Contact system and circuit breaker

Abstract

The utility model provides a contact system and a circuit breaker, and belongs to the technical field of electrical equipment. The contact system provided by the utility model comprises a moving contact, a static contact and a static contact point. The moving contact is rotatably connected to the contact support, and the moving contact comprises a moving contact point. The static contact is arranged on one side of the moving contact, the static contact comprises a contact part, one end, close to the moving contact, of the contact part is provided with a first bending part, and the first bending part is bent back to the moving contact. The static contact is arranged on one side, facing the moving contact, of the contact part, and the moving contact rotates to enable the moving contact to be in contact with or separated from the static contact. The first bending part is arranged at one end, close to the moving contact, of the contact part, so that the distance between the first bending part and the moving contact can be increased. According to the circuit breaker, the possibility that an electric arc generated between the moving contact and the static contact is transferred to the position between the first bending part and the moving contact can be reduced, the time that the electric arc stops between the moving contact and the static contact can be shortened, therefore, the use of a static cover is reduced, and the purpose of saving the production cost of the circuit breaker can be achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrical equipment, in particular to a contact system and a circuit breaker. BACKGROUND

[0002] The circuit breaker refers to a switching device capable of closing, carrying and opening the current under normal circuit conditions, and capable of closing, carrying and opening the current under abnormal circuit conditions within a specified time. The circuit breaker usually includes a moving contact, a static contact and an arc extinguishing chamber.

[0003] When the circuit breaker is disconnected under abnormal circuit conditions, the moving contact and the static contact are separated, at this time, an arc is generated between the moving contact and the static contact, and the arc enters the arc extinguishing chamber for extinguishing. In the prior art, in order to reduce the stagnation time of the arc generated between the moving contact and the static contact, a static cover is usually arranged at the end of the static contact close to the moving rod of the moving contact, which increases the production cost of the circuit breaker. CONTENT OF THE UTILITY MODEL

[0004] The present application provides a contact system and a circuit breaker to reduce the production cost of the circuit breaker.

[0005] In a first aspect, the present application provides a contact system applied to a circuit breaker, the circuit breaker comprising a contact support, the contact system comprising: a moving contact, a static contact and a static contact point. The moving contact is rotationally connected to the contact support, and the moving contact comprises a moving contact point. The static contact is arranged on one side of the moving contact, and the static contact comprises a contact part, the contact part being provided with a first bending part at one end close to the moving contact, and the first bending part is bent away from the moving contact. The static contact point is arranged on the side of the contact part facing the moving contact, and the moving contact can rotate to make the moving contact point contact or separate from the static contact point.

[0006] Through the above-mentioned scheme, the first bending part is arranged at one end of the contact part close to the moving contact, and the first bending part is bent away from the moving contact, which can increase the distance between the first bending part and the moving contact. The arc will transfer from the two conductive parts with a long distance to the two conductive parts with a short distance, and through the above-mentioned arrangement, the possibility of the arc generated between the moving contact point and the static contact point transferring to the space between the first bending part and the moving contact during the breaking process of the circuit breaker can be reduced.

[0007] Moreover, compared with the prior art, the stagnation time of the arc between the moving contact and the static contact will be reduced. Moreover, the stagnation time of the arc between the moving contact and the static contact can be reduced by improving the structure of the static contact as above, so that the static cover does not need to be arranged at the end of the static contact close to the moving contact. In this way, the use of the static cover can be reduced, and the production cost of the circuit breaker can be saved.

[0008] In a possible design, the bending angle of the first bending part is greater than or equal to 0°, and the bending angle of the first bending part is less than or equal to 90°.

[0009] According to the above scheme, the bending angle of the first bending part can be flexibly selected according to the actual setting condition, so that the application range of the static contact mentioned in the application can be improved. The static contact mentioned in the application can be applied to most circuit breakers, so that the production cost of the circuit breaker can be reduced.

[0010] In a possible design, the movable contact includes a movable contact rod. The movable contact rod includes first and second ends opposite to each other, the first end is rotationally connected to the contact support, and the movable contact point is arranged at the second end. The shortest distance from the static contact point to the movable contact point is less than the distance from the first bending part to the movable contact rod.

[0011] According to the above scheme, the first end is rotationally connected to the contact support, and the movable contact point is arranged at the second end, so that the movable contact can drive the movable contact point to contact or separate from the static contact point during rotation. When the shortest distance from the static contact point to the movable contact point is less than the distance from the first bending part to the movable contact rod, the possibility of the arc generated between the movable contact point and the static contact point transferring to the first bending part and the movable contact can be reduced, so that the use of the static cover can be reduced, thereby saving the production cost of the circuit breaker.

[0012] In a possible design, the end of the contact part away from the movable contact is provided with a second bending part, and the static contact includes a fixed part. The second bending part is opposite to the first bending part in position, and the second bending part is bent towards the movable contact. The fixed part is connected to the end of the second bending part away from the first bending part.

[0013] According to the above scheme, the fixed part can be arranged in the circuit breaker, and the second bending part can make the fixed part and the contact part more suitable for the installation environment in the base after being connected, thereby reducing the installation difficulty of the static contact when being installed in the circuit breaker. In addition, the bending angle of the second bending part can also be selected according to the actual use requirement, so that the application range of the static contact is wider, so that the static contact mentioned in the application can be selected when different models of circuit breakers are used, thereby saving the use of the static cover when the circuit breaker is used, so as to save the production cost of the circuit breaker.

[0014] In a possible design, the fixed part is provided with a mounting hole, and the mounting hole is a circular through hole.

[0015] Through the above scheme, the installation hole can make the installation of the fixed part more convenient, so that the installation of the static contact is more convenient. When the installation hole is a circular hole, it can better adapt to the shape of the bolt, reducing the difficulty of installation of the static contact. When the shape of the installation hole is adapted to the bolt, the installation of the bolt is more stable, reducing the possibility of the static contact falling from the circuit breaker due to loose bolts, and improving the use reliability of the contact system.

[0016] In a possible design, a flow guide groove is arranged on the contact part, and the flow guide groove penetrates the contact part. The flow guide groove is arranged around the static contact point.

[0017] Through the above scheme, the flow guide groove penetrates the contact part and is arranged around the static contact point, so that the current cannot flow in a straight line when passing through the fixed part to the contact part and flowing through the static contact point, but will detour the flow guide groove to reach the static contact point. The current is diverted at the contact part to provide an electric repulsion force by current commutation to accelerate the separation of the moving contact and the static contact when a short circuit occurs in the loop, thereby ensuring that the moving contact and the static contact have sufficient electric repulsion force when they separate.

[0018] In a possible design, the flow guide groove is a U-shaped groove, and the static contact point is arranged close to the open end of the U-shaped groove.

[0019] Through the above scheme, the U-shaped flow guide groove can make the static contact mentioned in the application have the function of the U-shaped static contact in the prior art, thereby achieving the effect of changing the flow direction of the current in the static contact. It is not necessary to change the structure of the static contact to achieve the effect of changing the flow direction of the current in the static contact, which can save the manufacturing cost of the static contact. Moreover, the structure of the U-shaped flow guide groove is relatively simple, and the setting cost is relatively low, further saving the manufacturing cost of the static contact.

[0020] In a possible design, the static contact further includes an arc striking plate, and the arc striking plate is arranged on the contact part. The arc striking plate is arranged close to the static contact point, and the arc striking plate is bent towards the direction close to the moving contact.

[0021] Through the above scheme, during the opening process of the circuit breaker, an arc is generated between the moving contact and the static contact. The arc striking plate can attract the arc, so that the arc is more easily introduced into the arc extinguishing system. The arc striking plate is arranged close to the static contact point and is bent towards the moving contact. The arc generated when the moving contact and the static contact separate will move along the arc striking plate to the end of the arc striking plate, which can further increase the speed of the arc entering the arc extinguishing system, thereby ensuring the breaking performance of the circuit breaker.

[0022] In a possible design, the contact system further includes a magnetic enhancement member. The magnetic enhancement member is opposite to the static contact point, and the magnetic enhancement member is arranged on the side of the contact part away from the static contact point.

[0023] By the above scheme, the magnetic enhancer is arranged in the contact system, and the magnetic enhancer can generate a magnetic field under the action of the current at the moment when the moving contact and the static contact are separated, the generated magnetic field can increase the electric repulsion force applied by the static contact point to the moving contact point, so that the moving contact can be quickly separated from the static contact. In the process of quickly separating the moving contact and the static contact, the arc between the moving contact and the static contact can be quickly elongated, and the elongated arc can more easily enter the arc extinguishing system for extinguishing. In this way, the arc extinguishing effect of the circuit breaker can be improved.

[0024] In a second aspect, the application provides a circuit breaker, which comprises a base and the contact system mentioned in the first aspect. The contact system is installed in the base.

[0025] The circuit breaker provided in the second aspect has the beneficial effects of the first aspect and the possible implementation manners of the first aspect, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 The contact system provided in the embodiments of the application is installed in the base.

[0027] Figure 2 The contact system provided in the embodiments of the application is installed in the base.

[0028] Figure 3 The contact system provided in the embodiments of the application is installed in the base.

[0029] Figure 4 The contact system provided in the embodiments of the application is installed in the base.

[0030] Figure 5 The contact system provided in the embodiments of the application is installed in the base.

[0031] Figure 6 The contact system provided in the embodiments of the application is installed in the base.

[0032] BRIEF DESCRIPTION OF DRAWINGS

[0033] 100, moving contact; 110, moving contact point; 120, moving contact rod; 121, first end; 122, second end;

[0034] 200, static contact; 210, contact part; 211, first bending part; 212, second bending part; 213, flow guide groove; 220, fixed part; 221, mounting hole; 230, arc guide plate;

[0035] 300, static contact point;

[0036] 400, base. DETAILED DESCRIPTION

[0037] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description herein is for describing the specific embodiments only and not intended to limit the application.

[0039] The terms "comprise", "have" and any variations thereof in the specification and claims of the present application and the description of the drawings are intended to cover but not exclude other content. The word "one" or "an" does not exclude the presence of more than one.

[0040] Reference herein to "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The phrase "embodiment" appearing at various locations in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0041] The term "and / or" herein is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after it.

[0042] The positional words appearing in the following description are the directions shown in the drawings, and are not intended to limit the specific structure of the present application. For example, in the description of the present application, the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only intended to facilitate the description of the present application and simplify the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0043] In addition, the terms "first", "second", and the like in the description and claims of the present application or the above drawings are used to distinguish different objects, and are not intended to describe a particular order, and can explicitly or implicitly include one or more of the features.

[0044] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, the "connection" or "connection" of mechanical structure can mean physical connection, for example, the physical connection can be fixed connection, for example, fixed connection by fixing member, for example, fixed connection by screw, bolt or other fixing member; the physical connection can also be detachable connection, for example, mutual clamping or clamping connection; the physical connection can also be integrally connected, for example, welding, bonding or integrally formed connection for connection. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0045] In order for those skilled in the art to better understand the scheme of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the drawings.

[0046] Figure 1 The structure schematic diagram of the contact system provided by the embodiment of the present application is mounted in the base. Figure 2 The cross-sectional view of the contact system provided by the embodiment of the present application is mounted in the base. As Figure 1 And Figure 2 As shown in the drawings, the present application provides a circuit breaker, which comprises a base 400 and a contact system. The contact system is mounted in the base 400.

[0047] The circuit breaker is a switching device capable of closing, carrying and opening the current under normal circuit conditions, and capable of closing, carrying and opening the current under abnormal circuit conditions within a specified time. The circuit breaker can automatically cut off the circuit when the line has an overload and a short circuit fault.

[0048] The circuit breaker comprises a shell, a contact system, an arc extinguishing system, etc. The shell comprises a top cover and a base 400, the base 400 is internally provided with a mounting space, the arc extinguishing system and the contact system are both mounted in the mounting space inside the base 400, and the top cover can be covered on the base 400 to protect the arc extinguishing system and the contact system.

[0049] The contact system comprises a moving contact 100 and a stationary contact 200, etc. When the moving contact 100 and the stationary contact 200 are in contact, the loop is conducted. When an overload or a short circuit fault occurs in the loop, the moving contact 100 and the stationary contact 200 are separated, the circuit breaker will cut off the current in the loop, and an arc will be generated between the moving contact point 110 and the stationary contact point 300 in the process of separation of the moving contact 100 and the stationary contact 200, and the generated arc will enter the arc extinguishing system for extinguishing.

[0050] In the following, the contact system mentioned in the embodiments of the present application will be described clearly and completely in combination with the drawings.

[0051] Figure 3 A structure diagram of the moving contact provided in the embodiments of the present application is shown. Figure 4 A structure diagram of the stationary contact provided in the embodiments of the present application is shown. Figures 2 to 4 As shown in the drawings, the present application provides a contact system applied to a circuit breaker, the circuit breaker comprises a contact support, and the contact system comprises a moving contact 100, a stationary contact 200 and a stationary contact point 300. The moving contact 100 is rotationally connected to the contact support, and the moving contact 100 comprises a moving contact point 110. The stationary contact 200 is arranged on one side of the moving contact 100, and the stationary contact 200 comprises a contact portion 210, the contact portion 210 is provided with a first bending portion 211 at one end close to the moving contact 100, and the first bending portion 211 is bent away from the moving contact 100. The stationary contact point 300 is arranged on the side of the contact portion 210 facing the moving contact 100, and the moving contact 100 can be rotated to make the moving contact point 110 contact or separate from the stationary contact point 300.

[0052] The moving contact 100 can be in a long strip plate shape, and the moving contact 100 comprises a moving contact rod 120. The moving contact rod 120 comprises a first end 121 and a second end 122 opposite to each other. The first end 121 is rotationally connected to the contact support, and the contact support can drive the moving contact rod 120 to rotate with the first end 121 as the center. The moving contact point 110 is arranged on the second end 122, so that the moving contact point 110 can contact the stationary contact point 300.

[0053] When the circuit breaker is in a closing or opening state, the moving contact 100 is in a stationary state. When the circuit breaker is in the process of closing or opening, the contact support will rotate in the circuit breaker, thereby driving the moving contact 100 to rotate in the circuit breaker, and the moving contact point 110 will rotate with the moving contact 100 in the process of rotation of the moving contact 100.

[0054] The static contact 200 is usually used in cooperation with the moving contact 100. The arc extinguishing system comprises an arc extinguishing chamber, which is arranged on the side of the static contact 200 away from the moving contact 100, and part of the static contact 200 is located in the arc extinguishing chamber. Since the moving contact 100 and the static contact 200 are usually made of conductive materials, during the breaking process of the circuit breaker, an arc will be generated between the moving contact 100 and the static contact 200. The generated arc can enter the arc extinguishing chamber for extinguishing.

[0055] The static contact 200 can be in a strip shape, and the part of the static contact 200 close to the moving contact 100 can be a contact portion 210. The static contact point 300 can be arranged at the middle of the contact portion 210, and the static contact point 300 can be arranged on the side facing the moving contact 100, so that during the rotation of the moving contact 100, the moving contact point 110 can rotate together with the moving contact 100 to achieve the purpose of contacting or separating from the static contact point 300.

[0056] The first bending portion 211 can be arranged on the contact portion 210 at the end closest to the moving contact 100, and the static contact point 300 is closer to the arc extinguishing chamber than the first bending portion 211. When the circuit breaker is in the state shown in FIG. 1, the moving contact 100 can be located above the static contact 200, at this time, the first bending portion 211 is bent away from the moving contact 100, that is, the first bending portion 211 is bent towards the lower side, so that the distance between the first bending portion 211 and the moving contact 100 can be increased. Figure 2

[0057] In summary, the first bending portion 211 is arranged at the end of the contact portion 210 close to the moving contact 100, and the first bending portion 211 is bent away from the moving contact 100, so that the distance between the first bending portion 211 and the moving contact 100 can be increased. The arc will transfer from the two conductive parts with a larger distance to the two conductive parts with a smaller distance, through the above arrangement, the possibility of the arc generated between the moving contact point 110 and the static contact point 300 during the breaking process of the circuit breaker transferring to the first bending portion 211 and the moving contact 100 can be reduced, the arc is facilitated to transfer in the direction of the arc extinguishing chamber, so that the time of the arc entering the arc extinguishing chamber can be reduced, and the arc extinguishing effect of the circuit breaker is improved.

[0058] Since the application can reduce the time of the arc entering the arc extinguishing chamber, compared with the prior art, the time of the arc stagnating between the moving contact 100 and the static contact 200 will be reduced. Moreover, the application can reduce the time of the arc stagnating between the moving contact 100 and the static contact 200 by improving the structure of the static contact 200 as above, so it is not necessary to arrange a static cover at the end of the static contact 200 close to the moving contact 100. In this way, the use of the static cover can be reduced, and the production cost of the circuit breaker is saved.​

[0059] Please continue to refer to Figures 2 to 4 As shown in the figure, the bending angle of the first bending part 211 is greater than or equal to 0°, and the bending angle of the first bending part 211 is less than or equal to 90°.

[0060] The bending angle of the first bending part 211 can be the angle of the first bending part 211 bent relative to the static contact 300. The bending angle of the first bending part 211 can be 1°, 23°, 65°, or 90°, etc. The greater the bending angle of the first bending part 211, the farther the distance between the first bending part 211 and the moving contact 100, so that it is more difficult for the arc to transfer from between the moving contact 110 and the static contact 300 to between the first bending part 211 and the moving contact 100.

[0061] When the bending angle of the first bending part 211 is less than 0°, the first bending part 211 will be bent towards the moving contact 100, which will reduce the distance between the first bending part 211 and the moving contact 100, thereby making it easier for the arc to transfer from between the moving contact 110 and the static contact 300 to between the first bending part 211 and the moving contact 100, which will increase the arc stagnation time between the moving contact 100 and the static contact 200, which is not conducive to the arc to be extinguished quickly.

[0062] When the bending angle of the first bending part 211 is greater than 90°, the first bending part 211 will be bent towards the side of the contact part 210 away from the moving contact 100, which will cause the end of the first bending part 211 not connected to the contact part 210 to be close to the contact part 210, thereby causing the static contact 200 to possibly have a short circuit problem, affecting the use of the contact system.

[0063] In summary, the bending angle of the first bending part 211 can be flexibly selected according to the actual setting, which can improve the application range of the static contact 200 mentioned in the application, so that the static contact 200 mentioned in the application can be applied to most circuit breakers, which can reduce the production cost of the circuit breaker.

[0064] Please continue to refer to Figures 2 to 4 As shown in the figure, the shortest distance from the static contact 300 to the moving contact 110 is less than the distance from the first bending part 211 to the moving contact rod 120.

[0065] When the circuit breaker is in the process of opening, the shortest distance from the static contact 300 to the moving contact 110 can always be less than the distance from the first bending part 211 to the moving contact rod 120.

[0066] Through the above arrangement, the first end 121 is rotatably connected with the contact support, and the movable contact 110 is arranged at the second end 122, so that the movable contact 100 can drive the movable contact 110 to contact or separate from the stationary contact 300 in the process of rotation. When the shortest distance from the stationary contact 300 to the movable contact 110 is less than the distance from the first bending part 211 to the movable contact lever 120, the possibility of the arc generated between the movable contact 110 and the stationary contact 300 transferring to the first bending part 211 and the movable contact 100 can be reduced, so that the use of the stationary shield can be reduced, thereby saving the production cost of the circuit breaker.

[0067] As shown in Figure 2 and Figure 4 , the contact part 210 is provided with a second bending part 212 at the end away from the movable contact 100, and the stationary contact 200 comprises a fixed part 220. The second bending part 212 is opposite to the first bending part 211 in position, and the second bending part 212 is bent towards the movable contact 100. The fixed part 220 is connected to the end of the second bending part 212 away from the first bending part 211.

[0068] The fixed part 220 is used to fix the stationary contact 200 arranged in the base 400 of the circuit breaker. The fixed part 220 is connected in the circuit, and when the circuit breaker is in the closed state, the current in the circuit flows through the fixed part 220, then flows to the contact part 210 through the second bending part 212, and then the current flowing to the contact part 210 flows to the movable contact 110 through the stationary contact 300, and finally flows into the movable contact 100.

[0069] The base 400 of the circuit breaker is provided with a mounting table, and the mounting height of the mounting table is higher than the mounting height of the contact part 210. At this time, the second bending part 212 can be arranged at the end of the contact part 210 away from the movable contact 100. By bending the second bending part 212 towards the movable contact 100, the end of the contact part 210 away from the movable contact 100 can be connected to the fixed part 220 through the second bending part 212.

[0070] The fixed part 220 can be provided with a mounting hole 221, and the mounting hole 221 can be a circular through hole with smooth inner wall. The mounting table in the base 400 can be provided with a positioning hole, and the positioning hole can be opposite to the mounting hole 221 in position, and the inner wall of the positioning hole can be provided with a thread.

[0071] When the static contact 200 is installed in the circuit breaker, the fixed part 220 can be placed on the installation table first, and the contact part 210 is opposite to the moving contact 100, then the installation hole 221 is opposite to the positioning hole, and then the bolt is screwed through the installation hole 221 and screwed with the positioning hole. When installing the static contact 200, a hole gasket can be placed on the side of the fixed part 220 away from the installation table, the hole on the gasket is opposite to the installation hole 221, and then the bolt is installed, which can increase the stability after the bolt is installed, thereby increasing the stability of the static contact 200 during installation.

[0072] When the installation hole 221 is a circular through hole, the shape of the installation hole 221 can be more suitable for the shape of the bolt, reducing the installation difficulty of the static contact 200, and when the shape of the installation hole 221 is suitable for the bolt, the installation of the bolt is more stable, reducing the possibility of the static contact 200 falling from the circuit breaker due to loose bolts, and improving the use reliability of the contact system.

[0073] In summary, the fixed part 220 can be installed in the circuit breaker, and the second bending part is provided to make the fixed part 220 more suitable for the installation environment in the base 400 after being connected with the contact part 210, reducing the installation difficulty of the static contact 200 during installation in the circuit breaker. And the bending angle of the second bending part 212 can also be selected according to the actual use requirement, so that the application range of the static contact 200 is wider, so that the static contact 200 mentioned in the application can be selected when using different models of circuit breakers, thereby saving the use of static cover when using the circuit breaker, so as to save the production cost of the circuit breaker.

[0074] Figure 5 The structure schematic diagram of the static contact provided by the embodiment of the application is installed on the static contact. As shown in Figures 3 to 5 The contact part 210 is provided with a flow guide groove 213, and the flow guide groove 213 penetrates the contact part 210. The flow guide groove 213 is arranged around the static contact 300.

[0075] The static contact 200 is long strip-shaped, and the flow guide groove 213 can be a through groove penetrating the contact part 210 in the thickness direction of the contact part 210.

[0076] Through the above arrangement, the flow guide groove 213 penetrates the contact portion 210 and is arranged around the static contact point 300, so that the current cannot flow in a straight line when passing through the fixed portion 220 to the contact portion 210 and flowing through the static contact point 300, but will detour the flow guide groove 213 to reach the static contact point 300, thereby realizing the current diversion at the contact portion 210, so as to provide the electric repulsion by the current commutation, so as to accelerate the separation of the moving contact 100 and the static contact 200 when the short circuit occurs in the loop, thereby ensuring that the moving contact 100 and the static contact 200 have sufficient electric repulsion when separated.

[0077] Please continue to refer to Figures 3 to 5 As shown in

[0078] The closed end of the U-shaped groove can be located on the second bending portion 212, and the open end of the U-shaped groove can be located on the first bending portion 211, so that the length of the U-shaped groove can be increased, thereby increasing the length of the current flowing, and further increasing the electric repulsion provided by the current commutation, so as to ensure that the moving contact 100 and the static contact 200 have sufficient electric repulsion when separated.

[0079] Through the above arrangement, the U-shaped flow guide groove 213 can make the static contact 200 mentioned in the present application have the effect of the U-shaped static contact 200 in the prior art, thereby achieving the effect of changing the flow direction of the current in the static contact 200. It is not necessary to change the structure of the static contact 200 to achieve the effect of changing the flow direction of the current in the static contact 200, so that the manufacturing cost of the static contact 200 can be saved. Moreover, the structure of the U-shaped flow guide groove 213 is relatively simple, and the setting cost is relatively low, thereby further saving the manufacturing cost of the static contact 200.

[0080] Figure 6 A schematic view of the relative position of the moving contact and the static contact of the circuit breaker in the open state is provided for the embodiments of the present application.

[0081] As shown in Figure 3 , Figure 4 and Figure 6 The static contact 200 further includes an arc striking plate 230, and the arc striking plate 230 is arranged on the contact portion 210. The arc striking plate 230 is arranged close to the static contact point 300, and the arc striking plate 230 is bent towards the direction close to the moving contact 100.

[0082] The arc striking plate 230 can be a plate-shaped structure arranged on the static contact 200, the arc striking plate 230 is connected to the contact portion 210, and the arc striking plate 230 is in conduction with the static contact point 300. In order to Figure 6The relative position of the moving contact 100 and the static contact 200 is that the arc striking plate 230 is bent towards the moving contact 110. The application does not limit the setting angle of the arc striking plate 230, and the bending angle of the arc striking plate 230 can be set according to actual use requirements.

[0083] Through the above setting, during the breaking process of the circuit breaker, an arc is generated between the moving contact 100 and the static contact 200, and the arc striking plate 230 can attract the arc, so that the arc is more easily entered into the arc extinguishing system. The arc striking plate 230 is arranged close to the static contact 300 and is bent towards the moving contact 100, and the arc generated when the moving contact 100 and the static contact 200 are separated will move along the arc striking plate 230 to the end of the arc striking plate 230, which can further increase the speed of the arc entering into the arc extinguishing system, thereby improving the breaking performance of the circuit breaker.

[0084] In some possible embodiments, the contact system further comprises a magnetic increasing member. The magnetic increasing member is opposite to the static contact 300, and the magnetic increasing member is arranged on the side of the contact part 210 away from the static contact 300.

[0085] The magnetic increasing member can be made of a magnetic material, for example, the magnetic increasing member can be made of iron, nickel, cobalt or the like.

[0086] In summary, by arranging the magnetic increasing member in the contact system, at the moment when the moving contact 100 and the static contact 200 are separated, the magnetic increasing member can generate a magnetic field under the action of the current, and the generated magnetic field can increase the electrodynamic repulsion force applied by the static contact 300 to the moving contact 110, so that the moving contact 100 can be quickly separated from the static contact 200. During the process of quickly separating the moving contact 100 and the static contact 200, the arc between the moving contact 100 and the static contact 200 will be quickly elongated, and the elongated arc can more easily enter into the arc extinguishing system for extinguishing. In this way, the arc extinguishing effect of the circuit breaker can be improved.

Claims

1. A contact system for application to a circuit breaker, the circuit breaker comprising a contact support, characterized in that, The contact system comprises: a moving contact rotatably connected to the contact support, the moving contact comprising a moving contact point; a stationary contact disposed on one side of the moving contact, the stationary contact comprising a contact portion, the contact portion being provided with a first bent portion at an end thereof close to the moving contact, the first bent portion being bent away from the moving contact; a stationary contact point disposed on a side of the contact portion facing the moving contact, the moving contact being rotatable to make the moving contact point contact or separate from the stationary contact point.

2. The contact system of claim 1, wherein, The first bent portion has a bending angle greater than or equal to 0° and less than or equal to 90°.

3. The contact system of claim 1, wherein, The moving contact comprises a moving contact rod; The moving contact rod comprises a first end and a second end opposite to each other, the first end being rotatably connected to the contact support, and the moving contact point being disposed on the second end; The shortest distance from the stationary contact point to the moving contact point is less than the distance from the first bent portion to the moving contact rod.

4. The contact system of claim 1, wherein, The contact portion is provided with a second bent portion at an end thereof away from the moving contact, and the stationary contact comprises a fixed portion; The second bent portion is opposite to the first bent portion, and the second bent portion is bent towards the moving contact; The fixed portion is connected to an end of the second bent portion away from the first bent portion.

5. The contact system of claim 4, wherein, The fixed portion is provided with a mounting hole, and the mounting hole is a circular through hole.

6. The contact system of claim 5, wherein, The contact portion is provided with a flow guide groove, and the flow guide groove penetrates through the contact portion; The flow guide groove is disposed around the stationary contact point.

7. The contact system of claim 6, wherein, The flow guide groove is a U-shaped groove, and the stationary contact point is disposed close to an open end of the U-shaped groove.

8. The contact system of claim 7, wherein, The stationary contact further comprises an arc striking plate, and the arc striking plate is disposed on the contact portion; The arc striking plate is disposed close to the stationary contact point, and the arc striking plate is bent towards the direction close to the moving contact.

9. The contact system of claim 1, wherein, The contact system further comprises a magnetic enhancer; The magnetic enhancer is opposite to the stationary contact point, and the magnetic enhancer is disposed on a side of the contact portion away from the stationary contact point.

10. A circuit breaker characterized by, The contact system comprises a base and the contact system according to any one of claims 1 to 9; The contact system is mounted in the base.

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