of the airflow runway a is the smallest in the middle area and larger in the two end areas, thereby forming a Laval nozzle-shaped airflow runway a.

[0102] Combination Fig.29 , 30 A twelfth structure of the partition ribs 13 and the airflow runway a in this embodiment is provided.

[0103] like Fig.29 , 30 As shown, the edge connected between the two ends of the partition rib 13 includes two oblique areas and one straight area, that is, the edge end face 131 connected between the two ends of the partition rib 13 is a plane parallel to the arc isolation piece 2 connected between two oblique surfaces inclined toward the two ends respectively, and the edge cross-sectional line connected between the two ends of the partition rib 13 is two oblique lines and one straight line, wherein the straight area is connected between the two oblique areas, and the area of ​​the partition rib 13 corresponding to the straight area has the largest protruding height, and the end of one oblique area away from the straight area has the smallest protruding height, the edge of the partition rib 13 and the arc isolation piece 2 are spaced relatively to form an airflow runway a, and the distance from the straight area to the arc isolation piece 2 is the smallest, so that the inner diameter of the airflow runway a is the smallest in the middle area and the largest in the two end areas, thereby forming a Laval nozzle-shaped airflow runway a.

[0104] Further, in this embodiment, the plurality of arc extinguishing grids 3 in the grid group arranged in the arc extinguishing cavity can be arranged at intervals along one direction, and of course, can also be arranged along two directions, for details, see Fig.31 .

[0105] The plurality of arc-extinguishing grids 3 in the grid group are divided into first arc-extinguishing grids 3 and second arc-extinguishing grids 3, wherein the plurality of first arc-extinguishing grids 3 are arranged in an arc-extinguishing cavity opposite to the opening, the plurality of first arc-extinguishing grids 3 are arranged in parallel and at intervals, the plurality of second arc-extinguishing grids 3 are arranged in the arc-extinguishing cavity on one side of the opening, and the plurality of second arc-extinguishing grids 3 are arranged at intervals between the first arc-extinguishing grids 3 and the opening along a direction parallel to the central axis of the opening, the adjacent first arc-extinguishing grids 3 and the second arc-extinguishing grids 3 are spaced opposite to each other, so that the entire grid group forms an L-shaped structure in the arc-extinguishing cavity, preferably, the first arc-extinguishing grids 3 and the second arc-extinguishing grids 3 are arranged obliquely in the arc-extinguishing cavity, at which time an angle is formed between the arc-extinguishing gap between two adjacent arc-extinguishing grids 3 and the central axis of the opening, and the angle ranges from 0 to 45°.

[0106] In addition, a moving arc-striking member 4 may be further provided in the arc-extinguishing chamber, one end of the moving arc-striking member 4 being parallel to and opposite to the arc-extinguishing grid 3 of the grid group, and the other end of the moving arc-striking member 4 serving as an arc-striking portion. Preferably, the arc-striking portion is formed by bending and extending one end of the moving arc-striking member 4, and the arc-striking portion extends outside the arc-extinguishing chamber for cooperation with the moving contact of the contact mechanism.

[0107] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate directions or positional relationships based on directions or positional relationships shown in the accompanying drawings, or directions or positional relationships that are usually placed when in use, and are only for the convenience of description, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish descriptions, and cannot be understood as indicating relative importance.

[0108] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. An arc extinguishing chamber, comprising an arc extinguishing cavity and at least one grid group, wherein the grid group comprises a plurality of arc extinguishing grids (3) arranged at intervals in the arc extinguishing cavity, an arc extinguishing gap is formed between two adjacent arc extinguishing grids (3), an arc extinguishing gap (32) is formed between two legs (31) of each arc extinguishing grid (3), and the arc extinguishing gaps (32) of the plurality of arc extinguishing grids (3) are correspondingly connected to form an arc extinguishing groove (33), characterized in that: The arc extinguishing chamber comprises a gas producing part (1) and an arc isolating part (2); a plurality of mounting grooves (14) are arranged on a side of the gas producing part (1) facing the grid group; the mounting grooves (14) are used to cooperate with the outer edge of the arc extinguishing grid (3) in a limiting manner; the arc isolating part (2) is arranged along the inner side of the arc extinguishing groove (33) and is buckled with the adjacent gas producing part (1) to cooperate with the limiting arc extinguishing grid (3).

2. The arc extinguishing chamber according to claim 1, characterized in that: A mutually cooperating buckling structure is provided between the arc-isolating member (2) and the adjacent gas-generating member (1), the buckling structure comprising at least one pair of mutually cooperating positioning portions and limiting portions, the positioning portion being provided at a position close to an edge of the arc-isolating member (2), and the limiting portion being provided at a side of the gas-generating member (1) facing away from the arc-extinguishing grid (3).

3. The arc extinguishing chamber according to claim 1 or 2, characterized in that: The edge of the arc-isolating member (2) extends along the end of the supporting leg (31) in a direction close to the adjacent gas-producing member (1) to form a closed portion (21), so that the arc-isolating member (2) cooperates with the adjacent gas-producing member (1) to form a gas-producing cavity for limiting and wrapping the supporting leg (31).

4. The arc extinguishing chamber according to claim 3, characterized in that: A clamping platform as a first limiting portion (22) is provided at the middle edge of the closed portion (21), and a clamping hook as a second limiting portion (23) is provided at the two end edges of the closed portion (21). Three clamping grooves are provided on the side of the gas producing part (1) facing away from the arc extinguishing grid (3), one of the clamping grooves is used as the first positioning portion (11) to be clamped with the clamping platform, and the other two clamping grooves are used as the second positioning portions (12) to be clamped with the two second limiting portions (23) respectively.

5. The arc extinguishing chamber according to claim 3, characterized in that: A plurality of spaced-apart partition ribs (13) are provided on one side of the gas generating member (1) facing the arc-isolating member (2), each of the spaced-apart partition ribs (13) being located between two adjacent arc-extinguishing grids (3), and the edge connected between the two ends of the spaced-apart partition ribs (13) being spaced-apart from the arc-isolating member (2) and forming an airflow runway (a) corresponding to the supporting leg (31).

6. The arc extinguishing chamber according to claim 5, characterized in that: The protruding heights of each partition rib (13) are not completely equal, and the distances between the edge connected between the two ends of the partition rib (13) and the arc isolation member (2) are not completely equal, so that the inner diameters of each section of the airflow runway (a) are not completely equal.

7. The arc extinguishing chamber according to claim 6, characterized in that: One end of each airflow runway (a) has the largest inner diameter, and the other end of the airflow runway (a) has the smallest inner diameter and corresponds to the area near the end of the support leg (31).

8. The arc extinguishing chamber according to claim 7, characterized in that: The edge cross-sectional line connected between the two ends of each partition rib (13) is one or a combination of an oblique line, an arc line and a fold line, or the edge cross-sectional line is a combination of a straight line and an arc line and / or an oblique line, so that the inner diameter of the airflow runway (a) changes gradually.

9. The arc extinguishing chamber according to claim 8, characterized in that: The edge cross-section line connected between the two ends of each partition rib (13) is a step-shaped broken line.

10. The arc extinguishing chamber according to claim 8, characterized in that: Each barrier rib (13) comprises at least two barrier layers (130), two adjacent barrier layers (130) are stacked in a direction parallel to the plane where the arc extinguishing grid (3) is located, and the edge cross-sectional line of each barrier layer (130) is one or a combination of more than one of an oblique line, an arc line and a fold line, or the edge cross-sectional line is a combination of a straight line and an arc line and / or an oblique line.

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