Arc extinguishing assembly and circuit breaker

Abstract

The invention 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 invention, the arc can be driven to be ejected 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] The present invention relates to the technical field of circuit breakers, and in particular to an arc extinguishing assembly and a circuit breaker. Background Art

[0002] As a kind of circuit protection device, the circuit breaker is mainly used in low-voltage power systems. The circuit breaker generally extinguishes the arc by setting an arc extinguishing component.

[0003] The arc extinguishing assembly generally includes an open shell and an arc extinguishing grid group. The open shell has an open space, and the two sides of the open space are open to form a first side opening and a second side opening. The moving contact extends into the open space from the first side opening. The movement of the moving contact moves the moving contact in the open space so that the moving contact contacts or separates from the static contact to achieve the closing and opening of the circuit breaker. The arc extinguishing grid group is arranged on the side where the second side opening is located.

[0004] Gas blowing arc extinguishing is a commonly used arc extinguishing method. Specifically, the material of the open housing can be a gas-generating material. When the circuit breaker switches from closing to opening, an arc will be generated between the moving contact and the static contact. The arc will burn the open housing, and a large amount of gas generated will form a positive air pressure in the open space relative to the second side opening. The positive air pressure pushes the arc into the arc extinguishing grid group to accelerate the arc extinguishing process.

[0005] However, how to drive the arc to eject from the air outlet more timely to further accelerate the arc extinguishing effect and avoid or reduce the burning of the moving contact part outside the air shield and the driving mechanism by the arc is still a technical problem that technical personnel in this field urgently need to solve. Summary of the invention

[0006] In view of this, in order to solve the above technical problems, the present invention provides an arc extinguishing assembly and a circuit breaker.

[0007] In order to solve the above-mentioned technical problems, one of the technical solutions adopted by the present invention provides an arc extinguishing component, which includes an air shielding hood and an arc extinguishing grid group; the air shielding hood encloses a semi-enclosed space, and the semi-enclosed space has an air outlet and a static contact alignment port; the static contact alignment port is used to make way so that the moving contact can contact the static contact; the side of the air shielding hood away from the air outlet is the first side of the air shielding hood, and the side where the air outlet is located is the second side of the air shielding hood; the first side of the air shielding hood is also provided with an air shield plate and a moving contact avoidance port; the second side of the air shielding hood and located on the air outlet path of the air outlet is provided with an arc extinguishing grid group.

[0008] In order to prevent or reduce the arc from being ejected from the moving contact avoidance port, in one embodiment, the side of the air shielding hood provided with the static contact alignment port is the third side of the air shielding hood, and the side of the air shielding hood away from the static contact alignment port is the fourth side of the air shielding hood; the spacing direction between the first side and the second side of the air shielding hood is the first direction, and the spacing direction between the third side and the fourth side of the air shielding hood is the second direction; the air shielding hood has a third direction perpendicular to the second direction and the first direction; wherein, the air shielding plate and the moving contact avoidance port are staggered in the third direction.

[0009] In order to prevent or reduce the arc from being ejected from the moving contact avoidance port, in one embodiment, the air shield further comprises a first plate body and a second plate body; the first plate body and the second plate body are arranged at intervals along the third direction; the semi-enclosed space, the moving contact avoidance port, the air shield plate, the static contact alignment port and the air outlet are arranged between the first plate body and the second plate body;

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

[0011] In order to prevent or reduce the arc from being ejected from the moving contact avoidance opening, in one embodiment, the moving contact avoidance opening extends into a long strip along the second direction; the width of the air baffle in the third direction is the second width; the width of the moving contact avoidance opening in the third direction is the first width; and the second width is greater than the first width.

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

[0013] In order to facilitate the disassembly and assembly of the arc extinguishing assembly on the base, in one embodiment, the side of the air shield provided with the static contact alignment opening is the third side of the air shield, and the side of the air shield away from the static contact alignment opening is the fourth side of the air shield; the spacing direction between the first side and the second side of the air shield is the first direction, and the spacing direction between the third side and the fourth side of the air shield is the second direction; the air shield has a third direction perpendicular to the second direction and the first direction;

[0014] The air baffle also includes a first plate body and a second plate body; the first plate body and the second plate body are arranged at intervals along the third direction; the semi-enclosed space, the moving contact avoidance port, the air baffle plate, the static contact alignment port and the air outlet are arranged between the first plate body and the second plate body;

[0015] The second plate body is provided with an insertion opening exposing the semi-enclosed space, the insertion opening is connected to the edge of the second plate body, and the insertion opening is used to avoid the moving contact so that the moving contact can pass through the second plate body.

[0016] In order to miniaturize the air baffle, in one embodiment, a moving contact avoidance opening exposing the semi-enclosed space and communicating with the moving contact avoidance opening is provided at one end of the air baffle plate facing the fourth side of the air baffle.

[0017] In order to miniaturize the air shield, in one embodiment, the first plate body has a first edge; the first edge is located at a side of the air shield away from the second plate body; the first edge has a first slope edge and a first top edge in sequence along a direction toward a fourth side of the air shield; the first top edge is located at a side of the first slope edge close to the air outlet;

[0018] The second plate body has a second edge; the second edge is located at one side of the moving contact avoidance opening; the second edge has a second slope edge and a first notch edge in sequence along the direction toward the fourth side of the air shield; the first notch edge encloses the moving contact avoidance opening;

[0019] The air baffle plate includes an inclined plate portion and a top plate portion; the inclined plate portion extends along the first slope edge, and the top plate portion extends along the top edge; the moving contact avoidance opening is located between the inclined plate portion and the top plate portion.

[0020] In order to facilitate the disassembly and assembly of the arc extinguishing grid on the air shield, in one embodiment, the side of the air shield provided with the static contact alignment opening is the third side of the air shield, and the side of the air shield away from the static contact alignment opening is the fourth side of the air shield; the spacing direction between the first side and the second side of the air shield is the first direction, and the spacing direction between the third side and the fourth side of the air shield is the second direction; the air shield has a third direction perpendicular to the second direction and the first direction;

[0021] The air baffle also includes a first plate body and a second plate body; the first plate body and the second plate body are arranged at intervals along the third direction; the semi-enclosed space, the moving contact avoidance port, the air baffle plate, the static contact alignment port and the air outlet are arranged between the first plate body and the second plate body;

[0022] Among them, the arc extinguishing grid group includes a plurality of arc extinguishing grids arranged at intervals, and the second side of the first plate body and the second side of the second plate body are provided with arm plug-in grooves corresponding to the arc extinguishing grids; the arc extinguishing grids are provided with grid plug-in arms corresponding to the arm plug-in grooves; the grid plug-in arms are inserted into the arm plug-in grooves.

[0023] In order to facilitate gas production, in one embodiment, a concave-convex structure is provided on the inner wall of the gas shield facing the semi-enclosed space; the concave-convex structure includes grooves and convex blocks arranged alternately.

[0024] In order to facilitate the disassembly and assembly of the arc extinguishing assembly on the base, in one embodiment, the gas shield further includes a flange portion, and the flange portion is arranged on the third side of the gas shield and / or the fourth side of the gas shield.

[0025] In order to solve the above technical problems, another technical solution adopted by the present invention is to provide a circuit breaker, the circuit breaker includes a base, an arc extinguishing assembly, a moving contact and a stationary contact, the stationary contact includes a stationary contact point; the arc extinguishing assembly is the above arc extinguishing assembly;

[0026] Among them, the arc extinguishing assembly is arranged on the base, the end of the moving contact away from the static contact is retained outside the air shield, and the end of the moving contact close to the static contact extends into the semi-enclosed space through the moving contact avoidance opening and is provided with a moving contact; the static contact is arranged on the base and the static contact alignment opening is used to make way so that the moving contact and the static contact can contact.

[0027] In order to prevent or reduce the arc from being ejected from the moving contact avoidance port, in one embodiment, the moving contact includes a swing arm and a welding portion; the swing arm extends into the semi-enclosed space and is accommodated in a first area within the semi-enclosed space; the first area is an area exposed by the moving contact avoidance port; the welding portion is connected to the swing arm and extends to a second area within the semi-enclosed space, and the second area is an area covered by an air baffle; the moving contact is arranged at the welding portion to be located in the second area within the semi-enclosed space.

[0028] In order to facilitate stable cooperation between the linkage part and the driving mechanism, in one embodiment, the welding part is arranged on the swing arm and is bent toward a side of the swing arm facing the second area.

[0029] In order to facilitate stable cooperation between the linkage part and the driving mechanism, in one embodiment, the swing arm and the welding part are an integrally formed sheet-like bending structure; the swing arm includes a connecting part located in the semi-enclosed space, a first bending part located at the moving contact avoidance port, and a linkage part located outside the air shield; the linkage part is connected to the connecting part through the first bending part; the first bending part is bent relative to the connecting part toward the side where the second plate is located.

[0030] In order to facilitate stable cooperation between the linkage part and the driving mechanism, in one embodiment, the linkage part includes a first arm part, a second arm part and a connecting arm part; the end of the first arm part close to the air shield is connected to the second arm part through the connecting arm part; the first arm part and the second arm part are bent relative to the connecting arm part so that the first arm part and the second arm part are arranged in parallel and relatively spaced along the third direction; the end of the first arm part close to the air shield is connected to the end of the first bent part away from the connecting part, and the first arm part and the connecting part are arranged in parallel.

[0031] Beneficial effects: Different from the prior art, the air baffle in the present invention can block the gas in the semi-enclosed space, so as to have at least the following two beneficial effects. First, it prevents or reduces the arc in the semi-enclosed space from spraying toward the portion of the moving contact outside the air baffle and the area where the driving mechanism is located. In this way, it can avoid or reduce the burning of the moving contact outside the air baffle and the driving mechanism by the arc. Second, it enables a higher positive pressure to be formed in the semi-enclosed space, so as to drive the arc to spray out from the air outlet more timely, and then extinguish the arc in time through the arc extinguishing grid group. In this way, it can avoid or reduce the burning of the moving contact, the static contact, and the portion of the moving contact located in the semi-enclosed space by the arc. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic structural diagram of a circuit breaker of the present invention, Figure 1 Obtained by looking obliquely from the side where the upper cover is located;

[0033] Figure 2 is a schematic diagram of the structure of the circuit breaker of the present invention after the upper cover is hidden. Figure 2 Viewed from the side of the base facing the inside of the circuit breaker, Figure 2 The cross-section of the corresponding area is shown in the dotted circle. Figure 2 The moving contact contacts the stationary contact;

[0034] Figure 3 is a schematic diagram of the structure of the circuit breaker of the present invention after the upper cover is hidden. Figure 3 Viewed from the side of the base facing the inside of the circuit breaker, Figure 3 The cross-section of the corresponding area is shown in the dotted circle. Figure 3 The moving contact is separated from the static contact;

[0035] Figure 4 It is a structural diagram of the moving contact. Figure 4 The automatic contact is obtained by looking obliquely toward the side of the upper cover;

[0036] Figure 5 It is a schematic diagram of the assembly structure of the arc extinguishing system and the moving contact. Figure 5 Observe from the side of the air shield facing away from the static contact alignment port;

[0037] Figure 6 It is a schematic diagram of the structure of the arc extinguishing component. Figure 6 Obtained by looking obliquely from the side where the first plate is located;

[0038] Figure 7 It is a schematic diagram of the structure of the air shield. Figure 7 Obtained by looking obliquely from the side where the first plate is located;

[0039] Figure 8 It is a schematic diagram of the structure of the air shield. Figure 8Obtained by looking obliquely from the side where the second plate is located;

[0040] Fig. 9 It is a schematic diagram of the structure of the air shield. Fig. 9 Look up from the side where the air outlet is located;

[0041] Fig.10 It is a schematic diagram of the structure of the base, contact system and arc extinguishing assembly of the present invention assembled together, Fig.10 The section line AA is marked in the figure;

[0042] Fig.11 is along Fig.10 A schematic cross-sectional view of the circuit breaker cut along the center cutting line AA;

[0043] Fig.12 yes Fig.11 A magnified schematic diagram of the middle area B;

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

[0045] Fig.14 yes Fig.12 Schematic diagram of airflow direction in area B. Fig.14 The dashed arrows in the middle indicate the airflow direction;

[0046] Fig.15 is a schematic structural diagram of an air shield according to another embodiment of the present invention, Fig.15 Viewed from the side where the air outlet is located. DETAILED DESCRIPTION

[0047] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which 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 contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0048] That is, all directional indications (such as up, down, left, right, front, back, inside, outside, etc.) in the embodiments of the present invention are only used for the purpose of convenience of description, and the explanation of a particular posture (such as the attached Figure 2 and Figure 3 The relative position relationship, movement status, etc. between the various components under the specific posture are shown. 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 the present invention are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", "third", and "fourth" may explicitly or implicitly include at least one of the features.

[0050] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0051] Embodiment 1

[0052] like Figure 1-Figure 3 As shown, the circuit breaker 10 of the present invention includes a circuit breaker housing 100, a contact system 200, a driving mechanism 400 and an arc extinguishing assembly 300. The driving mechanism 400 partially extends into the circuit breaker housing 100, and the arc extinguishing assembly 300 is disposed in the circuit breaker housing 100. The circuit breaker housing 100 may include a base 110 and an upper cover 120, the contact system 200 and the arc extinguishing assembly 300 may be disposed on a side of the base 110 facing the upper cover 120, and the upper cover 120 covers the base 110.

[0053] The contact system 200 may include a movable moving contact 210 and a stationary contact (not shown) fixedly disposed on the base 110, and the stationary contact is provided with a stationary contact 220. A moving contact 211 is provided at one end of the moving contact 210 close to the stationary contact 220, and the moving contact 210 moves so that the moving contact 211 contacts or separates from the stationary contact 220 to achieve the closing and opening of the circuit breaker 10. Specifically, the moving contact 211 contacts with the stationary contact 220 to achieve the closing of the circuit breaker 10, and the moving contact 211 separates from the stationary contact 220 to achieve the opening of the circuit breaker 10.

[0054] The driving mechanism drives the moving contact 210 to move so that the moving contact 211 contacts or separates from the static contact 220. The driving mechanism 400 may include a handle assembly 410 and a trip assembly 420. The driving mechanism 400 may refer to the driving mechanism 400 of the existing circuit breaker, and in the present invention, no further explanation is given, and only a brief introduction is given.

[0055] Alternatively, if Figure 1-Figure 3 As shown, the handle assembly 410 is rotatably disposed on the base, and the handle assembly 410 drives the moving contact 210 to swing by its own rotation, so that the moving contact 211 contacts or separates with the static contact 220, but is not limited thereto. The trip assembly 420 is connected to the moving contact 210, and is used to drive the moving contact 210 to operate when a short circuit, overload, undervoltage or other fault occurs in the circuit, so that the moving contact 211 separates with the static contact 220.

[0056] When the circuit breaker 10 switches from closing to opening, an arc will be generated between the moving contact 210 and the stationary contact 220, and 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 assembly 300 needs to be provided.

[0057] Combination Figure 1-Figure 3 , see 4- Figure 8 As shown, the arc extinguishing assembly 300 includes an air shield 310 and an arc extinguishing grid assembly 320. The air shield 310 encloses a semi-enclosed space 301, and the semi-enclosed space 301 has an air outlet 302 and a static contact alignment opening 304. The static contact alignment opening 304 is used to make way so that the moving contact 211 and the static contact 220 can contact each other.

[0058] The side of the air shield 310 facing away from the air outlet 302 is defined as the first side of the air shield 310, and the side of the air shield 310 provided with the static contact alignment port 304 is defined as the third side of the air shield 310. Thus, the side where the air outlet 302 is located is the second side of the air shield 310, and the side of the air shield 310 facing away from the static contact alignment port 304 is the fourth side of the air shield 310. The first direction is the spacing direction between the first side and the second side of the air shield 310, the second direction is the spacing direction between the third side and the fourth side of the air shield 310, the third direction is perpendicular to the first direction and the second direction, and the air shield 310 has a fifth side and a sixth side arranged at intervals along the third direction. The first direction, the second direction and the third direction may be perpendicular to each other.

[0059] In one example, the first side of the air shield 310 may be the front side, the second side of the air shield 310 may be the rear side, and the first direction may be the front-to-back direction, but is not limited thereto. In another example, the first side of the air shield 310 may be the left side, the second side of the air shield 310 may be the right side, and the first direction may be the left-to-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 the present invention are only used for the purpose of facilitating description, explaining the relative positional relationship, movement status, etc. between the components in a certain specific posture, and 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 shield 310 provided with the static contact alignment opening 304 may face the second side.

[0061] Combination Figure 1-Figure 3 , see 4- Figure 8As shown, the first side of the air shield 310 is also provided with an air shield plate 311 and a moving contact avoidance opening 303. The arc extinguishing grid group 320 is arranged on the second side of the air shield 310 and is located on the air outlet path of the air outlet 302. One end of the moving contact 210 close to the static contact 220 extends into the semi-enclosed space 301 through the moving contact avoidance opening 303 and a moving contact 211 is arranged corresponding to the static contact 220. The static contact 220 is arranged on the base 110. The static contact alignment opening 304 is used to make way so that the moving contact 211 can contact the static contact 220.

[0062] The movable contact avoidance opening 303 can make way for the movable contact 210 to move, so that the movable contact 210 can move in the second direction toward the direction close to the stationary contact 220 or away from the stationary contact 220. The movable contact 210 moves toward the direction close to the stationary contact 220, so that the movable contact 211 contacts the stationary contact 220. The movable contact 210 moves toward the direction away from the stationary contact 220, so that the movable contact 211 separates from the stationary contact 220.

[0063] In the above manner, in the present invention, when the circuit breaker 10 is switched from closing to opening, the arc generated between the moving contact 211 and the static contact 220 burns the gas in the semi-enclosed space 301 to expand the gas in the semi-enclosed space 301, thereby forming a positive pressure relative to the gas outlet 302 in the semi-enclosed space 301. The air baffle 311 can block the gas in the semi-enclosed space 301, so as to have at least the following two beneficial effects. First, it prevents or reduces the arc in the semi-enclosed space 301 from spraying toward the part of the moving contact 210 located outside the air baffle 310 and the area where the driving mechanism 400 is located. In this way, it can avoid or reduce the burning of the part of the moving contact 210 located outside the air baffle 310 and the driving mechanism 400 by the arc. Second, it enables a higher positive pressure to be formed in the semi-enclosed space 301, so as to drive the arc to spray out from the gas outlet 302 more timely, and then extinguish the arc in time through the arc extinguishing grid group 320. In this way, it is possible to avoid or reduce the burning of the moving contact 211 , the stationary contact 220 , and the portion of the moving contact 210 located in the semi-enclosed space 301 by the arc.

[0064] It should be noted that, in order to ensure sufficient mechanical strength and sufficient area for installing the moving contact, the existing moving contact (not shown) is generally in the shape of a rod with a thick cross section, so the housing adapted to the existing moving contact needs to be an open housing to facilitate the existing moving contact to extend therein. The air shield 310 in the present invention can be configured to adapt to the moving contact 210 of the present invention, and a more specific description will be given later when the moving contact 210 of the present invention is described.

[0065] Optionally, the gas shield 310 is made of a gas-generating material that can generate gas under arc burning. Thus, by arc burning the gas shield 310 , a large amount of gas can be generated in the semi-enclosed space 301 , so that a higher positive pressure is formed in the semi-enclosed space 301 .

[0066] Optionally, see 4- Figure 8 As shown, the air shield 310 also includes a first plate 312 and a second plate 313. The first plate 312 and the second plate 313 are arranged in a third direction. The semi-enclosed space 301, the moving contact avoidance opening 303, the air shield 311, the static contact alignment opening 304 and the air outlet 302 are arranged between the first plate 312 and the second plate 313.

[0067] Optionally, combined Figure 6-Figure 8 , see 10- Fig.12 As shown, the arc extinguishing grid group 320 includes a plurality of arc extinguishing grids 321 arranged at intervals, and the second side of the first plate 312 and the second side of the second plate 313 are provided with arm plug-in grooves 314 corresponding to the arc extinguishing grids 321. The arc extinguishing grids 321 are provided with grid plug-in arms 322 corresponding to the arm plug-in grooves 314. The grid plug-in arms 322 are inserted into the arm plug-in grooves 314. In this way, the arc extinguishing grids 321 can be easily assembled on the air shield 310.

[0068] Alternatively, if Figure 6-Figure 8 As shown, the static contact alignment opening 304 is connected to the air outlet 302 at the periphery of the semi-enclosed space 301 and is spaced apart from the moving contact avoidance opening 303. In this way, the structure of the air shield 310 can be simplified and the production cost can be reduced.

[0069] Alternatively, if Figure 6-Figure 8 As shown, in one example, the air shield 310 includes a first connecting rod 317 and a second connecting rod 318, and the first connecting rod 317 and the second connecting rod 318 are respectively connected to the first plate 312 and the second plate 313. By way of example and not limitation, the first connecting rod 317 is located on a side of the air shield 311 close to the static contact alignment opening 304, and the second connecting rod 318 is located on a side of the air outlet 302 away from the static contact alignment opening 304. In this way, the first connecting rod 317 and the second connecting rod 318 can enhance the overall mechanical strength of the air shield 310.

[0070] Optionally, in another example, the air shield 310 may not include the first connecting rod 317 and the second connecting rod 318. At this time, the first plate body 312 and the second plate body 313 are connected by the arc extinguishing grid 321.

[0071] Optionally, combined Figure 1-Figure 3 , see 4- Figure 8 As shown, the air baffle 311 and the moving contact avoidance opening 303 are staggered in the third direction.

[0072] Combination Figure 4-Figure 5 , see Figure 6-Figure 8 As shown, the air baffle 311 is connected to the first plate body 312 and extends toward the side where the second plate body 313 is located. The moving contact avoidance opening 303 is formed between the air baffle 311 and the second plate body 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 the first area S1 in the semi-enclosed space 301. The first area S1 is the area exposed by the moving contact avoidance opening 303. The welding portion 215 is connected to the swing arm 216 and extends to the second area S2 in the semi-enclosed space 301, and the second area S2 is the area covered by the air baffle 311. The moving contact 211 is arranged on the welding portion 215 to be located in the second area S2 in the semi-enclosed space 301. It should be noted that the welding portion 215 is a portion used for welding with the moving contact 211.

[0073] In the above manner, an arc can be generated between the moving contact 211 and the stationary contact 220 in a second area S2 covered by the air baffle 311 , so that the arc can be biased to avoid the first area S1 exposed by the moving contact avoidance opening 303 , thereby preventing or reducing the arc from being ejected from the moving contact avoidance opening 303 .

[0074] Optionally, combined Figure 6-Figure 7 , see Figure 8 As shown, the moving contact avoidance opening 303 extends in the second direction into a long strip shape, so that the moving contact 210 can move along the length direction of the moving contact avoidance opening 303. The width of the air baffle 311 in the third direction is the second width W2. The width of the moving contact avoidance opening 303 in the third direction is the first width W1. The second width W2 is greater than the first width W1. In this way, the air baffle 311 can more comprehensively cover the area where the moving contact 210 is located in the semi-enclosed space 301, thereby preventing or avoiding the arc from being ejected from the moving contact avoidance opening 303.

[0075] Preferably, combined Figure 4-Figure 5 , see Figure 10-12 As shown, the swing arm 216 and the welding portion 215 are an integrally formed sheet-shaped bending structure. The swing arm 216 includes a connecting portion 212 located in the semi-enclosed space 301, a first bending portion 213 located in the moving contact avoidance port 303, and a linkage portion 214 located outside the air shield 310. The linkage portion 214 is connected to the connecting portion 212 through the first bending portion 213. The driving mechanism 400 cooperates with the linkage portion 214 to make the swing arm 216 swing under the drive of the driving mechanism 400. The moving contact 211 is connected to the welding portion 215.

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

[0077] In the above manner, the swing arm 216 and the welding part 215 are an integrally formed sheet-shaped bending structure, and the configuration of the first bending part 213 and the first oblique chamfer 305 has at least the following three beneficial effects. On the one hand, the first bending part 213 and the air baffle 311 can be spaced apart, that is, the first bending part 213 makes way for the air baffle 311. Therefore, there is enough gap between the first bending part 213 and the first oblique chamfer 305, so that the blocking caused by the first bending part 213 and the air baffle 311 can be avoided or reduced, and the inability to close the switch can be avoided. On the second hand, the production cost of the swing arm 216 and the welding part 215 can be reduced, and the overall weight of the swing arm 216 and the welding part 215 can be reduced, and the small size design of the first width W1 is convenient. On the third hand, the setting of the first bending part 213 is conducive to the linkage part 214 having a sufficient width along the third direction, so that the linkage part 214 can cooperate stably with the driving mechanism.

[0078] Optionally, combined Figure 4-Figure 5 , see Figure 10-12 As shown, the welding portion 215 is disposed on the connecting portion 212 and is 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 a roughly L-shaped manner. The moving contact 211 is welded to the welding portion 215. It should be noted that the welding portion 215 is a portion used for welding with the moving contact 211. In this way, there is enough area on the welding portion 215 to weld the moving contact 211.

[0079] Optionally, combined Figure 4-Figure 5 , see Figure 10-12 As shown, the gas outlet 302 exposes the first area S1 and the second area S2 in the semi-enclosed space 301. By way of example and not limitation, the gas outlet 302 is open to expose the first area S1 and the second area S2 in the semi-enclosed space 301. In this way, the resistance of the gas outlet 302 to the airflow can be reduced, which is conducive to the positive air pressure in the semi-enclosed space 301 pushing the arc to move to the arc extinguishing grid set 320 through the gas outlet 302, so as to extinguish the arc by using the arc extinguishing grid 321.

[0080] Combination Figure 1-Figure 9 , see Fig.13As shown, it is defined that when the moving contact 211 contacts the static contact 220, the position of the moving contact 211 is the first position, and when the moving contact 211 is separated from the static contact 220, the position of the moving contact 211 is the second position. The second plate 313 is provided with an insertion port 315 exposing the semi-enclosed space 301, and the insertion port 315 is connected to the edge of the second plate 313. A plug-in protrusion 130 is protruded from the inner side of the base 110, and the plug-in protrusion 130 is inserted into the insertion port 315. Optionally, the insertion port 315 is connected to the edge of the second plate 313 close to the moving contact avoidance port 303, but is not limited thereto.

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

[0082] Through the above method, when the moving contact 211 is located at the second position, the insertion port 315 of the arc extinguishing assembly 300 is aligned with the plug-in protrusion 130, and the arc extinguishing assembly 300 is pressed toward the base 110, and the plug-in protrusion 130 can be inserted into the insertion port 315, so that the arc extinguishing assembly 300 can be easily assembled on the base 110.

[0083] Embodiment 2

[0084] Embodiment 2 is further defined based on Embodiment 1. The same parts of Embodiment 2 as those of Embodiment 1 are not described in detail. Embodiment 2 is different from Embodiment 1 in that: The moving contact 210 can swing so that the moving contact 211 contacts or separates from the stationary contact 220. It is defined that when the moving contact 211 contacts the stationary contact 220, the position of the moving contact 211 is the first position, and when the moving contact 211 separates from the stationary contact 220, the position of the moving contact 211 is the second position.

[0085] Optionally, combined Figure 6-Figure 9 , see Figure 3 As shown, one end of the air baffle plate 311 facing the fourth side of the air baffle cover 310 is provided with a moving contact avoidance opening 306 exposing the semi-enclosed space 301 and communicating with the moving contact avoidance opening 303. The moving contact avoidance opening 306 can be provided corresponding to the insertion opening 315.

[0086] The moving contact avoidance opening 306 is used to avoid the end of the moving contact 210 provided with the moving contact 211. When the moving contact 211 is located at the second position, a portion of the end of the moving contact 210 provided with the moving contact 211 is accommodated in the moving contact avoidance opening 306. For example, when the moving contact 211 is located at the second position, a portion of the welding portion 215 and a portion of the moving contact 211 are accommodated in the moving contact avoidance opening 306. In this way, at least the following two beneficial effects are achieved. First, the moving contact avoidance opening 306 avoids the end of the moving contact 210 provided with the moving contact 211, which can avoid wear caused by the welding portion 215 or the moving contact 211 colliding with the air baffle 311. Secondly, when the moving contact 211 is located at the second position, the moving contact avoidance opening 306 accommodates a portion of one end of the moving contact 210 provided with the moving contact 211 , which can reduce the space occupied by the air shield 310 and realize the miniaturization of the air shield 310 .

[0087] Alternatively, if Figure 8 As shown, the two ends of the connection between the moving contact avoidance opening 306 and the moving contact avoidance opening 303 are provided with second chamfers 3061 , which can be more conducive to the moving contact avoidance opening 306 avoiding the end of the moving contact 210 provided with the moving contact 211 .

[0088] Optionally, combined Figure 1-Figure 5 , Figure 7-Figure 8 , see Figure 10-12 As shown, the linkage portion 214 includes a first arm portion 2141, a second arm portion 2142 and a connecting arm portion 2143. One end of the first arm portion 2141 close to the air shield 310 is connected to the second arm portion 2142 through the connecting arm portion 2143. The first arm portion 2141 and the second arm portion 2142 are bent relative to the connecting arm portion 2143 so that the first arm portion 2141 and the second arm portion 2142 are arranged in parallel and relatively spaced along the third direction. One end of the first arm portion 2141 close to the air shield 310 is connected to one end of the first bent portion 213 away from the connecting portion 212, and the first arm portion 2141 and the connecting portion 212 are arranged in parallel. Among them, the driving device cooperates with one end of both the first arm portion 2141 and the second arm portion 2142 away from the air shield 310 to drive the moving contact 210 to swing.

[0089] The above method has at least the following two beneficial effects. First, the end of the first arm portion 2141 close to the air shield 310 is connected to the end of the first bent portion 213 away from the connecting portion 212, and the first arm portion 2141 is arranged in parallel with the connecting portion 212, so that the first arm portion 2141 and the second arm portion 2142 are separated by a sufficient width along the third direction, so that the linkage portion 214 and the driving mechanism can cooperate stably. Second, the production cost of the swing arm 216 can be reduced and the overall weight of the swing arm 216 can be reduced, and the small size design of the first width W1 is convenient.

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

[0091] Alternatively, if Figure 6-Figure 9 As shown, the first plate body 312 has a first edge 308. The first edge 308 is located on a side of the air baffle plate 311 away from the second plate body 313. The first edge 308 has a first slope edge 3081 and a first top edge 3082 in sequence along a direction toward the fourth side of the air baffle cover 310. The first top edge 3082 is located on a side of the first slope edge 3081 close to the air outlet 302.

[0092] like Figure 6-Figure 9 As shown, the second plate 313 has a second edge 309. The second edge 309 is located at one side of the moving contact avoidance opening 303. The second edge 309 has a second slope edge 3091 and a first notch edge 3092 in sequence along the direction toward the fourth side of the air shield 310. The first notch edge 3092 encloses the moving contact avoidance opening 306.

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

[0094] In the above manner, the configuration of the first sloped edge 3081, the second sloped edge 3091 and the inclined plate portion 3111 can make it possible for the air shield 310 to avoid the connecting arm portion 2143, the moving contact 211 and the welding portion 215 when the moving contact 210 swings and the moving contact 211 switches between the first position and the second position. In addition, the portion of the moving contact 210 located outside the air shield 310 can be arranged more compactly with the air shield 310, thereby facilitating miniaturization of the circuit breaker 10.

[0095] Embodiment 3

[0096] Embodiment 3 is further limited based on Embodiment 1 or Embodiment 2, and the same parts of Embodiment 3 as those of Embodiment 1 or Embodiment 2 are not repeated here, and the difference between Embodiment 3 and Embodiment 1 or Embodiment 2 is that.

[0097] Combination Figure 1-Figure 9 , see Fig.13As shown, the air shield 310 further includes a flange portion 316, which is protrudingly arranged on the third side of the air shield 310 and / or the fourth side of the air shield 310. The inner side of the base 110 is provided with a blocking groove 112 corresponding to the flange portion 316, and the inner side of the base 110 is provided with a grid piece plugging groove 111 corresponding to the arc extinguishing grid piece 321. The flange portion 316 is plugged into the blocking groove 112, and the arc extinguishing grid piece 321 is plugged into the grid piece plugging groove 111.

[0098] The flange portion 316 can slide along the blocking groove 112 in a direction away from the base 110, and the arc extinguishing grid 321 can slide along the grid plug-in groove 111 in a direction away from the base 110, and the insertion port 315 can slide along the plug-in protrusion 130 in a direction away from the base 110, so as to remove the arc extinguishing assembly 300 from the base 110. In this way, the arc extinguishing assembly 300 can be conveniently disassembled.

[0099] In the above manner, the flange 316 is aligned with the blocking groove 112, the arc extinguishing grid 321 is aligned with the grid plug-in groove 111, and the insertion opening 315 is aligned with the plug-in protrusion 130, and the arc extinguishing assembly 300 is pressed toward the inner side of the base 110, the flange 316 can be inserted into the blocking groove 112, the arc extinguishing grid 321 can be inserted into the grid plug-in groove 111, and the plug-in protrusion 130 can be inserted into the insertion opening 315. In this way, the arc extinguishing assembly 300 can be conveniently installed.

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

[0101] The above method has at least the following two beneficial effects: first, the gas in the air guide channel 101 is restricted to flow out of the circuit breaker housing 100 from the second end of the air guide channel 101, which is beneficial to reducing the temperature inside the circuit breaker housing 100. Second, it can reduce or avoid the arc generated between the moving contact 211 and the static contact 220 from burning the part of the moving contact 210 located outside the air shield 310 and the driving mechanism.

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

[0103] Embodiment 4

[0104] Embodiment 4 is obtained by further limiting any one of Embodiments 1 to 3. The same parts of Embodiment 4 as those of Embodiments 1 to 3 are not repeated here. The differences between Embodiment 4 and Embodiments 1 to 3 are as follows.

[0105] contrast Figure 6-Figure 9 , see Fig.15 As shown, the inner wall of the air shield 310 facing the semi-enclosed space 301 is provided with a concavo-convex structure 307. By way of example and not limitation, the inner wall of the first plate 312 and / or the inner wall of the second plate 313 is provided with a concavo-convex structure 307, but is not limited thereto. In some examples, the inner wall of the air shield 311 is provided with a concavo-convex structure 307. By using the concavo-convex structure 307, when the arc burns the first plate 312 and / or the second plate 313, the contact area between the arc and the first plate 312 and / or the second plate 313 can be increased, thereby increasing the gas production, so that a higher positive pressure is formed in the semi-enclosed space 301, thereby pushing the arc to eject from the gas outlet 302. The concavo-convex structure 307 may include grooves 3071 and bumps 3072 arranged alternately.

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

Claims

1. An arc extinguishing assembly, characterized in that: The arc extinguishing assembly includes an air baffle and an arc extinguishing grid group; the air baffle encloses a semi-enclosed space, and the semi-enclosed space has an air outlet and a static contact alignment port; the static contact alignment port is used to make way so that the moving contact can contact the static contact; the side of the air baffle facing 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 avoidance port; the arc extinguishing grid group is provided on the second side of the air baffle and located on the air outlet path of the air outlet.

2. The arc extinguishing assembly according to claim 1, characterized in that: The side of the air baffle cover where the static contact alignment port is provided is the third side of the air baffle cover, and the side of the air baffle cover away from the static contact alignment port is the fourth side of the air baffle cover; the spacing direction between the first side and the second side of the air baffle cover is the first direction, and the spacing direction between the third side and the fourth side of the air baffle cover is the second direction; the air baffle cover has a third direction perpendicular to the second direction and the first direction; wherein the air baffle plate and the moving contact avoidance port are staggered in the third direction.

3. The arc extinguishing assembly according to claim 2, characterized in that: The air baffle cover further comprises a first plate body and a second plate body; the first plate body and the second plate body are arranged at intervals along the third direction; the semi-enclosed space, the moving contact avoidance opening, the air baffle plate, the static contact alignment opening and the air outlet are arranged between the first plate body and the second plate body; Wherein, the air baffle is connected to the first plate body and extends toward the side where the second plate body is located; the moving contact avoidance opening is formed between the air baffle plate and the second plate body.

4. The arc extinguishing assembly according to claim 2, characterized in that: The moving contact avoidance opening extends in the second direction into a long strip; the width of the air baffle in the third direction is the second width; the width of the moving contact avoidance opening in the third direction is the first width; the second width is greater than the first width.

5. The arc extinguishing assembly according to any one of claims 1 to 4, characterized in that: The side wall of the moving contact avoidance opening close to the second plate body has a first chamfer.

6. The arc extinguishing assembly according to claim 1, characterized in that: The side of the air shield provided with the static contact alignment opening is the third side of the air shield, and the side of the air shield away from the static contact alignment opening is the fourth side of the air shield; the spacing direction between the first side and the second side of the air shield is the first direction, and the spacing direction between the third side and the fourth side of the air shield is the second direction; the air shield has a third direction perpendicular to the second direction and the first direction; The air baffle cover further comprises a first plate body and a second plate body; the first plate body and the second plate body are arranged at intervals along the third direction; the semi-enclosed space, the moving contact avoidance opening, the air baffle plate, the static contact alignment opening and the air outlet are arranged between the first plate body and the second plate body; The second plate body is provided with an insertion opening exposing the semi-enclosed space, the insertion opening is connected to the edge of the second plate body, and the insertion opening is used to avoid the moving contact so that the moving contact can pass through the second plate body.

7. The arc extinguishing assembly according to claim 6, characterized in that: One end of the air baffle plate facing the fourth side of the air baffle cover is provided with a moving contact avoidance opening exposing the semi-enclosed space and communicating with the moving contact avoidance opening.

8. The arc extinguishing assembly according to claim 7, characterized in that: The first plate body has a first edge; the first edge is located at a side of the air baffle plate away from the second plate body; the first edge has a first slope edge and a first top edge in sequence along the direction toward the fourth side of the air baffle cover; the first top edge is located at a side of the first slope edge close to the air outlet; The second plate body has a second edge; the second edge is located at one side of the moving contact avoidance opening; the second edge has a second slope edge and a first notch edge in sequence along the direction toward the fourth side of the air shield; the first notch edge encloses the moving contact avoidance opening; Wherein, the air baffle plate includes an inclined plate portion and a top plate portion; the inclined plate portion extends along the first sloped edge, and the top plate portion extends along the top edge; the moving contact avoidance 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 shield provided with the static contact alignment opening is the third side of the air shield, and the side of the air shield away from the static contact alignment opening is the fourth side of the air shield; the spacing direction between the first side and the second side of the air shield is the first direction, and the spacing direction between the third side and the fourth side of the air shield is the second direction; the air shield has a third direction perpendicular to the second direction and the first direction; The air baffle cover further comprises a first plate body and a second plate body; the first plate body and the second plate body are arranged at intervals along the third direction; the semi-enclosed space, the moving contact avoidance opening, the air baffle plate, the static contact alignment opening and the air outlet are arranged between the first plate body and the second plate body; Wherein, the arc-extinguishing grid group includes a plurality of arc-extinguishing grids arranged at intervals, and the second side of the first plate body and the second side of the second plate body are provided with arm plug-in grooves corresponding to the arc-extinguishing grids; the arc-extinguishing grids are provided with grid plug-in arms corresponding to the arm plug-in grooves; and the grid plug-in arms are inserted into the arm plug-in grooves.

10. The arc extinguishing assembly according to claim 1, characterized in that: The inner wall of the air shield facing the semi-enclosed space is provided with a concave-convex structure; the concave-convex structure includes grooves and convex blocks arranged alternately.

11. The arc extinguishing assembly according to claim 1, characterized in that: The air deflector cover further includes a flange portion, and the flange portion is arranged on a third side of the air deflector cover and / or a fourth side of the air deflector cover.

12. A circuit breaker, characterized in that: The circuit breaker comprises a base, an arc extinguishing assembly, a moving contact and a stationary contact, wherein the stationary contact comprises a stationary contact point; the arc extinguishing assembly is the arc extinguishing assembly according to any one of claims 1 to 13 above; In which, the arc extinguishing assembly is arranged on the base, the end of the moving contact away from the static contact is retained outside the air shield, and the end of the moving contact close to the static contact extends into the semi-enclosed space through the moving contact avoidance opening and is provided with a moving contact; the static contact is arranged on the base, and the static contact alignment opening is used to make way so that the moving contact can contact the static contact.

13. The circuit breaker according to claim 12, characterized in that: The moving contact includes a swing arm and a welding portion; the swing arm extends into the semi-enclosed space and is accommodated in a first area within the semi-enclosed space; the first area is an area exposed by the moving contact avoidance; the welding portion is connected to the swing arm and extends to a second area within the semi-enclosed space, and the second area is an area covered by the air baffle; the moving contact is arranged at the welding portion to be located in the second area within the semi-enclosed space.

14. The circuit breaker according to claim 13, characterized in that The welding portion is disposed on the swing arm and is bent toward a side of the swing arm facing the second area.

15. The circuit breaker according to claim 14, characterized in that The swing arm and the welding part are an integrally formed sheet-like bending structure; the swing arm includes a connecting part located in the semi-enclosed space, a first bending part located at the moving contact avoidance port, and a linkage part located outside the air baffle cover; the linkage part is connected to the connecting part through the first bending part; the first bending part is bent toward the side where the second plate is located relative to the connecting part; the linkage part is used to cooperate with the driving mechanism.

16. The circuit breaker according to claim 15, characterized in that The linkage part includes a first arm, a second arm and a connecting arm; one end of the first arm close to the air deflector is connected to the second arm through 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 in parallel and relatively spaced along a third direction; one end of the first arm close to the air deflector is connected to an end of the first bending part away from the connecting part, and the first arm is arranged in parallel with the connecting part.

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