Contact system and circuit breaker

Abstract

The embodiment of the utility model provides a contact system and a circuit breaker, and relates to the technical field of electrical equipment. The contact system comprises a static contact assembly and a moving contact assembly. The static contact assembly comprises a static busbar and a static silver point, the first side of the static busbar comprises a first surface and a second surface, the second surface sinks on the first surface, and the static silver point is arranged on the second surface; the moving contact assembly comprises a moving contact piece and a moving silver point, the moving silver point is arranged on the side, close to the static contact assembly, of the moving contact piece, and the moving contact piece swings to drive the moving silver point to make contact with the static silver point from the upper portion. As the second surface sinks on the first surface, the distance between the static silver point and the movable silver point is increased under the condition that the mounting position of the static busbar is not changed, which is equivalent to that the opening distance between the movable silver point and the static silver point is increased when the circuit breaker is switched off, so that the breaking capacity of the circuit breaker is improved, and meanwhile, the service life of the circuit breaker is prolonged. The electric arc generated when the circuit breaker is opened is pulled longer, and the electric arc is easier to extinguish, namely the arc extinguishing capability of the circuit breaker is improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of electrical equipment, and in particular, to a contact system and a circuit breaker. Background Art

[0002] Circuit breakers are an important part of power distribution equipment and are mainly used in various power systems to connect and disconnect currents in power grid circuits and protect lines and power equipment from hazards such as overload, undervoltage, short circuit, single-phase grounding and other faults.

[0003] The contact system of a circuit breaker generally includes a static contact assembly and a moving contact assembly. The moving contact assembly can be movably arranged, and the static contact assembly is arranged on the moving path of the moving contact assembly. Within the moving range of the moving contact assembly, the moving contact assembly can contact or separate from the static contact assembly to realize the closing and opening of the circuit breaker.

[0004] However, due to the limitation of the space inside the circuit breaker housing, the maximum spacing between the contact parts of the static contact assembly and the moving contact assembly is often not large enough, resulting in certain limitations on the circuit breaker's breaking capacity, arc extinguishing capacity and usage scenarios. Utility Model Content

[0005] In view of the above problems, the embodiments of the present application provide a contact system and a circuit breaker, which can increase the opening distance between the moving silver point and the static silver point in a limited space, thereby improving the arc extinguishing ability and breaking capacity of the circuit breaker.

[0006] According to one aspect of an embodiment of the present application, a contact system is provided, which includes a static contact assembly and a moving contact assembly; the static contact assembly includes a static busbar and a static silver point, the first side of the static busbar includes a first surface and a second surface, the second surface is sunken under the first surface, and the static silver point is arranged on the second surface; the moving contact assembly includes a moving contact piece and a moving silver point, the moving silver point is arranged on a side of the moving contact piece close to the static contact assembly, and the swing of the moving contact piece can drive the moving silver point to contact the static silver point from above.

[0007] By adopting the above scheme, since the second surface is sunken into the first surface, when the installation position of the static busbar remains unchanged, the distance between the static silver point and the moving silver point increases, which is equivalent to that when the circuit breaker is opened, the opening distance between the moving silver point and the static silver point increases, thereby improving the breaking capacity of the circuit breaker. At the same time, the arc generated when the circuit breaker is opened is pulled longer and the arc is easier to extinguish, that is, the arc extinguishing capacity of the circuit breaker is improved.

[0008] In some embodiments, the stationary contact assembly further includes an arc-starting plate, one end of which is connected to the second surface and to a side of the stationary silver point away from the moving contact assembly, the other end of the arc-starting plate extends away from the moving contact piece, and there is a gap between the arc-starting plate and the first surface.

[0009] By adopting the above solution, the arc on the static silver point can be transferred to the end of the arc-starting plate connected to the second surface, and transferred along the arc-starting plate in a direction away from the moving contact piece. Usually in a circuit breaker, the arc extinguishing chamber is arranged on the side of the arc-starting plate away from the moving contact piece. Therefore, the arrangement of the arc-starting plate is conducive to guiding the arc generated between the moving silver point and the static silver point to the arc extinguishing chamber, which is conducive to quickly extinguishing the arc.

[0010] In some embodiments, the edge of the upper surface of the static silver point close to the arc starting plate is higher than the edge of the upper surface of the arc starting plate close to the static silver point, or the edge of the upper surface of the static silver point close to the arc starting plate is the same height as the edge of the upper surface of the arc starting plate close to the static silver point.

[0011] By adopting the above solution, the arc is more easily transferred from the static silver point to the arc starting plate, which is conducive to the rapid extinction of the arc.

[0012] In some embodiments, a silver dot mounting platform is protruded from the second surface, and the static silver dot is arranged on the silver dot mounting platform; an angle is formed between the upper surface of the silver dot mounting platform and the second surface, and the opening of the angle faces the first surface.

[0013] By adopting the above scheme, the setting of the silver point mounting platform makes it possible that even if the thickness of the static silver point is relatively thin, the edge of the upper surface of the static silver point close to the arc-starting plate can be higher than the edge of the upper surface of the arc-starting plate close to the static silver point or be equal to the edge of the upper surface of the arc-starting plate close to the static silver point, so that the arc is more easily transferred from the static silver point to the arc-starting plate, which is conducive to the rapid extinction of the arc. In addition, the setting of the angle makes the upper surface of the silver point mounting platform slightly face the moving contact assembly. After the static silver point is installed on the upper surface of the silver point mounting platform, in the closed state, the upper surface of the static silver point can be in a state of facing or substantially facing the moving silver point, increasing the effective contact area between the static silver point and the moving silver point, and reducing the contact resistance between the static silver point and the moving silver point.

[0014] In some embodiments, the stationary contact assembly further includes an insulating backing plate, which is located in the gap between the arc-starting plate and the first surface.

[0015] By adopting the above scheme, the setting of the pad prevents the arc-striking plate and the static busbar from being conductive at the first surface due to the small gap, resulting in poor breaking capacity of the contact system, so that the arc-striking plate and the static busbar can be conductive only at the second surface within a limited space, thereby improving the breaking capacity and arc extinguishing capacity of the circuit breaker.

[0016] In some embodiments, the projection of the backing plate on the first surface completely covers the projection of the arc-starting plate on the first surface.

[0017] By adopting the above solution, the electrical gap between the arc-striking plate and the static busbar at the first surface is increased, thereby preventing the arc-striking plate from being electrically connected to the static busbar at the first surface.

[0018] In some embodiments, the static contact assembly also includes a sleeve member and a fastener, the sleeve member is an insulating member, a first mounting hole is provided on the static busbar, a second mounting hole is provided on the pad, a third mounting hole is provided on the arc-starting plate, the sleeve member is installed in the first mounting hole, and the fastener passes through the inner hole of the sleeve member and the second mounting hole and then is connected to the third mounting hole.

[0019] By adopting the above scheme, the fasteners can fix the static busbar, the pad and the arc-striking plate, and the sleeve can achieve insulation isolation between the fasteners and the static busbar, ensuring that the static busbar and the arc-striking plate will not be conductive due to the fasteners, thereby ensuring the breaking capacity of the contact system and the arc extinguishing capacity of the circuit breaker.

[0020] In some embodiments, there are multiple moving contact pieces, which are divided into a first moving contact piece and a second moving contact piece, and the angle between the first moving contact piece and the upper surface of the static silver point is greater than the angle between the second moving contact piece and the upper surface of the static silver point.

[0021] By adopting the above scheme, in the process of multiple moving contact pieces driving the moving silver point to contact with the static silver point by swinging, the moving silver point on the second moving contact piece contacts with the static silver point first, and the moving silver point on the first moving contact piece contacts with the static silver point later, and in the process of multiple moving contact pieces driving the moving silver point to separate from the static silver point by swinging, the moving silver point on the first moving contact piece separates from the static silver point first, and the moving silver point on the second moving contact piece separates from the static silver point later. In the above process, the arc is more likely to be concentrated between the moving silver point and the static silver point on the second moving contact piece, so that the arc is more likely to be extinguished.

[0022] In some embodiments, the number of the second moving contact pieces is one or more.

[0023] By adopting the above scheme, the number of the second moving contact pieces can be adjusted according to the current size when the contact system of the circuit breaker is closed. When the current is large, the number of the second moving contact pieces is increased, and when the current is small, the number of the second moving contact pieces is reduced, thereby changing the concentration of the arc and preventing the problem that the current after the arc is concentrated is too large and difficult to extinguish.

[0024] According to another aspect of an embodiment of the present application, a circuit breaker is provided, comprising the contact system in any one of the above embodiments.

[0025] The contact system of the embodiment of the present application divides the first side of the static busbar into a first surface and a second surface, the second surface is sunken under the first surface, and the static silver point is located on the second surface, so that when the installation position of the static busbar remains unchanged, the distance between the static silver point and the moving silver point is increased, which is equivalent to that when the circuit breaker is opened, the opening distance between the moving silver point and the static silver point is increased, thereby improving the breaking capacity of the circuit breaker, and the arc generated when the circuit breaker is opened is pulled longer, and the arc is easier to extinguish, that is, the arc extinguishing capacity of the circuit breaker is improved.

[0026] The above description is only an overview of the technical solution of the embodiment of the present application. In order to more clearly understand the technical means of the embodiment of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the embodiment of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 Schematic diagram of the structure of the contact system in the embodiment of the present application.

[0029] Figure 2 It is a schematic structural diagram of a static contact assembly in an embodiment of the present application.

[0030] Figure 3 It is a schematic diagram of the structure of another static contact system in an embodiment of the present application.

[0031] Figure 4 It is a cross-sectional view of a moving contact assembly in an embodiment of the present application.

[0032] Figure 5 Schematic diagram of the internal structure of a circuit breaker in an embodiment of the present application.

[0033] Figure 6 for Figure 5 Schematic diagram of the cross-sectional structure of the AA surface in the middle.

[0034] Explanation of the reference numerals: 1000, contact system; 100, static contact assembly; 110, static busbar; 111, first surface; 112, second surface; 113, silver point mounting platform; 120, static silver point; 130, arc-starting plate; 140, pad; 150, first mounting hole; 160, second mounting hole; 170, third mounting hole; 180, sleeve member; 190, fastener; 200, moving contact assembly; 210, moving contact piece; 211, first moving contact piece; 212, second moving contact piece; 220, moving silver point; 230, contact bracket; 231, limit portion; 232, notch; 240, contact spring; 250, soft connection; 260, moving busbar; 300, base; 400, connecting rod; 500, rotating shaft; arc extinguishing chamber. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of the application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0037] The terms "comprising" and "having" and any variations thereof in the specification, claims and drawings of this application are intended to cover but not exclude other contents. The word "a" or "an" does not exclude the presence of a plurality.

[0038] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase "embodiments" in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0039] The term "and / or" in this article is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0040] The directional words appearing in the following description are all directions shown in the drawings, and do not limit the specific structure of the contact system or circuit breaker of the present application. For example, in the description of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present application.

[0041] In addition, the expressions of the indicated directions such as the X direction, the Y direction and the Z direction used to illustrate the operation and construction of the components of the contact system or the circuit breaker of the present embodiment are not absolute but relative, and although these indications are appropriate when the components of the contact system or the circuit breaker are in the positions shown in the figures, when these positions are changed, these directions should be interpreted differently to correspond to the changes.

[0042] In addition, the terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.

[0043] In the description of the present application, unless otherwise specified, "plurality" means more than two (including two), and similarly, "multiple groups" means more than two groups (including two).

[0044] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, the "connection" or "connection" of a mechanical structure can refer to a physical connection. For example, the physical connection can be a fixed connection, such as a fixed connection through a fixing member, such as a fixed connection through a screw, bolt or other fixing member; the physical connection can also be a detachable connection, such as a mutual snap connection or snap connection; the physical connection can also be an integral connection, such as welding, bonding or integral molding to form a connection for connection. The "connection" or "connection" of a circuit structure can refer to not only a physical connection, but also an electrical connection or a signal connection. For example, it can be a direct connection, that is, a physical connection, or it can be indirectly connected through at least one intermediate element, as long as the circuit is connected, and it can also be the internal connection of two elements; in addition to signal connection through a circuit, a signal connection can also refer to signal connection through a media medium, such as a radio wave. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0045] The embodiment of the present application provides a contact system 1000, such as Figure 1 As shown, the contact system 1000 includes a stationary contact assembly 100 and a movable contact assembly 200 .

[0046] like Figure 1 and Figure 2 As shown, the static contact assembly 100 includes a static busbar 110 and a static silver point 120 . The first side of the static busbar 110 includes a first surface 111 and a second surface 112 . The second surface 112 is sunken in the first surface 111 . The static silver point 120 is arranged on the second surface 112 .

[0047] like Figure 1As shown, the moving contact assembly 200 includes a moving contact piece 210 and a moving silver point 220. The moving silver point 220 is arranged on a side of the moving contact piece 210 close to the stationary contact assembly 100. The swing of the moving contact piece 210 can drive the moving silver point 220 to contact the stationary silver point 120 from above.

[0048] The first side of the static busbar 110 is the side of the static busbar 110 close to the moving silver point 220, that is, the side where the moving silver point 220 contacts the static silver point 120. The second surface 112 is sunken into the first surface 111, which means that the second surface 112 is farther from the moving silver point 220 than the first surface 111. This structure can be achieved by bending the static busbar 110, or by stamping the static busbar 110.

[0049] Both the static busbar 110 and the moving contact piece 210 may be made of a conductive metal plate, for example, a copper plate. Copper has good electrical conductivity and can improve the electrical performance of the contact system 1000 .

[0050] Taking the swing range of the moving contact piece 210 as an example, it is located above the static busbar 110. When the moving contact piece 210 swings downward, it can drive the moving silver point 220 to swing downward together and contact the static silver point 120 to achieve closing. When the moving contact piece 210 swings upward, it drives the moving silver point 220 upward together, so that the moving silver point 220 is separated from the static silver point 120 to achieve opening.

[0051] When the contact system 1000 is installed in the housing of the circuit breaker, since the first surface 111 does not need to contact the moving silver point 220, the contact system 1000 is generally fixed in the housing from the location of the first surface 111. When the installation position of the first surface 111 remains unchanged, when the second surface 112 sinks below the first surface 111, the distance between the static silver point 120 and the moving silver point 220 increases, which is equivalent to an increase in the opening distance between the moving silver point 220 and the static silver point 120 when the circuit breaker is opened, thereby improving the breaking capacity of the circuit breaker. At the same time, the arc generated when the circuit breaker is opened is pulled longer and the arc is easier to extinguish, that is, the arc extinguishing capacity of the circuit breaker is improved.

[0052] like Figure 1 and Figure 2 As shown, in some embodiments, the static contact assembly 100 further includes an arc-starting plate 130, one end of the arc-starting plate 130 is connected to the second surface 112, and is connected to the side of the static silver point 120 away from the moving contact assembly 200, and the other end of the arc-starting plate 130 extends in a direction away from the moving contact piece 210, and there is a gap between the arc-starting plate 130 and the first surface 111.

[0053] The arc-starting plate 130 may be made of cast iron or a silver-plated metal part, which is not limited in the embodiment of the present application.

[0054] The static silver point 120 is connected to the second surface 112, and one end of the arc-starting plate 130 is also connected to the second surface 112, so the arc on the static silver point 120 can be transferred to the end of the arc-starting plate 130 connected to the second surface 112, and transferred along the arc-starting plate 130 in a direction away from the moving contact piece 210. Usually in a circuit breaker, the arc extinguishing chamber is arranged on the side of the arc-starting plate 130 away from the moving contact piece 210, so the arrangement of the arc-starting plate 130 is conducive to guiding the arc generated between the moving silver point 220 and the static silver point 120 to the arc extinguishing chamber, which is conducive to quickly extinguishing the arc.

[0055] There is a gap between the arc-striking plate 130 and the first surface 111, so that the arc-striking plate 130 and the static busbar 110 are electrically connected only at the second surface 112. When the arc is transferred to the arc-striking plate 130, the arc will be transferred to the arc extinguishing chamber along the arc-striking plate 130, but will not be transferred to the static busbar 110, so that the static busbar 110 and the moving contact piece 210 will not continue to be conductive. It can be seen that the above-mentioned setting relationship between the arc-striking plate 130 and the static busbar 110 enables the moving contact assembly 200 to have the above-mentioned arc-striking function while ensuring that the contact system 1000 maintains a good breaking capacity.

[0056] The size of the gap between the arc-starting plate 130 and the first surface 111 may vary according to the current size of the main circuit of the circuit breaker. For example, if the current of the main circuit of the circuit breaker is large, the gap between the arc-starting plate 130 and the first surface 111 is large, and if the current of the main circuit of the circuit breaker is small, the gap between the arc-starting plate 130 and the first surface 111 is small. It is sufficient to avoid the arc-starting plate 130 and the static busbar 110 being conductive at the first surface 111.

[0057] Alternatively, if Figure 3 As shown, in order to better prevent the arc-striking plate 130 from being electrically connected to the stationary busbar 110 at a position corresponding to the first surface 111 , the stationary contact assembly 100 further includes an insulating pad 140 , which is located in the gap between the arc-striking plate 130 and the first surface 111 .

[0058] When the pad 140 is provided, even if the gap between the arc-striking plate 130 and the first surface 111 is small, as long as the arc current cannot break through the pad 140 , the pad 140 can insulate the arc-striking plate 130 from the portion of the static busbar 110 corresponding to the first surface 111 .

[0059] It can be seen that by adopting the above-mentioned scheme, the setting of the pad 140 prevents the arc-striking plate 130 and the static busbar 110 from being conductive at the first surface 111 due to the small gap, resulting in the problem of poor breaking capacity of the contact system 1000, so that the arc-striking plate 130 and the static busbar 110 can be conductive only at the second surface 112 within a limited space, thereby improving the breaking capacity and arc extinguishing capacity of the circuit breaker.

[0060] The material of the pad 140 can be various insulating materials.

[0061] Optionally, the backing plate 140 is made of a high-temperature resistant insulating material to ensure that the backing plate 140 is not easily deformed or melted in a high-temperature environment when an arc is generated.

[0062] In some embodiments, the material of the backing plate 140 is a high-temperature gas-generating material, so that the backing plate 140 generates gas in a high-temperature environment when an arc is generated, increasing the pressure difference between the static busbar 110 and the arc extinguishing chamber, thereby pushing the arc to transfer to the arc extinguishing chamber, achieving the effect of gas blowing arc extinguishing. Exemplarily, the gas-generating material can be PA66 nylon material.

[0063] like Figure 3 As shown, in some embodiments, the projection of the backing plate 140 on the first surface 111 completely covers the projection of the arc-starting plate 130 on the first surface 111 .

[0064] When the arc passes through the surface of the arc-striking plate 130 , the metal particles carried will not fall directly on the first surface 111 , but on the pad 140 , thereby reducing the possibility of conduction between the arc-striking plate 130 and the static busbar 110 at the corresponding position of the first surface 111 .

[0065] In addition, when the arc passes through the surface of the arc-striking plate 130, if the arc-striking plate 130 wants to be conductive with the portion of the static busbar 110 corresponding to the first surface 111, the current on the arc-striking plate 130 needs to bypass the edge of the pad 140. Therefore, the projection of the pad 140 on the first surface 111 completely covers the projection of the arc-striking plate 130 on the first surface 111, which is equivalent to increasing the creepage distance of the arc-striking plate 130 at the position corresponding to the first surface 111 of the static busbar 110, and further reducing the possibility of conductive connection between the arc-striking plate 130 and the static busbar 110 at the corresponding portion of the first surface 111.

[0066] like Figure 1 As shown, in some embodiments, the edge of the upper surface of the static silver point 120 close to the arc-starting plate 130 is higher than the edge of the upper surface of the arc-starting plate 130 close to the static silver point 120, or the edge of the upper surface of the static silver point 120 close to the arc-starting plate 130 is at the same height as the edge of the upper surface of the arc-starting plate 130 close to the static silver point 120.

[0067] The upper surface of the static silver point 120 refers to the surface of the static silver point 120 away from the second surface 112 , and the upper surface of the arc-starting plate 130 refers to the surface of the arc-starting plate 130 away from the second surface 112 .

[0068] In the above embodiments, the height of the upper surface of the static silver point 120 close to the edge of the arc-starting plate 130 and the height of the upper surface of the arc-starting plate 130 close to the edge of the static silver point 120 are both measured with the second surface 112 as the reference plane.

[0069] It can be understood that the height limit between the edges in the above structure does not mean that the parts other than the edges also meet the above structural limit. For example, the edge of the upper surface of the static silver point 120 close to the arc-starting plate 130 is higher than the edge of the upper surface of the arc-starting plate 130 close to the static silver point 120, but the part of the upper surface of the static silver point 120 located outside the above edges may also be lower than the edge of the upper surface of the arc-starting plate 130 close to the static silver point 120.

[0070] In addition, it should be noted that the height of the upper surface of the static silver point 120 close to the edge of the arc-starting plate 130 is not equal to the thickness of the static silver point 120. For example, the thickness of the static silver point 120 is 1 mm (millimeter), but the height of the upper surface of the static silver point 120 close to the edge of the arc-starting plate 130 is 2 mm.

[0071] The above arrangement makes it possible for the arc on the upper surface of the static silver point 120 to transfer to the arc striking plate 130 without "climbing", so that the arc can be more easily transferred from the static silver point 120 to the arc striking plate 130, and then transferred to the arc extinguishing chamber along the arc striking plate 130, which is conducive to the rapid extinction of the arc.

[0072] like Figure 2 and Figure 3 As shown, in some embodiments, the second surface 112 is protrudingly provided with a silver dot mounting platform 113, and the static silver dot 120 is disposed on the silver dot mounting platform 113; an angle is formed between the upper surface of the silver dot mounting platform 113 and the second surface 112, and the opening of the angle faces the first surface 111.

[0073] The static silver point 120 is usually made by a mold, has a uniform thickness, and is often thinner than the arc starting plate 130 .

[0074] The arrangement of the silver point mounting platform 113 ensures that even if the thickness of the static silver point 120 is relatively thin, the edge of the upper surface of the static silver point 120 close to the arc-starting plate 130 can be higher than the edge of the upper surface of the arc-starting plate 130 close to the static silver point 120 or be at the same height as the edge of the upper surface of the arc-starting plate 130 close to the static silver point 120, thereby making it easier for the arc to transfer from the static silver point 120 to the arc-starting plate 130, which is beneficial to the rapid extinction of the arc.

[0075] In addition, the angle between the upper surface of the silver point mounting platform 113 and the second surface 112 is set so that the upper surface of the silver point mounting platform 113 is slightly toward the moving contact assembly 200. When the static silver point 120 is installed on the upper surface of the silver point mounting platform 113, in the closed state, the upper surface of the static silver point 120 can be in a directly facing state or a substantially directly facing state with the moving silver point 220, thereby increasing the effective contact area between the static silver point 120 and the moving silver point 220 and reducing the contact resistance between the static silver point 120 and the moving silver point 220.

[0076] In the above structure, the angle between the upper surface of the silver dot mounting platform 113 and the second surface 112 is between 0-60°. If the angle is too large, the upper surface of the static silver dot 120 and the dynamic silver dot 220 cannot be directly opposite or substantially directly opposite in the contact state, making it difficult to effectively contact.

[0077] Optionally, the angle between the upper surface of the silver dot mounting platform 113 and the second surface 112 is between 1° and 30°, at which angle, the static silver dot 120 and the dynamic silver dot 220 have a larger contact area.

[0078] like Figure 3 As shown, in some embodiments, the static contact assembly 100 also includes a sleeve member 180 and a fastener 190, a first mounting hole 150 is provided on the static busbar 110, a second mounting hole 160 is provided on the backing plate 140, a third mounting hole 170 is provided on the arc-starting plate 130, the sleeve member 180 is installed in the first mounting hole 150, and the fastener 190 passes through the inner hole of the sleeve member 180 and the second mounting hole 160 and then is connected to the third mounting hole 170.

[0079] The fastener 190 is used to connect the static busbar 110, the backing plate 140 and the arc-starting plate 130. The fastener 190 is generally a metal part. Exemplarily, the fastener 190 is a screw.

[0080] The sleeve member 180 is an insulating member, and part or all of the sleeve member 180 is a cylindrical structure. The sleeve member 180 is installed in the first mounting hole 150, thereby isolating the fastener 190 from the side wall of the first mounting hole 150, preventing the arc-starting plate 130 and the static busbar 110 from being connected through the fastener 190.

[0081] Optionally, one end of the sleeve member 180 close to the backing plate 140 abuts against the backing plate 140 , or extends into the second mounting hole 160 to completely isolate the fastener 190 from the side wall of the first mounting hole 150 .

[0082] By adopting the above scheme, the fastener 190 connects the static busbar 110, the pad 140 and the arc-striking plate 130 together, thereby realizing the fixation of the static busbar 110, the pad 140 and the arc-striking plate 130. The sleeve member 180 can realize the insulation isolation between the fastener 190 and the static busbar 110, thereby ensuring that the static busbar 110 and the arc-striking plate 130 will not be conductive due to the fastener 190, thereby ensuring the breaking capacity of the contact system 1000 and the arc extinguishing capacity of the circuit breaker.

[0083] like Figure 1 and Figure 4As shown, in some embodiments, a plurality of moving contact pieces 210 are provided, and the plurality of moving contact pieces 210 are divided into a first moving contact piece 211 and a second moving contact piece 212, and an angle between the first moving contact piece 211 and the upper surface of the static silver point 120 is greater than an angle between the second moving contact piece 212 and the upper surface of the static silver point 120.

[0084] A moving silver point 220 is disposed on one side of each moving contact piece 210 close to the static silver point 120 , and the plurality of moving silver points 220 can all contact with the static silver point 120 .

[0085] Exemplarily, the static busbar 110 is set wider, and the static silver point 120 is also set wider. In this way, the moving silver points 220 on multiple moving contact pieces 210 arranged side by side can all contact with the static silver point 120 when the switch is closed, thereby achieving circuit conduction.

[0086] In the process of the plurality of movable contact pieces 210 swinging to drive the movable silver point 220 to contact the static silver point 120, the movable silver point 220 on the second movable contact piece 212 first contacts the static silver point 120, and the movable silver point 220 on the first movable contact piece 211 contacts the static silver point 120 later, and in the process of the plurality of movable contact pieces 210 swinging to drive the movable silver point 220 to separate from the static silver point 120, the movable silver point 220 on the first movable contact piece 211 separates from the static silver point 120 first, and the movable silver point 220 on the second movable contact piece 212 separates from the static silver point 120 later. In the above process, the arc is more likely to be concentrated between the movable silver point 220 on the second movable contact piece 212 and the static silver point 120, so that the arc is more likely to be extinguished.

[0087] In the above structure, the number of the first moving contact piece 211 and the number of the second moving contact piece 212 can be one or more.

[0088] Exemplarily, there are five moving contact pieces 210 in total, which may include two first moving contact pieces 211 and three second moving contact pieces 212 , or include three first moving contact pieces 211 and two second moving contact pieces 212 , or include four first moving contact pieces 211 and one second moving contact piece 212 .

[0089] The plurality of second movable contact pieces 212 may be disposed adjacent to each other, or the second movable contact piece 212 and the first movable contact piece 211 may be disposed at intervals, which is not limited in the embodiment of the present application.

[0090] According to the current size when the contact system 1000 of the circuit breaker is closed, the number of the second moving contact pieces 212 can be adjusted. When the current is large, the number of the second moving contact pieces 212 is increased, and when the current is small, the number of the second moving contact pieces 212 is reduced, thereby changing the concentration of the arc and preventing the problem that the current after the arc is concentrated is too large and difficult to extinguish.

[0091] Optionally, when a plurality of movable contact pieces 210 are arranged side by side and a plurality of second movable contact pieces 212 are provided, the plurality of second movable contact pieces 212 are arranged adjacent to each other, and both sides of the whole body composed of the plurality of second movable contact pieces 212 are provided with first movable contact pieces 211. For example, when the five movable contact pieces 210 include two first movable contact pieces 211 and three second movable contact pieces 212, the three second movable contact pieces 212 are arranged adjacent to each other in the middle, and the two first movable contact pieces 211 are respectively arranged on both sides of the whole body composed of the three second movable contact pieces 212.

[0092] When a plurality of movable contact pieces 210 are arranged side by side and one second movable contact piece 212 is provided, the second movable contact piece 212 is located at the middle position.

[0093] The arc can more easily enter the middle part of the arc extinguishing chamber. When the second moving contact piece 212 is located in the middle position, the arc is also generated in the middle position. The part where the arc is generated is closer to the middle part of the arc extinguishing chamber. Therefore, the arc can more easily enter the arc extinguishing chamber, which is conducive to the rapid extinction of the arc.

[0094] like Figure 1 and Figure 4 As shown, in some embodiments, the moving contact assembly 200 also includes a contact bracket 230 and a contact spring 240. A plurality of moving contact pieces 210 are rotatably connected to the contact bracket 230 in parallel. The contact spring 240 is connected to the side of the moving contact away from the moving silver point 220, and pushes the moving contact toward the side where the static silver point 120 is located. A limiting portion 231 is also provided on the contact bracket 230, and each moving contact is pressed against the limiting portion 231 after being pushed by the contact spring 240.

[0095] When the circuit breaker is closed, after the moving silver point 220 contacts the static silver point 120, as the moving contact assembly 200 continues to approach the static silver point 120, it is squeezed by the static silver point 120, and the moving contact piece 210 squeezes the contact spring 240 and rotates in the opposite direction by a certain angle, so that there is a certain pre-pressure between the moving silver point 220 and the static silver point 120, thereby achieving good contact between the moving silver point 220 and the static silver point 120.

[0096] In some embodiments, a notch 232 can be provided on the limiting portion 231 so that part of the moving contact piece 210 abuts in the notch 232, while the other part of the moving contact piece 210 does not abut in the notch 232, so that the angle between the end of the moving contact piece 210 abutting in the notch 232 provided with the moving silver point 220 and the upper surface of the static silver point 120 is smaller than the angle between the end of the moving contact piece 210 not abutting in the notch 232 provided with the moving silver point 220 and the upper surface of the static silver point 120, the moving contact piece 210 abutting in the notch 232 is the second moving contact piece 212, and the moving contact piece 210 not abutting in the notch 232 is the first moving contact piece 211.

[0097] In the above embodiment, the contact spring 240 connected to the moving contact piece 210 abutting against the notch 232 can also be set to a spring with greater elastic force, so that the moving silver point 220 on this part of the moving contact piece 210 separates from the static silver point 120 later than the moving silver points 220 on other moving contact pieces 210.

[0098] like Figure 1 and Figure 4 As shown, in some embodiments, the moving contact assembly 200 also includes a flexible connection 250 and a moving busbar 260. The moving busbar 260 is used to connect the terminal block. The flexible connection 250 connects the moving contact to the moving busbar 260 and enables the moving contact to swing freely while maintaining electrical connection with the moving busbar 260.

[0099] An embodiment of the present application further provides a circuit breaker, comprising the contact system 1000 in any of the above embodiments.

[0100] like Figure 5 and Figure 6 As shown, in some embodiments, the circuit breaker also includes a base 300, a connecting rod 400, a rotating shaft 500 and an actuating mechanism. The base 300 is provided with a plurality of spaces, each of which accommodates a moving contact assembly 200 and a stationary contact assembly 100. The actuating mechanism can drive the rotating shaft 500 to rotate. The connecting rod 400 is drivingly connected to the rotating shaft 500. The rotation of the rotating shaft 500 can drive the connecting rod 400 to move, so that the connecting rod 400 pulls the moving contact assembly 200 to swing, thereby driving the contact assembly 200 and the stationary contact assembly 100 to contact or separate.

[0101] like Figure 6 As shown, in some embodiments, the circuit breaker further includes an arc extinguishing chamber 600 , which is disposed on a side of the stationary contact assembly 100 away from the moving contact assembly 200 and close to the arc striking plate 130 .

[0102] The arc-starting plate 130 can lead the arc when the moving silver point 220 is separated from the static silver point 120 to the arc-extinguishing chamber 600 for extinguishing, which is beneficial to the rapid arc extinguishing of the circuit breaker.

[0103] When using the circuit breaker, the user can connect the terminal blocks on the side where the moving contact assembly 200 and the side where the static contact assembly 100 are located, and fix them with terminal screws or terminal nuts. This part of the structure can refer to the wiring structure of any circuit breaker in the relevant technology, and the embodiments of the present application will not be repeated.

[0104] In summary, the contact system 1000 of the embodiment of the present application is divided into a first surface 111 and a second surface 112 by dividing the first side of the static busbar 110 into a first surface 111 and a second surface 112, the second surface 112 is sunken in the first surface 111, and the static silver point 120 is located on the second surface 112, so that when the installation position of the static busbar 110 remains unchanged, the distance between the static silver point 120 and the dynamic silver point 220 increases, which is equivalent to the increase in the opening distance between the dynamic silver point 220 and the static silver point 120 when the circuit breaker is opened, thereby improving the breaking capacity of the circuit breaker, and the arc generated when the circuit breaker is opened is pulled longer, and the arc is easier to extinguish, that is, the arc extinguishing capacity of the circuit breaker is improved. It can be understood by those skilled in the art that although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments means being within the scope of the present application and forming different embodiments. For example, in the claims, any one of the embodiments claimed for protection can be used in any combination.

[0105] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A contact system, characterized in that: include: A static contact assembly, comprising a static busbar and a static silver point, wherein a first side of the static busbar comprises a first surface and a second surface, the second surface is sunken below the first surface, and the static silver point is arranged on the second surface; The moving contact assembly comprises a moving contact piece and a moving silver point, wherein the moving silver point is arranged on a side of the moving contact piece close to the stationary contact assembly, and the swing of the moving contact piece can drive the moving silver point to contact the stationary silver point from above.

2. The contact system according to claim 1, characterized in that: The stationary contact assembly also includes an arc-starting plate, one end of which is connected to the second surface and to a side of the stationary silver point away from the moving contact assembly, the other end of which extends away from the moving contact piece, and a gap is provided between the arc-starting plate and the first surface.

3. The contact system according to claim 2, characterized in that: The edge of the upper surface of the static silver point close to the arc-starting plate is higher than the edge of the upper surface of the arc-starting plate close to the static silver point. Alternatively, the edge of the upper surface of the static silver point close to the arc-starting plate is at the same height as the edge of the upper surface of the arc-starting plate close to the static silver point.

4. The contact system according to claim 3, characterized in that: The second surface is protrudingly provided with a silver point mounting platform, and the static silver point is arranged on the silver point mounting platform; An angle is formed between the upper surface of the silver dot mounting platform and the second surface, and an opening of the angle faces the first surface.

5. The contact system according to claim 2, characterized in that: The stationary contact assembly further comprises an insulating backing plate, wherein the backing plate is located in a gap between the arc-starting plate and the first surface.

6. The contact system according to claim 5, characterized in that: The projection of the backing plate on the first surface completely covers the projection of the arc-starting plate on the first surface.

7. The contact system according to claim 5, characterized in that: The static contact assembly also includes a sleeve member and a fastener, the sleeve member is an insulating member, a first mounting hole is provided on the static busbar, a second mounting hole is provided on the pad, and a third mounting hole is provided on the arc-starting plate. The sleeve member is installed in the first mounting hole, and the fastener passes through the inner hole of the sleeve member and the second mounting hole and then is connected to the third mounting hole.

8. The contact system according to any one of claims 1 to 7, characterized in that: There are multiple moving contact pieces, and the multiple moving contact pieces are divided into a first moving contact piece and a second moving contact piece. The angle between the first moving contact piece and the upper surface of the static silver point is greater than the angle between the second moving contact piece and the upper surface of the static silver point.

9. The contact system according to claim 8, characterized in that The number of the second moving contact pieces is one or more.

10. A circuit breaker, characterized in that: A contact system comprising any one of claims 1 to 9.

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