Static contact assembly and circuit breaker

Abstract

The static contact assembly comprises a static contact plate and a static arc striking angle, two ends of the static contact plate are respectively provided with a contact part and a wiring part, the contact part is provided with a static contact, and the static contact plate connected between the contact part and the wiring part is provided with a through hole serving as a matching area. The static arc striking angle is arranged on the side, back to the static contact, of the static arc striking angle in the direction parallel to the surface of the static contact plate, a static arc striking part is arranged at one end of the static arc striking angle, the static arc striking part penetrates through the matching area and then is connected to the contact part, and the other end of the static arc striking angle extends in the direction away from the contact part. According to the utility model, the static contact plate connected between the contact part and the wiring part is provided with the through hole serving as the matching area, the matching area of the static contact plate can reduce the material consumption of the static contact plate, the static contact plate can be communicated with an arc extinguish chamber when the static contact plate is applied to a circuit breaker, and the static contact plate and a static arc striking angle are assembled in an approximately parallel manner, so that the occupied space is small.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical appliances, specifically to a stationary contact assembly and a circuit breaker. Background Technology

[0002] A molded case circuit breaker is a low-voltage circuit protection device with overload, short circuit and undervoltage protection functions. When a short circuit fault occurs in the circuit, an electric arc is generated when the moving contact and the stationary contact separate. Under the action of the magnetic field and the air field, the electric arc enters the arc extinguishing chamber along the arc ignition angle and is extinguished.

[0003] The existing stationary contact assembly has the following drawbacks: First, the stationary contact assembly has a U-shaped structure, which occupies a lot of internal space; second, the stationary contact assembly is set along the end face connecting the arc inlet end and the exhaust end of the arc-extinguishing chamber, which is not conducive to the arrangement of the grid plate group in the arc-extinguishing chamber and does not have a magnetic blow-out effect; third, there is a gap between the arc initiation angle and the stationary contact, which generates magnetic resistance and cannot quickly and effectively connect with the arc root at the stationary contact, which is not conducive to the rapid transfer of the arc root; fourth, the stationary contact assembly uses a lot of materials and has a high cost. Summary of the Invention

[0004] The purpose of this invention is to overcome at least one defect of the prior art and to provide a stationary contact assembly and a circuit breaker.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This utility model provides a stationary contact assembly, including a stationary contact plate and a stationary arc angle. The two ends of the stationary contact plate are respectively provided with a contact portion and a wiring portion. The contact portion is provided with a stationary contact point. The stationary contact plate connected between the contact portion and the wiring portion is provided with a through hole as a mating area. The stationary arc angle is arranged on the side opposite to the stationary contact point in a direction parallel to the surface of the stationary contact plate. One end of the stationary arc angle is provided with a stationary arc portion, which passes through the mating area and connects to the contact portion. The other end of the stationary arc angle extends in a direction away from the contact portion.

[0007] Preferably, the edge of the stationary arc portion is connected to the edge of the stationary contact point.

[0008] Preferably, there are at least two contact points between the stationary arc portion and the stationary contact plate. The stationary arc portion is connected to the contact portion near the stationary contact point to form a contact portion. The stationary arc portion away from the stationary contact point has at least another contact point in the area of ​​the stationary contact plate opposite to the stationary contact point after passing through the mating area.

[0009] Preferably, it also includes an arc-inducing plate, one end of which is connected to a stationary contact plate near the wiring part, and the other end of which extends away from the stationary contact plate after passing through the mating area. The middle part of the arc-inducing plate and the stationary arc-inducing part are respectively arranged on opposite sides of the mating area, so that an airflow channel is formed between the middle part of the arc-inducing plate and the stationary arc-inducing part.

[0010] Preferably, the middle part of the static arc-guiding section is bent at least once to form an arc-guiding protrusion, which protrudes towards the arc-guiding plate to narrow the inlet of the airflow channel.

[0011] Preferably, it also includes an arc-blocking cover, which at least covers one side of the plate disposed on the stationary contact plate.

[0012] Preferably, the arc-blocking cover and the stationary contact are located on the same side of the stationary contact plate, and the arc-blocking cover is divided into a first arc-blocking cover and a second arc-blocking cover.

[0013] The first arc-damping cover covers the end of the stationary contact plate furthest from the wiring section.

[0014] The second arc-blocking cover covers the surface of the stationary contact plate located between the wiring part and the contact part. The middle part of the second arc-blocking cover is provided with a groove corresponding to the mating area. The edge of the second arc-blocking cover near the wiring part is provided with a baffle. The edge of the second arc-blocking cover is provided with an arc-inducing structure. At least part of the arc-inducing structure is arranged around the groove, and the arc-inducing structure extends on the side of the stationary contact plate opposite to the contact part.

[0015] Preferably, at least a portion of the arc-initiating structure is formed by extending from the edge of the groove, and the arc-initiating structure includes an extension and / or an arc-initiating leg.

[0016] The extension portion and the stationary arc-drawing portion are spaced apart and opposite each other within the mating area, and the end of the extension portion extends on the side of the stationary contact plate opposite to the contact portion.

[0017] The arc-guiding legs are arranged along the opposite two sides of the groove. Each arc-guiding leg extends on the side of the stationary contact plate opposite to the contact part. The end of each arc-guiding leg is provided with an inclination angle so that the gap between the two arc-guiding legs is maximized at the position away from the stationary contact plate.

[0018] Preferably, the arc-inducing structure further includes a support portion, which is formed by extending from the edge of the second arc-isolating cover, and each support portion forms a receiving space with an adjacent arc-inducing leg, with the stationary contact plates located on both sides of the mating area correspondingly disposed within the receiving space.

[0019] Preferably, it also includes a magnetic yoke, the middle part of which is attached to the side of the contact portion opposite to the stationary contact, and the two ends of the magnetic yoke extending from both sides of the contact portion toward the side where the stationary contact is located.

[0020] Preferably, the stationary contact plate is straight, with a through hole in the middle serving as a mating area, one end of the stationary contact plate folded back and extended to form a contact portion, an assembly gap being left between the contact portion and the surface of the stationary contact plate, and at least a portion of the contact portion corresponding to the mating area, and the other end of the stationary contact plate having a wiring hole serving as a wiring portion.

[0021] Preferably, the static guide arc is a straight plate, one end of the static guide arc is folded back to form a static guide arc portion, and the other end of the static guide arc is bent to form a static sharp corner portion, and the static guide arc and the static sharp corner portion are respectively located on opposite sides of the plate surface of the static guide arc.

[0022] This utility model also provides a circuit breaker, including a housing, at least one pair of terminals are provided inside the housing, a moving contact is provided inside the housing, and a stationary contact assembly as described above is also provided inside the housing. The stationary contact of the contact portion is spaced apart from the moving contact of the moving contact, and the wiring portion is connected to an adjacent terminal.

[0023] Furthermore, the outer casing is also provided with an arc-extinguishing chamber, which includes two interconnected arc-extinguishing cavities that form an angle with each other. The stationary contact plate is disposed through one of the arc-extinguishing cavities, and the stationary arc-drawing angle cooperates with the other arc-extinguishing cavity. The cooperation area corresponds to the connection point of the two arc-extinguishing cavities.

[0024] Furthermore, each arc-extinguishing chamber is provided with at least one grid plate group, and an arc-inducing plate is provided between the grid plate groups of two arc-extinguishing chambers. The arc-inducing plate passes through the mating area and forms an airflow channel with the stationary arc-inducing part at intervals within the mating area.

[0025] The present invention relates to a stationary contact assembly and a circuit breaker. The stationary contact plate connected between the contact part and the wiring part has a through hole as a mating area. The mating area of ​​the stationary contact plate can reduce the material used in the stationary contact plate. When applied in a circuit breaker, it can connect to the arc extinguishing chamber. The assembly method in which the stationary contact plate and the stationary arc ignition angle are approximately parallel occupies little space.

[0026] In addition, the static arc of the static arc is connected to the static contact, eliminating the gap between the static arc and the static contact, which facilitates the rapid transfer of the arc root of the static contact.

[0027] In addition, there are at least two contact points between the stationary arc-starting section and the stationary contact plate, making the two contact points equipotential, which is beneficial for arc starting.

[0028] In addition, the arc-drawing protrusion of the static arc-drawing section can narrow the inlet of the exhaust channel, thereby forming a structure with a narrow inlet and a large outlet, which is conducive to forming a pressure difference and accelerating the exhaust of airflow.

[0029] In addition, the arc-starting plate configured in the stationary contact assembly can connect the grid plates of the two arc-extinguishing chambers together, thereby connecting the electric arcs in the two arc-extinguishing chambers in series, thus lengthening the electric arc and increasing the size of the grid plate assembly that cuts the electric arc.

[0030] In addition, the stationary contact assembly is equipped with an arc-blocking cover to prevent the stationary contact assembly from being corroded by electric arc. In particular, the arc-blocking cover is also equipped with an arc-initiating structure to facilitate arc initiation. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the static contact assembly and the arc-extinguishing chamber in this utility model;

[0032] Figure 2 This is a front view of the stationary contact assembly and the arc-extinguishing chamber in this utility model;

[0033] Figure 3 This is a schematic diagram of the moving contact assembly and the stationary contact assembly in this utility model;

[0034] Figure 4 This is a schematic diagram of the static contact assembly in this utility model;

[0035] Figure 5 This is a cross-sectional view of the stationary contact assembly in this utility model;

[0036] Figure 6 This is a top view of the stationary contact assembly in this utility model;

[0037] Figure 7 This is a schematic diagram of the static contact plate in this utility model;

[0038] Figure 8 This is a schematic diagram of the static arc angle in this utility model;

[0039] Figure 9 This is a schematic diagram of the arc-guiding plate in this utility model;

[0040] Figure 10 This is a schematic diagram of the structure of the second arc-isolating cover in this utility model;

[0041] Figure 11 This is a schematic diagram of the structure of a stationary contact assembly in the prior art;

[0042] Figure 12 This is a schematic diagram of the structure of a static contact plate in the prior art;

[0043] Figure 13 This is a schematic diagram of the connection between the stationary contact assembly and the arc-extinguishing chamber in the prior art;

[0044] Figure label:

[0045] 32-Moving contact assembly, 321-Rotating shaft, 322-Moving contact, 323-Stationary contact assembly, 3230-Stationary contact plate, 32301-Assembly gap, 3231-Contact part, 32311-Connecting section, 3232-Wiring part, 3233-Stationary contact point, 3238-Mating area, 3239-Airflow channel, 32391-Inlet, 32392-Outlet, 3241-First arc-blocking cover, 3242-Second arc-blocking cover, 324 20-Main body, 32421-Extension, 32422-Baffle, 32423-Arc-starting support leg, 32424-Support, 32425-Groove, 33-Arc-extinguishing chamber, 334-Static arc-starting angle, 3341-Static arc-starting part, 33410-Arc-starting protrusion, 33411-First section, 33412-Second section, 33413-Third section, 3342-Static sharp corner, 335-Arc-starting plate, 339-Magnetic yoke, 34-Connecting plate. Detailed Implementation

[0046] The specific embodiments of the stationary contact assembly of this utility model are further described below with reference to the accompanying drawings. The stationary contact assembly of this utility model is not limited to the descriptions in the following embodiments.

[0047] A circuit breaker includes a housing, within which an operating mechanism and at least one conductive unit are disposed. The housing has an operating hole. The operating mechanism is rotatably mounted and connected to an operating element, which extends from the operating hole to the outside of the housing for manually driving the operating mechanism. Each conductive unit includes a pair of spaced-apart terminals. Between the pair of terminals is a contact system and an arc-extinguishing chamber 33. Typically, the contact system includes a moving contact assembly 32 and a stationary contact assembly 323 that cooperate with each other. The operating mechanism is drivenly connected to the moving contact assembly 32. The moving contact assembly 32 includes a rotatably mounted shaft 321 and a moving contact 322 connected to the shaft 321. The contact system corresponds to the arc inlet of the arc-extinguishing chamber 33. The arc generated by the breaking of the contact system is introduced into the arc-extinguishing cavity of the arc-extinguishing chamber 33 by the arc-extinguishing chamber 33 for extinguishing.

[0048] For ease of description, the direction of the connection between a pair of terminals is taken as the first direction, and the two directions perpendicular to the first direction are taken as the second and third directions. The moving contact 322 and the stationary contact assembly 323 are spaced apart and opposite each other in the second direction, and contact or separate at the arc inlet of the arc-extinguishing chamber 33. Figure 2 For example, the first direction is left and right, the second direction is up and down, and the third direction is perpendicular to the paper.

[0049] like Figure 11-13As shown, the stationary contact assembly 323 typically includes a stationary contact plate 3230 and a stationary arc angle 334. The stationary contact plate 3230 has an overall U-shaped structure. Contact portions 3231 and wiring portions 3232 are respectively provided at both ends of the stationary contact plate 3230. The contact portions 3231 and wiring portions 3232 form angles with the connected areas of the stationary contact plate 3230. The contact portion 3231 has a stationary contact point 3233. The wiring portion 3232 is connected to a terminal block. The wiring portion 3232 and the contact portion 3231 are spaced apart and opposite each other in a first direction. One end of the stationary arc angle 334 is adjacent to the contact portion 3231. 231 connection, the other end of the stationary arc-leading angle 334 extends in the recess between the contact part 3231 and the wiring part 3232. At this time, it can be considered that the stationary arc-leading angle 334 is set in the stationary contact plate 3230 in the second direction. When the arc-extinguishing chamber 33 cooperates with the stationary contact assembly 323, that is, the arc-extinguishing chamber 33 and the stationary contact assembly 323 are set in the second direction, the stationary contact 3233 is located on the arc inlet side of the arc-extinguishing chamber 33, one end of the arc-extinguishing chamber 33 is set in the recess of the stationary contact plate 3230, and the stationary arc-leading angle 334 extends from the arc inlet to the arc-extinguishing cavity of the arc-extinguishing chamber 33.

[0050] The improvement of this application is that the stationary contact plate 3230 connected between the contact portion 3231 and the wiring portion 3232 is provided with a through hole as a mating area 3238, the stationary arc angle 334 is provided on the side opposite to the stationary contact 3233 in a direction parallel to the surface of the stationary contact plate 3230, one end of the stationary arc angle 334 is provided with a stationary arc portion 3341, the stationary arc portion 3341 passes through the mating area 3238 and is connected to the contact portion 3231, and the other end of the stationary arc angle 334 extends in a direction away from the contact portion 3231.

[0051] With this structure, the mating area 3238 of the stationary contact plate 3230 can reduce the material used for the stationary contact plate 3230. When applied to a circuit breaker, it can connect to the arc-extinguishing chamber 33. The assembly method of the stationary contact plate 3230 and the stationary arc-leading angle 334 being approximately parallel occupies little space.

[0052] Preferably, the edges of the stationary arc portion 3341 and the stationary contact 3233 are connected, thereby eliminating the gap between the stationary arc angle 334 and the stationary contact 3233, which facilitates the rapid transfer of the arc root of the stationary contact 3233.

[0053] Furthermore, there are at least two contact points between the stationary arc-inducing part 3341 and the stationary contact plate 3230. One of the contact points is located at the junction of the stationary arc-inducing part 3341 and the stationary contact 3233. The stationary arc-inducing part 3341, which is away from the stationary contact 3233, has at least another contact point in the area of ​​the stationary contact plate 3230 opposite to the stationary connection part 3232 after passing through the mating area 3238. The two contact points form an equipotential, making it convenient for the stationary arc-inducing part 3341 connected between the two contact points to induce an arc.

[0054] Furthermore, the stationary contact assembly 323 is also equipped with an arc-inducing plate 335. One end of the arc-inducing plate 335 is connected to the stationary contact plate 3230 near the wiring portion 3232, and the other end of the arc-inducing plate 335 extends away from the stationary contact plate 3230 after passing through the mating area 3238. When the stationary contact assembly 323 is installed in the circuit breaker, the arc-inducing plate 335 can be used for arc induction. The middle part of the arc-inducing plate 335 and the stationary arc-inducing portion 3341 are spaced apart and opposite each other in the mating area 3238. The gap between the arc-inducing plate 335 and the stationary arc-inducing portion 3341 serves as an airflow channel 3239. Preferably, the middle part of the stationary arc-inducing portion 3341 is bent at least once to form an arc-inducing protrusion 33410. The arc-inducing protrusion 33410 protrudes towards the arc-inducing plate 335 to narrow the airflow channel 3239 for arc induction, which is beneficial to form a pressurized space and accelerate the discharge of airflow.

[0055] Furthermore, the stationary contact assembly 323 is also equipped with an arc-blocking cover and a magnetic yoke 339. The arc-blocking cover covers at least one side of the stationary contact plate 3230 to prevent the electric arc from eroding the stationary contact plate 3230. The magnetic yoke 339 is disposed on the side of the contact portion 3231 opposite to the stationary contact 3233. In the energized state, the magnetic yoke 339 and the contact portion 3231 cooperate to generate a magnetic field. The electric arc is driven by the Lorentz force in the magnetic field, which facilitates its rapid entry into the arc-extinguishing chamber 33.

[0056] Combination Figure 1-10 A specific embodiment of a stationary contact assembly 323 is provided.

[0057] like Figure 1-7 As shown, the stationary contact assembly 323 includes a stationary contact plate 3230 and a stationary arc angle 334. The stationary contact plate 3230 has a straight plate structure. A through hole is provided in the middle of the stationary contact plate 3230 as a mating area 3238. One end of the stationary contact plate 3230 is folded back and extended to form a contact portion 3231. The other end of the stationary contact plate 3230 serves as a wiring portion 3232 and is provided with a wiring hole. Figure 7 In this embodiment, the width of the connecting section 32311 between the contact portion 3231 and the stationary contact plate 3230 is smaller than the width of the stationary contact plate 3230, but larger than the width of the contact portion 3231. The contact portion 3231 has a stationary contact point 3233 on the side opposite to the stationary contact plate 3230. The contact portion 3231 extends outward at an angle away from the plate surface of the stationary contact plate 3230, so that there is an assembly gap between the wiring portion 3232 and the stationary contact plate 3230. At least a part of the contact portion 3231 corresponds to the mating area 3238. In this embodiment, the end of the contact portion 3231 corresponds to one end of the mating area 3238 away from the wiring portion 3232.

[0058] like Figure 1-6As shown in Figure 8, the static arc angle 334 is located on a strip-shaped straight plate. One end of the static arc angle 334 is folded back to form the static arc portion 3341, and the other end of the static arc angle 334 is bent to form the static sharp corner portion 3342. The static arc angle 334 and the static sharp corner portion 3342 are located on opposite sides of the plate surface of the static arc angle 334. Figure 3-6 In section 8, the width of the stationary sharp corner portion 3342 is the smallest, and its width is preferably reduced gradually to maximize the magnetic field strength of the stationary sharp corner portion 3342, which is beneficial for arc initiation; furthermore, the middle part of the stationary arc-initiating portion 3341 is bent at least once to form the arc-initiating protrusion 33410. Figure 3-5 In section 8, the middle of the stationary arc section 3341 is bent once, making the entire stationary arc section 3341 hook-shaped. The stationary arc section 3341 includes a first segment 33411, a second segment 33412, and a third segment 33413 connected in sequence. The first segment 33411 is connected to the contact portion 3231 to form a contact point, and the end of the first segment 33411 is connected to the edge of the stationary contact 3233 to avoid gaps between them. The third segment 33413 obliquely passes through the mating area 3238 and connects with the stationary contact plate 3230 to form the second contact point. The second segment 33412 and the third segment 33413 are connected at an angle, and the connection point between the second segment 33412 and the third segment 33413 serves as the arc-initiating protrusion 33410. The arc-initiating protrusion 33410, the first segment 33411, and the second segment 33412 are all located on the same side of the stationary contact plate 3230 as the stationary contact point 3233. It should be noted that the second contact point can be connected to the stationary arc-initiating part 3341 and the stationary contact plate 3230 at other locations.

[0059] like Figure 3-5 As shown in Figure 9, the stationary contact assembly 323 also includes an arc-inducing plate 335, which is disposed on opposite sides of the mating area 3238 at a distance from the stationary arc-inducing portion 3341. Figure 9 In this configuration, the arc-initiating plate 335 is L-shaped. One end of the arc-initiating plate 335 is connected to the area of ​​the stationary contact plate 3230 near the wiring part 3232. The other end of the arc-initiating plate 335 extends away from the stationary contact plate 3230 after passing through the mating area 3238, forming an airflow channel 3239 of a certain length between the arc-initiating plate 335 and the stationary arc-initiating part 3341. The arc-initiating protrusion 33410 corresponds to the opening of the airflow channel 3239, narrowing the inlet 32391 of the airflow channel 3239, making the inner diameter of the inlet 32391 of the airflow channel 3239 smaller than the inner diameter of the outlet 32392 of the airflow channel 3239. Figure 5 In the diagram, D1 represents the inner diameter of the inlet 32391, and D2 represents the inner diameter of the outlet 32392. D2 > D1. At this time, the airflow channel 3239 is funnel-shaped in the second direction, which is conducive to forming a pressure difference and accelerating the gas outflow.

[0060] like Figure 1 , 3 As shown in Figures 6 and 10, the stationary contact assembly 323 also includes an arc-blocking cover. The arc-blocking cover and the stationary contact 3233 are located on the same side of the stationary contact plate 3230. In this embodiment, the arc-blocking cover is divided into a first arc-blocking cover 3241 and a second arc-blocking cover 3242. The first arc-blocking cover 3241 covers one end of the stationary contact plate 3230 away from the wiring portion 3232, that is, the first arc-blocking cover 3241 wraps around the outside of the connecting section 32311. The second arc-blocking cover 3242 has a recess in the middle that corresponds to the mating area 3238. The groove 32425 and the second arc-isolating cover 3242 are provided with a baffle 32422 near the edge of the wiring part 3232. The baffle 32422 can cooperate with the arc-extinguishing chamber 33 in the circuit breaker to prevent the electric arc from affecting the wiring part 3232. The second arc-isolating cover 3242 covers the plate surface of the stationary contact plate 3230 located between the wiring part 3232 and the contact part 3231. The second arc-isolating cover 3242 wraps around most of the area of ​​the stationary contact plate 3230 to prevent the electric arc from eroding the second arc-isolating cover 3242.

[0061] Preferred, such as Figure 10As shown, the edge of the second arc shield 3242 is also provided with an arc-inducing structure. At least part of the arc-inducing structure is arranged around the groove 32425, and the arc-inducing structure extends on the side of the stationary contact plate 3230 opposite to the contact portion 3231, which is conducive to guiding the arc flow. At the same time, the arc-inducing structure can also cooperate to form a structure of narrow inlet 32391 and wide outlet 32392 in the airflow channel 3239. At least part of the arc-inducing structure is formed by extending from the edge of the groove 32425. The arc-inducing structure includes an extension 32421 and / or an arc-inducing support leg 32423. The extension 32421 and the stationary arc-inducing portion 3341 are spaced opposite each other in the mating area 3238. The end of the extension 32421 extends on the side of the stationary contact plate 3230 opposite to the contact portion 3231. The arc-inducing plate 335 can be arranged along the extension 32421. The arc-inducing support leg 32423 extends along the edge of the groove 32425. The groove 32425 is provided on both sides of the opposite edge. The gap between the two arc-leading legs 32423 is the largest at the position away from the stationary contact plate 3230. For example, the end of each arc-leading leg 32423 is provided with an inclination angle so that the opposite side of the two arc-leading legs 32423 is a slope. This achieves the maximum gap between the two arc-leading legs 32423 at the position away from the stationary contact plate 3230. Of course, the end of each arc-leading leg 32423 can also be bent outward. In this way, based on the gap between the arc-leading protrusion 33410 and the arc-leading plate 335 having a narrow inlet 32391 and a wide outlet 32392 in the second direction, combined with the gap of the two arc-leading legs 32423 in the third direction, the airflow channel 3239 is further made to form a trumpet-shaped structure with a narrow inlet 32391 and a wide outlet 32392. Of course, the extension 32421 and the arc-starting leg 32423 can be provided at different times, that is, only the extension 32421 can be provided, or only the arc-starting leg 32423 can be provided.

[0062] Furthermore, the arc-inducing structure also includes a support portion 32424, which is formed by extending from the edge of the second arc-isolating cover 3242. Each support portion 32424 and an adjacent arc-inducing leg 32423 form a receiving space. The stationary contact plates 3230 located on both sides of the mating area 3238 are correspondingly arranged in the receiving space, so that the second arc-isolating cover 3242 can be mounted on the stationary contact plate 3230.

[0063] In this embodiment, if Figure 10As shown, the second arc-blocking cover 3242 includes a plate-shaped body 32420. The middle part of the body 32420 is provided with a groove 32425 corresponding to the mating area 3238, so that the body 32420 is U-shaped. The body 32420 on both sides of the groove 32425 is attached to the stationary contact plate 3230 as mounting arms. In the figure, the inner edge of each mounting arm is provided with an arc-inducing leg 32423, and the outer edge of each mounting arm is provided with a support portion 32424. The length of the arc-inducing leg 32423 is greater than the length of the support portion 32424, forming an accommodating space between the arc-inducing leg 32423 and the support portion 32424. One end of the body 32420 is provided with a baffle 32422. The baffle 32422 is arranged adjacent to the extension portion 32421 along a direction perpendicular to the body 32420, but the baffle 32422 and the extension portion 32421 extend on both sides of the plate surface of the body 32420, respectively.

[0064] Preferably, the stationary contact assembly 323 further includes a magnetic yoke 339, which is disposed within the assembly gap 32301. Preferably, the magnetic yoke 339 has a U-shaped structure, with the middle part of the magnetic yoke 339 attached to the side of the contact portion 3231 opposite to the stationary contact 3233, and the two ends of the magnetic yoke 339 extending from both sides of the contact portion 3231 toward the side where the stationary contact 3233 is located.

[0065] When the stationary contact assembly 323 of this embodiment is applied in a circuit breaker, the circuit breaker includes a housing, and at least one conductive unit is disposed within the housing. The conductive unit includes a pair of terminals, and a [property name missing] is disposed between the pair of terminals. Figure 1 , 2 The contact system and arc-extinguishing chamber 33 shown are described. The contact system includes a moving contact assembly 32 and a stationary contact assembly 323 as described in the above embodiment. The moving contact assembly 32 can adopt existing technology. The moving contact assembly 32 includes a rotating shaft 321 and a moving contact 322 connected to the rotating shaft 321. The moving contact 322 is provided with a moving contact point. The moving contact point is spaced apart from the stationary contact point 3233 of the contact portion 3231. The moving contact assembly 32 is electrically connected to an adjacent terminal through a connecting plate 34. The terminal portion 3232 is electrically connected to another adjacent terminal. The contact system is disposed in conjunction with the arc inlet of the arc-extinguishing chamber 33. The moving arc-starting angle that cooperates with the moving contact 322 can adopt existing technology.

[0066] In this embodiment, the arc-extinguishing chamber 33 preferably includes two interconnected arc-extinguishing cavities that form an angle with each other. Figure 1 , 2 In this configuration, two arc-extinguishing cavities are perpendicular to each other. The arc-extinguishing cavity arranged along the second direction is designated as the first arc-extinguishing cavity, and the arc-extinguishing cavity arranged along the first direction is designated as the second arc-extinguishing cavity. A first arc inlet is provided on the side of the first arc-extinguishing cavity (along its length). The stationary contact assembly 323 and the moving contact 322 are fitted together at the first arc inlet. Figure 1 , 2 As shown, the stationary contact plate 3230 is disposed through one arc-extinguishing cavity, and the stationary contact plate 3230 is located at the junction of two arc-extinguishing cavities. The mating area 3238 can connect the two arc-extinguishing cavities. The stationary arc-starting angle 334 extends along the side of the second arc-extinguishing cavity (the length of the second arc-extinguishing cavity). When the current flows through the contact part 3231, the magnetic yoke 339 and the contact part 3231 cooperate to generate a magnetic field. The moving contact assembly 32 and the stationary contact assembly 323 break the arc generated in the magnetic field. The arc is driven by the Lorentz force in the magnetic field and can be quickly transferred to the arc-extinguishing cavity, which is conducive to arc ignition. In addition, the second arc-blocking cover 3242 wrapped around the outside of the stationary contact plate 3230 can prevent the arc from eroding the stationary contact plate 3230. Its wrapping area can be adjusted according to the area of ​​the stationary contact plate 3230 located in the arc-extinguishing cavity.

[0067] Each arc-extinguishing cavity is provided with at least one grid plate group. The grid plate group in the first arc-extinguishing cavity is arranged along the second direction, and the grid plate group in the second arc-extinguishing cavity is arranged along the first direction. The adjacent ends of the grid plate groups in the two arc-extinguishing cavities can be connected in series by the arc-initiating plate 335. That is, the two ends of the arc-initiating plate 335 provided on the stationary contact plate 3230 are respectively located in the two arc-extinguishing cavities. One end of the arc-initiating plate 335 is spaced apart from one end of the grid plate group in the first arc-extinguishing cavity, and the other end of the arc-initiating plate 335 is spaced apart from one end of the grid plate group in the second arc-extinguishing cavity.

[0068] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used during use. They are only for ease of description and do not indicate that the device or component referred to must have a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating relative importance.

[0069] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. A stationary contact assembly, comprising a stationary contact plate (3230) and a stationary arc angle (334), wherein the two ends of the stationary contact plate (3230) are respectively provided with a contact portion (3231) and a wiring portion (3232), and the contact portion (3231) is provided with a stationary contact point (3233), characterized in that: The stationary contact plate (3230) connecting the contact portion (3231) and the wiring portion (3232) is provided with a through hole serving as a mating area (3238). The stationary arc angle (334) is provided on the side opposite to the stationary contact point (3233) in a direction parallel to the surface of the stationary contact plate (3230). One end of the stationary arc angle (334) is provided with a stationary arc portion (3341). The stationary arc portion (3341) passes through the mating area (3238) and connects to the contact portion (3231). The other end of the stationary arc angle (334) extends in a direction away from the contact portion (3231).

2. The stationary contact assembly according to claim 1, characterized in that: The static arc portion (3341) is connected to the edge of the static contact (3233).

3. The stationary contact assembly according to claim 1 or 2, characterized in that: There are at least two contact points between the stationary arc-drawing portion (3341) and the stationary contact plate (3230). The stationary arc-drawing portion (3341) is connected to the contact portion (3231) near the stationary contact (3233) to form a contact portion (3231). The stationary arc-drawing portion (3341) away from the stationary contact (3233) has at least another contact point with the area of ​​the stationary contact plate (3230) opposite to the stationary contact (3233) after passing through the mating area (3238).

4. The stationary contact assembly according to claim 1, characterized in that: It also includes an arc-inducing plate (335), one end of which is connected to a stationary contact plate (3230) near the wiring part (3232), and the other end of which extends away from the stationary contact plate (3230) after passing through the mating area (3238). The middle part of the arc-inducing plate (335) and the stationary arc-inducing part (3341) are respectively arranged along the opposite sides of the mating area (3238), so that an airflow channel (3239) is formed between the middle part of the arc-inducing plate (335) and the stationary arc-inducing part (3341).

5. The stationary contact assembly according to claim 4, characterized in that: The middle part of the static arc-drawing section (3341) is bent at least once to form an arc-drawing protrusion (33410), which protrudes towards the arc-drawing plate (335) to narrow the entrance (32391) of the airflow channel (3239).

6. The stationary contact assembly according to claim 1, characterized in that: It also includes an arc-blocking cover, which at least covers one side of the stationary contact plate (3230).

7. The stationary contact assembly according to claim 6, characterized in that: The arc-blocking cover and the stationary contact (3233) are located on the same side of the stationary contact plate (3230). The arc-blocking cover is divided into a first arc-blocking cover (3241) and a second arc-blocking cover (3242). The first arc-damping shield (3241) covers one end of the stationary contact plate (3230) away from the wiring part (3232). The second arc-blocking cover (3242) covers the plate surface of the stationary contact plate (3230) located between the wiring part (3232) and the contact part (3231). The second arc-blocking cover (3242) has a groove (32425) in the middle corresponding to the mating area (3238). The second arc-blocking cover (3242) has a baffle (32422) near the edge of the wiring part (3232). The edge of the second arc-blocking cover (3242) has an arc-inducing structure. At least part of the arc-inducing structure is arranged around the groove (32425), and the arc-inducing structure extends on the side of the stationary contact plate (3230) opposite to the contact part (3231).

8. The stationary contact assembly according to claim 7, characterized in that: At least a portion of the arc-initiating structure is formed by extending from the edge of the groove (32425), the arc-initiating structure including an extension (32421) and / or an arc-initiating leg (32423). The extension (32421) and the stationary arc-drawing portion (3341) are spaced apart and opposite each other in the mating area (3238), and the end of the extension (32421) extends on the side of the stationary contact plate (3230) opposite to the contact portion (3231). The arc-guiding legs (32423) are arranged along the opposite two sides of the groove (32425). Each arc-guiding leg (32423) extends on the side opposite to the stationary contact plate (3230) of the contact part (3231). The end of each arc-guiding leg (32423) is provided with an inclination angle so that the interval between the two arc-guiding legs (32423) is maximized at the position away from the stationary contact plate (3230).

9. The stationary contact assembly according to claim 8, characterized in that: The arc-inducing structure also includes a support portion (32424), which is formed by extending from the edge of the second arc-blocking cover (3242). Each support portion (32424) forms a receiving space with an adjacent arc-inducing leg (32423). The stationary contact plates (3230) located on both sides of the mating area (3238) are correspondingly arranged in the receiving space.

10. The stationary contact assembly according to claim 1, characterized in that: It also includes a magnetic yoke (339), the middle part of which is attached to the side of the contact portion (3231) opposite to the stationary contact (3233), and the two ends of the magnetic yoke (339) extend from both sides of the contact portion (3231) toward the side where the stationary contact (3233) is located.

11. The stationary contact assembly according to claim 1, characterized in that: The stationary contact plate (3230) is a straight plate. A through hole is provided in the middle of the stationary contact plate (3230) as a mating area (3238). One end of the stationary contact plate (3230) is folded back and extended to form a contact part (3231). An assembly gap (32301) is left between the contact part (3231) and the plate surface of the stationary contact plate (3230). At least a part of the contact part (3231) corresponds to the mating area (3238). The other end of the stationary contact plate (3230) is provided with a wiring hole as a wiring part (3232).

12. The stationary contact assembly according to claim 1, characterized in that: The static arc angle (334) is a straight plate. One end of the static arc angle (334) is folded back to form a static arc part (3341), and the other end of the static arc angle (334) is bent to form a static sharp corner part (3342). The static arc angle (334) and the static sharp corner part (3342) are located on opposite sides of the plate surface of the static arc angle (334).

13. A circuit breaker, comprising a housing, wherein at least one pair of terminals are disposed within the housing, and a moving contact (322) is disposed within the housing, characterized in that: The housing is further provided with a stationary contact assembly (323) as described in any one of claims 1-12, wherein the stationary contact (3233) of the contact portion (3231) is spaced apart from the moving contact (322), and the wiring portion (3232) is connected to an adjacent terminal.

14. The circuit breaker according to claim 13, characterized in that: The outer casing is also provided with an arc-extinguishing chamber (33), which includes two interconnected arc-extinguishing cavities that form an angle with each other. The stationary contact plate (3230) is disposed through one of the arc-extinguishing cavities. The stationary arc-drawing angle (334) cooperates with the other arc-extinguishing cavity. The cooperation area (3238) corresponds to the connection point of the two arc-extinguishing cavities.

15. The circuit breaker according to claim 14, characterized in that: Each arc-extinguishing chamber is provided with at least one grid plate group, and an arc-inducing plate (335) is provided between the grid plate groups of two arc-extinguishing chambers. The arc-inducing plate (335) passes through the mating area (3238) and forms an airflow channel (3239) with the stationary arc-inducing part (3341) in the mating area (3238) at intervals.

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