Arc extinguishing mechanism and circuit breaker

Abstract

The utility model relates to low -voltage electric appliance technical field discloses a kind of arc extinguishing mechanism and circuit breaker. Circuit breaker includes arc extinguishing mechanism, and arc extinguishing mechanism includes arc extinguishing chamber main body and first gas production member, and arc extinguishing chamber main body includes two side plates and multiple arc extinguishing louver plates being installed between two side plates, and multiple arc extinguishing louver plates are arranged along second direction interval, and second direction is perpendicular to first direction;First gas production member is arranged outside arc extinguishing chamber main body, including installation cooperation part and multiple gas production baffle, and multiple gas production baffle is connected with installation cooperation part and is arranged along second direction interval, and each gas production baffle is inserted between adjacent two arc extinguishing louver plates, and installation cooperation part is configured to be connected with the shell of circuit breaker and fixedly connected with cooperation part. The arc extinguishing mechanism of the utility model not only can intercept arc on gas discharge path and quickly produce gas arc extinguishing, and the installation of first gas production member is convenient, fixedly reliable.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical technology, and in particular to an arc-extinguishing mechanism and a circuit breaker. Background Technology

[0002] The arc-extinguishing mechanism is a core component of a circuit breaker. Its function is to quickly and reliably extinguish the electric arc generated when the circuit breaker trips, thereby ensuring the safe disconnection of the circuit. An arc-extinguishing mechanism typically consists of two opposing side plates with multiple spaced arc-extinguishing grids between them. These grids cut off and cool the electric arc. To improve the arc-extinguishing efficiency and speed, some mechanisms incorporate a gas-generating element. After the moving and stationary contacts interrupt the current and generate an arc, the arc erodes the gas-generating element, producing a large amount of gas. This gas increases the arc resistance and electric field strength by cooling and compressing the arc, ultimately leading to an increase in the arc voltage. When the arc voltage exceeds the power frequency recovery voltage across the moving and stationary contacts, the arc is extinguished. However, in related technologies, the gas-generating element is difficult to integrate with rapid contact arc gas generation and is not easy to install and fix.

[0003] Therefore, there is an urgent need for an arc-extinguishing mechanism and circuit breaker to solve the above-mentioned technical problems. Utility Model Content

[0004] One objective of this invention is to provide an arc-extinguishing mechanism that can not only intercept electric arcs in the gas discharge path and quickly generate gas to extinguish the arc, but also makes the first gas-generating component easy to install and reliably fixed.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] Arc extinguishing mechanism, including:

[0007] The main body of the arc-extinguishing chamber includes two side plates that are spaced apart and opposite to each other along a first direction and a plurality of arc-extinguishing grid plates installed between the two side plates. The plurality of arc-extinguishing grid plates are spaced apart along a second direction, which is perpendicular to the first direction.

[0008] The first gas generating component is disposed on the outside of the main body of the arc-extinguishing chamber, including a mounting fitting part and multiple gas generating baffles. The multiple gas generating baffles are connected to the mounting fitting part and are spaced apart along the second direction. Each gas generating baffle is inserted between two adjacent arc-extinguishing grid plates. The mounting fitting part is configured to cooperate with and be fixedly connected to the housing of the circuit breaker.

[0009] As an optional embodiment, the mounting mating part is provided with a mounting groove at at least one end along the first direction, the mounting groove extending through the mounting mating part along a third direction, the third direction being perpendicular to both the first and second directions, the mounting groove being configured to engage with a positioning structure on the housing to lock relative to the housing in the second direction; and / or

[0010] The mounting mating part is provided with a plug-in area at at least one end along the first direction or at least one end along the second direction, the plug-in area being able to be inserted into a slot on the housing along the first direction and locked relative to the housing in the third direction; and / or

[0011] The mounting mating parts abut against the housing at both ends along the first direction to lock relative to the housing in the first direction.

[0012] As an alternative, the mounting groove is constructed as a dovetail groove.

[0013] As an alternative, in a third direction and from the inside to the outside of the arc-extinguishing chamber body, at least a portion of the gas-generating baffle gradually increases in width along the first direction; and / or

[0014] The gas-generating baffle is centrally located relative to the main body of the arc-extinguishing chamber in the first direction.

[0015] As an optional solution, the arc-extinguishing mechanism further includes an arc-blocking cardboard, which is connected to the mounting mating part and is used to block the air outlet on the housing.

[0016] As an alternative, part of the arc-resistant cardboard is sandwiched between the mounting mating part and the housing, and the arc-resistant cardboard has notches at both ends along the first direction, the notches being configured to allow the positioning structure on the housing to pass through.

[0017] As an optional solution, the arc-extinguishing mechanism further includes a second gas-generating component, which is disposed within the main body of the arc-extinguishing chamber and attached to the inner side of the two side plates.

[0018] As an optional solution, the second gas generating component has a mounting hole on its end face facing the arc-extinguishing grid, and at least one of the arc-extinguishing grids has a mounting protrusion that inserts into the mounting hole; and / or

[0019] At least one of the arc-extinguishing grid plates located at one end in the second direction presses against the second gas-generating element along the second direction.

[0020] Another objective of this invention is to provide a circuit breaker that, by employing the aforementioned arc-extinguishing mechanism, achieves good arc-extinguishing effect and a short processing cycle.

[0021] To achieve this objective, the present invention adopts the following technical solution:

[0022] A circuit breaker includes a housing and an operating mechanism, a moving contact, a stationary contact, and an arc-extinguishing mechanism as described in any one of the claims, all mounted on the housing. At least a portion of the moving contact and at least a portion of the stationary contact are disposed within the arc-extinguishing chamber body. The operating mechanism is used to drive the moving contact to contact or separate from the stationary contact. The mounting fitting part cooperates with and is fixedly connected to the housing.

[0023] As an optional embodiment, the mounting mating part is provided with a mounting groove at at least one end along the first direction, the housing includes a positioning structure, the positioning structure includes a through part and a stop part connected to the through part, the through part passes through the mounting groove along a third direction, and the stop part abuts against the side of the mounting mating part opposite to the housing; and / or

[0024] The mounting mating part has a plug-in area at one end along the second direction, and the housing has a slot, the plug-in area being inserted into the slot along the first direction; and / or

[0025] The mounting mating parts abut against the housing at both ends along the first direction.

[0026] The beneficial effects of this utility model are:

[0027] The arc-extinguishing mechanism of this utility model includes an arc-extinguishing chamber body and a first gas-generating component. The arc-extinguishing chamber body includes two opposing side plates and multiple arc-extinguishing grids, which are installed between the two side plates. The arc-extinguishing chamber body forms a space to accommodate the moving contact and the stationary contact. The first gas-generating component is located on the outside of the arc-extinguishing chamber body and includes a mounting fitting part and multiple gas-generating baffles. When assembling the circuit breaker, the multiple gas-generating baffles of the first gas-generating component can be inserted between the arc-extinguishing grids to achieve preliminary fixation between the arc-extinguishing chamber body and the first gas-generating component. Then, the entire arc-extinguishing mechanism is installed onto the housing, and the mounting fitting part is fixedly connected to the housing. This not only facilitates operation but also ensures reliable connection of the first gas-generating component. The arrangement of multiple gas-generating baffles inserted between adjacent arc-extinguishing grids not only intercepts the arc in the arc's discharge path and generates gas to extinguish the arc, reducing arc escape, but the gas-generating baffles also play a certain role in cutting the arc, thereby improving the arc-extinguishing effect.

[0028] The circuit breaker provided by this utility model has a good arc extinguishing effect and a short processing cycle by adopting the above-mentioned arc extinguishing mechanism. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the circuit breaker provided in a specific embodiment of the present utility model;

[0030] Figure 2 This is a cross-sectional view of the circuit breaker provided in a specific embodiment of this utility model;

[0031] Figure 3 This is a schematic diagram of the arc-extinguishing mechanism provided in a specific embodiment of this utility model;

[0032] Figure 4 This is a schematic diagram of the main structure of the arc-extinguishing chamber provided in a specific embodiment of this utility model;

[0033] Figure 5 This is a schematic diagram of the structure of the second gas-generating component provided in a specific embodiment of this utility model;

[0034] Figure 6 This is a schematic diagram of the result of the first gas-generating component provided in a specific embodiment of this utility model;

[0035] Figure 7 This is a cross-sectional view of the circuit breaker provided in a specific embodiment of the present invention at one angle in the mounting slot;

[0036] Figure 8 This is a schematic diagram of the structure of the circuit breaker with a hidden second housing provided in a specific embodiment of the present invention;

[0037] Figure 9 This is a schematic diagram of the structure of the second shell provided in a specific embodiment of this utility model;

[0038] Figure 10 This is a cross-sectional view of the circuit breaker provided in a specific embodiment of the present invention from another angle in the mounting slot.

[0039] In the picture:

[0040] 10. Arc extinguishing mechanism;

[0041] 1. Arc-extinguishing chamber main body; 11. Side plate; 12. Arc-extinguishing grid plate; 12a. First grid plate; 120. Mounting protrusion; 12b. Second grid plate;

[0042] 2. First gas-generating component; 21. Mounting mating part; 211. Mounting groove; 212. Insertion area; 22. Gas-generating baffle; 23. Connecting part;

[0043] 3. Second gas-generating component; 31. Mounting hole; 32. Overlapping plane; 33. Groove;

[0044] 4. Arc-resistant cardboard; 41. Notch;

[0045] 20. Housing; 210. Positioning structure; 210a. Through-hole; 210b. Stop; 220. Slot; 230. First housing; 240. Second housing; 201. Air outlet;

[0046] 30. Operating mechanism;

[0047] 40. Moving contact; 50. Stationary contact. Detailed Implementation

[0048] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not the entire structure.

[0049] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0050] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0051] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0052] This embodiment provides an arc-extinguishing mechanism and a circuit breaker, defining a first direction, a second direction, and a third direction as three mutually perpendicular directions, wherein the first direction is the front-back direction, the second direction is the up-down direction, and the third direction is the left-right direction. Figures 1-3 As shown, the circuit breaker includes a housing 20, an operating mechanism 30, a moving contact 40, a stationary contact 50, and an arc-extinguishing mechanism 10. The operating mechanism 30, stationary contact 50, moving contact 40, and arc-extinguishing mechanism 10 are all mounted on the housing 20, with at least a portion of the moving contact 40 and at least a portion of the stationary contact 50 housed within the arc-extinguishing mechanism 10. The operating mechanism 30 is used to drive the moving contact 40 to contact or separate from the stationary contact 50. An electric arc is generated during the separation of the moving contact 40 and the stationary contact 50; the arc-extinguishing mechanism 10 is used to extinguish the arc, ensuring the safe operation of the circuit breaker.

[0053] like Figure 1 As shown, the housing 20 includes a first housing 230 and a second housing 240, which are disposed opposite to each other and fastened together along a first direction, thereby forming a space to accommodate at least some of the components of the circuit breaker and to support the components. Optionally, the first housing 230 and the second housing 240 can be connected by fasteners such as bolts. It is understood that, without departing from the inventive concept of this application, the specific structure of the operating mechanism 30, the stationary contact 50, and the moving contact 40, and the transmission relationship between the operating mechanism 30 and the moving contact 40 can be any existing type, and are not limited here.

[0054] like Figure 3 and Figure 4As shown, the arc-extinguishing mechanism 10 includes an arc-extinguishing chamber body 1, which includes two side plates 11 and a plurality of arc-extinguishing grid plates 12. The two side plates 11 are spaced apart and opposite each other along a first direction, and the plurality of arc-extinguishing grid plates 12 are disposed between the two side plates 11 and spaced apart along a second direction. Thus, the arc-extinguishing chamber body 1 forms a certain accommodating space, within which at least a portion of the stationary contact 50 and at least a portion of the moving contact 40 are located, i.e., between the two side plates 11. When the moving contact 40 and the stationary contact 50 break and generate an arc, the arc-extinguishing grid plates 12 can elongate the arc and cut it into many short arcs connected in series. When the grid plates are pressed against the short arcs, the arc resistance increases and the voltage rises, thereby achieving the arc-extinguishing effect. In this embodiment, the side plates 11 are made of insulating material, and the arc-extinguishing grid plates 12 are made of metal material. Optionally, the arc-extinguishing grid plates 12 can be connected and fixed to the two side plates 11 by riveting, plugging, or other methods. Optionally, the arc-extinguishing grid plates 12 have an asymmetrical structure in the first direction, with adjacent arc-extinguishing grid plates 12 being staggered and fixed on the side plate 11, thereby improving the arc-extinguishing effect. It should be noted that the staggered arrangement means that adjacent arc-extinguishing grid plates 12 are installed in opposite directions in the first direction. Optionally, both the moving contact 40 and the stationary contact 50 are centrally located relative to the arc-extinguishing chamber body 1 in the first direction, so that the generated arc is evenly distributed when the current is interrupted, which is beneficial for the arc-extinguishing mechanism 10 to extinguish the arc uniformly.

[0055] To improve the arc-extinguishing efficiency of the arc-extinguishing mechanism 10, such as Figure 3 As shown, the arc-extinguishing mechanism 10 also includes a second gas-generating element 3, which is disposed within the arc-extinguishing chamber body 1 and attached to the inner sides of the two side plates 11. In this embodiment, the arc-extinguishing mechanism 10 includes two second gas-generating elements 3, which are respectively attached to the inner sides of the two side plates 11. After the moving contact 40 and the stationary contact 50 interrupt the current and generate an arc, the arc erodes the second gas-generating elements 3 located on both sides of the moving contact 40 and the stationary contact 50, thereby generating a large amount of gas. This gas increases the arc resistance and electric field strength by cooling and compressing the arc, thereby increasing the arc voltage, improving the arc-extinguishing efficiency, reducing the arcing time, and also improving the short-circuit breaking capacity of the circuit breaker. Optionally, the material of the second gas-generating element 3 can be, for example, polytetrafluoroethylene, epoxy glass cloth, etc. Figure 2 As shown, the housing 20 is provided with an air outlet 201, which is arranged opposite to the arc-extinguishing grid plate 12. After the second gas generating element 3 generates a large amount of gas, the gas can pass through the space between the arc-extinguishing grid plates 12, reach the air outlet 201, and finally be discharged from the air outlet 201 to relieve pressure, so as to avoid excessive gas pressure inside the circuit breaker and damage to its internal components.

[0056] like Figure 5As shown, the second gas generating component 3 has a groove 33 on the surface facing the side plate 11. The groove 33 matches the shape of the side plate 11 and the arc extinguishing grid plate 12, so that the side plate 11 and the arc extinguishing grid plate 12 can be tightly fitted.

[0057] like Figure 4 and Figure 5 As shown, a mounting hole 31 is provided on the end face of the second gas generating component 3 facing the arc-extinguishing grid plate 12, and at least one arc-extinguishing grid plate 12 is provided with a mounting protrusion 120, which is inserted into the mounting hole 31. The second gas generating component 3 can be basically fixed by the insertion and cooperation of the mounting protrusion 120 and the mounting hole 31, which is simple in structure and easy to install. In this embodiment, the arc-extinguishing grid plate 12 located at the lowermost end along the second direction is defined as the first grid plate 12a, and the mounting protrusion 120 is provided on the first grid plate 12a.

[0058] like Figure 3 As shown, at least one arc-extinguishing grid plate 12 located at the end of the second direction presses against the second gas-generating component 3 along the second direction. By pressing the second gas-generating component 3 against the second gas-generating component 3 along the second direction, the fixing firmness of the second gas-generating component 3 can be improved, preventing the second gas-generating component 3 from becoming unstable due to the increase in gas pressure inside the arc-extinguishing chamber body 1 after gas generation. In this embodiment, the arc-extinguishing grid plate 12 located at the uppermost end of the second direction is defined as the second grid plate 12b. The top of the second gas-generating component 3 is provided with an overlapping plane 32, and the second grid plate 12b overlaps on the overlapping plane 32, thereby pressing against the second gas-generating component 3 along the second direction.

[0059] When the circuit breaker disconnects the short-circuit current, the electric arc generated between the moving contact 40 and the stationary contact 50 is relatively strong. It is possible that the gas generated by the second gas generating element 3 and the arc extinguishing grid 12 are not able to completely extinguish the arc, resulting in some arc being discharged from the gas outlet 201 to the outside of the circuit breaker.

[0060] In this regard, such as Figure 3 and Figure 6As shown, the arc-extinguishing mechanism 10 also includes a first gas-generating component 2, which is disposed on the outside of the arc-extinguishing chamber body 1. The first gas-generating component 2 includes a mounting fitting part 21 and multiple gas-generating baffles 22. The multiple gas-generating baffles 22 are connected to the mounting fitting part 21 and are spaced apart along the second direction. Each gas-generating baffle 22 is inserted between two adjacent arc-extinguishing grid plates 12. The mounting fitting part 21 is fitted with and fixedly connected to the circuit breaker housing 20. When the moving contact 40 and the stationary contact 50 break and generate an electric arc, on the one hand, the first gas generating element 2 is also eroded by the electric arc, thereby generating a large amount of gas. This gas can further increase the arc voltage by cooling and compressing the electric arc, thereby further improving the overall arc extinguishing efficiency and speed of the arc extinguishing mechanism 10 based on only setting the second gas generating element 3. On the other hand, the arrangement of multiple gas generating baffles 22 being inserted between adjacent arc extinguishing grid plates 12 can not only intercept the electric arc and generate gas to extinguish the arc in the arc discharge path, reducing arc escape, but also enable the gas generating baffles 22 to play a certain role in cutting the electric arc, thereby improving the arc extinguishing effect. On the other hand, the first gas-generating component 2 is located on the outside of the arc-extinguishing chamber body 1. When assembling the circuit breaker, multiple gas-generating baffles 22 of the first gas-generating component 2 can be inserted between the arc-extinguishing grid plates 12 to achieve initial fixation between the arc-extinguishing chamber body 1 and the first gas-generating component 2. Then, the entire arc-extinguishing mechanism 10 is installed onto the housing 20, and the mounting mating part 21 is fixedly connected to the housing 20. This not only makes the assembly operation convenient but also ensures reliable connection of the first gas-generating component 2. Figure 6 As shown, the first gas generating component 2 also includes a connecting portion 23, which extends generally along the second direction and is connected to the mounting mating portion 21. Each arc-extinguishing baffle is connected to the connecting portion 23, thereby indirectly connecting to the mounting mating portion 21. In this embodiment, each gas generating baffle 22 is connected to two adjacent arc-extinguishing grid plates 12 by a clearance fit, thereby improving the assembly convenience of the first gas generating component 2 as a whole with the arc-extinguishing chamber body 1.

[0061] like Figure 3 and Figure 6 As shown, along the third direction and from the inside to the outside of the arc-extinguishing chamber body 1, at least part of the gas-generating baffle 22 gradually increases in width along the first direction. That is, the width of the gas-generating baffle 22 near the inside of the arc-extinguishing chamber body 1 is narrower, which facilitates the gas to enter between the arc-extinguishing grid plates 12 and ensures smooth exhaust. The width of the gas-generating baffle 22 increases from the inside to the outside, which not only increases the contact area between the arc and the gas-generating baffle 22, but also increases the movement path of the arc in the circuit breaker, which is conducive to the complete extinguishing of the arc.

[0062] In this embodiment, the gas-generating baffle 22 is centrally located relative to the arc-extinguishing chamber body 1 in the first direction. Since the moving contact 40 and the stationary contact 50 are centrally located relative to the arc-extinguishing chamber body 1, most of the arc generated by their interruption of current is also centrally located relative to the arc-extinguishing chamber body 1. By setting the gas-generating baffle 22 to be centrally located relative to the arc-extinguishing chamber body 1, it can be ensured that the gas-generating baffle 22 can more easily contact the arc and generate gas, thereby improving the arc-extinguishing effect.

[0063] like Figures 6-9 As shown, the mounting mating part 21 has a mounting groove 211 at at least one end along the first direction, and the mounting groove 211 penetrates the mounting mating part 21 along the third direction. The mounting groove 211 is configured to engage with the positioning structure 210 on the housing 20. When the positioning structure 210 passes through the mounting groove 211 along the third direction, it can be locked relative to the housing 20 at least in the second direction. In this embodiment, as... Figure 7 and Figure 9 As shown, a positioning structure 210 is provided on the inner wall of the housing 20. The positioning structure 210 includes a through portion 210a and a stop portion 210b. The stop portion 210b is connected to the through portion 210a and is arranged sequentially along a third direction. The through portion 210a passes through the mounting groove 211 along the third direction, and the stop portion 210b abuts against the side of the mounting mating portion 21 away from the housing 20. Through the cooperation of the positioning structure 210 and the mounting groove 211, not only can the first gas generating component 2 be installed and fixed relative to the housing 20 in the second direction, but also the first gas generating component 2 can be installed and fixed relative to the housing 20 in the third direction.

[0064] like Figure 6 and Figure 7 As shown, the mounting groove 211 is constructed as a dovetail groove. Correspondingly, the cross-section of the through part 210a of the positioning structure 210 is the same as the cross-section of the mounting groove 211 in shape and size. Therefore, when the mounting groove 211 and the positioning structure 210 are inserted and fitted, the fit between the first gas generating component 2 and the housing 20 is tighter and the fit accuracy is higher.

[0065] In this embodiment, as Figure 6 As shown, the mounting mating part 21 has mounting grooves 211 at both ends along the first direction, and the first shell 230 and the second shell 240 are respectively provided with a mounting structure. When assembling the arc extinguishing mechanism 10, as shown... Figure 7 As shown, the arc-extinguishing mechanism 10 can be inserted into the first housing 230 as a whole along the first direction. During this process, one mounting groove 211 of the mounting mating part 21 is inserted into the positioning structure 210 on the first housing 230. Then, when the second housing 240 is fitted into the first housing 230 along the second direction, the positioning structure 210 on the second housing 240 is inserted into the other mounting groove 211 of the mounting mating part 21. Figure 10As shown, the two ends of the mounting fitting part 21 abut against the housing 20 along the first direction to lock relative to the housing 20 in the first direction. In addition, the limitation of the mounting fitting part 21 along the first direction by the housing 20 also helps to ensure that the gas generating baffle 22 is centered relative to the arc extinguishing chamber body 1 in the first direction.

[0066] like Figures 6-9 As shown, the mounting mating part 21 has a plug-in area 212 at one end along the second direction, and the housing 20 has a slot 220. The plug-in area 212 can be inserted into the slot 220 on the housing 20 along the first direction. The cooperation between the plug-in area 212 and the slot 220 serves two purposes: firstly, it guides the arc-extinguishing mechanism 10 during installation with the first housing 230 and the second housing 240; secondly, it locks the housing 20 and the first gas-generating component 2 in a third direction, ensuring the secure installation of the first gas-generating component 2. In this embodiment, the plug-in area 212 is located at the lower end of the mounting mating part 21, so the slot 220 also provides some support for the first gas-generating component 2. The first housing 230 and the second housing 240 both have slots 220, which are arranged opposite each other along the first direction and are plugged into the two ends of the plug-in area 212 along the first direction, further improving the secure fixing of the first gas-generating component 2. Optionally, the plug-in area 212 can be a thinned area at the end of the mounting mating part 21. In some embodiments (not shown), the mounting mating part 21 may be configured to have a plug-in area 212 at at least one end along the first direction, and the plug-in area 212 can be inserted into the slot 220 on the housing 20 along the first direction, thereby also achieving locking relative to the housing 20 in a third direction.

[0067] like Figure 7 and Figure 8 As shown, the arc-extinguishing mechanism 10 also includes an arc-blocking paperboard 4, which is connected to the mounting fitting part 21 and is used to block the air outlet 201 on the housing 20. By setting the arc-blocking paperboard 4, the arc sprayed towards the air outlet 201 can be reduced, thereby shortening the arc distance. The material of the arc-blocking paperboard 4 is existing technology and will not be described in detail here.

[0068] like Figure 8 As shown, a portion of the arc-resistant cardboard 4 is sandwiched between the mounting fitting part 21 and the housing 20. Notches 41 are provided at both ends of the arc-resistant cardboard 4 along the first direction, and these notches 41 are configured to allow the positioning structure 210 on the housing 20 to pass through. By sandwiching the arc-resistant cardboard 4 between the mounting fitting part 21 and the housing 20, and providing notches 41 on the arc-resistant cardboard 4 for the passing parts 210a of the positioning structure 210 to pass through, the arc-resistant cardboard 4 can be installed and fixed without the need for additional fixing components. The structure is simple and easy to assemble. In this embodiment, notches 41 are provided at both ends of the arc-resistant cardboard 4 along the first direction to mate with the two positioning structures 210 on the housing 20, respectively.

[0069] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. For those skilled in the art, based on the concept of this utility model, there will be changes in the specific implementation methods and application scope. The content of this specification should not be construed as a limitation of this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An arc-extinguishing mechanism, characterized in that, include: The main body (1) of the arc-extinguishing chamber includes two side plates (11) arranged opposite each other at a distance along a first direction and a plurality of arc-extinguishing grid plates (12) installed between the two side plates (11). The plurality of arc-extinguishing grid plates (12) are arranged at a distance along a second direction, which is perpendicular to the first direction. The first gas generating component (2) is disposed on the outside of the main body (1) of the arc-extinguishing chamber, including a mounting fitting part (21) and a plurality of gas generating baffles (22). The plurality of gas generating baffles (22) are connected to the mounting fitting part (21) and are spaced apart along the second direction. Each gas generating baffle (22) is inserted between two adjacent arc-extinguishing grid plates (12). The mounting fitting part (21) is configured to cooperate with and be fixedly connected to the housing (20) of the circuit breaker.

2. The quenching mechanism of claim 1, wherein The mounting mating part (21) is provided with a mounting groove (211) at at least one end along the first direction. The mounting groove (211) extends through the mounting mating part (21) along a third direction, which is perpendicular to both the first and second directions. The mounting groove (211) is configured to engage with a positioning structure (210) on the housing (20) to lock relative to the housing (20) in the second direction; and / or The mounting mating part (21) is provided with a plug-in area (212) at least one end along the first direction or at least one end along the second direction. The plug-in area (212) can be inserted into a slot (220) on the housing (20) along the first direction and locked relative to the housing (20) in the third direction; and / or The mounting mating part (21) abuts against the housing (20) at both ends along the first direction to lock relative to the housing (20) in the first direction.

3. The quenching mechanism of claim 2, wherein The mounting groove (211) is constructed as a dovetail groove.

4. The arc extinguishing mechanism of claim 1, wherein Along a third direction and from the inside to the outside of the arc-extinguishing chamber body (1), at least a portion of the gas-generating baffle (22) gradually increases in width along the first direction; and / or The gas-generating baffle (22) is centrally located relative to the main body (1) of the arc-extinguishing chamber in the first direction.

5. An arc extinguishing mechanism according to any one of claims 1 to 4, characterized in that The arc-extinguishing mechanism also includes an arc-blocking cardboard (4), which is connected to the mounting fitting part (21) and is used to block the air outlet (201) on the housing (20).

6. The quenching mechanism of claim 5, wherein Part of the arc-blocking cardboard (4) is sandwiched between the mounting mating part (21) and the housing (20). The arc-blocking cardboard (4) has notches (41) at both ends along the first direction. The notches (41) are configured to allow the positioning structure (210) on the housing (20) to pass through.

7. An arc extinguishing mechanism according to any one of claims 1-4, characterized in that The arc-extinguishing mechanism also includes a second gas-generating component (3), which is disposed inside the main body (1) of the arc-extinguishing chamber and attached to the inner side of the two side plates (11).

8. The quenching mechanism of claim 7, wherein, The second gas generating component (3) has a mounting hole (31) on its end face facing the arc-extinguishing grid plate (12), and at least one of the arc-extinguishing grid plates (12) has a mounting protrusion (120) that is inserted into the mounting hole (31); and / or At least one of the arc-extinguishing grid plates (12) located at one end of the second direction presses against the second gas-generating element (3) along the second direction.

9. A circuit breaker characterized by The device includes a housing (20) and an operating mechanism (30), a moving contact (40), a stationary contact (50), and an arc-extinguishing mechanism as described in any one of claims 1-8, all mounted on the housing (20). At least a portion of the moving contact (40) and at least a portion of the stationary contact (50) are disposed within the arc-extinguishing chamber body (1). The operating mechanism (30) is used to drive the moving contact (40) to contact or separate from the stationary contact (50). The mounting mating part (21) is mated with and fixedly connected to the housing (20).

10. The circuit breaker of claim 9, wherein, The mounting mating part (21) has a mounting groove (211) at at least one end along the first direction. The housing (20) includes a positioning structure (210), which includes a through part (210a) and a stop part (210b) connected to the through part (210a). The through part (210a) passes through the mounting groove (211) along a third direction. The stop part (210b) abuts against the side of the mounting mating part (21) away from the housing (20). The mounting mating part (21) is provided with a plug-in area (212) at one end along the second direction, and the housing (20) is provided with a slot (220), and the plug-in area (212) is plugged into the slot (220) along the first direction; and / or The mounting mating part (21) abuts against the housing (20) at both ends along the first direction.

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