Arc extinguishing assembly and circuit breaker

Abstract

The utility model discloses an arc extinguishing device and a circuit breaker, and relates to the technical field of circuit breakers. The arc extinguishing assembly comprises a gas blocking cover and an arc extinguishing grid plate group; a semi-closed space is defined by the gas blocking cover, and the semi-closed space is provided with a gas outlet and a static contact alignment opening; the static contact alignment opening is used for giving way, so that the movable contact can be in contact with the static contact; the side, away from the air outlet, of the air blocking cover serves as the first side, and the side where the air outlet is located serves as the second side. The first side of the gas blocking cover is also provided with a gas blocking plate and a moving contact avoiding opening; and an arc extinguishing grid plate group is arranged on the second side of the gas blocking cover and is positioned on a gas outlet path of the gas outlet. According to the utility model, the arc can be driven to be sprayed out from the air outlet in time, so that arc extinguishing can be carried out through the arc extinguishing grid sheet group in time, and burning of the arc to the part of the moving contact outside the air blocking cover and the driving mechanism can be avoided or reduced.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, and more specifically to arc extinguishing components and circuit breakers. Background Technology

[0002] Circuit breakers, as a type of circuit protection device, are mainly used in low-voltage power systems. Circuit breakers typically extinguish electric arcs by incorporating arc-extinguishing components.

[0003] An arc-extinguishing assembly typically includes an open housing and an arc-extinguishing grid assembly. The open housing contains an open space with openings on both sides, forming a first side opening and a second side opening. A moving contact extends into the open space through the first side opening. The movement of the moving contact causes a moving point within the open space to contact or separate from the stationary contact, thereby closing or opening the circuit breaker. The arc-extinguishing grid assembly is located on the side containing the second side opening.

[0004] Gas blowing is a commonly used arc extinguishing method. Specifically, the open-type casing can be made of a gas-generating material. When the circuit breaker switches from closing to opening, an electric arc is generated between the moving and stationary contacts. The arc burns the open-type casing, and the large amount of gas generated creates a positive pressure relative to the second opening in the open space. The positive pressure pushes the arc into the arc-extinguishing grid assembly, thereby accelerating the arc extinguishing process.

[0005] However, how to expel the electric arc from the outlet more promptly to further accelerate the arc extinguishing effect and avoid or reduce the burning of the moving contact outside the baffle and the drive mechanism by the electric arc remains a technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0006] In view of this, in order to solve the above-mentioned technical problems, this utility model provides an arc extinguishing component and a circuit breaker.

[0007] To solve the above-mentioned technical problems, one of the technical solutions adopted by this utility model provides an arc-extinguishing component, which includes an air baffle and an arc-extinguishing grid assembly. The air baffle encloses a semi-enclosed space, which has an air outlet and a stationary contact alignment port. The stationary contact alignment port is used to make way so that the moving contact can contact the stationary contact. The side of the air baffle away from the air outlet is the first side of the air baffle, and the side where the air outlet is located is the second side of the air baffle. The first side of the air baffle is also provided with an air baffle plate and a moving contact clearance port. The arc-extinguishing grid assembly is provided on the second side of the air baffle and on the air outlet path.

[0008] To prevent or reduce the ejection of arc from the driven contact clearance opening, in one embodiment, the side of the baffle with the stationary contact alignment opening is designated as the third side of the baffle, and the side of the baffle away from the stationary contact alignment opening is designated as the fourth side of the baffle; the spacing direction between the first and second sides of the baffle is a first direction, and the spacing direction between the third and fourth sides of the baffle is a second direction; the baffle has a third direction perpendicular to the second and first directions; wherein, the baffle plate and the driven contact clearance opening are staggered in the third direction.

[0009] To prevent or reduce the ejection of arc from the driven contact clearance opening, in one embodiment, the gas baffle further includes a first plate and a second plate; the first plate and the second plate are spaced apart along a third direction; a semi-enclosed space, a driven contact clearance opening, a gas baffle plate, a stationary contact alignment opening and a gas outlet are disposed between the first plate and the second plate;

[0010] The baffle plate is connected to the first plate and extends toward the side where the second plate is located; the moving contact clearance opening is formed between the baffle plate and the second plate.

[0011] To prevent or reduce arc ejection from the driven contact clearance opening, in one embodiment, the driven contact clearance opening extends into a strip shape along a second direction; the baffle plate has a second width in a third direction; the driven contact clearance opening has a first width in a third direction; and the second width is greater than the first width.

[0012] In order to make way for the air baffle and avoid or reduce wear on the air baffle, in one embodiment, the moving contact clearance opening near the side wall of the second plate has a first chamfer.

[0013] To facilitate the installation and removal of the arc-extinguishing assembly on the base, in one embodiment, the side of the gas baffle with the stationary contact alignment port is designated as the third side of the gas baffle, and the side of the gas baffle away from the stationary contact alignment port is designated as the fourth side of the gas baffle; the spacing direction between the first side and the second side of the gas baffle is the first direction, and the spacing direction between the third side and the fourth side of the gas baffle is the second direction; the gas baffle has a third direction perpendicular to the second direction and the first direction.

[0014] The air baffle also includes a first plate and a second plate; the first plate and the second plate are spaced apart along a third direction; a semi-enclosed space, a moving contact clearance opening, an air baffle, a stationary contact alignment opening and an air outlet are disposed between the first plate and the second plate;

[0015] The second plate has an insertion port that exposes a semi-enclosed space. The insertion port connects to the edge of the second plate and is used to avoid the moving contact so that the moving contact can pass through the second plate.

[0016] To achieve miniaturization of the air deflector, in one embodiment, the end of the air deflector facing the fourth side of the air deflector is provided with a moving contact clearance opening that exposes a semi-enclosed space and connects to the moving contact clearance opening.

[0017] To achieve miniaturization of the air deflector, in one embodiment, the first plate has a first edge; the first edge is located on the side of the air deflector away from the second plate; the first edge has a first beveled edge and a first top edge in sequence along the direction toward the fourth side of the air deflector; the first top edge is located on the side of the first beveled edge closer to the air outlet;

[0018] The second plate has a second edge; the second edge is located on one side of the moving contact clearance opening; the second edge has a second sloping edge and a first notched edge in sequence along the direction towards the fourth side of the air baffle; the first notched edge surrounds the moving contact clearance opening;

[0019] The baffle plate includes a sloping plate portion and a top plate portion; the sloping plate portion extends along the first sloping edge, and the top plate portion extends along the top edge; the moving contact clearance opening is located between the sloping plate portion and the top plate portion.

[0020] To facilitate the installation and removal of the arc-extinguishing grid plate on the air baffle, in one embodiment, the side of the air baffle with the stationary contact alignment port is designated as the third side of the air baffle, and the side of the air baffle away from the stationary contact alignment port is designated as the fourth side of the air baffle; the spacing direction between the first side and the second side of the air baffle is the first direction, and the spacing direction between the third side and the fourth side of the air baffle is the second direction; the air baffle has a third direction perpendicular to the second direction and the first direction.

[0021] The air baffle also includes a first plate and a second plate; the first plate and the second plate are spaced apart along a third direction; a semi-enclosed space, a moving contact clearance opening, an air baffle, a stationary contact alignment opening and an air outlet are disposed between the first plate and the second plate;

[0022] The arc-extinguishing grid assembly includes multiple arc-extinguishing grids spaced apart. The second side of the first plate and the second side of the second plate are provided with arm insertion slots corresponding to the arc-extinguishing grids. The arc-extinguishing grids are provided with grid insertion arms corresponding to the arm insertion slots. The grid insertion arms are inserted into the arm insertion slots.

[0023] To facilitate gas generation, in one embodiment, the gas baffle has an undulating structure on the inner wall facing the semi-enclosed space; the undulating structure includes alternating grooves and protrusions.

[0024] To facilitate the installation and removal of the arc-extinguishing assembly on the base, in one embodiment, the gas baffle further includes a flange portion disposed on the third side and / or the fourth side of the gas baffle.

[0025] To solve the above-mentioned technical problems, another technical solution adopted by this utility model is to provide a circuit breaker, which includes a base, an arc extinguishing assembly, a moving contact and a stationary contact, wherein the stationary contact includes a stationary contact point; the arc extinguishing assembly is the aforementioned arc extinguishing assembly.

[0026] The arc extinguishing component is mounted on the base. The end of the moving contact away from the stationary contact is left outside the baffle. The end of the moving contact near the stationary contact extends into the semi-enclosed space through the moving contact clearance port and is equipped with the moving contact. The stationary contact is mounted on the base and the stationary contact alignment port is used to make way so that the moving contact and the stationary contact can make contact.

[0027] To prevent or reduce arc ejection from the moving contact clearance opening, in one embodiment, the moving contact includes a rocker arm and a welded portion; the rocker arm extends into a semi-enclosed space and is housed in a first region within the semi-enclosed space; the first region is the area exposed by the moving contact clearance opening; the welded portion is connected to the rocker arm and extends into a second region within the semi-enclosed space, the second region being the area covered by a baffle plate; the moving contact is disposed on the welded portion, located in the second region within the semi-enclosed space.

[0028] To facilitate stable coordination between the linkage and the drive mechanism, in one embodiment, the welding part is disposed on the swing arm and bent toward the side of the swing arm facing the second region.

[0029] To facilitate stable cooperation between the linkage and the drive mechanism, in one embodiment, the swing arm and the welding part are integrally formed sheet-like bent structures; the swing arm includes a connecting part located in a semi-enclosed space, a first bent part located in the moving contact clearance opening, and a linkage part located outside the air baffle; the linkage part is connected to the connecting part through the first bent part; the first bent part bends relative to the connecting part toward the side of the first region away from the second region; the linkage part is used to cooperate and link with the drive mechanism.

[0030] To facilitate stable cooperation between the linkage and the drive mechanism, in one embodiment, the linkage includes a first arm, a second arm, and a connecting arm; the end of the first arm near the air deflector is connected to the second arm via the connecting arm; the first arm and the second arm are bent relative to the connecting arm so that the first arm and the second arm are arranged parallel to each other and spaced apart relative to each other in a third direction; the end of the first arm near the air deflector is connected to the end of the first bent portion away from the connecting portion, and the first arm and the connecting portion are arranged parallel to each other.

[0031] Beneficial Effects: Unlike existing technologies, the baffle plate in this invention can block gas within a semi-enclosed space, achieving at least the following two beneficial effects. Firstly, it prevents or reduces the ejection of electric arc from the semi-enclosed space towards the portion of the moving contact located outside the baffle and the area where the drive mechanism is located. This avoids or reduces the burning of the moving contact portion outside the baffle and the drive mechanism by the electric arc. Secondly, it allows for the formation of a higher positive pressure within the semi-enclosed space, enabling the electric arc to be ejected from the outlet more promptly and extinguished by the arc-extinguishing grid assembly. This avoids or reduces the burning of the moving contact, stationary contact, and the portion of the moving contact located within the semi-enclosed space by the electric arc. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the circuit breaker of this utility model. Figure 1 Viewed from the side where the top cover is located;

[0033] Figure 2 This is a schematic diagram of the circuit breaker of this utility model after the top cover is hidden. Figure 2 Viewed from the side of the base facing the inside of the circuit breaker. Figure 2 The cross-sectional view of the corresponding area is displayed within the dashed circle, and Figure 2 The moving contact is in contact with the stationary contact;

[0034] Figure 3 This is a schematic diagram of the circuit breaker of this utility model after the top cover is hidden. Figure 3 Viewed from the side of the base facing the inside of the circuit breaker. Figure 3 The cross-sectional view of the corresponding area is displayed within the dashed circle, and Figure 3 The moving contact separates from the stationary contact;

[0035] Figure 4 This is a schematic diagram of the moving contact. Figure 4 The automatic contact head is obliquely viewed from one side of the top cover;

[0036] Figure 5 This is a schematic diagram of the assembly structure of the arc extinguishing system and the moving contact. Figure 5 It is observed from the side of the air shield facing away from the stationary contact point and the positioning port;

[0037] Figure 6 This is a structural diagram of the arc-extinguishing assembly. Figure 6 Obtained from an oblique view from the side where the first plate is located;

[0038] Figure 7 This is a structural diagram of the air deflector. Figure 7 Obtained from an oblique view from the side where the first plate is located;

[0039] Figure 8 This is a structural diagram of the air deflector. Figure 8Obtained from an oblique view from the side where the second plate is located;

[0040] Figure 9 This is a structural diagram of the air deflector. Figure 9 Viewed from below, taken from the side where the air vent is located;

[0041] Figure 10 This is a schematic diagram of the assembly of the base, contact system, and arc-extinguishing component of this utility model. Figure 10 The section line AA is marked in the middle;

[0042] Figure 11 It is along Figure 10 A schematic diagram of the cross-section obtained by cutting the circuit breaker through the center section line AA;

[0043] Figure 12 yes Figure 11 Enlarged schematic diagram of region B in the middle;

[0044] Figure 13 This is a schematic diagram of the base structure. Figure 13 Obtained from an oblique view from the side of the base facing the inside of the circuit breaker;

[0045] Figure 14 yes Figure 12 A schematic diagram of airflow direction in region B. Figure 14 The arrow with a dashed line in the middle indicates the direction of airflow;

[0046] Figure 15 This is a schematic diagram of the structure of the air baffle according to another embodiment of the present invention. Figure 15 Viewed from below, taken from the side where the air vent is located. Detailed Implementation

[0047] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0048] That is, all directional indicators (such as up, down, left, right, front, back, inside, outside, etc.) in the embodiments of this utility model are only for descriptive purposes and to explain the specific posture (as shown in the attached figure). Figure 2 and Figure 3 The relative positions and movements of the components shown below are such that if the specific posture changes, the directional indication will also change accordingly.

[0049] It should be noted that the terms "first," "second," "third," and "fourth" in the embodiments of this utility model are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first," "second," "third," and "fourth" may explicitly or implicitly include at least one of those features.

[0050] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0051] Example 1

[0052] like Figures 1-3 As shown, the circuit breaker 10 of this utility model includes a circuit breaker housing 100, a contact system 200, a drive mechanism 400, and an arc-extinguishing assembly 300. The drive mechanism 400 extends partially into the circuit breaker housing 100, and the arc-extinguishing assembly 300 is disposed within the circuit breaker housing 100. The circuit breaker housing 100 may include a base 110 and a top cover 120. The contact system 200 and the arc-extinguishing assembly 300 may be disposed on the side of the base 110 facing the top cover 120, and the top cover 120 closes onto the base 110.

[0053] The contact system 200 may include a movable moving contact 210 and a stationary contact (not shown) fixedly mounted on the base 110. The stationary contact has a stationary contact point 220. A moving contact point 211 is located at the end of the moving contact 210 near the stationary contact point 220. The movement of the moving contact 210 causes the moving contact point 211 to contact or separate from the stationary contact 220, thereby closing and opening the circuit breaker 10. Specifically, contact between the moving contact point 211 and the stationary contact 220 closes the circuit breaker 10, and separation of the moving contact point 211 from the stationary contact 220 opens the circuit breaker 10.

[0054] The drive mechanism drives the moving contact 210 to actuate, causing the moving contact 211 to contact or separate from the stationary contact 220. The drive mechanism 400 may include a handle assembly 410 and a tripping assembly 420. The drive mechanism 400 may refer to the drive mechanism 400 of existing circuit breakers, and will not be described in detail in this utility model, but only briefly.

[0055] Optionally, such as Figures 1-3 As shown, the handle assembly 410 is rotatably mounted on the base. The handle assembly 410 drives the moving contact 210 to swing by its own rotation, so that the moving contact 211 contacts or separates from the stationary contact 220, but is not limited to this. The tripping assembly 420 is connected to the moving contact 210 and is used to drive the moving contact 210 to act when a fault such as short circuit, overload, or undervoltage occurs in the circuit, so that the moving contact 211 separates from the stationary contact 220.

[0056] When the circuit breaker 10 switches from closed to open, an electric arc will be generated between the moving contact 210 and the stationary contact 220. The arc will burn the contact system 200, such as the moving contact 211, the stationary contact 220, and the moving contact 210. Therefore, an arc extinguishing component 300 is required.

[0057] Combination Figures 1-3 See 4- Figure 8 As shown, the arc-extinguishing assembly 300 includes an air baffle 310 and an arc-extinguishing grid assembly 320. The air baffle 310 encloses a semi-enclosed space 301, which has an air outlet 302 and a stationary contact alignment port 304. The stationary contact alignment port 304 is used to allow the moving contact 211 and the stationary contact 220 to make contact.

[0058] The side of the air deflector 310 facing away from the air outlet 302 is defined as the first side of the air deflector 310, and the side of the air deflector 310 with the stationary contact alignment port 304 is defined as the third side of the air deflector 310. Therefore, the side where the air outlet 302 is located is the second side of the air deflector 310, and the side of the air deflector 310 facing away from the stationary contact alignment port 304 is the fourth side of the air deflector 310. Here, the first direction is the direction of interval between the first and second sides of the air deflector 310, the second direction is the direction of interval between the third and fourth sides of the air deflector 310, and the third direction is perpendicular to the first and second directions. The air deflector 310 has a fifth side and a sixth side spaced apart along the third direction. The first direction, the second direction, and the third direction can be perpendicular to each other.

[0059] In one example, the first side of the air deflector 310 can be the front side, the second side of the air deflector 310 can be the rear side, and the first direction can be the front-back direction, but is not limited thereto. In another example, the first side of the air deflector 310 can be the left side, the second side of the air deflector 310 can be the right side, and the first direction can be the left-right direction, but is not limited thereto. That is, all directional indications (such as up, down, left, right, front, back, inside, outside, etc.) in the embodiments of this utility model are only used for descriptive purposes to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0060] The side facing away from the air outlet may face the fourth side, and the side of the air baffle 310 with the stationary contact alignment port 304 may face the second side.

[0061] Combination Figures 1-3 See 4- Figure 8As shown, the first side of the air baffle 310 is also provided with an air baffle plate 311 and a moving contact clearance port 303. The arc extinguishing grid assembly 320 is provided on the second side of the air baffle 310 and is located on the air outlet path of the air outlet 302. The end of the moving contact 210 near the stationary contact 220 extends into the semi-enclosed space 301 through the moving contact clearance port 303, and a moving contact 211 is provided corresponding to the stationary contact 220. The stationary contact 220 is provided on the base 110. The stationary contact alignment port 304 is used to make way so that the moving contact 211 and the stationary contact 220 can make contact.

[0062] The moving contact clearance opening 303 allows for the movement of the moving contact 210, enabling the moving contact 210 to move in the second direction toward or away from the stationary contact 220. When the moving contact 210 moves toward the stationary contact 220, it brings the moving contact 211 into contact with the stationary contact 220. When the moving contact 210 moves away from the stationary contact 220, it separates the moving contact 211 from the stationary contact 220.

[0063] In this invention, when the circuit breaker 10 switches from closed to open, the electric arc generated between the moving contact 211 and the stationary contact 220 burns the gas in the semi-enclosed space 301, causing the gas in the semi-enclosed space 301 to expand, thereby creating a positive pressure in the semi-enclosed space 301 relative to the outlet 302. The baffle plate 311 can block the gas in the semi-enclosed space 301, thus having at least the following two beneficial effects. First, it prevents or reduces the electric arc in the semi-enclosed space 301 from being ejected towards the part of the moving contact 210 outside the baffle 310 and the area where the drive mechanism 400 is located. This avoids or reduces the burning of the part of the moving contact 210 outside the baffle 310 and the drive mechanism 400 by the electric arc. Second, it allows a higher positive pressure to be formed in the semi-enclosed space 301, so that the electric arc can be ejected from the outlet 302 more promptly, and then extinguished by the arc-extinguishing grid assembly 320 in a timely manner. This can avoid or reduce the burning of the moving contact 211, stationary contact 220, and the portion of the moving contact 210 located in the semi-enclosed space 301 by the electric arc.

[0064] It should be noted that existing moving contacts (not shown) are generally rod-shaped with a large cross-section to ensure sufficient mechanical strength and area for mounting. Therefore, the housing adapted to this existing moving contact must be an open housing to allow the existing moving contact to extend into it. The air baffle 310 in this invention can be configured to adapt to the moving contact 210 of this invention, which will be described in more detail later when describing the moving contact 210.

[0065] Optionally, the gas shield 310 is made of a gas-generating material, which can generate gas under electric arc burning. In this way, by burning the gas shield 310 with an electric arc, a large amount of gas can be generated in the semi-enclosed space 301, so as to form a higher positive pressure in the semi-enclosed space 301.

[0066] Optionally, see 4- Figure 8 As shown, the air baffle 310 also includes a first plate 312 and a second plate 313. The first plate 312 and the second plate 313 are spaced apart along a third direction. A semi-enclosed space 301, a moving contact clearance opening 303, an air baffle 311, a stationary contact alignment opening 304, and an air outlet 302 are disposed between the first plate 312 and the second plate 313.

[0067] Optionally, combined Figures 6-8 See 10- Figure 12 As shown, the arc-extinguishing grid assembly 320 includes multiple arc-extinguishing grids 321 spaced apart. The second side of the first plate 312 and the second side of the second plate 313 are provided with arm insertion slots 314 corresponding to the arc-extinguishing grids 321. Each arc-extinguishing grid 321 has a grid insertion arm 322 corresponding to the arm insertion slot 314. The grid insertion arm 322 is inserted into the arm insertion slot 314. This facilitates the assembly of the arc-extinguishing grids 321 onto the air baffle 310.

[0068] Optionally, such as Figures 6-8 As shown, the stationary contact alignment port 304 is located on the outer periphery of the semi-enclosed space 301, communicating with the air outlet 302 and spaced apart from the moving contact clearance port 303. This simplifies the structure of the air baffle 310 and reduces production costs.

[0069] Optionally, such as Figures 6-8 As shown, in one example, the air deflector 310 includes a first connecting rod 317 and a second connecting rod 318, both of which are connected to a first plate 312 and a second plate 313, respectively. For example, and not as a limitation, the first connecting rod 317 is located on the side of the air deflector 311 closer to the stationary contact alignment port 304, and the second connecting rod 318 is located on the side of the air outlet 302 away from the stationary contact alignment port 304. Thus, the first connecting rod 317 and the second connecting rod 318 enhance the overall mechanical strength of the air deflector 310.

[0070] Alternatively, in another example, the air deflector 310 may not include the first connecting rod 317 and the second connecting rod 318. In this case, the first plate 312 and the second plate 313 are connected by the arc-extinguishing grid 321.

[0071] Optionally, combined Figures 1-3 See 4- Figure 8 As shown, the air baffle 311 and the moving contact clearance port 303 are offset in the third direction.

[0072] Combination Figures 4-5 See Figures 6-8 As shown, the baffle plate 311 is connected to the first plate 312 and extends toward the side where the second plate 313 is located. A moving contact clearance opening 303 is formed between the baffle plate 311 and the second plate 313. The moving contact 210 includes a swing arm 216 and a welding portion 215. The portion of the swing arm 216 extending into the semi-enclosed space 301 is accommodated in a first region S1 within the semi-enclosed space 301. The first region S1 is the area exposed by the moving contact clearance opening 303. The welding portion 215 is connected to the swing arm 216 and extends into a second region S2 within the semi-enclosed space 301, the second region S2 being the area covered by the baffle plate 311. The moving contact 211 is disposed on the welding portion 215, located in the second region S2 within the semi-enclosed space 301. It should be noted that the welding portion 215 is the part used for welding to the moving contact 211.

[0073] In this way, the moving contact 211 and the stationary contact 220 can be biased to generate an electric arc in the second area S2 covered by the baffle plate 311. This can make the electric arc biased to avoid the first area S1 exposed by the moving contact clearance port 303, thereby preventing or reducing the electric arc from being ejected from the moving contact clearance port 303.

[0074] Optionally, combined Figures 6-7 See Figure 8 As shown, the moving contact clearance opening 303 extends into a strip along the second direction, allowing the moving contact 210 to move along the length of the moving contact clearance opening 303. The baffle plate 311 has a width of a second width W2 in the third direction. The moving contact clearance opening 303 has a width of a first width W1 in the third direction. The second width W2 is greater than the first width W1. Thus, the baffle plate 311 can more comprehensively cover the area where the moving contact 210 is located within the semi-enclosed space 301, thereby preventing or avoiding the ejection of an electric arc from the moving contact clearance opening 303.

[0075] Preferably, combined with Figures 4-5 See Figures 10-12 As shown, the swing arm 216 and the welded part 215 are integrally formed sheet-like bent structures. The swing arm 216 includes a connecting part 212 located within the semi-enclosed space 301, a first bent part 213 located within the moving contact clearance opening 303, and a linkage part 214 located outside the air deflector 310. The linkage part 214 is connected to the connecting part 212 via the first bent part 213. The drive mechanism 400 cooperates with the linkage part 214 to cause the swing arm 216 to swing under the drive of the drive mechanism 400. The moving contact 211 is connected to the welded part 215.

[0076] The side wall of the second plate 313 has a first chamfer 305 corresponding to the moving contact clearance opening 303; the first bending portion 213 extends following the first chamfer 305 to bend relative to the connecting portion 212 toward the side where the second plate 313 is located.

[0077] Through the above-described method, the integrated sheet-like bent structure of the swing arm 216 and the welded part 215, along with the configuration of the first bent part 213 and the first chamfer 305, has at least the following three beneficial effects. Firstly, it allows the first bent part 213 to be spaced apart from the baffle plate 311, meaning the first bent part 213 makes way for the baffle plate 311. This leaves sufficient clearance between the first bent part 213 and the first chamfer 305, thus avoiding or reducing jamming caused by the first bent part 213 obstructing the baffle plate 311 and preventing the brake from closing. Secondly, it reduces the production cost and overall weight of the swing arm 216 and the welded part 215, and facilitates a smaller design for the first width W1. Thirdly, the arrangement of the first bent part 213 ensures that the linkage part 214 has sufficient width along a third direction, facilitating stable cooperation between the linkage part 214 and the drive mechanism.

[0078] Optionally, combined Figures 4-5 See Figures 10-12 As shown, the welding portion 215 is disposed on the connecting portion 212 and bent toward the side where the first plate 312 is located, and the moving contact 211 is disposed on the welding portion 215. The welding portion 215 and the connecting portion 212 are connected in an approximately L-shape. The moving contact 211 is welded to the welding portion 215. It should be noted that the welding portion 215 is the part used for welding with the moving contact 211. Thus, the welding portion 215 has sufficient area to weld the moving contact 211.

[0079] Optionally, combined Figures 4-5 See Figures 10-12 As shown, the vent 302 exposes the first region S1 and the second region S2 within the semi-enclosed space 301. By way of example, and not limitation, the vent 302 is open to expose the first region S1 and the second region S2 within the semi-enclosed space 301. This reduces the airflow resistance of the vent 302, facilitating the positive air pressure within the semi-enclosed space 301 to propel the electric arc through the vent 302 to the arc-extinguishing grid assembly 320, where the arc-extinguishing grid 321 can be used for arc extinguishing.

[0080] Combination Figures 1-9 See Figure 13As shown, when the moving contact 211 is in contact with the stationary contact 220, the position of the moving contact 211 is defined as the first position, and when the moving contact 211 is separated from the stationary contact 220, the position of the moving contact 211 is defined as the second position. The second plate 313 is provided with an insertion port 315 that exposes the semi-enclosed space 301, and the insertion port 315 is connected to the edge of the second plate 313. The base 110 has a protruding insertion protrusion 130 that is inserted into the insertion port 315. Optionally, the insertion port 315 is connected to the edge of the second plate 313 near the moving contact clearance port 303, but is not limited to this.

[0081] The insertion port 315 is used to avoid the end of the moving contact 210 where the moving contact 211 is located. When the moving contact 211 is in the second position, the end of the moving contact 210 where the moving contact 211 is located is aligned with the insertion port 315 so that the end of the moving contact 210 where the moving contact 211 is located can enter or exit the semi-enclosed space 301 through the insertion port 315.

[0082] In the above manner, when the moving contact 211 is in the second position, the insertion port 315 of the arc extinguishing component 300 is aligned with the insertion protrusion 130, and the arc extinguishing component 300 is pressed against the base 110, so that the insertion protrusion 130 can be inserted into the insertion port 315, thereby realizing the convenient assembly of the arc extinguishing component 300 on the base 110.

[0083] Example 2

[0084] Example 2 is a further limitation of Example 1. The parts of Example 2 that are the same as in Example 1 will not be repeated. The difference between Example 2 and Example 1 is that the moving contact 210 can swing, causing the moving contact 211 to contact or separate from the stationary contact 220. The position of the moving contact 211 when it is in contact with the stationary contact 220 is defined as the first position, and the position of the moving contact 211 when it is separated from the stationary contact 220 is defined as the second position.

[0085] Optionally, combined Figures 6-9 See Figure 3 As shown, the end of the baffle plate 311 facing the fourth side of the baffle cover 310 is provided with a moving contact clearance port 306 that exposes a semi-enclosed space 301 and connects to the moving contact clearance port 303. The moving contact clearance port 306 can be provided corresponding to the insertion port 315.

[0086] The moving contact clearance opening 306 is used to avoid the end of the moving contact 210 where the moving contact 211 is located. When the moving contact 211 is in the second position, a portion of the end of the moving contact 210 where the moving contact 211 is located is accommodated in the moving contact clearance opening 306. For example, when the moving contact 211 is in the second position, a portion of the welded part 215 and a portion of the moving contact 211 are accommodated in the moving contact clearance opening 306. In this way, at least the following two advantages are achieved: First, by avoiding the end of the moving contact 210 where the moving contact 211 is located, the moving contact clearance opening 306 can prevent wear caused by the welded part 215 or the moving contact 211 colliding with the baffle plate 311. Secondly, when the moving contact 211 is in the second position, the moving contact clearance opening 306 accommodates a portion of one end of the moving contact 210 where the moving contact 211 is located, which can reduce the space occupied by the air baffle 310 and achieve miniaturization of the air baffle 310.

[0087] Optionally, such as Figure 8 As shown, the two ends of the connection between the moving contact clearance port 306 and the moving contact clearance port 303 are provided with a second chamfer 3061, which makes it easier for the moving contact clearance port 306 to avoid the end of the moving contact 210 where the moving contact 211 is provided.

[0088] Optionally, combined Figures 1-5 , Figures 7-8 See Figures 10-12 As shown, the linkage 214 includes a first arm 2141, a second arm 2142, and a connecting arm 2143. The end of the first arm 2141 near the air deflector 310 is connected to the second arm 2142 via the connecting arm 2143. The first arm 2141 and the second arm 2142 are bent relative to the connecting arm 2143, so that the first arm 2141 and the second arm 2142 are parallel and spaced apart relative to each other in a third direction. The end of the first arm 2141 near the air deflector 310 is connected to the end of the first bent portion 213 away from the connecting portion 212, and the first arm 2141 is parallel to the connecting portion 212. A driving device cooperates with the ends of both the first arm 2141 and the second arm 2142 away from the air deflector 310 to drive the moving contact 210 to swing.

[0089] The above method has at least two beneficial effects. First, the end of the first arm 2141 near the air deflector 310 is connected to the end of the first bent portion 213 away from the connecting portion 212, and the first arm 2141 and the connecting portion 212 are arranged parallel to each other, which allows for a sufficient width to be separated between the first arm 2141 and the second arm 2142 in a third direction, so as to facilitate stable cooperation between the linkage portion 214 and the drive mechanism. Second, it can reduce the production cost of the swing arm 216 and reduce the overall weight of the swing arm 216, and facilitate the small-size design of the first width W1.

[0090] It should be noted that the handle assembly 410 can be coupled with one end of the first arm 2141 away from the connecting part 212 and the other end of the second arm 2142 away from the connecting part 212, so that the swing arm 216 swings under the drive of the handle assembly 410. The release assembly 420 can be coupled with the linkage part 214, so that the swing arm 216 swings under the drive of the release assembly 420.

[0091] Optionally, such as Figures 6-9 As shown, the first plate 312 has a first edge 308. The first edge 308 is located on the side of the air deflector 311 away from the second plate 313. The first edge 308 has a first sloping edge 3081 and a first top edge 3082 in sequence along the direction toward the fourth side of the air deflector 310. The first top edge 3082 is located on the side of the first sloping edge 3081 near the air outlet 302.

[0092] like Figures 6-9 As shown, the second plate 313 has a second edge 309. The second edge 309 is located on one side of the moving contact clearance opening 303. The second edge 309 has a second sloping edge 3091 and a first notched edge 3092 in sequence along the direction toward the fourth side of the air deflector 310. The first notched edge 3092 surrounds the moving contact clearance opening 306.

[0093] The air baffle 311 includes a sloping plate portion 3111 and a top plate portion 3112. The sloping plate portion 3111 extends along the first slope edge 3081, and the top plate portion 3112 extends along the top edge. The moving contact clearance opening 306 is located between the sloping plate portion 3111 and the top plate portion 3112.

[0094] Through the above-described arrangement of the first beveled edge 3081, the second beveled edge 3091, and the inclined plate portion 3111, the gas baffle 310 can avoid the connecting arm portion 2143, the moving contact 211, and the weld portion 215 when the moving contact 210 swings and switches between the first and second positions. Furthermore, the portion of the moving contact 210 located outside the gas baffle 310 can be more compactly arranged with the gas baffle 310, thereby facilitating the miniaturization of the circuit breaker 10.

[0095] Example 3

[0096] Example 3 is derived by further defining Example 1 or Example 2. The parts in Example 3 that are the same as those in Example 1 or Example 2 will not be repeated. The difference between Example 3 and Example 1 or Example 2 is that...

[0097] Combination Figures 1-9 See Figure 13As shown, the air baffle 310 also includes a flange portion 316, which protrudes from the third side and / or the fourth side of the air baffle 310. A retaining groove 112 is provided on the inner side of the base 110 corresponding to the flange portion 316, and a grid plate insertion groove 111 is provided on the inner side of the base 110 corresponding to the arc-extinguishing grid plate 321. The flange portion 316 is inserted into the retaining groove 112, and the arc-extinguishing grid plate 321 is inserted into the grid plate insertion groove 111.

[0098] Specifically, the flange portion 316 can slide along the retaining groove 112 in the direction of retraction from the base 110, the arc-extinguishing grid plate 321 can slide along the grid plate insertion groove 111 in the direction of retraction from the base 110, and the insertion port 315 can slide along the insertion protrusion 130 in the direction of retraction from the base 110, so as to remove the arc-extinguishing assembly 300 from the base 110. This enables convenient disassembly of the arc-extinguishing assembly 300.

[0099] By aligning the flange 316 with the retaining groove 112, the arc-extinguishing grid 321 with the grid insertion groove 111, and the insertion port 315 with the insertion protrusion 130, and pressing the arc-extinguishing assembly 300 against the inner side of the base 110, the flange 316 can be inserted into the retaining groove 112, the arc-extinguishing grid 321 can be inserted into the grid insertion groove 111, and the insertion protrusion 130 can be inserted into the insertion port 315. This allows for convenient installation of the arc-extinguishing assembly 300.

[0100] Optionally, a gas guiding channel 101 is provided inside the circuit breaker housing 100. The first end of the gas guiding channel 101 extends to the area where the arc extinguishing component 300 is located, and the second end of the gas guiding channel 101 extends to communicate with the outside of the circuit breaker housing 100. The side of the gas baffle 310 with the gas baffle plate 311 is located on the side of the gas baffle 30 opposite to the second end of the gas guiding channel 101 along the extending direction of the gas guiding channel 101, so as to prevent gas in the gas guiding channel 101 from flowing out from the first end of the gas guiding channel 101.

[0101] The above method has at least two beneficial effects. First, the gas in the gas guide channel 101 is confined to flow out of the circuit breaker housing 100 from the second end of the gas guide channel 101, which helps to reduce the temperature inside the circuit breaker housing 100. Second, it can reduce or avoid the burning of the portion of the moving contact 210 located outside the gas baffle 310 and the drive mechanism caused by the electric arc generated between the moving contact 211 and the stationary contact 220.

[0102] Optionally, combined Figures 6-9 See Figures 10-14 An air guide gap 102 is formed between the air baffle 310 and the base 110 and / or between the air baffle 310 and the upper cover 120. The air guide gap 102 is connected to the portion of the air guide channel 101 located between the second end of the air baffle 310 and the air guide channel 101.

[0103] Example 4

[0104] Example 4 is derived by further defining any one of Examples 1 to 3. The parts of Example 4 that are the same as those of Examples 1 to 3 will not be repeated. The differences between Example 4 and Examples 1 to 3 are as follows.

[0105] contrast Figures 6-9 See Figure 15 As shown, the air baffle 310 has a concave-convex structure 307 on the inner wall facing the semi-enclosed space 301. For example, but not limited to, the inner walls of the first plate 312 and / or the second plate 313 may have the concave-convex structure 307, but are not limited thereto. In some examples, the inner wall of the air baffle 311 may have the concave-convex structure 307. This concave-convex structure 307 increases the contact area between the electric arc and the first plate 312 and / or the second plate 313 when the electric arc burns them, thereby increasing the gas output and creating a higher positive pressure within the semi-enclosed space 301, which in turn propels the electric arc out of the outlet 302. The concave-convex structure 307 may include alternating grooves 3071 and protrusions 3072.

[0106] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that any changes in form and detail made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims fall within the protection scope of the present invention.

Claims

1. An arc-extinguishing component, characterized in that, The arc-extinguishing assembly includes an air baffle and an arc-extinguishing grid assembly. The air baffle forms a semi-enclosed space, which has an air outlet and a stationary contact alignment port. The stationary contact alignment port is used to allow the moving contact to make contact with the stationary contact. The side of the air baffle away from the air outlet is designated as the first side of the air baffle, and the side where the air outlet is located is designated as the second side of the air baffle. The first side of the air baffle is also provided with an air baffle plate and a moving contact clearance port. The arc-extinguishing grid assembly is provided on the second side of the air baffle and on the air outlet path.

2. The arc-extinguishing assembly according to claim 1, characterized in that, The side of the air baffle where the stationary contact alignment opening is located is designated as the third side of the air baffle, and the side of the air baffle facing away from the stationary contact alignment opening is designated as the fourth side of the air baffle; the spacing direction between the first and second sides of the air baffle is designated as the first direction, and the spacing direction between the third and fourth sides of the air baffle is designated as the second direction; the air baffle has a third direction perpendicular to the second direction and the first direction; wherein, the air baffle plate and the moving contact clearance opening are staggered in the third direction.

3. The arc-extinguishing assembly according to claim 2, characterized in that, The air baffle also includes a first plate and a second plate; the first plate and the second plate are spaced apart along the third direction; the semi-enclosed space, the moving contact clearance opening, the air baffle, the stationary contact alignment opening and the air outlet are disposed between the first plate and the second plate; The air baffle is connected to the first plate and extends toward the side where the second plate is located; the movable contact clearance is formed between the air baffle and the second plate.

4. The arc-extinguishing assembly according to claim 3, characterized in that, The moving contact clearance opening has a first chamfer near the side wall of the second plate.

5. The arc-extinguishing assembly according to claim 2, characterized in that, The moving contact clearance extends into a strip along the second direction; the baffle plate has a second width in the third direction; the moving contact clearance has a first width in the third direction; the second width is greater than the first width.

6. The arc-extinguishing assembly according to claim 1, characterized in that, The side of the air baffle where the stationary contact alignment opening is located is designated as the third side of the air baffle, and the side of the air baffle facing away from the stationary contact alignment opening is designated as the fourth side of the air baffle; the spacing direction between the first side and the second side of the air baffle is designated as the first direction, and the spacing direction between the third side and the fourth side of the air baffle is designated as the second direction; the air baffle has a third direction perpendicular to the second direction and the first direction. The air baffle also includes a first plate and a second plate; the first plate and the second plate are spaced apart along the third direction; the semi-enclosed space, the moving contact clearance opening, the air baffle, the stationary contact alignment opening and the air outlet are disposed between the first plate and the second plate; The second plate is provided with an insertion port that exposes the semi-enclosed space. The insertion port is connected to the edge of the second plate and is used to avoid the moving contact so that the moving contact can pass through the second plate.

7. The arc-extinguishing assembly according to claim 6, characterized in that, The end of the baffle plate facing the fourth side of the baffle cover is provided with a moving contact clearance port that exposes the semi-enclosed space and connects to the moving contact clearance port.

8. The arc-extinguishing assembly according to claim 7, characterized in that, The first plate has a first edge; the first edge is located on the side of the baffle plate away from the second plate; the first edge has a first sloping edge and a first top edge in sequence along the direction toward the fourth side of the baffle; the first top edge is located on the side of the first sloping edge closer to the air outlet; The second plate has a second edge; the second edge is located on one side of the moving contact clearance opening; the second edge has a second sloping edge and a first notched edge in sequence along the direction toward the fourth side of the air baffle; the first notched edge surrounds the moving contact clearance opening; The baffle plate includes an inclined plate portion and a top plate portion; the inclined plate portion extends along the first sloping edge, and the top plate portion extends along the top edge; the moving contact clearance opening is located between the inclined plate portion and the top plate portion.

9. The arc-extinguishing assembly according to claim 1, characterized in that, The side of the air baffle where the stationary contact alignment opening is located is designated as the third side of the air baffle, and the side of the air baffle facing away from the stationary contact alignment opening is designated as the fourth side of the air baffle; the spacing direction between the first side and the second side of the air baffle is designated as the first direction, and the spacing direction between the third side and the fourth side of the air baffle is designated as the second direction; the air baffle has a third direction perpendicular to the second direction and the first direction. The air baffle also includes a first plate and a second plate; the first plate and the second plate are spaced apart along the third direction; the semi-enclosed space, the moving contact clearance opening, the air baffle, the stationary contact alignment opening and the air outlet are disposed between the first plate and the second plate; The arc-extinguishing grid assembly includes multiple arc-extinguishing grids spaced apart. The second side of the first plate and the second side of the second plate are provided with arm insertion slots corresponding to the arc-extinguishing grids. The arc-extinguishing grids are provided with grid insertion arms corresponding to the arm insertion slots. The grid insertion arms are inserted into the arm insertion slots.

10. The arc-extinguishing assembly according to claim 1, characterized in that, The air deflector has a concave-convex structure on the inner wall facing the semi-enclosed space; the concave-convex structure includes alternating grooves and protrusions.

11. The arc-extinguishing assembly according to claim 1, characterized in that, The air deflector also includes a flange portion, which is disposed on the third side and / or the fourth side of the air deflector.

12. A circuit breaker, characterized in that, The circuit breaker includes a base, an arc-extinguishing assembly, a moving contact, and a stationary contact, wherein the stationary contact includes a stationary contact point; the arc-extinguishing assembly is the arc-extinguishing assembly described in any one of claims 1-11 above. The arc extinguishing component is disposed on the base. The end of the moving contact away from the stationary contact is retained outside the air baffle. The end of the moving contact near the stationary contact extends into the semi-enclosed space through the moving contact clearance opening and is provided with a moving contact. The stationary contact is disposed on the base, and the stationary contact alignment opening is used to make way so that the moving contact and the stationary contact can make contact.

13. The circuit breaker according to claim 12, characterized in that, The moving contact includes a swing arm and a welded part; the swing arm extends into the semi-enclosed space and is housed in a first region within the semi-enclosed space; the first region is the area exposed by the moving contact clearance opening; the welded part is connected to the swing arm and extends into a second region within the semi-enclosed space, the second region being the area covered by the baffle plate; the moving contact is disposed on the welded part, located in the second region within the semi-enclosed space.

14. The circuit breaker according to claim 13, characterized in that, The welded part is disposed on the swing arm and bent towards the side of the swing arm toward the second region.

15. The circuit breaker according to claim 14, characterized in that, The swing arm and the welded part are integrally formed sheet-like bent structures; the swing arm includes a connecting part located in the semi-enclosed space, a first bent part located in the moving contact clearance opening, and a linkage part located outside the air baffle; the linkage part is connected to the connecting part through the first bent part; the first bent part bends relative to the connecting part toward the side of the first region away from the second region; the linkage part is used to cooperate with the drive mechanism.

16. The circuit breaker according to claim 15, characterized in that, The linkage includes a first arm, a second arm, and a connecting arm; the end of the first arm near the air deflector is connected to the second arm via the connecting arm; the first arm and the second arm are bent relative to the connecting arm so that the first arm and the second arm are arranged parallel to each other and spaced apart in a third direction; the end of the first arm near the air deflector is connected to the end of the first bent arm away from the connecting arm, and the first arm is arranged parallel to the connecting arm.

Images