Contact structure and circuit breaker

Abstract

The present application proposes a contact structure and a circuit breaker, which relates to the technical field of electrical equipment, and includes a moving contact assembly, a static contact assembly and an elastic member, wherein the moving contact assembly cooperates with the static contact assembly, and the elastic member is connected to the side of the moving contact assembly away from the static contact assembly. The side of the moving contact assembly facing the static contact assembly has a first end and a second end that are opposite, and the side of the static contact assembly facing the moving contact assembly has a third end and a fourth end that are opposite. When the circuit breaker is closed and the contact structure is in the initial stage of use, the first end contacts the third end. When the circuit breaker is closed and the contact structure is in the wear stage, the elastic member releases elastic potential energy and pushes the contact assembly to make the contact relationship between the moving contact assembly and the static contact assembly migrate from the contact between the first end and the third end to the contact between the second end and the fourth end. Therefore, when the contact structure is in the wear stage, the contact positions of the moving contact assembly and the static contact assembly can be migrated, thereby improving the service life of the circuit breaker.

Description

Technical Field

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

[0002] A circuit breaker is a device that cuts off or connects a circuit to ensure the normal operation of the circuit. Its main circuit contact system generally includes a moving contact assembly and a stationary contact assembly. When the circuit breaker is closed, the moving contact assembly will rotate toward the stationary contact assembly and contact the stationary contact to connect the circuit.

[0003] However, during the use of the circuit breaker, the moving contact assembly and the stationary contact assembly are constantly in contact and separation, which may cause the moving contact assembly and the stationary contact assembly to wear, affect the contact state of the moving contact assembly and the stationary contact assembly, and thus limit the service life of the circuit breaker. Utility Model Content

[0004] The present application provides a contact structure and a circuit breaker, which can adapt to the wear of a moving contact assembly and a stationary contact assembly and increase the service life of the circuit breaker.

[0005] In a first aspect, the present application provides a contact structure, which is applied to a circuit breaker, and the contact structure includes a moving contact assembly, a stationary contact assembly, and an elastic member, wherein the moving contact assembly cooperates with the stationary contact assembly, and the elastic member is connected to a side of the moving contact assembly away from the stationary contact assembly. The moving contact assembly has a first end and a second end opposite to the stationary contact assembly on one side thereof, and the stationary contact assembly has a third end and a fourth end opposite to the one side thereof.

[0006] When the circuit breaker is closed and the contact structure is in the initial stage of use, the first end contacts the third end. When the circuit breaker is closed and the contact structure is in the wear stage, the elastic member releases elastic potential energy and pushes the contact assembly to make the contact relationship between the moving contact assembly and the static contact assembly migrate from the first end contacting the third end to the second end contacting the fourth end.

[0007] In an embodiment of the present application, when the circuit breaker is closed and the contact structure is in the initial stage of use, the first end can contact the third end to achieve the connection of the circuit breaker. As the circuit breaker is used, the contact structure will wear, and a gap will be generated between the first end and the third end, causing the moving contact assembly and the static contact assembly to separate. At this time, the elastic member can stretch under the action of its own elastic force, and push the contact assembly, so that the moving contact assembly rotates toward the side close to the static contact assembly until the moving contact assembly re-contacts the static contact assembly. As the degree of wear of the contact structure increases, the elastic member continuously releases elastic potential energy to drive the moving contact assembly to rotate until the second end contacts the fourth end.

[0008] That is, the moving contact assembly proposed in the present application can rotate according to the wear of the contact structure, so that the contact position of the moving contact assembly and the static contact assembly can be moved, and the moving contact assembly and the static contact assembly can be kept in good contact. This can avoid the situation where the moving contact assembly and the static contact assembly are separated when the circuit breaker is closed after the contact structure is worn, causing the circuit breaker to fail to work normally, thereby improving the service life of the circuit breaker.

[0009] Optionally, the stationary contact assembly is tilted toward one side of the moving contact assembly, so that from the initial use stage to the wear stage, the distance between the first end and the third end increases, and the distance between the second end and the fourth end decreases.

[0010] By tilting the stationary contact assembly, it is easy to achieve a setting in which the distance between the first end and the third end is small and the distance between the second end and the fourth end is large. Therefore, in the early stage of the use of the contact structure, the first end with a smaller distance contacts the third end first. As the contact structure wears, the distance between the second end and the fourth end gradually decreases, and in the later stage of wear, the second end can contact the fourth end.

[0011] Optionally, the stationary contact assembly includes a stationary contact and a stationary contact mounting member, the stationary contact mounting member has a first mounting surface facing the moving contact assembly, the stationary contact is connected to the first mounting surface, the first mounting surface is tilted, and / or the stationary contact is tilted toward one side of the moving contact assembly.

[0012] Through the above solution, the stationary contact assembly can be tilted in different ways, so that the contact position of the moving contact assembly and the stationary contact assembly can be migrated as the contact structure wears.

[0013] Optionally, the moving contact assembly includes a moving contact, and a surface of the moving contact facing the stationary contact is an arc surface or a parabola.

[0014] By setting the side of the moving contact facing the static contact to be an arc surface or a parabola, the surface of the moving contact facing the static contact can be made smoother, and when the circuit breaker is closed, the problem of damaging the static contact when the moving contact contacts the static contact can be avoided.

[0015] Optionally, the moving contact assembly further comprises a moving contact mounting member, the moving contact mounting member has a second mounting surface facing the stationary contact assembly, the moving contact is connected to the second mounting surface, and the elastic member is connected to a side of the moving contact mounting member away from the moving contact. The second mounting surface is inclined.

[0016] By tilting the second mounting surface, the moving contact can be tilted, which can facilitate the setting of a smaller distance between the first end and the third end and a larger distance between the second end and the fourth end.

[0017] Optionally, the moving contact assembly includes a moving contact and a moving contact mounting piece, and the elastic piece and the moving contact are connected to opposite sides of the moving contact mounting piece. A mounting groove is provided on the side of the moving contact mounting piece facing the stationary contact assembly, and a mounting boss is provided on the moving contact, and the mounting boss is embedded in the mounting groove. Alternatively, a mounting protrusion is provided on the side of the moving contact mounting piece facing the stationary contact mounting piece, and a mounting slot is provided on the moving contact, and the mounting protrusion is embedded in the mounting slot.

[0018] Through the above arrangement, the moving contact and the moving contact mounting piece can be matched through the mounting boss and the mounting groove, or through the mounting protrusion and the mounting slot. When the moving contact is welded to the moving contact mounting piece, it can be easily positioned. In addition, the contact area between the moving contact and the moving contact mounting surface can be increased, thereby improving the welding strength.

[0019] Optionally, the stationary contact assembly includes a stationary contact and a stationary contact mounting piece. A clamping groove is provided on the side of the stationary contact mounting piece facing the moving contact assembly, a clamping boss is provided on the stationary contact, and the clamping boss is embedded in the clamping groove. Alternatively, a clamping protrusion is provided on the side of the stationary contact mounting piece facing the moving contact assembly, a clamping slot is provided on the stationary contact, and the clamping protrusion is embedded in the clamping slot.

[0020] Through the above arrangement, the static contact and the static contact mounting piece can be matched through the clamping boss and the clamping groove, or through the clamping protrusion and the clamping groove. When the static contact is welded on the static contact mounting piece, it can be easily positioned. In addition, the contact area between the static contact and the static contact mounting surface can be increased, thereby improving the welding strength.

[0021] Optionally, an assembly boss is provided on the second mounting surface, and the movable contact is connected to the assembly boss. An arc-starting inclined surface is provided between a side of the assembly boss facing the static contact assembly and the second mounting surface.

[0022] Through the above arrangement, when the circuit breaker is opened, the arc generated between the static contact and the moving contact can move quickly along the arc striking slope, which is beneficial to reducing the erosion of the moving contact and the static contact by the arc.

[0023] Optionally, the circuit breaker includes an arc extinguishing chamber, and when the circuit breaker is closed, the contact position of the moving contact assembly and the static contact assembly is opposite to the arc extinguishing chamber. The arc striking slope is located on a side of the assembly boss close to the arc extinguishing chamber.

[0024] Through the above arrangement, the arc-striking slope is located on the side of the assembly boss close to the arc-extinguishing chamber. Therefore, when an arc is generated, the arc-striking slope can guide the arc to move toward the arc-extinguishing chamber, which is beneficial to the rapid extinction of the arc and improves the breaking performance of the circuit breaker.

[0025] In a second aspect, the present application provides a circuit breaker, the circuit breaker comprising any contact structure of the above-mentioned first aspect.

[0026] The beneficial effects provided in the above-mentioned second aspect and various possible designs of the above-mentioned second aspect can refer to the beneficial effects brought about by the above-mentioned first aspect and various possible implementation methods of the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is one of the schematic diagrams of a contact structure according to an embodiment of the present application.

[0028] Figure 2 This is a second schematic diagram of a contact structure according to an embodiment of the present application.

[0029] Figure 3 for Figure 2 A partial enlarged view of point A in the middle.

[0030] Figure 4 This is a third schematic diagram of a contact structure according to an embodiment of the present application.

[0031] Figure 5 This is a schematic diagram of a static contact assembly according to an embodiment of the present application.

[0032] Figure 6 A schematic diagram of another static contact assembly according to an embodiment of the present application.

[0033] Figure 7 This is a schematic diagram of a moving contact mounting component according to an embodiment of the present application.

[0034] Figure 8 This is a schematic diagram of another moving contact mounting component according to an embodiment of the present application.

[0035] Fig. 9 This is a schematic diagram of a moving contact assembly according to an embodiment of the present application.

[0036] Description of reference numerals:

[0037] 100: contact structure; 10: moving contact assembly; 20: stationary contact assembly; 30: elastic member; 40: contact support; 101: rotation center; 11: first end; 12: second end; 21: third end; 22: fourth end; 23: stationary contact; 24: stationary contact mounting member; 241: first mounting surface; 13: moving contact; 14: moving contact mounting member; 141: second mounting surface; 142: mounting groove; 131: mounting boss; 143: assembly boss; 144: arc-striking slope; 231: first contact surface; 232: second contact surface; X: first direction; Y: second direction. DETAILED DESCRIPTION

[0038] 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.

[0039] 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; the terms "including" and "having" and any variations thereof in the specification, claims and drawings of this application are intended to cover non-exclusive inclusions.

[0040] 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.

[0041] 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, A and B exist at the same time, and B exists. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0042] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of the current limiting module 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", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0043] 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.

[0044] 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).

[0045] 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 barrier, such as a fixed connection through a screw, bolt or other barrier; 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. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances. 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; the signal connection can 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.

[0046] It should be understood that the references to "one embodiment" or "an embodiment" throughout the specification mean that the specific features, structures, or characteristics associated with the embodiment are included in at least one embodiment of the present application. Therefore, the references to "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0047] Reference Figure 1 , Figure 2 and Figure 3 As shown, the present application proposes a contact structure 100, which is applied to a circuit breaker. The contact structure 100 includes a moving contact assembly 10, a stationary contact assembly 20 and an elastic member 30. The moving contact assembly 10 cooperates with the stationary contact assembly 20, and the elastic member 30 is connected to a side of the moving contact assembly 10 away from the stationary contact assembly 20. The moving contact assembly 10 has a first end 11 and a second end 12 opposite to each other on a side facing the stationary contact assembly 20, and the stationary contact assembly 20 has a third end 21 and a fourth end 22 opposite to each other on a side facing the moving contact assembly 10.

[0048] When the circuit breaker is closed and the contact structure 100 is in the initial use, the first end 11 is in contact with the third end 21. When the circuit breaker is closed and the contact structure 100 is in the wear stage, the elastic member 30 releases elastic potential energy and pushes the contact assembly 10, so that the contact relationship between the moving contact assembly 10 and the static contact assembly 20 is transferred from the contact between the first end 11 and the third end 21 to the contact between the second end 12 and the fourth end 22.

[0049] In the embodiment of the present application, the contact structure 100 includes a moving contact assembly 10 and a stationary contact assembly 20. The moving contact assembly 10 and the stationary contact assembly 20 can cooperate to realize the closing or opening of the circuit breaker. Specifically, when the circuit breaker is closed, the moving contact assembly 10 can rotate in a direction close to the stationary contact assembly 20 and contact the stationary contact assembly 20, so that the circuit breaker is in a closed state. When the circuit breaker is opened, the moving contact assembly 10 can rotate in a direction away from the stationary contact assembly 20 and separate from the stationary contact assembly 20, so that the circuit breaker is in a disconnected state.

[0050] Reference Figure 1 and Figure 2 The contact structure 100 also includes an elastic member 30, which is connected to the side of the moving contact assembly 10 away from the static contact assembly 20. The elastic member 30 can provide a driving force for the moving contact assembly 10 so that the moving contact assembly 10 can rotate relative to the static contact assembly 20, so that when the circuit breaker is closed, the moving contact assembly 10 and the static contact assembly 20 can contact at different positions.

[0051] Specifically, the side of the moving contact assembly 10 facing the stationary contact assembly 20 has a first end 11 and a second end 12, and the side of the stationary contact assembly 20 facing the moving contact assembly 10 has a third end 21 and a fourth end 22. When the circuit breaker is closed and the contact structure 100 is in the initial use, the first end 11 can contact the third end 21 to achieve the connection of the circuit breaker. Figure 1 shown.

[0052] As the circuit breaker is used, the contact structure 100 will wear and a gap will be generated between the first end 11 and the third end 21, causing the moving contact assembly 10 and the static contact assembly 20 to separate. At this time, the elastic member 30 can stretch under the action of its own elastic force and push the contact assembly 10, so that the moving contact assembly 10 rotates toward the side close to the static contact assembly 20 until the moving contact assembly 10 and the static contact assembly 20 are re-contacted. At this time, the static contact assembly 20 restricts the moving contact assembly 10 from continuing to move, and the elastic member 30 is stationary. As the degree of wear of the contact structure 100 increases, the elastic member 30 continuously releases elastic potential energy and drives the moving contact assembly 10 to rotate until the second end 12 contacts the fourth end 22, as shown in FIG. Figure 4 shown.

[0053] That is, in the present application, when the contact structure 100 is worn, the elastic member 30 can push the contact assembly 10, so that the moving contact assembly 10 can continue to rotate and re-contact with the static contact assembly 20 until the second end 12 contacts the fourth end 22. Therefore, the moving contact assembly 10 proposed in the present application can rotate according to the wear of the contact structure 100, so that the contact position of the moving contact assembly 10 and the static contact assembly 20 is migrated, and the moving contact assembly 10 and the static contact assembly 20 are kept in good contact. Thereby, after the contact structure 100 is worn, the moving contact assembly 10 and the static contact assembly 20 are separated when the circuit breaker is closed, which causes the circuit breaker to fail to work normally, thereby improving the service life of the circuit breaker.

[0054] It should be noted that if Figure 4 As shown, the contact structure 100 further includes a contact support 40, the moving contact assembly 10 is mounted on the contact support 40, one end of the elastic member 30 is connected to the contact support 40, and the other end of the elastic member 30 is connected to the moving contact assembly 10. The moving contact assembly 10 also has a rotation center 101, and the elastic member 30 is used to drive the moving contact assembly 10 to rotate around the rotation center 101, so that the contact relationship between the moving contact assembly 10 and the stationary contact assembly 20 changes.

[0055] When the circuit breaker needs to be closed, taking the contact structure 100 as an example, the contact support 40 drives the moving contact assembly 10 to rotate clockwise and compresses the elastic member 30, so that the elastic member 30 stores energy. When the moving contact assembly 10 rotates clockwise until it contacts the static contact assembly 20, the circuit breaker can be closed. When the moving contact assembly 10 contacts the static contact assembly 20, the elastic member 30 releases elastic potential energy and pushes the contact assembly 10, so that the moving contact assembly 10 can maintain a close contact state with the static contact assembly 20.

[0056] Wherein, whether the contact structure 100 is in the initial use stage or in the wear stage, the rotation angle of the contact support 40 is consistent during the process from opening to closing of the circuit breaker.

[0057] When the contact structure 100 is in the initial stage of use, the moving contact assembly 10 and the stationary contact assembly 20 are not worn. After the rotation process of the contact support 40 is completed, the elastic member 30 is in a compressed state, and the first end 11 is in contact with the third end 21 .

[0058] As the contact structure 100 is used, the moving contact assembly 10 and the stationary contact assembly 20 in the contact structure 100 are worn to varying degrees, causing the contact structure 100 to enter a wear stage. In this wear stage, after the rotation process of the contact support 40 is completed, the first end 11 and the third end 21 are separated, and at this time, the elastic member 30 is elongated compared to the unworn state of the contact structure 100, and drives the moving contact assembly 10 to rotate around the rotation center 101, so that the moving contact assembly 10 can continue to rotate clockwise, so that the moving contact assembly 10 and the stationary contact assembly 20 are in contact again.

[0059] It should be noted that, for ease of understanding, in the above description of the circuit breaker being closed and the contact structure 100 being in the wear stage, the rotation of the contact support 40 and the movement of the elastic member 30 are described separately. However, in actual applications, the rotation of the contact support 40 and the movement of the elastic member 30 occur in coordination. That is, when the circuit breaker is closed, the contact support 40 drives the moving contact assembly 10 to rotate, and after the moving contact assembly 10 contacts the static contact assembly 20, the static contact assembly 20 provides a reaction force to the moving contact assembly 10, compressing the elastic member 30 until the moving contact assembly 10 is balanced under the action of the contact support 40, the elastic member 30 and the static contact assembly 20, and the closing is completed. Instead, the non-contact support 40 rotates first, and the elastic member 30 moves after the rotation of the contact support 40 is completed.

[0060] It is understandable that after the contact structure 100 is worn, when the circuit breaker is closed, the elastic member 30 stretches and drives the moving contact assembly 10 to rotate around the rotation center 101. In reality, compared with the initial use of the contact structure 100, the compression amount of the elastic member 30 will be reduced, and the rotation angle of the moving contact assembly 10 along the rotation center 101 will increase.

[0061] It should also be noted that the contact structure 100 has a first direction X and a second direction Y, wherein the first direction X is the direction from the moving contact assembly 10 to the stationary contact assembly 20 when the circuit breaker is closed, and the second direction Y is perpendicular to the first direction X and is the height direction of the moving contact assembly 10. Figure 1 , Figure 4 The second direction Y is the direction from the lower end to the upper end of the stationary contact assembly 20 , and the first direction X is the direction from the left end to the right end of the elastic member 30 .

[0062] like Figure 2 and Figure 3As shown, the first end 11 and the second end 12 are opposite ends of the side of the moving contact assembly 10 facing the stationary contact assembly 20 in the second direction Y. The first end 11 and the second end 12 are respectively two extreme positions of the side of the moving contact assembly 10 facing the stationary contact assembly 20 in the second direction Y, that is, in the second direction Y, the first end 11 and the second end 12 are the two positions with the largest distance on the side of the moving contact assembly 10 facing the stationary contact assembly 20.

[0063] Similarly, the third end 21 and the fourth end 22 are opposite ends of the side of the static contact assembly 20 facing the moving contact assembly 10 in the second direction Y. The third end 21 and the fourth end 22 are respectively two extreme positions of the side of the static contact assembly 20 facing the moving contact assembly 10 in the second direction Y, that is, in the second direction Y, the third end 21 and the fourth end 22 are two positions with the largest distance on the side of the static contact assembly 20 facing the moving contact assembly 10.

[0064] Based on the above description, when the circuit breaker is closed and the contact structure 100 is in the initial use, the contact between the first end 11 and the third end 21 is equivalent to the contact between the lowermost end of the moving contact assembly 10 and the lowermost end of the static contact assembly 20 .

[0065] When the contact structure 100 is worn due to mechanical friction, electrical erosion, etc., the contact position of the moving contact assembly 10 and the stationary contact assembly 20 will migrate upward from the lower end until the upper end of the moving contact assembly 10 contacts the upper end of the stationary contact assembly 20, or until the second end 12 contacts the fourth end 22.

[0066] During the above migration process, the side of the moving contact assembly 10 facing the static contact assembly 20 from the lower end to the upper end, and the side of the static contact assembly 20 facing the moving contact assembly 10 from the lower end to the upper end can both participate in the contact, which can make the utilization rate of the moving contact assembly 10 and the static contact assembly 20 higher and improve the service life of the contact structure 100.

[0067] The elastic member 30 is an elastic member, such as a spring, a spring, etc. Of course, the elastic member 30 may also be other structures, for example, a cylindrical structure made of an elastic material, etc. The specific form of the elastic member 30 is not specifically limited in the embodiment of the present application, as long as it is elastic and can drive the moving contact assembly 10 to rotate when the contact structure 100 is worn.

[0068] In addition, in the embodiment of the present application, the contact position of the moving contact assembly 10 and the stationary contact assembly 20 will migrate from the contact between the first end 11 and the third end 21 to the contact between the second end 12 and the fourth end 22 as the contact position wears. Ideally, the wear degree of the moving contact assembly 10 and the stationary contact assembly 20 is similar. When the contact position migrates, the contact position between the moving contact assembly 10 and the stationary contact assembly 20 and the contact position between the stationary contact assembly 20 and the moving contact assembly 10 migrate synchronously. That is, in the initial use, the first end 11 contacts the third end 21, such as Figure 1 In the middle of wear, the middle of the moving contact assembly 10 may contact the middle of the stationary contact assembly 20, as shown. Figure 2 In the later stage of wear, the second end 12 contacts the fourth end 22, as shown in FIG. Figure 4 shown.

[0069] However, in actual use of the circuit breaker, the wear conditions of the moving contact assembly 10 and the static contact assembly 20 may be inconsistent. For example, the static contact assembly 20 may be more worn, while the moving contact assembly 10 may be less worn. Therefore, during the use of the circuit breaker, the contact position of the moving contact assembly 10 and the static contact assembly 20, and the contact position of the static contact assembly 20 and the moving contact assembly 10 may not migrate synchronously. However, even if the wear conditions of the moving contact assembly 10 and the static contact assembly 20 are inconsistent, as the contact structure 100 is continuously used, in the later stage of wear, the contact position of the moving contact assembly 10 and the static contact assembly 20 will also migrate to the second end 12 and the fourth end 22.

[0070] In some embodiments, Figure 1 and Figure 4 As shown, the side of the stationary contact assembly 20 facing the moving contact assembly 10 can be tilted so that from the initial use to the wear stage, the distance between the first end 11 and the third end 21 increases, and the distance between the second end 12 and the fourth end 22 decreases.

[0071] The stationary contact assembly 20 is tilted, which can facilitate the setting of a smaller distance between the first end 11 and the third end 21 and a larger distance between the second end 12 and the fourth end 22. Therefore, in the early stage of the use of the contact structure 100, the first end 11 and the third end 21 with a smaller distance are in contact first. As the contact structure 100 wears, the distance between the second end 12 and the fourth end 22 gradually decreases, and in the later stage of wear, the second end 12 can contact the fourth end 22.

[0072] In some embodiments, Figure 1 , Figure 2 and Figure 4As shown, the stationary contact assembly 20 may include a stationary contact 23 and a stationary contact mounting member 24. The stationary contact mounting member 24 has a first mounting surface 241 facing the moving contact assembly 10. The stationary contact 23 is connected to the first mounting surface 241 for contacting the moving contact assembly 10 to achieve closing of the circuit breaker.

[0073] The stationary contact assembly 20 may have different configurations to achieve the tilted configuration of the stationary contact assembly 20. The following three configurations are specifically described as examples:

[0074] Method 1: If Figure 5 As shown, the first mounting surface 241 is arranged at an incline.

[0075] The first mounting surface 241 can provide a mounting position for the stationary contact 23. When the first mounting surface 241 is tilted, the stationary contact 23 itself is tilted on the stationary contact assembly 20. Figure 1 , Figure 4 , the lower end of the first mounting surface 241 is close to the moving contact assembly 10, and the upper end of the first mounting surface 241 is away from the moving contact assembly 10. Therefore, when the stationary contact 23 is mounted on the first mounting surface 241, the distance between the lowermost end of the stationary contact 23 and the moving contact assembly 10 can be made smaller to form the third end 21. At the same time, the distance between the uppermost end of the stationary contact 23 and the moving contact assembly 10 can be made larger to form the fourth end 22. That is, the stationary contact assembly 20 can be tilted toward one side of the moving contact assembly 10 by tilting the mounting position of the stationary contact 23, so that the contact positions of the moving contact assembly 10 and the stationary contact assembly 20 can be migrated as the contact structure 100 wears.

[0076] It should be noted that the first mounting surface 241 may have a first angle α with the first direction X, such as Figure 5 As shown, the first angle α satisfies: 80°≤α≤89°. The first angle α can better match the migration of the contact position within this range. On the one hand, it can avoid the problem of stress concentration at the static contact mounting member 24 when the first angle α is small, thereby preventing the static contact mounting member 24 from being damaged when the moving contact assembly 10 contacts the static contact 23. On the other hand, it can also prevent the problem of the first end 11 and the third end 21 being unable to contact each other in the early stage of use of the contact structure 100 when the first angle α is large. Thereby, the problem of the lower end of the static contact 23 being partially unused can be avoided, thereby improving the utilization rate of the static contact 23.

[0077] Among them, the first angle α can be any value between 80° and 89°, for example, it can be 80°, 81.2°, 86°, 87.9°, 88° or 89°, etc. The specific value of the first angle α is not specifically limited in the embodiment of the present application.

[0078] It should also be noted that the stationary contact 23 needs to have good electrical conductivity and low contact resistance. Generally, it is made of metals such as silver, tungsten, or silver alloys, which are relatively expensive. In the embodiment of the present application, the stationary contact 23 can be tilted by tilting the first mounting surface 241. Compared with directly tilting the stationary contact 23, the material usage of the stationary contact 23 can be saved and the manufacturing cost can be reduced.

[0079] In addition, in the embodiment of the present application, when the moving contact assembly 10 contacts the static contact 23 when the circuit breaker is closed, the inclined first mounting surface 241 also has a force-relieving effect, which can reduce the impact on the static contact assembly 20 .

[0080] Method 2: If Figure 6 As shown, the stationary contact 23 is arranged tilted toward one side of the moving contact assembly 10 .

[0081] The static contact 23 itself can be tilted to achieve the tilted setting of the static contact assembly 20. Specifically, the side of the static contact 23 facing the static contact mounting member 24 is connected to the static contact mounting member 24, and the side of the static contact 23 away from the static contact mounting member 24 can be tilted, so that the static contact 23 forms a trapezoidal structure. That is, the thickness of the lower end of the static contact 23 is larger, and the thickness of the upper end of the static contact 23 is smaller. The distance between the lowermost end of the static contact 23 and the moving contact assembly 10 can be made smaller, and the third end 21 can be formed. At the same time, the distance between the uppermost end of the static contact 23 and the moving contact assembly 10 can also be made smaller, forming the fourth end 22.

[0082] That is, in the embodiment of the present application, the static contact 23 can be made into a trapezoidal structure to realize the inclined setting of the static contact assembly 20 toward one side of the moving contact assembly 10, so that the contact position of the moving contact assembly 10 and the static contact assembly 20 can be migrated as the contact structure 100 wears. Figure 2 , Figure 2 The figure shows the contact conditions of the moving contact assembly 10 and the stationary contact assembly 20 when the contact structure 100 is in the middle stage of wear when the stationary contact 23 is tilted.

[0083] The thickness of the stationary contact 23 refers to the length of the two opposite ends of the stationary contact 23 in the first direction X. For example, the thickness of the lower end of the stationary contact 23 refers to the distance between the two opposite ends of the lower end of the stationary contact 23 in the first direction X. The thickness of the upper end of the stationary contact 23 refers to the distance between the two opposite ends of the upper end of the stationary contact 23 in the first direction X.

[0084] For the sake of convenience, the surface of the stationary contact 23 facing the moving contact 13 is called the first contact surface 231, and the surface of the stationary contact 23 facing away from the moving contact 13 is called the second contact surface 232. Figure 6As shown. The second contact surface 232 is connected to the first mounting surface 241, and a second angle may be provided between the first contact surface 231 and the second contact surface 232. The second angle may be between 1° and 10°, and the second angle may better match the migration of the contact position within this range. On the one hand, it can avoid the problem of stress concentration at the lower end of the static contact 23 when the second angle is small, thereby preventing the static contact mounting member 24 from being damaged when the moving contact assembly 10 contacts the static contact 23. On the other hand, it can also prevent the problem of the first end 11 and the third end 21 being unable to contact each other in the initial use of the contact structure 100 when the second angle is large, thereby preventing the problem of a part of the lower end of the static contact 23 not being utilized, thereby improving the utilization rate of the static contact 23.

[0085] Among them, the second angle can be any value between 1° and 10°, for example, it can be 1°, 1.2°, 1.96°, 6.9°, 7.8°, 8° or 10°, etc. The specific value of the second angle is not specifically limited in the embodiment of the present application.

[0086] Mode three: the first mounting surface 241 is tilted, and the stationary contact 23 is tilted toward one side of the moving contact assembly 10 .

[0087] The description of the inclined setting of the first mounting surface 241 can refer to the relevant description in the first method, and the description of the inclined setting of the static contact 23 toward one side of the moving contact assembly 10 can refer to the relevant description in the second method, which will not be repeated here.

[0088] Some methods of improving the stationary contact assembly 20 are described above, and these methods can achieve that as the contact structure 100 is used, the contact relationship between the moving contact assembly 10 and the stationary contact assembly 20 is migrated from the contact between the first end 11 and the third end 21 to the contact between the second end 12 and the fourth end 22. In addition, the embodiment of the present application can also achieve the above migration by improving the moving contact assembly 100 as follows.

[0089] For example, Figure 1 , Figure 2 As shown, the moving contact assembly 10 may include a moving contact 13, and a surface of the moving contact 13 facing the stationary contact 23 is an arc surface or a parabola.

[0090] Through the above solution, the surface of the moving contact 13 facing the static contact 23 can be made smoother, and when the circuit breaker is closed, the problem of damaging the static contact 23 when the moving contact 13 contacts the static contact 23 can be avoided.

[0091] like Figure 1 , Figure 7 and Figure 8As shown, in some embodiments, the moving contact assembly 10 may further include a moving contact mounting member 14, the moving contact mounting member 14 having a second mounting surface 141 facing the stationary contact assembly 20, the moving contact 13 being connected to the second mounting surface 141, and the elastic member 30 being connected to a side of the moving contact mounting member 14 facing away from the moving contact 13. The second mounting surface 141 is arranged obliquely.

[0092] The second mounting surface 141 can provide a mounting position for the moving contact 13, so that the moving contact 13 can face the stationary contact 23, so that the moving contact 13 contacts the stationary contact 23 to close the circuit breaker. The elastic member 30 is connected to the side of the moving contact mounting member 14 away from the moving contact 13, so as to drive the moving contact 13 to rotate through the moving contact mounting member 14.

[0093] Since the second mounting surface 141 can also be arranged at an incline, in this embodiment, the moving contact 13 is arranged on the inclined surface. Figure 7 , the lower end of the second mounting surface 141 is close to the stationary contact 23, and the upper end of the second mounting surface 141 is away from the stationary contact 23. Therefore, when the movable contact 13 is mounted on the second mounting surface 141, the distance between the lowermost end of the movable contact 13 and the stationary contact 23 can be made smaller to form the first end 11. At the same time, the distance between the uppermost end of the movable contact 13 and the stationary contact 23 can be made larger to form the second end 12.

[0094] That is, in the present application, the moving contact assembly 10 can also be tilted by tilting the installation position of the moving contact 13 , so that the contact positions of the moving contact assembly 10 and the stationary contact assembly 20 can migrate as the contact structure 100 wears.

[0095] It should be noted that in the embodiment of the present application, the second mounting surface 141 can also be tilted while the static contact assembly 20 is tilted toward one side of the moving contact assembly 10, so that the distance between the first end 11 and the third end 21 is smaller and the distance between the second end 12 and the fourth end 22 is larger. In this way, the distance between the first end 11 and the third end 21 increases and the distance between the second end 12 and the fourth end 22 decreases from the initial use stage to the wear stage.

[0096] Of course, the second mounting surface 141 may be tilted separately, that is, when the stationary contact assembly 20 is not tilted toward the moving contact assembly 10 , the second mounting surface 141 may be tilted to adapt to the wear of the contact structure 100 .

[0097] In the embodiment of the present application, the angle between the second mounting surface 141 and the first direction X may also be between 80° and 89°, so as to avoid stress concentration at the movable contact mounting member 14 and improve the utilization rate of the contact structure 100. The angle between the second mounting surface 141 and the first direction X may specifically be 80°, 81.2°, 86°, 87.9°, 88° or 89°, etc. The embodiment of the present application does not specifically limit the specific value of the angle between the second mounting surface 141 and the first direction X.

[0098] In addition, the movable contact assembly 10 can be tilted by improving the movable contact 13. For example, the movable contact 13 can be tilted toward the side of the stationary contact 23. Specifically, the side of the movable contact 13 toward the stationary contact 23 can be parabolic, and the vertex of the parabola is located at the lower end of the movable contact 13, so that the first end 11 is closer to the stationary contact 23.

[0099] In addition, in some embodiments, Figure 1 and Figure 4 As shown, the moving contact assembly 10 may include a moving contact 13 and a moving contact mounting member 14, and the elastic member 30 and the moving contact 13 are connected to opposite sides of the moving contact mounting member 14, so that the elastic member 30 can drive the moving contact 13 to rotate through the moving contact mounting member 14. The moving contact 13 and the moving contact mounting member 14 can be connected in a welding manner.

[0100] In the embodiment of the present application, a mounting groove 142 may be provided on one side of the movable contact mounting member 14 facing the stationary contact assembly 20. Figures 7 to 9 As shown, the movable contact 13 may be provided with a mounting boss 131, and the mounting boss 131 is embedded in the mounting groove 142. In this arrangement, the mounting boss 131 cooperates with the mounting groove 142, and when the movable contact 13 is welded to the movable contact mounting member 14, it is easy to position. In addition, the contact area between the movable contact 13 and the movable contact mounting member 14 can be increased, and the welding strength can be improved. Thus, the problem of loose connection between the movable contact 13 and the movable contact mounting member 14 can be avoided after the circuit breaker is closed and opened multiple times, and the movable contact 13 is prevented from falling, thereby effectively improving the mechanical life of the contact structure 100.

[0101] Alternatively, a mounting protrusion may be provided on the side of the moving contact mounting member 14 facing the stationary contact mounting member 24, and a mounting slot may be provided on the moving contact 13, and the mounting protrusion is embedded in the mounting slot. In this arrangement, the mounting protrusion and the mounting slot may also be matched. When the moving contact 13 is subsequently welded, the welding strength of the moving contact 13 and the moving contact mounting member 14 may also be improved, thereby improving the mechanical life of the contact structure 100.

[0102] It should be noted that the mounting boss 131 and the mounting groove 142 may be arranged in different ways. For example, the mounting boss 131 may be a cuboid boss, and the mounting groove 142 may be a groove with a rectangular cross section, such as Figure 1 , Figure 2 Alternatively, the mounting boss 131 may be a cylindrical boss, and in this case the mounting groove 142 may be a circular countersunk hole, such as Fig. 9 Of course, the mounting boss 131 and the mounting groove 142 may also be in other shapes, which are not specifically limited in the present embodiment of the application, as long as the mounting boss 131 and the mounting groove 142 can match each other.

[0103] Similarly, the mounting protrusions and the mounting slots may also have different configurations, which will not be described in detail in the embodiments of the present application.

[0104] It should also be noted that the number of mounting bosses 131 and mounting grooves 142 can be one or more. For example, two mounting grooves 142 can be arranged at intervals on the moving contact mounting member 14, and two mounting bosses 131 can also be arranged at intervals on the corresponding moving contact 13. When connecting the moving contact 13, the two mounting bosses 131 can be respectively embedded in the two mounting grooves 142, which can further improve the connection strength of the moving contact 13. Of course, the number of mounting bosses 131 and mounting grooves 142 can also be 3 or 4 or other values. The specific number of mounting bosses 131 and mounting grooves 142 is not specifically limited in the embodiments of the present application. Similarly, the number of mounting protrusions and mounting slots can also be one or more, which will not be described in detail in the embodiments of the present application.

[0105] In addition, in some embodiments, Figure 1 , Figure 5 and Figure 6 As shown, the stationary contact assembly 20 may include a stationary contact 23 and a stationary contact mounting member 24. The stationary contact 23 may be connected to the stationary contact mounting member 24 by welding so that the stationary contact 23 contacts the moving contact 13 to achieve closing of the circuit breaker.

[0106] In the embodiment of the present application, a clamping groove is provided on the side of the static contact mounting member 24 facing the moving contact assembly 10, and a clamping boss is provided on the static contact 23, and the clamping boss is embedded in the clamping groove. In this arrangement, when welding the static contact 23 and the static contact mounting member 24, it is easy to position. In addition, the contact area between the static contact 23 and the static contact mounting member 24 can be increased, and the welding strength can be improved. Thereby, the problem of loose connection between the static contact 23 and the static contact mounting member 24 can be avoided after the circuit breaker is closed and opened multiple times, and the static contact 23 is prevented from falling, thereby effectively improving the mechanical life of the contact structure 100.

[0107] Alternatively, a clamping protrusion is provided on the side of the static contact mounting member 24 facing the moving contact assembly 10, and a clamping slot is provided on the static contact 23, and the clamping protrusion is embedded in the clamping slot. In this way, the clamping protrusion and the clamping slot can also be matched. When the static contact 23 is subsequently welded, the welding strength of the static contact 23 and the static contact mounting member 24 can also be improved, thereby improving the mechanical life of the contact structure 100.

[0108] It should be noted that the snap-fitting boss and the snap-fitting groove can have different settings. For example, the snap-fitting boss can be a cuboid boss, in which case the snap-fitting groove can be a groove with a rectangular cross-section. Alternatively, the snap-fitting boss can also be a cylindrical boss, in which case the snap-fitting groove can be a circular countersunk hole. Of course, the snap-fitting boss and the snap-fitting groove can also be other shapes, which are not specifically limited in the embodiments of the present application, as long as the snap-fitting boss and the snap-fitting groove can cooperate. Similarly, the snap-fitting protrusion and the snap-fitting groove can also have different settings, which are not described in detail in the embodiments of the present application.

[0109] It should also be noted that the number of the snap-in bosses and the snap-in grooves can be one or more. For example, two snap-in grooves can be spaced apart on the stationary contact mounting member 24, and two snap-in bosses can be spaced apart on the corresponding stationary contact 23. When connecting the stationary contact 23, the two snap-in bosses can be respectively embedded in the two snap-in grooves, which can further improve the connection strength of the stationary contact 23. Of course, the number of the snap-in bosses and the snap-in grooves can also be 3 or 4 or other values, etc. The specific number of the snap-in bosses and the snap-in grooves is not specifically limited in the embodiments of the present application. Similarly, the number of the snap-in protrusions and the snap-in grooves can also be one or more, which will not be described in detail in the embodiments of the present application.

[0110] In addition, in some embodiments, Figure 7 , Figure 8 and Fig. 9 As shown, a mounting boss 143 may be provided on the second mounting surface 141, and the movable contact 13 is connected to the mounting boss 143. An arc-starting inclined surface 144 is provided between a side of the mounting boss 143 facing the stationary contact assembly 20 and the second mounting surface 141.

[0111] The moving contact 13 is connected to the moving contact mounting member 14 via the mounting boss 143. Since an arc-striking slope 144 is provided between the side of the mounting boss 143 facing the stationary contact assembly 20 and the second mounting surface 141, the arc can be guided by the arc-striking slope 144. Specifically, when the circuit breaker is opened, an arc will be generated between the stationary contact 23 and the moving contact 13, and the arc can move quickly along the arc-striking slope 144, which is conducive to reducing the erosion of the moving contact 13 and the stationary contact 23 by the arc.

[0112] It should be noted that, when the movable contact mounting member 14 is provided with a mounting groove 142 and the movable contact 13 is provided with a mounting boss 131, the mounting groove 142 can be provided on the assembly boss 143. When the movable contact mounting member 14 is provided with a mounting protrusion and the movable contact 13 is provided with a mounting slot, the mounting protrusion can be provided on the assembly boss 143.

[0113] In addition, in some embodiments, the circuit breaker may include an arc extinguishing chamber, and when the circuit breaker is closed, the contact position of the moving contact assembly 10 and the static contact assembly 20 is opposite to the arc extinguishing chamber. The arc striking slope 144 is located on the side of the assembly boss 143 close to the arc extinguishing chamber.

[0114] The circuit breaker includes an arc extinguishing chamber, which can quickly extinguish arcs and suppress current to prevent arc damage to the contact structure 100 or other components in the circuit breaker. When an arc is generated when the moving contact 13 and the static contact 23 are separated, the arc can move to the arc extinguishing chamber and be extinguished by the arc extinguishing chamber.

[0115] Since the arc-striking slope 144 is located on the side of the assembly boss 143 close to the arc-extinguishing chamber, when an arc is generated, the arc-striking slope 144 can guide the arc to move toward the arc-extinguishing chamber, which is beneficial to the rapid extinction of the arc and improves the breaking performance of the circuit breaker.

[0116] It should be noted that the assembly boss 143 can be a rectangular boss. In this case, a chamfer can be set on a surface of the assembly boss 143 facing the arc extinguishing chamber, and the chamfer can be extended to the second mounting surface 141. The surface formed after the chamfer can form the arc-striking slope 144.

[0117] In the embodiment of the present application, the contact structure 100 also includes an elastic member 30, which is connected to the side of the moving contact assembly 10 facing away from the static contact assembly 20. The elastic member 30 can provide a driving force for the moving contact assembly 10 so that the moving contact assembly 10 can rotate relative to the static contact assembly 20, so that when the circuit breaker is closed, the moving contact assembly 10 and the static contact assembly 20 can contact each other at different positions.

[0118] When the circuit breaker is closed and the contact structure 100 is in the initial stage of use, the first end 11 can contact the third end 21 to achieve the connection of the circuit breaker. As the circuit breaker is used, when the contact structure 100 is worn, the elastic member 30 can push the contact assembly 10 so that the moving contact assembly 10 can continue to rotate and re-contact the stationary contact assembly 20 until the second end 12 contacts the fourth end 22.

[0119] That is, the movable contact assembly 10 proposed in the present application can rotate according to the wear of the contact structure 100, so that the contact position of the movable contact assembly 10 and the stationary contact assembly 20 is migrated, and the movable contact assembly 10 and the stationary contact assembly 20 are kept in good contact. In this way, it is possible to avoid the situation that after the contact structure 100 is worn, the movable contact assembly 10 and the stationary contact assembly 20 are separated when the circuit breaker is closed, resulting in the circuit breaker not being able to work normally, thereby improving the service life of the circuit breaker.

[0120] In addition, the present application also proposes a circuit breaker, which includes the contact structure 100 in any one of the above embodiments.

[0121] In a circuit breaker provided with the above-mentioned contact structure 100, the arrangement of the moving contact assembly 10, the stationary contact assembly 20 and the elastic member 30 can make the contact positions of the moving contact assembly 10 and the stationary contact assembly 20 move accordingly when the contact structure 100 is worn, thereby ensuring that the contact assembly and the stationary contact assembly 20 can also be in good contact after the contact structure 100 is worn, which can improve the utilization rate of the moving contact 13 and the stationary contact 23, and thus can improve the service life of the circuit breaker.

Claims

1. A contact structure, applied to a circuit breaker, characterized in that: The contact structure comprises a moving contact assembly, a stationary contact assembly and an elastic member, wherein the moving contact assembly cooperates with the stationary contact assembly, and the elastic member is connected to a side of the moving contact assembly facing away from the stationary contact assembly; The side of the moving contact assembly facing the stationary contact assembly has a first end and a second end opposite to each other, and the side of the stationary contact assembly facing the moving contact assembly has a third end and a fourth end opposite to each other; When the circuit breaker is closed and the contact structure is in the initial use stage, the first end contacts the third end; When the circuit breaker is closed and the contact structure is in the wear stage, the elastic member releases elastic potential energy and pushes the moving contact assembly, so that the contact relationship between the moving contact assembly and the static contact assembly migrates from the first end contacting the third end to the second end contacting the fourth end.

2. The contact structure according to claim 1, characterized in that: The stationary contact assembly is tilted toward one side of the moving contact assembly, so that from the initial use stage to the wear stage, the distance between the first end and the third end increases, and the distance between the second end and the fourth end decreases.

3. The contact structure according to claim 2, characterized in that: The stationary contact assembly comprises a stationary contact and a stationary contact mounting member, wherein the stationary contact mounting member has a first mounting surface facing the moving contact assembly, and the stationary contact is connected to the first mounting surface; The first mounting surface is arranged obliquely; and / or, The stationary contact is arranged to be inclined toward one side of the moving contact assembly.

4. The contact structure according to claim 2 or 3, characterized in that: The moving contact assembly comprises a moving contact, and a surface of the moving contact facing the stationary contact is an arc surface or a parabola.

5. The contact structure according to claim 4, characterized in that: The moving contact assembly further comprises a moving contact mounting member, wherein the moving contact mounting member has a second mounting surface facing the stationary contact assembly, the moving contact is connected to the second mounting surface, and the elastic member is connected to a side of the moving contact mounting member facing away from the moving contact; The second mounting surface is arranged inclined.

6. The contact structure according to claim 1, characterized in that: The moving contact assembly includes a moving contact and a moving contact mounting member, and the elastic member and the moving contact are connected to opposite sides of the moving contact mounting member; The movable contact mounting piece is provided with a mounting groove on one side facing the stationary contact assembly, and the movable contact is provided with a mounting boss, which is embedded in the mounting groove; Alternatively, a mounting protrusion is provided on a side of the moving contact mounting piece facing the static contact mounting piece, a mounting slot is provided on the moving contact, and the mounting protrusion is embedded in the mounting slot.

7. The contact structure according to claim 1, characterized in that: The stationary contact assembly comprises a stationary contact and a stationary contact mounting member; A clamping groove is provided on one side of the stationary contact mounting piece facing the moving contact assembly, and a clamping boss is provided on the stationary contact, and the clamping boss is embedded in the clamping groove; Alternatively, a clamping protrusion is provided on a side of the stationary contact mounting piece facing the moving contact assembly, a clamping slot is provided on the stationary contact, and the clamping protrusion is embedded in the clamping slot.

8. The contact structure according to claim 5, characterized in that: The second mounting surface is provided with an assembly boss, and the moving contact is connected to the assembly boss; An arc-striking inclined surface is provided between a side of a portion of the assembly boss facing the stationary contact assembly and the second mounting surface.

9. The contact structure according to claim 8, characterized in that: The circuit breaker comprises an arc extinguishing chamber, and when the circuit breaker is closed, the contact position of the moving contact assembly and the static contact assembly is opposite to the arc extinguishing chamber; The arc-striking inclined surface is located on a side of the assembly boss close to the arc-extinguishing chamber.

10. A circuit breaker, characterized in that: The circuit breaker comprises the contact structure according to any one of claims 1 to 9.

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