Contact system and circuit breaker

Abstract

The utility model belongs to the technical field of low-voltage electric appliances, and discloses a contact system and a circuit breaker. The contact system comprises a moving contact and a static contact assembly. The moving contact comprises a moving contact plate which is rotatably arranged and a moving contact point which is arranged on the moving contact plate; the static contact assembly comprises a support, a static contact, an arc striking piece and an arc extinguishing cover shell, the static contact comprises a static contact plate rotationally connected with the support and a static contact arranged on the static contact plate, the static contact plate is conducted with the arc striking piece and can drive the arc striking piece to rotate in the direction away from the moving contact, and the arc extinguishing cover shell is rotationally connected with the support. The static contact plate can drive the arc extinguishing housing to rotate. When the moving contact is separated from the static contact, the moving contact plate is finally separated from the arc striking piece, and the static contact plate drives the arc extinguishing housing to rotate, so that the arc extinguishing housing cuts off the electric arc between the moving contact plate and the arc striking piece. The contact system not only can prevent the electric arc from appearing between the movable contact and the static contact, but also can quickly extinguish the electric arc, thereby reducing the burning loss of the electric arc to parts.

Description

Technical Field

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

[0002] A circuit breaker typically consists of a contact system, an arc-extinguishing system, an operating mechanism, a trip unit, and a housing. The contact system includes moving contacts and stationary contacts, which are used to switch the circuit on and off. Traditional circuit breakers generate an electric arc when the moving and stationary contacts separate. The presence of this arc not only delays the circuit breaker's breaking time but also burns the contacts on the moving and stationary contacts, and may even damage the load and internal components of the circuit breaker.

[0003] To reduce the impact of electric arcs on circuit breakers, most circuit breakers on the market are equipped with arc-starting angles and arc-extinguishing chambers. The arc-starting angles guide the arc into the arc-extinguishing chamber to extinguish it, or the arc-extinguishing chambers cut off the arc to improve the arc-extinguishing performance of the circuit breaker. However, the arc still occurs between the moving and stationary contacts, and the problem of contact erosion still exists. Furthermore, the arc-extinguishing method of guiding the arc into the arc-extinguishing chamber through the arc-starting angle takes a long time and has low arc-extinguishing efficiency, resulting in poor effectiveness in reducing arc-damaged components.

[0004] Therefore, there is an urgent need to propose a contact system and circuit breaker to solve the above-mentioned technical problems. Utility Model Content

[0005] According to one aspect of the present invention, the present invention provides a contact system that can prevent electric arcs from occurring between moving and stationary contacts, effectively protecting the moving and stationary contacts, and can also quickly extinguish electric arcs, reducing the burn damage of components caused by electric arcs and improving the breaking performance of the circuit breaker.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] Contact system, including:

[0008] The moving contact includes a rotatably mounted moving contact plate and a moving contact point mounted on the moving contact plate;

[0009] A stationary contact assembly includes a bracket, a stationary contact, an arc-initiating element, and an arc-extinguishing cover. The stationary contact includes a stationary contact plate rotatably connected to the bracket and a stationary contact point disposed on the stationary contact plate. The stationary contact plate is conductive to the arc-initiating element and can drive the arc-initiating element to rotate away from the moving contact. The arc-extinguishing cover is rotatably connected to the bracket, and the stationary contact plate can drive the arc-extinguishing cover to rotate.

[0010] During the closing process of the moving contact and the stationary contact, the moving contact plate first contacts and conducts electricity with the arc-initiating element, and then the moving contact contacts and conducts electricity with the stationary contact. During the separation process of the moving contact and the stationary contact, the moving contact plate and the arc-initiating element finally separate, and the stationary contact plate can drive the arc-extinguishing cover to rotate, causing the arc-extinguishing cover to cut off the arc between the moving contact plate and the arc-initiating element.

[0011] Optionally, the contact system further includes:

[0012] A first base, wherein the first base is provided with a first mounting cavity and an opening, the first mounting cavity is used to mount the moving contact, and the opening communicates with the first mounting cavity;

[0013] The second base is detachably connected to the first base. The second base has a second mounting cavity that communicates with the opening. The second mounting cavity is used to install the stationary contact assembly. During the process of the moving contact separating from the stationary contact, the arc-extinguishing cover can block the opening.

[0014] Optionally, the arc-extinguishing cover includes an arc-blocking plate and a connecting plate. The arc-blocking plate is used to cut off the electric arc between the moving contact plate and the arc-initiating element. The connecting plate is disposed on opposite sides of the arc-blocking plate. At least one of the connecting plates is provided with a sliding guide portion. The stationary contact plate is provided with guide posts corresponding to the sliding guide portions. The guide posts are slidably connected to the sliding guide portions, so that while the stationary contact plate drives the arc-extinguishing cover to rotate, the arc-extinguishing cover can rotate relative to the stationary contact plate.

[0015] Optionally, the sliding guide portion is a guide notch formed on the connecting plate, and the guide post is slidably disposed within the guide notch.

[0016] Optionally, the guide notch includes a flared section and a bent section, the bent section being connected to the flared section. During the separation of the moving contact and the stationary contact, the guide post slides from the flared section to the bent section. When the guide post slides in the flared section, the rotational speed of the arc-extinguishing cover is less than or equal to the rotational speed of the stationary contact. When the guide post slides in the bent section, the rotational speed of the arc-extinguishing cover is greater than the rotational speed of the stationary contact.

[0017] Optionally, each of the connecting plates is provided with a connecting hole, and the bracket is provided with a first rotating shaft corresponding to each of the connecting holes. The first rotating shaft is connected to the corresponding connecting hole, and the arc extinguishing cover can rotate around the first rotating shaft.

[0018] Optionally, the stationary contact plate is provided with a first through hole, the arc-initiating member includes an arc-initiating plate and mounting walls disposed on opposite sides of the arc-initiating plate, the two mounting walls are mounted on both sides of the stationary contact plate, each mounting wall is provided with a mounting hole corresponding to the first through hole, the first connecting shaft passes through the two mounting holes and the first through hole to connect the arc-initiating member and the stationary contact plate, and at least one end of the first connecting shaft extends to form the guide post.

[0019] Optionally, the outer peripheral wall of the first connecting shaft is provided with a plurality of ribs, the plurality of ribs being spaced apart along the circumference of the first connecting shaft, and the first connecting shaft being press-fitted with the first through hole through the plurality of ribs.

[0020] Optionally, the moving contact plate has an arc-inducing protrusion at the end near the moving contact. During the closing process between the moving contact and the stationary contact, the moving contact plate first contacts and conducts communication with the arc-inducing element through the arc-inducing protrusion.

[0021] According to another aspect of the present invention, a circuit breaker is also provided, comprising a housing and a contact system as described in any of the above technical solutions, wherein the contact system is disposed within the housing.

[0022] The beneficial effects of this utility model are:

[0023] This invention provides a contact system including a moving contact and a stationary contact assembly. During the separation and repulsion process of the moving and stationary contacts, the moving contact separates from the stationary contact first, and then the moving contact plate separates from the arc-starting element last. This ensures that the arc is generated between the moving contact plate and the arc-starting element, rather than between the moving and stationary contacts, effectively protecting both the moving and stationary contacts and extending the service life of the contact system. Furthermore, during the separation and repulsion process, the moving and stationary contacts rotate in opposite directions to repel each other, increasing the maximum repulsion distance between the arc-starting element and the moving contact plate, thereby enhancing the arc-extinguishing effect. In addition, during the mutual repulsion process, the stationary contact plate drives the arc-extinguishing cover to rotate, causing the arc-extinguishing cover to cut off the arc between the moving contact plate and the arc-starting element, shortening the arc-extinguishing time and reducing the burn damage to components caused by the arc.

[0024] This utility model also provides a circuit breaker, including a housing and the aforementioned contact system. Due to the use of the aforementioned contact system, this circuit breaker has good arc-extinguishing performance and a long service life. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0026] Figure 1 This is a cross-sectional view of the contact system provided in this embodiment of the utility model. Figure 1 (The moving contact and the stationary contact are in the closed state);

[0027] Figure 2 This is a cross-sectional view of the contact system provided in this embodiment of the utility model. Figure 2 (The moving contact and the stationary contact are in a disconnected and repelled state);

[0028] Figure 3 This is a schematic diagram of the contact system provided in an embodiment of the present invention;

[0029] Figure 4 This is an exploded view of the contact system provided in an embodiment of the present invention;

[0030] Figure 5 This is a schematic diagram of the structure of the moving contact provided in an embodiment of the present utility model;

[0031] Figure 6 This is a schematic diagram of the structure of the stationary contact assembly provided in an embodiment of the present utility model;

[0032] Figure 7 This is a cross-sectional view of the stationary contact assembly provided in an embodiment of the present utility model;

[0033] Figure 8 This is an exploded view of the stationary contact assembly provided in an embodiment of the present utility model;

[0034] Figure 9 This is a schematic diagram of the arc-extinguishing cover provided in this embodiment of the utility model;

[0035] Figure 10 This is a schematic diagram of the arc-starting component provided in an embodiment of the present invention;

[0036] Figure 11 This is a schematic diagram of the structure of the stationary contact provided in an embodiment of the present invention;

[0037] Figure 12 This is a partial schematic diagram of the first connecting shaft provided in an embodiment of the present utility model;

[0038] Figure 13 This is a schematic diagram of the structure of the static contact cover provided in this embodiment of the utility model;

[0039] Figure 14 This is a schematic diagram of the structure of the bracket provided in an embodiment of the present utility model.

[0040] In the picture:

[0041] 100. Moving contact; 110. Moving contact plate; 111. Arc-inducing protrusion; 120. Moving contact point;

[0042] 200. Stationary contact assembly; 210. Bracket; 211. First rotating shaft; 212. Eighth through hole; 213. Ninth through hole; 214. Clearance notch; 220. Stationary contact; 221. Stationary contact plate; 2211. First through hole; 2212. Elastic element mounting space; 2213. Fifth through hole; 2214. Seventh through hole; 2215. Tenth through hole; 222. Stationary contact point; 230. Arc ignition element; 231. Arc ignition plate; 232. Mounting wall; 2321. Mounting hole; 240. Arc extinguishing cover; 241. Arc isolation. Plate; 242, Connecting plate; 243, Guide notch; 2431, Flared section; 2432, Bending section; 244, Connecting hole; 250, Guide post; 260, First connecting shaft; 261, Raised rib; 270, First elastic reset member; 280, Static contact cover; 281, Third through hole; 282, Fourth through hole; 283, Sixth through hole; 290, Second connecting shaft; 291, Third connecting shaft; 292, Second rotating shaft; 293, Second elastic reset member; 294, Fourth connecting shaft; 295, Fifth connecting shaft;

[0043] 300, First base; 310, First mounting cavity; 320, Opening;

[0044] 400, Second base; 410, Second mounting cavity. Detailed Implementation

[0045] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0046] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0047] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0048] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0049] This embodiment provides a contact system that can prevent electric arcs from occurring between moving and stationary contacts, effectively protecting both moving and stationary contacts, and can also quickly extinguish electric arcs, reducing the burn damage to components caused by electric arcs and improving the breaking performance of the circuit breaker.

[0050] Specifically, such as Figures 1-7 As shown, the contact system includes a moving contact 100 and a stationary contact assembly 200. The moving contact 100 includes a rotatably mounted moving contact plate 110 and a moving contact 120 mounted on the moving contact plate 110. The stationary contact assembly 200 includes a support 210, a stationary contact 220, an arc-starting element 230, and an arc-extinguishing cover 240. The stationary contact 220 includes a stationary contact plate 221 rotatably connected to the support 210 and a stationary contact 222 mounted on the stationary contact plate 221. The stationary contact plate 221 is electrically connected to the arc-starting element 230 and can drive the arc-starting element 230 to rotate away from the moving contact 100. The stationary contact plate 221 can drive the arc-extinguishing cover 240 to rotate.

[0051] See also Figure 1 During the closing process of the moving contact 100 and the stationary contact 220, the moving contact plate 110 first contacts and conducts electricity with the arc-initiating element 230, and then the moving contact 120 contacts and conducts electricity with the stationary contact 222.

[0052] See also Figure 2During the separation of the moving contact 100 and the stationary contact 220, the moving contact plate 110 and the arc-initiating element 230 separate last. This means the arc is generated between the moving contact plate 110 and the arc-initiating element 230, rather than between the moving contact 120 and the stationary contact 222. This effectively protects both the moving contact 120 and the stationary contact 222, extending the service life of the contact system. Furthermore, during the separation of the moving contact 100 and the stationary contact 220, they rotate in opposite directions to repel each other, increasing the maximum repulsion distance between the arc-initiating element 230 and the moving contact plate 110, thereby enhancing the arc-extinguishing effect. In addition, during the process of the moving contact 100 and the stationary contact 220 repelling each other, the stationary contact plate 221 will drive the arc extinguishing cover 240 to rotate, so that the arc extinguishing cover 240 cuts off the arc between the moving contact plate 110 and the arc ignition element 230, shortening the arc extinguishing time and thus reducing the burn damage of the components caused by the arc.

[0053] Further, see also Figure 3 and Figure 4 The contact system also includes a first base 300 and a second base 400. The first base 300 has a first mounting cavity 310 and an opening 320. The first mounting cavity 310 is used to mount the moving contact 100, and the opening 320 communicates with the first mounting cavity 310. The second base 400 is detachably connected to the first base 300. The second base 400 has a second mounting cavity 410 communicating with the opening 320. The second mounting cavity 410 is used to mount the stationary contact assembly 200. During the separation of the moving contact 100 and the stationary contact 220, the arc-extinguishing cover 240 can block the opening 320.

[0054] It is understood that the opening 320 on the first base 300 connects the first mounting cavity 310 and the second mounting cavity 410. When the moving contact 100 and the stationary contact 220 are in the closed state, the moving contact 120 and the stationary contact 222, as well as the moving contact plate 110 and the arc-starting element 230, are closed through the opening 320. During the process of the moving contact 100 and the stationary contact 220 breaking and repelling each other, the moving contact 100 and the stationary contact 220 rotate in the direction of mutual repulsion. Finally, the stationary contact plate 221 will drive the arc-extinguishing cover 240 to rotate, so that the arc-extinguishing cover 240 cuts off the arc between the moving contact plate 110 and the arc-starting element 230 and blocks it at the opening 320. In this way, the first mounting cavity 310 and the second mounting cavity 410 can be separated from each other, thereby effectively extinguishing the arc.

[0055] Furthermore, the first base 300 and the second base 400 are detachably connected, so that the moving contact 100 and the first base 300, as well as the stationary contact assembly 200 and the second base 400, form a modular structure, which facilitates assembly.

[0056] Optionally, in this embodiment, the second base 400 is disposed below the position where the first base 300 has the first mounting cavity 310.

[0057] Furthermore, the first base 300 and the second base 400 can be connected by bolts. Specifically, both the first base 300 and the second base 400 are provided with second through holes. A nut is embedded in one of the second through holes, and the bolt passes through the other second through hole and is connected to the nut, thereby realizing the assembly of the first base 300 and the second base 400. The structure is simple and facilitates the installation and disassembly of the first base 300 and the second base 400.

[0058] Further, see also Figure 1 , Figure 2 and Figure 5 The moving contact plate 110 has an arc-inducing protrusion 111 at its end near the moving contact 120. During the closing process between the moving contact 100 and the stationary contact 220, the moving contact plate 110 first contacts and conducts electricity with the arc-inducing element 230 through the arc-inducing protrusion 111, and then the moving contact 120 contacts and conducts electricity with the stationary contact 222. During the breaking process between the moving contact 100 and the stationary contact 220, the moving contact 120 first separates from the stationary contact 222, and then the arc-inducing protrusion 111 separates from the arc-inducing element 230. By setting the arc-inducing protrusion 111, on the one hand, it is convenient to achieve contact and conduction between the moving contact plate 110 and the arc-inducing element 230; on the other hand, it can prevent the generation of an electric arc between the moving contact 120 and the stationary contact 222, thus avoiding burning of the moving contact 120 and the stationary contact 222.

[0059] Optionally, the arc-inducing protrusion 111 can be integrated with the moving contact plate 110 to facilitate processing and assembly.

[0060] Furthermore, such as Figures 6-9 As shown, the arc-extinguishing housing 240 includes an arc-blocking plate 241 and a connecting plate 242. The arc-blocking plate 241 is used to cut off the arc between the moving contact plate 110 and the arc-starting element 230. The connecting plate 242 is disposed on opposite sides of the arc-blocking plate 241. At least one connecting plate 242 is provided with a sliding guide portion. The stationary contact plate 221 is provided with guide posts 250 corresponding to the sliding guide portions. The guide posts 250 are slidably connected to the sliding guide portions, so that while the stationary contact plate 221 drives the arc-extinguishing housing 240 to rotate, the arc-extinguishing housing 240 can rotate relative to the stationary contact plate 221. The transmission between the stationary contact plate 221 and the arc-extinguishing housing 240 is realized through the sliding cooperation between the guide posts 250 and the sliding guide portions. The structure is simple and the transmission effect is good.

[0061] It is worth noting that the arc-extinguishing cover 240 is designed to rotate relative to the stationary contact plate 221. This is to ensure that the arc-blocking plate 241 can move above the stationary contact 222 and the arc-initiating element 230, so as to cut off the arc.

[0062] In this embodiment, each connecting plate 242 is provided with a sliding guide.

[0063] Further, see also Figure 6 and Figure 8 In one possible embodiment, the sliding guide portion is a guide notch 243 formed on the connecting plate 242, and the guide post 250 is slidably disposed within the guide notch 243. This arrangement has two advantages: firstly, the guide post 250 can be assembled through the opening 320 of the guide notch 243, reducing assembly difficulty; secondly, the structure is simple and facilitates the processing of the arc-extinguishing cover 240. Of course, in other embodiments, the sliding guide portion can also be a groove provided on the connecting plate 242, or it can be a sliding hole provided on the connecting plate 242, depending on actual needs; this application does not impose specific limitations.

[0064] It is worth noting that the shape of the guide notch 243 can be set according to the required rotation angle of the arc extinguishing cover 240, such as arc shape, broken line shape, etc.

[0065] Optionally, see [link to relevant documentation] Figure 6 and Figure 9 In this embodiment, the guide notch 243 includes a flared section 2431 and a bent section 2432, which are connected to the flared section 2431. During the separation of the moving contact 100 and the stationary contact 220, the guide post 250 slides from the flared section 2431 to the bent section 2432. That is, when the moving contact 100 and the stationary contact 220 are in a closed state, the guide post 250 is located within the flared section 2431.

[0066] Furthermore, when the guide post 250 slides on the flared section 2431, the rotational speed of the arc-extinguishing cover 240 is less than or equal to the rotational speed of the stationary contact 220. For example... Figure 1 As shown, at the beginning of the separation of the stationary contact 220 and the moving contact 100, the height of the arc-extinguishing cover 240 is lower than the height of the stationary contact 222. Therefore, the rotation speed of the arc-extinguishing cover 240 is initially slow to avoid the arc-extinguishing cover 240 impacting and damaging the stationary contact 220. Figure 2 As shown, when the stationary contact 220 rotates to a certain angle, its height is lower than that of the arc-extinguishing cover 240. At this time, the arc-extinguishing cover 240 will not interfere with the stationary contact 220. The guide post 250 slides into the bending section 2432. The rotation speed of the arc-extinguishing cover 240 is greater than that of the stationary contact 220. By rapidly rotating to cover the stationary contact 220, the arc is quickly cut off.

[0067] That is, by setting the guide notch 243, including the flared section 2431 and the bending section 2432, the stability and reliability of the arc-extinguishing cover 240 can be improved. In addition, the flared section 2431 can both prevent the rapid rotation of the arc-extinguishing cover 240 and reduce the assembly difficulty of the guide column 250.

[0068] In this embodiment, the flared section 2431 and the bent section 2432 are arranged at an angle.

[0069] Further, see also Figure 6 and Figure 9 Each connecting plate 242 is provided with a connecting hole 244, and the bracket 210 is provided with a first rotating shaft 211 corresponding to each connecting hole 244. The first rotating shaft 211 is connected to the corresponding connecting hole 244, and the arc-extinguishing cover 240 can rotate around the first rotating shaft 211. The rotational connection between the arc-extinguishing cover 240 and the bracket 210 is achieved through the cooperation of the first rotating shaft 211 and the connecting hole 244. The structure is simple and the rotation is smooth.

[0070] Furthermore, such as Figure 6 , Figure 10 and Figure 11 As shown, the stationary contact plate 221 has a first through hole 2211. The arc-initiating component 230 includes an arc-initiating plate 231 and mounting walls 232 disposed on opposite sides of the arc-initiating plate 231. The two mounting walls 232 are mounted on both sides of the stationary contact plate 221. Each mounting wall 232 has a mounting hole 2321 corresponding to the first through hole 2211. The first connecting shaft 260 passes through the two mounting holes 2321 and the first through hole 2211 to connect the arc-initiating component 230 and the stationary contact plate 221. At least one end of the first connecting shaft 260 extends to form a guide post 250. With this configuration, the first connecting shaft 260 serves both to connect the arc-initiating component 230 and the stationary contact plate 221 and to form a guide post 250 to drive the arc-extinguishing cover 240 to rotate, realizing the "dual function" of the first connecting shaft 260 and simplifying the structure of the stationary contact assembly 200.

[0071] In this embodiment, both ends of the first connecting shaft 260 extend to form guide posts 250.

[0072] Further, see also Figure 1 , Figure 2 and Figure 6 One end of the arc-initiating plate 231 protrudes towards the moving contact 100. During the closing process between the moving contact 100 and the stationary contact 220, the arc-initiating plate 231 can contact and conduct electricity with the arc-initiating protrusion 111.

[0073] Furthermore, such as Figure 12As shown, the outer peripheral wall of the first connecting shaft 260 is provided with multiple protruding ribs 261, which are spaced apart circumferentially along the first connecting shaft 260. The first connecting shaft 260 is press-fitted with the first through hole 2211 through the multiple protruding ribs 261. The engagement between the protruding ribs 261 and the first through hole 2211 prevents the first connecting shaft 260 from moving axially along the first through hole 2211, improving the stability of the position of the first connecting shaft 260 and thus ensuring the reliability of the end of the first connecting shaft 260 as a guide post 250 driving the arc-extinguishing cover 240 to rotate.

[0074] Optionally, in one possible embodiment, the arc-initiating member 230 is rotatable about the first connecting shaft 260, and a first elastic reset member 270 is provided between the arc-initiating member 230 and the stationary contact plate 221. The first elastic reset member 270 is configured to always have a tendency to push the arc-initiating member 230 toward the stationary contact plate 221. The arc-initiating member 230 is configured to rotate about the first connecting shaft 260, allowing it to rotate relative to the stationary contact 220. During the closing process of the moving contact 100 and the stationary contact 220, the moving contact plate 110 presses against the arc-initiating member 230, causing it to rotate away from the stationary contact 220, and the first elastic reset member 270 stores elastic potential energy. During the separation and mutual repulsion process of the moving contact 100 and the stationary contact 220, the first elastic reset member 270 drives the arc-initiating member 230 to rotate toward the stationary contact 220, causing it to abut against the stationary contact plate 221. By setting the first elastic reset member 270, when the moving contact plate 110 contacts the arc-starting member 230, the elastic force of the first elastic reset member 270 can ensure reliable contact between the moving contact plate 110 and the arc-starting member 230, thereby improving the reliability of the conduction between the moving contact plate 110 and the arc-starting member 230.

[0075] Optionally, the arc-starting element 230 can be electrically connected to the stationary contact plate 221 via the first elastic reset element 270. Alternatively, the arc-starting element 230 can be electrically connected via direct contact with the stationary contact plate 221; in this configuration, conductive paste can be applied between the arc-starting element 230 and the stationary contact plate 221. The arc-starting element 230 and the stationary contact 220 can also be electrically connected via a soft conductor to reduce resistance.

[0076] Optionally, such as Figure 6 , Figure 7 , Figure 8 and Figure 13As shown, in this embodiment, the first elastic reset member 270 is a torsion spring. Specifically, an elastic member mounting space 2212 is provided on the stationary contact plate 221, and the torsion spring is installed in the elastic member mounting space 2212. One end of the torsion spring abuts against the inner wall of the elastic member mounting space 2212, and the other end abuts against the arc-inducing member 230. A stationary contact cover 280 is provided outside the stationary contact 220, covering the stationary contact 220. Third through holes 281 are provided on the opposite side walls of the stationary contact cover 280, and the third through holes 281 are arranged opposite to the elastic member mounting space 221. The second connecting shaft 290 passes through the two third through holes 281 and the helical part of the torsion spring. The torsion spring is fixed by the stationary contact cover 280 and the second connecting shaft 290. On the one hand, the structure is simple and easy to assemble; on the other hand, the stationary contact cover 280 can protect the stationary contact 220, which is beneficial to protecting the stationary contact 220.

[0077] Optionally, the first elastic reset element 270 can also be a tension spring, a compression spring, or a spring sheet, etc., which can be set according to actual needs, and this application does not make specific limitations.

[0078] See also Figure 13 In this embodiment, the opposite side walls of the stationary contact cover 280 are also provided with fourth through holes 282, and the two ends of the first connecting shaft 260 pass through the corresponding fourth through holes 282 to form guide posts 250.

[0079] Further, see also Figure 7 , Figure 8 , Figure 11 and Figure 13 The stationary contact plate 221 is also provided with a fifth through hole 2213, and the opposite side walls of the stationary contact cover 280 are provided with a sixth through hole 283. The third connecting shaft 291 passes through the fifth through hole 2213 and the two sixth through holes 283 to connect the stationary contact plate 221 and the stationary contact cover 280. The structure is simple and easy to assemble.

[0080] Optionally, see [link to relevant documentation] Figure 6 , Figure 7 , Figure 8 , Figure 11 and Figure 14 The stationary contact plate 221 is also provided with a seventh through hole 2214, and the opposite side walls of the bracket 210 are provided with eighth through holes 212. The second rotating shaft 292 passes through the seventh through hole 2214 and the two eighth through holes 212, and the stationary contact plate 221 can rotate around the second rotating shaft 292. The rotational connection between the stationary contact plate 221 and the bracket 210 is achieved through the cooperation of the second rotating shaft 292 with the bracket 210 and the stationary contact plate 221. The structure is simple, easy to assemble, and has good rotational smoothness.

[0081] Further, see also Figure 6 , Figure 7 , Figure 8 , Figure 11 and Figure 14 The stationary contact assembly 200 also includes a second elastic reset member 293, a fourth connecting shaft 294, and a fifth connecting shaft 295. The support 210 has a ninth through hole 213 on each of its opposite side walls. Both ends of the fourth connecting shaft 294 pass through the corresponding ninth through hole 213, and the second elastic reset member 293 is mounted on the fourth connecting shaft 294. The stationary contact plate 221 also has a tenth through hole 2215, and the fifth connecting shaft 295 passes through the tenth through hole 2215. Furthermore, one end of the second elastic reset member 293 is connected to the support 210, and the other end abuts against the fifth connecting shaft 295. This configuration allows for the automatic reset of the stationary contact 220 via the second elastic reset member 293. That is, when the electrodynamic repulsion between the moving contact 100 and the stationary contact 220 disappears, the stationary contact 220 will rotate and reset under the action of the second elastic reset member 293, and the arc-extinguishing cover 240 will also gradually reset to its initial position under the drive of the guide post 250.

[0082] Optionally, the second elastic reset member 293 may be, but is not limited to, a torsion spring, with the helical portion of the torsion spring sleeved on the fourth connecting shaft 294.

[0083] Optionally, a slot can be provided on the bracket 210 so that one end of the second elastic reset member 293 can be inserted into the slot. The connection between the second elastic reset member 293 and the bracket 210 is achieved by insertion, which is simple in structure and easy to assemble.

[0084] Further, see also Figure 14 In this embodiment, the bracket 210 is provided with clearance notches 214 on both opposite side walls to avoid the guide post 250, so as to ensure the reliability of the guide post 250.

[0085] Furthermore, this embodiment also provides a circuit breaker. It includes a housing and the aforementioned contact system. The contact system is disposed within the housing. Due to the use of the aforementioned contact system, this circuit breaker exhibits good arc-extinguishing performance and a long service life.

[0086] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A contact system, characterized in that, include: The moving contact (100) includes a rotatably disposed moving contact plate (110) and a moving contact (120) disposed on the moving contact plate (110); A stationary contact assembly (200) includes a bracket (210), a stationary contact (220), an arc-starting element (230), and an arc-extinguishing cover (240). The stationary contact (220) includes a stationary contact plate (221) rotatably connected to the bracket (210) and a stationary contact point (222) disposed on the stationary contact plate (221). The stationary contact plate (221) is conductive to the arc-starting element (230) and can drive the arc-starting element (230) to rotate away from the moving contact (100). The arc-extinguishing cover (240) is rotatably connected to the bracket (210), and the stationary contact plate (221) can drive the arc-extinguishing cover (240) to rotate. During the closing process of the moving contact (100) and the stationary contact (220), the moving contact plate (110) first contacts and conducts with the arc-initiating element (230), and then the moving contact (120) contacts and conducts with the stationary contact (222). During the separation process of the moving contact (100) and the stationary contact (220), the moving contact plate (110) and the arc-initiating element (230) finally separate. Furthermore, the stationary contact plate (221) can drive the arc-extinguishing cover (240) to rotate, thereby causing the arc-extinguishing cover (240) to cut off the arc between the moving contact plate (110) and the arc-initiating element (230).

2. The contact system according to claim 1, characterized in that, The contact system also includes: A first base (300) is provided with a first mounting cavity (310) and an opening (320) therein. The first mounting cavity (310) is used to mount the moving contact (100), and the opening (320) is connected to the first mounting cavity (310). The second base (400) is detachably connected to the first base (300). The second base (400) has a second mounting cavity (410) communicating with the opening (320). The second mounting cavity (410) is used to install the stationary contact assembly (200). During the process of the moving contact (100) and the stationary contact (220) separating and repelling each other, the arc-extinguishing cover (240) can block the opening (320).

3. The contact system according to claim 1, characterized in that, The arc-extinguishing cover (240) includes an arc-blocking plate (241) and a connecting plate (242). The arc-blocking plate (241) is used to cut off the electric arc between the moving contact plate (110) and the arc-initiating element (230). The connecting plate (242) is disposed on opposite sides of the arc-blocking plate (241). At least one of the connecting plates (242) is provided with a sliding guide portion. The stationary contact plate (221) is provided with guide posts (250) corresponding to the sliding guide portions. The guide posts (250) are slidably connected to the sliding guide portions so that while the stationary contact plate (221) drives the arc-extinguishing cover (240) to rotate, the arc-extinguishing cover (240) can rotate relative to the stationary contact plate (221).

4. The contact system according to claim 3, characterized in that, The sliding guide is a guide notch (243) opened on the connecting plate (242), and the guide post (250) is slidably disposed in the guide notch (243).

5. The contact system according to claim 4, characterized in that, The guide notch (243) includes a flared section (2431) and a bent section (2432), the bent section (2432) being connected to the flared section (2431). During the process of the moving contact (100) and the stationary contact (220) separating, the guide post (250) slides from the flared section (2431) to the bent section (2432). When the guide post (250) slides on the flared section (2431), the rotational speed of the arc-extinguishing cover (240) is less than or equal to the rotational speed of the stationary contact (220). When the guide post (250) slides on the bent section (2432), the rotational speed of the arc-extinguishing cover (240) is greater than the rotational speed of the stationary contact (220).

6. The contact system according to claim 3, characterized in that, Each of the connecting plates (242) is provided with a connecting hole (244), and the bracket (210) is provided with a first rotating shaft (211) corresponding to the connecting hole (244). The first rotating shaft (211) is connected to the corresponding connecting hole (244), and the arc extinguishing cover (240) can rotate around the first rotating shaft (211).

7. The contact system according to claim 3, characterized in that, The stationary contact plate (221) is provided with a first through hole (2211). The arc-inducing member (230) includes an arc-inducing plate (231) and mounting walls (232) disposed on opposite sides of the arc-inducing plate (231). The two mounting walls (232) are mounted on both sides of the stationary contact plate (221). Each mounting wall (232) is provided with a mounting hole (2321) corresponding to the first through hole (2211). A first connecting shaft (260) passes through the two mounting holes (2321) and the first through hole (2211) to connect the arc-inducing member (230) and the stationary contact plate (221). At least one end of the first connecting shaft (260) extends to form the guide post (250).

8. The contact system according to claim 7, characterized in that, The outer peripheral wall of the first connecting shaft (260) is provided with a plurality of protruding ribs (261), which are spaced apart along the circumference of the first connecting shaft (260). The first connecting shaft (260) is press-fitted with the first through hole (2211) through the plurality of protruding ribs (261).

9. The contact system according to any one of claims 1-8, characterized in that, The moving contact plate (110) is provided with an arc-inducing protrusion (111) at the end near the moving contact (120). During the closing process of the moving contact (100) and the stationary contact (220), the moving contact plate (110) first contacts and conducts communication with the arc-inducing element (230) through the arc-inducing protrusion (111).

10. A circuit breaker, characterized in that, It includes a housing and a contact system according to any one of claims 1-9, the contact system being disposed within the housing.

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