Moving contact assembly and circuit breaker

Abstract

The embodiment of the utility model discloses a moving contact assembly and a circuit breaker, and relates to the technical field of electrical equipment. The moving contact assembly comprises a moving contact knife and a moving silver point, and one side of the moving contact knife is provided with a first wave surface and a first limiting structure; the movable silver point and the movable contact knife are oppositely arranged along a first direction, one side, close to the movable contact knife, of the movable silver point is provided with a second wavy surface and a second limiting structure, the second wavy surface is embedded and connected with the first wavy surface, and the second limiting structure is matched with the first limiting structure to limit the separation of the movable silver point and the movable contact knife; on any cross section perpendicular to the second direction, the shapes and positions of the first wave surface and the first limiting structure are not changed, so that the movable silver point is assembled with the movable contact knife along the second direction; the second direction and the first direction form an included angle. The included angle is formed between the second direction and the first direction, so that when the movable silver point is assembled with the movable contact knife along the second direction, the movable silver point is not easy to separate from the movable contact knife along the first direction.

Description

Technical Field

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

[0002] When the circuit breaker is closed, the moving silver point on the moving contact assembly contacts the static silver point on the static contact assembly to achieve circuit conduction. When the circuit breaker is opened, the circuit is disconnected by the separation of the moving silver point and the static silver point.

[0003] In terms of the breaking performance of the circuit breaker, the breaking current parameter of the circuit breaker reaches tens of kiloamperes. During the breaking test, when the circuit breaker passes a large short-circuit current, the moving contact is quickly repelled and separated under the action of the electric repulsion force. At the same time, the moving contact elongates the arc and introduces the arc into the arc extinguishing chamber. The arc extinguishing chamber cuts and cools the arc to achieve the effect of arc extinguishing. In this process, the test of the moving contact is very severe. If the welding between the moving contact blade and the moving contact is not firm, or there is a false welding, the moving contact will fall off, resulting in the product not being powered on and the test being unable to proceed.

[0004] In terms of the life of the circuit breaker, the mechanical life of the circuit breaker is generally more than 40,000 times, and the electrical life is more than 10,000 times. Such a high frequency of opening and closing requires a very high connection between the moving contact and the moving silver point. Since the moving contact has a certain overtravel, the moving contact moves and is stressed every time it is opened and closed. Therefore, the moving silver point and the moving contact knife must be welded firmly and matched reliably to avoid the problem of the silver point falling off.

[0005] In view of the above problems, in the existing moving contact structure, the connection between the moving contact blade and the moving silver point is not strong enough, and the moving silver point has a certain risk of falling off, which urgently needs to be improved. Utility Model Content

[0006] In view of the above problems, the embodiments of the present application provide a moving contact assembly and a circuit breaker, in which the moving contact blade is firmly combined with the moving silver point, and the problem of the moving silver point falling off is not likely to occur.

[0007] According to a first aspect of an embodiment of the present application, a moving contact assembly is provided, comprising a moving contact knife and a moving silver point, wherein a first wavy surface and a first limiting structure are provided on one side of the moving contact knife; the moving silver point and the moving contact knife are arranged opposite to each other along a first direction, and a second wavy surface and a second limiting structure are provided on a side of the moving silver point close to the moving contact knife, the second wavy surface is embedded and connected with the first wavy surface, and the second limiting structure cooperates with the first limiting structure to limit the separation of the moving silver point from the moving contact knife; on any cross section perpendicular to the second direction, the shape and position of the first wavy surface and the first limiting structure remain unchanged, so that the moving silver point can be assembled with the moving contact knife along the second direction; the second direction forms an angle with the first direction.

[0008] By adopting the above scheme, the first wave surface and the second wave surface can limit each other in multiple directions and multiple locations, reducing the force on the connecting parts or welding points between the first wave surface and the second wave surface, so that the connection between the movable touch knife and the movable silver point is not easy to loosen, the movable silver point is not easy to displace relative to the movable touch knife, and it is not easy to fall off the movable touch knife. Through the cooperation of the second limiting structure and the first limiting structure, the movable silver point and the movable touch knife are further tightly combined and not easy to separate. On any cross section perpendicular to the second direction, the shape and position of the first wave surface and the first limiting structure remain unchanged, so the movable silver point can be moved along the second direction to the position where the second wave surface cooperates with the first wave surface and the second limiting structure cooperates with the first limiting structure. Since the second direction and the first direction form an angle with each other, when the movable silver point is assembled with the movable touch knife along the second direction, the movable silver point is not easy to separate from the movable touch knife along the first direction.

[0009] In some embodiments, the angle between the second direction and the first direction is 90 degrees.

[0010] By adopting the above solution, when the movable silver point and the movable contact knife can be assembled or separated along the second direction, since the angle between the second direction and the first direction is 90 degrees, the movable silver point is not easily separated from the movable contact knife along the first direction.

[0011] In some embodiments, the first limiting structure is a wedge-shaped embedding groove, and the second limiting structure is a wedge-shaped embedding block, or the first limiting structure is a wedge-shaped embedding block, and the second limiting structure is a wedge-shaped embedding groove.

[0012] By adopting the above solution, the width of the part of the wedge-shaped embedding groove away from the notch is larger, and the wedge-shaped embedding groove cooperates with the wedge-shaped embedding block to better connect the moving contact knife and the moving silver point together to prevent the moving silver point from falling off the moving contact knife.

[0013] In some embodiments, a side of the moving silver point away from the second wave surface is set as an arc surface, and the arc surface is used to contact the static contact.

[0014] By adopting the above scheme, the surface of the moving silver point for contacting the static contact is set as an arc surface, so that the moving silver point and the static contact are not limited to contact at a certain position and / or angle, but within a certain angle range of rotation of the moving contact knife, the moving silver point can have good contact with the static contact, avoiding the problem of unstable contact resistance caused by virtual contact between the moving silver point and the static contact, and is also beneficial to controlling the temperature rise at the contact position.

[0015] In some embodiments, a mounting hole is provided at one end of the movable contact knife, an arc-initiating surface is provided at the other end, and the first wave surface is arranged close to the arc-initiating surface.

[0016] By adopting the above scheme, the mounting hole is used to assemble the moving contact blade with other parts of the circuit breaker. Accordingly, the end of the moving contact blade provided with the arc-striking surface swings along with the opening and closing of the circuit breaker. The first wave surface is arranged close to the arc-striking surface, that is, the moving silver point is arranged close to the arc-striking surface. When the moving silver point is separated from the static contact, an arc is generated between the moving silver point and the static contact. Since the moving silver point is close to the arc-striking surface, the arc can be transferred to the arc-striking surface and enter the arc extinguishing chamber under the guidance of the arc-striking surface, thereby reducing the burning of the moving silver point by the arc and facilitating the rapid extinguishing of the arc.

[0017] In some embodiments, the moving contact assembly further includes a protective cover, which is sleeved on the surface of the moving contact blade. The protective cover is provided with an avoidance hole, and the moving silver point is located in the avoidance hole.

[0018] By adopting the above solution, the protective cover is sleeved on the surface of the moving contact knife, which can protect the moving contact knife and prevent the electric arc from causing excessive burning to the moving contact knife.

[0019] In some embodiments, the material of the protective cover includes nylon.

[0020] By adopting the above scheme, nylon is easy to obtain, low in cost, and convenient for injection molding. In addition, nylon has the characteristic of generating gas at high temperature, so when an arc is generated, the protective cover has the function of blowing out the arc with gas, which is conducive to timely extinguishing the arc.

[0021] In some embodiments, the protective cover is in a "U" shape and wraps around the movable contact knife. A buckle is provided at the opening of the protective cover, and the buckle is clamped on the side of the movable contact knife away from the first wave surface.

[0022] By adopting the above scheme, the protective cover is in a "U" shape, which means that one end of the protective cover is open, and this structure makes it convenient to put the protective cover on the moving contact knife. A buckle is provided at the opening of the protective cover. After the protective cover is put on the moving contact knife, the buckle is clamped on the moving contact knife to prevent the protective cover from falling off, and the protective cover and the moving contact knife are fixed by the buckle, which makes the fixing of the protective cover and the moving contact knife more convenient and quick. The buckle is clamped on the side of the moving contact knife away from the first wave surface, which means that the opening of the protective cover is facing the side of the moving contact knife away from the moving silver point. Therefore, the protective cover has better wrapping and protection for the side of the moving contact knife connected to the moving silver point, preventing the electric arc from causing serious burning damage to this side.

[0023] According to a second aspect of the embodiments of the present application, a circuit breaker is provided, comprising the moving contact assembly in any one of the above embodiments.

[0024] According to a third aspect of an embodiment of the present application, a method for manufacturing a moving contact assembly is provided, comprising:

[0025] A movable contact knife is provided, and a first wave surface is provided on one side of the movable contact knife;

[0026] A moving silver point is provided, a second wave surface is provided on one side of the moving silver point, and surplus silver is provided on the second wave surface;

[0027] Assemble the moving silver point and the moving contact knife, so that the second wave surface is embedded with the first wave surface, the remaining silver is located in the gap between the first wave surface and the second wave surface, and the first wave surface and the second wave surface are welded.

[0028] By adopting the above scheme, the second wave surface has a guiding effect, which is beneficial to the gathering of excess silver on the second wave surface. During the welding process, the excess silver melts and can be evenly and fully filled between the first wave surface and the second wave surface, which is beneficial to the welding combination of the first wave surface and the second wave surface, effectively preventing the occurrence of cold solder joints, improving the firmness of welding, and preventing the moving silver point from falling off from the moving contact knife in the later stage.

[0029] The embodiment of the present application provides a moving contact assembly, which includes a moving contact blade and a moving silver point, and the moving contact blade and the moving silver point are embedded and connected through a first wave surface and a second wave surface. The force on the connecting member or welding point between the first wave surface and the second wave surface can be reduced, so that the connection between the moving contact blade and the moving silver point is not easy to loosen, the moving silver point is not easy to displace relative to the moving contact blade, and is not easy to fall off from the moving contact blade.

[0030] 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

[0031] 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.

[0032] Figure 1 Schematic diagram of the structure of a moving contact assembly in an embodiment of the present application.

[0033] Figure 2 This is a schematic diagram of the structure of a movable touch knife in an embodiment of the present application.

[0034] Figure 3 Schematic diagram of the structure of a moving silver point in an embodiment of the present application.

[0035] Figure 4 It is a schematic structural diagram of another moving contact assembly in an embodiment of the present application.

[0036] Figure 5 It is a schematic diagram of the structure of a protective cover in an embodiment of the present application.

[0037] Figure 6 This is a flow chart of a method for manufacturing a moving contact assembly in an embodiment of the present application.

[0038] Figure 7 It is a schematic diagram of the structure of the moving silver point in S200.

[0039] Explanation of the reference numerals: 100, moving contact knife; 110, first wave surface; 120, first limiting structure; 130, mounting hole; 140, arc-initiating surface; 200, moving silver point; 210, second wave surface; 220, second limiting structure; 230, arc surface; 300, protective cover; 310, avoidance hole; 320, buckle; 400, residual silver; X, first direction; Y, second direction. DETAILED DESCRIPTION

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] The directional words appearing in the following description are all directions shown in the drawings, and do not limit the specific structure of the moving contact assembly 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.

[0046] 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 moving contact assembly or the circuit breaker of the present embodiment are not absolute but relative, and although these indications are appropriate when the components of the moving contact assembly or the circuit breaker are in the positions shown in the figures, when these positions change, these directions should be interpreted differently to correspond to the changes.

[0047] 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.

[0048] 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).

[0049] 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 may refer to a physical connection. For example, the physical connection may 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 may also be a detachable connection, such as a mutual snap connection or snap connection; the physical connection may 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 may refer to an electrical connection or a signal connection in addition to a physical connection. For example, it may be a direct connection, that is, a physical connection, or it may be an indirect connection through at least one intermediate element, as long as the circuit is connected, or it may be the internal connection of two elements; the signal connection may refer to a signal connection through a media medium, such as a radio wave, in addition to a signal connection through a circuit. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0050] In the existing moving contact structure, the connection between the moving contact blade and the moving silver point is not strong enough. During the pre-factory testing of the circuit breaker and during the use of the circuit breaker, the problem of the moving silver point falling off often occurs.

[0051] In view of the above problems, the present application provides a moving contact assembly, such as Figure 1 , Figure 2 and Figure 3 As shown, the movable contact assembly provided in the embodiment of the present application includes a movable contact knife 100 and a movable silver point 200, and a first wave surface 110 and a first limiting structure 120 are provided on one side of the movable contact knife 100; the movable silver point 200 and the movable contact knife 100 are arranged opposite to each other along the first direction X, and a second wave surface 210 and a second limiting structure 220 are provided on the side of the movable silver point 200 close to the movable contact knife 100, the second wave surface 210 is embedded and connected with the first wave surface 110, and the second limiting structure 220 cooperates with the first limiting structure 120 to limit the separation of the movable silver point 200 and the movable contact knife 100; on any cross section perpendicular to the second direction Y, the shape and position of the first wave surface 110 and the first limiting structure 120 remain unchanged, so that the movable silver point 200 is assembled with the movable contact knife 100 along the second direction Y; the second direction Y and the first direction X form an angle with each other.

[0052] The first wave surface 110 and the second wave surface 210 are interlocked, which means that the crests of the first wave surface 110 and the crests of the second wave surface 210 are arranged correspondingly, and the troughs of the first wave surface 110 and the troughs of the second wave surface 210 are arranged correspondingly.

[0053] In the above case, the amplitudes of the waveforms of the first wave surface 110 and the second wave surface 210 may be consistent or inconsistent. As long as the periods of the waveforms tend to be consistent, the first wave surface 110 and the second wave surface 210 can be embedded.

[0054] It is understandable that when the amplitudes of the waveforms of the first wave surface 110 and the second wave surface 210 are consistent, the first wave surface 110 and the second wave surface 210 are completely fitted together, and there is almost no gap between them. When the amplitudes of the first wave surface 110 and the second wave surface 210 are inconsistent, there is a certain gap between the first wave surface 110 and the second wave surface 210.

[0055] The connection between the moving silver point 200 and the moving contact knife 100 can be welding or mechanical connection.

[0056] When the connection between the moving silver point 200 and the moving touch knife 100 is welding, solder can be filled between the first wave surface 110 and the second wave surface 210. For example, the amplitudes of the first wave surface 110 and the second wave surface 210 are inconsistent, and solder is filled in the gap between the first wave surface 110 and the second wave surface 210, so that the first wave surface 110 and the second wave surface 210 are connected by solder, thereby increasing the effective contact area of ​​welding, avoiding cold soldering, desoldering, etc., and effectively increasing the shear force between the moving silver point 200 and the moving touch knife 100.

[0057] When the connection between the moving silver point 200 and the moving contact knife 100 is a mechanical connection, there is no need to fill solder between the first wave surface 110 and the second wave surface 210, but electrical connection is achieved through direct contact between the first wave surface 110 and the second wave surface 210. At this time, in order to increase the contact area between the moving silver point 200 and the moving contact knife 100, the amplitudes of the first wave surface 110 and the second wave surface 210 tend to be consistent, and the first wave surface 110 and the second wave surface 210 are almost completely fitted together, thereby reducing the contact resistance between the moving silver point 200 and the moving contact knife 100 and effectively increasing the shear force between the moving silver point 200 and the moving contact knife 100.

[0058] Therefore, by adopting the above scheme, the first wave surface 110 and the second wave surface 210 can limit each other in multiple directions and multiple locations, reducing the force on the connecting parts or welding points between the first wave surface 110 and the second wave surface 210, so that the connection between the movable touch knife 100 and the movable silver point 200 is not easy to loosen, the movable silver point 200 is not easy to be displaced relative to the movable touch knife 100, and is less likely to fall off the movable touch knife 100.

[0059] It is understandable that the first wave surface 110 and the second wave surface 210 can also be replaced by serrated surfaces or other surface structures that can be interlocked with each other. These are all deformation structures based on the embodiments of the present application and fall within the protection scope of the above embodiments of the present application.

[0060] The setting of the movable touch knife 100 needs to take into account both conductivity and structural reliability. Exemplarily, the movable touch knife 100 is formed by cold stamping of a copper plate, and has a silver-plated layer on the surface. Copper has effective conductivity, and the silver-plated layer is beneficial to prevent oxidation of the copper material, which can improve the structural reliability of the movable touch knife 100.

[0061] In some embodiments, the moving silver point 200 is made of silver-tungsten alloy by powder sintering. The moving silver point 200 made of this material has high conductivity, good arc breaking performance, high anti-welding performance, low surface contact resistance, excellent wear resistance and arc resistance. Therefore, the moving silver point 200 made of this material and process can improve the performance of the moving contact assembly as a whole.

[0062] Through the cooperation of the second limiting structure 220 and the first limiting structure 120, the movable silver point 200 is further tightly combined with the movable contact knife 100 and is not easily separated. On any cross section perpendicular to the second direction Y, the shape and position of the first wave surface 110 and the first limiting structure 120 remain unchanged, so the movable silver point 200 can move along the second direction Y to the position where the second wave surface 210 cooperates with the first wave surface 110 and the second limiting structure 220 cooperates with the first limiting structure 120. And because the second direction Y and the first direction X form an angle with each other, when the movable silver point 200 is assembled with the movable contact knife 100 along the second direction Y, the movable silver point 200 is not easily separated from the movable contact knife 100 along the first direction X. Figure 2 and Figure 3 As shown, in some embodiments, the angle between the second direction and the first direction is 90 degrees.

[0063] Through the cooperation of the second limiting structure 220 and the first limiting structure 120, the movable silver point 200 and the movable contact knife 100 are further tightly combined and not easily separated. On any cross section perpendicular to the second direction Y, the shape and position of the first wave surface 110 and the first limiting structure 110 remain unchanged, so the movable silver point 200 can move along the second direction Y to the position where the second wave surface 210 cooperates with the first wave surface 110 and the second limiting structure 220 cooperates with the first limiting structure 120. Since the second direction Y and the first direction X form an angle with each other, when the movable silver point 200 is assembled with the movable contact knife 100 along the second direction Y, the movable silver point 200 is not easily separated from the movable contact knife 100 along the first direction X.

[0064] In some embodiments, the angle between the second direction Y and the first direction X is 90 degrees.

[0065] When the movable silver point 200 and the movable contact blade 100 can be assembled along the second direction Y, the movable silver point 200 and the movable contact blade 100 can also be separated along the second direction Y. Since the movable silver point 200 and the movable contact blade 100 are arranged relatively to each other along the first direction X, and when the circuit breaker is closed, the side of the movable silver point 200 away from the movable contact blade 100 contacts and hits the static contact. Therefore, when the movable silver point 200 and the movable contact blade 100 are out of the limit, it is easier to separate along the first direction X. If the intersection angle between the first direction X and the second direction Y is too small, the first direction X and the second direction Y are basically overlapped, and the movable silver point 200 is easy to fall off along the second direction Y.

[0066] In this embodiment, the included angle between the second direction Y and the first direction X is 90 degrees, so that the movable silver point 200 is least likely to be separated from the movable contact knife 100 along the first direction X, and the firmness of the combination of the movable silver point 200 and the movable contact knife 100 is further improved.

[0067] In some embodiments, the first limiting structure 120 is a wedge-shaped embedding groove, and the second limiting structure 220 is a wedge-shaped embedding block.

[0068] In other embodiments, the first limiting structure 120 is a wedge-shaped embedding block, and the second limiting structure 220 is a wedge-shaped embedding groove.

[0069] The wedge-shaped embedding groove generally has a larger width at a portion away from the groove opening in the depth direction, so that when a wedge-shaped embedding block adapted to the wedge-shaped embedding groove is installed in the wedge-shaped embedding groove, the wedge-shaped embedding block is not easy to escape from the wedge-shaped embedding groove.

[0070] Taking the first limiting structure 120 as a wedge-shaped embedding groove and the second limiting structure 220 as a wedge-shaped embedding block as an example, the wedge-shaped embedding groove can be a structure additionally provided outside the first wave surface 110, that is, the wedge-shaped embedding groove and the first wave surface 110 are independent of each other; or a wedge-shaped embedding groove structure can be provided on the movable contact knife 100, and the first wave surface 110 is used as the bottom surface of the wedge-shaped embedding groove. In this case, the first wave surface 110 is used as a surface of the wedge-shaped embedding groove. Similarly, the wedge-shaped embedding block can be a structure additionally provided outside the second wave surface 210, that is, the wedge-shaped embedding block and the second wave surface 210 are independent of each other; or a wedge-shaped embedding block structure can be provided on the movable silver point 200, and the second wave surface 210 is used as the top surface of the wedge-shaped embedding block. In this case, the second wave surface 210 is used as a surface of the wedge-shaped embedding block.

[0071] When the first limiting structure 120 is a wedge-shaped embedding block and the second limiting structure 220 is a wedge-shaped embedding groove, reference may also be made to any possible structure described above.

[0072] When assembling the movable contact knife 100 and the movable silver point 200, the movable silver point 200 can be translated from the side of the movable contact knife 100 to the position of the movable contact knife 100 for installing the movable silver point 200, so that the wedge-shaped insert and the wedge-shaped insert groove are matched. Exemplarily, when the movable silver point 200 is installed on the lower side of the movable contact knife 100, during the assembly process, the movable silver point 200 can be moved in the left and right direction of the movable contact knife 100 to realize the assembly of the wedge-shaped insert groove and the wedge-shaped insert. After the assembly is completed, the movable silver point 200 and the movable contact knife 100 are restricted by the wedge-shaped insert groove and the wedge-shaped insert block, so that the movable silver point 200 is not easy to separate from the movable contact knife 100 in the up and down direction, so that the movable silver point 200 is not easy to fall off.

[0073] like Figure 3 As shown, in some embodiments, a side of the moving silver point 200 away from the second wave surface 210 is set as an arc surface 230, and the arc surface 230 is used to contact the static contact.

[0074] The structure of the stationary contact for contacting the moving silver point 200 is not within the protection scope of this embodiment of the present application, so this embodiment of the present application does not limit it.

[0075] Optionally, the arc surface 230 is an arc surface 230 cut from the side surface of a cylinder, and the axis of the arc surface 230 is substantially perpendicular to the length direction of the movable touch knife 100 .

[0076] By adopting the above solution, the moving silver point 200 and the static contact are not limited to contact at a certain position and / or angle, but within a certain angle range of rotation of the moving contact knife 100, the moving silver point 200 can have good contact with the static contact, thereby avoiding the problem of unstable contact resistance caused by virtual contact between the moving silver point 200 and the static contact, and is also beneficial to controlling the temperature rise at the contact position.

[0077] Optionally, the arc surface 230 of the moving silver point 200 has a larger curvature. When the arc surface 230 contacts the stationary contact, the contact area is also larger, thereby further reducing the contact resistance between the moving silver point 200 and the stationary contact, which is beneficial to controlling the temperature rise at the contact position. In addition, the larger curvature of the arc surface 230 is also beneficial to reducing the volume of the moving silver point 200, achieving the purpose of saving materials and thus saving costs.

[0078] The specific curvature of the arc surface 230 can be set according to the specifications of the circuit breaker to which the moving contact is applicable. The embodiment of the present application does not impose a specific numerical limit on the curvature of the arc surface 230.

[0079] like Figure 1 and Figure 2 As shown, in some embodiments, a mounting hole 130 is provided at one end of the movable contact knife 100 , and an arc-inducing surface 140 is provided at the other end, and the first wave surface 110 is arranged close to the arc-inducing surface 140 .

[0080] The mounting hole 130 is used to assemble the movable contact blade 100 with other components of the circuit breaker. Accordingly, one end of the movable contact blade 100 provided with the arc-inducing surface 140 swings along with the opening and closing of the circuit breaker.

[0081] The first wave surface 110 is arranged close to the arc-striking surface 140, that is, the moving silver point 200 is arranged close to the arc-striking surface 140. When the moving silver point 200 is separated from the static contact, an arc is generated between the moving silver point 200 and the static contact. Since the moving silver point 200 is close to the arc-striking surface 140, the arc can be transferred to the arc-striking surface 140 and enter the arc extinguishing chamber under the guidance of the arc-striking surface 140, thereby reducing the burning of the moving silver point 200 by the arc, which is conducive to the rapid extinguishing of the arc.

[0082] like Figure 4 and Figure 5 As shown, in some embodiments, the moving contact assembly further includes a protective cover 300 , which is sleeved on the surface of the moving contact blade 100 , and an avoidance hole 310 is provided on the protective cover 300 , and the moving silver point 200 is located in the avoidance hole 310 .

[0083] The material of the protective cover 300 is an insulating and heat-insulating material and has a high temperature resistance property to prevent the protective cover 300 from melting.

[0084] In some embodiments, the material of the protective cover 300 includes nylon.

[0085] Specifically, the protective cover 300 may be made of reinforced PA66 nylon by injection molding.

[0086] Nylon is easy to obtain, low in cost, and convenient for injection molding. In addition, nylon has the characteristic of generating gas at high temperature, so when an arc is generated, the protective cover 300 has the function of blowing out the arc by gas, which is conducive to timely extinguishing the arc.

[0087] The protective cover 300 is sleeved on the surface of the movable contact knife 100 to protect the movable contact knife 100 and prevent the electric arc from causing excessive burning damage to the movable contact knife 100.

[0088] The protective cover 300 may be mounted on a portion of the surface of the movable contact knife 100 , or may be mounted on the entire surface of the movable contact knife 100 .

[0089] Optionally, the protective cover 300 is sleeved on the surface of the movable contact knife 100 close to the movable silver point 200 .

[0090] Since the starting and ending points of the arc are located at the moving silver point 200 during the use of the moving contact assembly, the temperature of the part close to the moving silver point 200 rises rapidly, and the moving contact blade 100 is easily burned and damaged. The protective cover 300 is placed at this position to prevent the moving contact blade 100 from directly contacting the arc and reduce the burning damage of the arc to the moving contact blade 100.

[0091] Optionally, the protective cover 300 is at least located on the surface of the moving contact blade 100 on the side of the moving silver point 200 close to the mounting hole 130. The protective cover 300 wraps this position, which can reduce the risk of the arc transferring to the side of the mounting hole 130, so that the arc is transferred as far away from the mounting hole 130 as possible, so as to facilitate the arc to enter the arc extinguishing chamber.

[0092] In some embodiments, the protective cover 300 is in a “U” shape and wraps around the movable contact knife 100 . A buckle 320 is provided at the opening of the protective cover 300 , and the buckle 320 is clamped on the side of the movable contact knife 100 away from the first wave surface 110 .

[0093] The protective cover 300 is in a "U" shape, which means that one end of the protective cover 300 is open. This structure makes it convenient to put the protective cover 300 on the movable contact knife 100.

[0094] A buckle 320 is provided at the opening of the protective cover 300. After the protective cover 300 is put on the movable contact knife 100, the buckle 320 is clamped on the movable contact knife 100 to prevent the protective cover 300 from falling off. The protective cover 300 and the movable contact knife 100 are fixed by the buckle 320, and the fixing of the protective cover 300 and the movable contact knife 100 is more convenient and quick.

[0095] The buckle 320 is stuck on the side of the moving contact knife 100 away from the first wave surface 110, which means that the opening of the protective cover is toward the side of the moving contact knife 100 away from the moving silver point 200. Therefore, the protective cover has better wrapping and protection for the side of the moving contact knife 100 connected to the moving silver point 200, preventing the electric arc from causing serious burning damage to this side.

[0096] Optionally, a buckle 320 is provided on each side of the opening of the protective cover 300 , and the two buckles 320 are clamped on the movable contact knife 100 from both sides, which has a better fixing effect on the protective cover 300 .

[0097] Exemplarily, the buckle 320 may be a protrusion provided on the inner side of the opening of the protective cover 300. When assembling the protective cover 300 and the movable contact knife 100, the protective cover 300 is first opened from the opening side so that the opening of the protective cover 300 is sleeved on the side of the movable contact knife 100 provided with the first wave surface 110, and the buckle 320 abuts against the two sides of the movable contact knife 100, and the protective cover 300 is pushed so that the movable contact knife 100 is inserted from the opening of the protective cover 300. In this process, the buckle 320 abuts against the side walls on both sides of the movable contact knife 100 and slides until the buckle 320 slides out from the side walls on both sides of the movable contact knife 100 and is separated from the abutment with the side walls of the movable contact knife 100. At this time, under the action of the elastic force, the protective cover 300 returns to its original shape, and the buckle 320 abuts against the side of the movable contact knife 100 away from the first wave surface 110, thereby fixing the protective cover 300 and the movable contact knife 100.

[0098] It can be seen that the protective cover 300 of the above structure is easy to assemble with the movable contact knife 100. After assembly, the protective cover 300 is not easy to fall off from the movable contact knife 100.

[0099] In summary, the embodiment of the present application provides a movable contact assembly, which includes a movable contact blade 100 and a movable silver point 200, and the movable contact blade 100 and the movable silver point 200 are embedded and connected through the first wave surface 110 and the second wave surface 210. The force on the connecting member or welding point between the first wave surface 110 and the second wave surface 210 can be reduced, so that the connection between the movable contact blade 100 and the movable silver point 200 is not easy to loosen, the movable silver point 200 is not easy to be displaced relative to the movable contact blade 100, and it is not easy to fall off from the movable contact blade 100.

[0100] The present application also provides a method for manufacturing a moving contact assembly, which is used to manufacture the moving contact assembly in any of the above embodiments. Figure 6 As shown, the manufacturing method of the moving contact assembly includes the following steps.

[0101] S100: Provide a movable contact knife 100, wherein a first wavy surface 110 is provided on one side of the movable contact knife 100.

[0102] S200: providing a movable silver point 200, a second wavy surface 210 is provided on one side of the movable silver point 200, and residual silver 400 is provided on the second wavy surface 210.

[0103] S300: Assemble the movable silver point 200 and the movable contact knife 100, so that the second wave surface 210 is embedded with the first wave surface 110, the remaining silver 400 is located in the gap between the first wave surface 110 and the second wave surface 210, and the first wave surface 110 and the second wave surface 210 are welded.

[0104] The relevant technical features in the above-mentioned manufacturing method can refer to the relevant features in the above-mentioned embodiment of the moving contact assembly, and the embodiments of this application will not be repeated.

[0105] like Figure 7 As shown, Figure 7 2 is a schematic diagram of the structure of the moving silver point in S200. The excess silver 400 is the excess silver material located on the second wave surface 210, which can be a silver alloy or pure silver. For example, the excess silver 400 can be obtained by melting silver foil.

[0106] By adopting the above scheme, the second wave surface 210 has a guiding effect, which is beneficial to the gathering of the excess silver 400 in the trough of the second wave surface 210. During the welding process, the excess silver 400 melts, so that it can be evenly and fully filled between the first wave surface 110 and the second wave surface 210, which is beneficial to the welding combination of the first wave surface 110 and the second wave surface 210, effectively preventing the occurrence of cold welding, improving the firmness of welding, and preventing the moving silver point 200 from falling off from the moving contact knife 100 at a later time.

[0107] In this embodiment, the above steps may be performed in different orders. For example, S100 and S200 may be performed simultaneously or sequentially. This embodiment of the present application does not limit this.

[0108] An embodiment of the present application further provides a circuit breaker, comprising the moving contact assembly in any of the above embodiments.

[0109] The circuit breaker using the moving contact assembly in the above embodiment has a stable structure of the moving contact assembly, so the circuit breaker has reliable opening and closing performance, a long service life, and is not easy to be damaged.

[0110] Those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0111] 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 moving contact assembly, characterized in that: include: A movable contact knife, wherein one side of the movable contact knife is provided with a first wave surface and a first limiting structure; and A movable silver point is arranged opposite to the movable contact knife along a first direction, a second wave surface and a second limiting structure are provided on a side of the movable silver point close to the movable contact knife, the second wave surface is embedded and connected with the first wave surface, and the second limiting structure cooperates with the first limiting structure to limit the separation of the movable silver point from the movable contact knife; On any cross section perpendicular to the second direction, the shapes and positions of the first wave surface and the first limiting structure remain unchanged, so that the movable silver point is assembled with the movable contact knife along the second direction; The second direction and the first direction form an angle with each other.

2. The moving contact assembly according to claim 1, characterized in that: The included angle between the second direction and the first direction is 90 degrees.

3. The moving contact assembly according to claim 1, characterized in that: The first limiting structure is a wedge-shaped embedding groove, the second limiting structure is a wedge-shaped embedding block, or, The first limiting structure is a wedge-shaped embedding block, and the second limiting structure is a wedge-shaped embedding groove.

4. The moving contact assembly according to any one of claims 1 to 3, characterized in that: A side of the moving silver point away from the second wave surface is set as an arc surface, and the arc surface is used to contact the static contact.

5. The moving contact assembly according to any one of claims 1 to 3, characterized in that: The movable contact knife has a mounting hole at one end and an arc-initiating surface at the other end, and the first wave surface is arranged close to the arc-initiating surface.

6. The moving contact assembly according to any one of claims 1 to 3, characterized in that: It also includes a protective cover, which is sleeved on the surface of the movable contact knife. The protective cover is provided with an avoidance hole, and the movable silver point is located in the avoidance hole.

7. The moving contact assembly according to claim 6, characterized in that: The material of the protective cover includes nylon.

8. The moving contact assembly according to claim 6, characterized in that: The protective cover is in a "U" shape and wraps around the movable contact knife. A buckle is provided at the opening of the protective cover, and the buckle is clamped on the side of the movable contact knife away from the first wave surface.

9. A circuit breaker, characterized in that: The movable contact assembly comprises the moving contact assembly as described in any one of claims 1 to 8.

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