Contact structure and vacuum circuit breaker

Abstract

The invention relates to a contact structure and a vacuum circuit breaker, the contact structure comprises a moving contact and a static contact, and the moving contact is configured to move relative to the static contact along a first direction so as to switch between a contact closing position and a contact opening position. The moving contact comprises a first contact cup, a first conductive rod and a first elastic piece. The first elastic member is configured to be capable of generating elastic deformation along a first direction and is connected with the first conductive rod along the first direction. According to the contact structure, the moving contact is provided with the first elastic piece, and the first elastic piece can deform in the first direction and is matched with the first conductive rod. Therefore, the elastic piece reasonably disperses the mechanical stress generated when the contact structure is opened and closed, so that the instantaneous force generated along the first direction at the moment of opening and closing of the contact structure is slowly released, the negative influence of the instantaneous force on the contact cup is weakened, the probability that the cup wall of the contact cup deforms due to stress is reduced, and the structural strength of the contact structure is improved.

Description

Technical Field

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

[0002] In order to meet the needs of the power industry to gradually reduce or even ban the use of SF6 gas, vacuum circuit breakers have received widespread attention as an environmentally friendly and efficient alternative. In related technologies, contact design mainly relies on transverse magnetic and longitudinal magnetic control technology to stabilize the arc and reduce arc erosion of the contacts. The transverse magnetic contact drives the arc to rotate between the poles through the transverse magnetic field, slowing down the local erosion of the contact surface. The longitudinal magnetic field generated by the longitudinal magnetic contact can maintain the diffusion state of the arc, reduce the arc voltage and arc energy, and thus improve the opening and closing efficiency. This longitudinal magnetic contact technology performs better in high-voltage vacuum circuit breakers.

[0003] In the related art, there are two main structures of longitudinal magnetic contacts: coil type and cup type. Although the coil type contact can provide a stronger longitudinal magnetic field and improve the opening and closing ability, it has a large resistance, serious heat generation, and the residual magnetism problem may affect the fast opening and closing ability of the circuit breaker. Therefore, there are limitations when opening and closing large currents. Relatively speaking, the cup-shaped longitudinal magnetic contact has a simple structure, a shorter current path, and a smaller resistance. However, although the cup-shaped longitudinal magnetic contact has good mechanical strength and can better cope with the impact force when the contact is closed, the instantaneous force generated when the contact is opened and closed may still have a negative impact on the cup-shaped longitudinal magnetic contact and reduce its structural strength. Summary of the invention

[0004] Based on this, it is necessary to provide a contact structure and a vacuum circuit breaker that can reduce the impact of instantaneous force during opening and closing to address the above-mentioned problems.

[0005] A contact structure, comprising a moving contact and a stationary contact, wherein the moving contact is configured to be movable relative to the stationary contact along a first direction to switch between a contact closing position and a contact opening position; the moving contact comprises:

[0006] First contact cup;

[0007] A first conductive rod, passing through the first contact cup; and

[0008] The first elastic member is configured to be elastically deformable along the first direction and connected to the first conductive rod along the first direction.

[0009] In one of the embodiments, the moving contact further includes a reverse contact cup, and the reverse contact cup is disposed in the first contact cup.

[0010] In one embodiment, the reverse contact cup includes a movable reverse contact cup, which can move in the first contact cup along the first direction, and the first conductive rod is passed through the movable reverse contact cup; the moving contact also includes a second elastic member, which is arranged on the first side of the movable reverse contact cup in the first direction and cooperates with the movable reverse contact cup.

[0011] In one of the embodiments, the movable contact further includes a third elastic member, which is disposed on a second side of the movable reverse contact cup in the first direction and cooperates with the movable reverse contact cup.

[0012] In one embodiment, at least one of the first elastic member, the second elastic member and the third elastic member is a spring;

[0013] And / or, at least one of the first elastic member, the second elastic member and the third elastic member is configured to be in a natural state when the moving contact is located at the contact-off position.

[0014] In one of the embodiments, a first limiting structure and a second limiting structure are provided in the first contact cup, the first limiting structure and the second limiting structure are spaced apart in the first direction, and are respectively located on both sides of the movable reverse contact cup in the first direction; the second elastic member is provided on a side of the first limiting structure facing the movable reverse contact cup, and the third elastic member is provided on a side of the second limiting structure facing the movable reverse contact cup.

[0015] In one of the embodiments, the moving contact further includes at least two layers of the reverse contact cups.

[0016] In one embodiment, the first conductive rod includes a first rod segment and a second rod segment, the first elastic member is disposed between the first rod segment and the second rod segment, and the first rod segment and the second rod segment are connected at two ends in the first direction respectively.

[0017] In one of the embodiments, the stationary contact includes a second contact cup and a magnetic field focusing ring, and the magnetic field focusing ring is disposed in the second contact cup.

[0018] A vacuum circuit breaker comprises the above-mentioned contact structure.

[0019] In the above-mentioned contact structure and vacuum circuit breaker, the movable contact is provided with a first elastic member, and the first elastic member can be deformed along the first direction and cooperate with the first conductive rod. In this way, the elastic member reasonably disperses the mechanical stress generated when the contact structure is opened and closed, so that the instantaneous force generated along the first direction at the moment of opening and closing of the contact structure is slowly released, weakening its negative impact on the cup wall of the contact cup, reducing the probability of the cup wall of the contact cup being deformed by force, and increasing the structural strength of the contact structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 Schematic diagram of the structure of the contact in one embodiment of the present application.

[0022] Figure 2 for Figure 1 The cross-sectional structure diagram of the contact structure shown is at AA.

[0023] Figure 3 for Figure 1 The contact structure shown is a schematic cross-sectional structure diagram of the contact structure in the closed stage during the opening and closing process.

[0024] Figure 4 for Figure 1 The cross-sectional structure diagram of the contact structure shown is in the initial stage of opening and closing process.

[0025] Figure 5 for Figure 1 The cross-sectional structure diagram of the contact structure shown is in the disconnection stage during the opening and closing process.

[0026] Explanation of the accompanying drawings: 100, contact structure; 10, moving contact; 11, first contact cup; 111, first limiting structure; 112, second limiting structure; 12, first conductive rod; 121, first rod segment; 122, second rod segment; 131, first elastic member; 132, second elastic member; 133, third elastic member; 14, first contact piece; 15, reverse contact cup; 151, movable reverse contact cup; 152, fixed reverse contact cup; 30, static contact; 31, second contact cup; 32, second conductive rod; 33, second contact piece; 34, magnetic focusing ring; 50, arc area; 70, welding area. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0028] In the description of the present application, it should be understood that if 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", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply 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.

[0029] In addition, if the term "and / or" appears, "and / or" is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can represent: 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 objects associated before and after are in an "or" relationship. If the terms "first" and "second" appear, these terms are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "multiple" appears, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0030] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0031] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0032] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0033] As described in the background technology, compared with SF6 gas, vacuum circuit breakers use vacuum environment to achieve arc extinguishing, and have the advantages of fast dielectric recovery, simple operation and maintenance, and environmental friendliness, especially in the medium voltage field, they have occupied a dominant position. In order to expand the application of vacuum circuit breakers in the field of high voltage and high current, new design concepts and structures are constantly emerging, especially in the contact structure 100, more advanced control technology needs to be adopted to cope with the problem of increasing difficulty in controlling vacuum arcs. In high voltage applications, vacuum circuit breakers require a larger inter-pole spacing to meet insulation requirements, which will lead to the emergence of aspect ratio vacuum arcs, and put forward higher requirements for its control, and thus give rise to transverse magnetic and longitudinal magnetic control technologies to stabilize the arc. Among them, with the increase in the requirements for opening and closing capabilities, large-angle cup-shaped longitudinal magnetic contacts came into being. Their design enhances the magnetic field by increasing the current path, but it also brings a series of challenges, such as reduced strength of the contact structure 100, problems with heat conduction paths, etc. In order to overcome these problems, the contact structure 100 must find a balance between magnetic field enhancement and structural strength, thermal management, etc.

[0034] See also Figure 1 and Figure 2A contact structure 100 provided in an embodiment of the present application includes a moving contact 10 and a stationary contact 30. The moving contact 10 is configured to be able to move relative to the stationary contact 30 along a first direction to switch between a contact closed position and a contact open position. The moving contact 10 includes a first contact cup 11, a first conductive rod 12, and an elastic member. The elastic member includes a first elastic member 131. The first elastic member 131 is configured to be able to undergo elastic deformation along a first direction and connect to the first conductive rod 12 along the first direction.

[0035] In one embodiment, the contact structure 100 is used for a vacuum circuit breaker. It can be understood that the contact structure 100 can be a cup-shaped longitudinal magnetic contact. In order to achieve its normal function, the moving contact 10 also includes a first contact piece 14, the stationary contact 30 includes a second contact cup 31, a second conductive rod 32 and a second contact piece 33, and a spiral groove can be provided on the cup wall of the first contact cup 11 and the second contact cup 31. When the moving contact 10 is in the contact closing position, the contact structure 100 is in a closed state, and the first contact piece 14 of the moving contact 10 is in contact with the second contact piece 33 of the stationary contact 30; when the moving contact 10 is in the contact opening position, the contact structure 100 is in an opening state, and the first contact piece 14 of the moving contact 10 is separated from the second contact piece 33 of the stationary contact 30.

[0036] The first elastic member 131 is connected to the first conductive rod 12 along the first direction, and its elastic deformation in the first direction is related to the movement of the first conductive rod 12 in the first direction. In other words, the movement of the first conductive rod 12 in the first direction can cause the deformation of the first elastic member 131 to convert part of its kinetic energy into elastic potential energy. The first elastic member 131 can be arranged at one end of the first conductive rod 12 in the first direction, or the first conductive rod 12 is divided into at least two rod segments, and the elastic member is arranged between the two rod segments. It only needs to be able to generate elastic deformation and react to the first conductive rod 12 when the first conductive rod 12 moves.

[0037] Please also read Figures 3 to 5, the solid arrow in the figure indicates the current path, and the dotted arrow indicates pressure / tension / buffer. Specifically, the first elastic member 131 can be configured to be in a natural state when the moving contact 10 is in the contact opening position. When the moving contact 10 moves to the contact closing position and closes, the first conductive rod 12 is subjected to a force in the first direction toward the static contact 30. At this time, the first elastic member 131 is subjected to pressure and is compressed accordingly to reduce the force between the first conductive rod 12 and the first contact cup 11 and the first contact piece 14. When the moving contact 10 moves to the contact opening position and is in the initial separation stage, the first conductive rod 12 is subjected to a force in the first direction away from the static contact 30. At this time, the first elastic member 131 is subjected to tension and is stretched accordingly, which can also reduce the force between the first conductive rod 12 and the first contact cup 11 and the first contact piece 14. When the moving contact 10 is completely separated from the static contact 30, an arc region 50 is formed between the two, and after reaching the contact opening position, the first elastic member 131 can be restored to the natural state again.

[0038] In the above-mentioned contact structure 100, the movable contact 10 is provided with a first elastic member 131, and the first elastic member 131 can be deformed along the first direction and cooperate with the first conductive rod 12. The elastic member can reasonably absorb and disperse the mechanical stress generated when the contact structure 100 is opened and closed, so that the instantaneous force generated along the first direction at the moment of opening and closing of the contact structure 100 is slowly released, weakening its negative impact on the cup wall of the contact cup, reducing the probability of the cup wall of the contact cup being deformed by force, and increasing the structural strength of the contact structure 100.

[0039] Specifically, when the contact structure 100 is closed, the moving contact 10 and the static contact 30 will be subjected to greater pressure, and when the contact structure 100 is disconnected, the moving contact 10 and the static contact 30 will be subjected to tension. The elastic member can reduce the impact caused by the opening and closing process by its own compression or stretching deformation when the contact structure 100 is opened and closed. Among them, in the initial stage of disconnection of the contact structure 100, since the largest heat source in the contact structure 100 is located at the contact piece, and the poor thermal conductivity of the vacuum environment is likely to cause the internal temperature of the contact structure 100 to be high, so that the contact material softens, which may cause the surface of the moving and static contacts 30 to weld, forming a weld area 70, and the moving contact 10 and the static contact 30 The contact pieces may not be effectively separated due to the welding phenomenon. At this time, the elastic member can slowly stretch and release the elastic force to share the tension on the cup wall of the contact cup, reduce the probability of the cup wall of the contact cup being deformed by force, and enhance the structural strength of the contact.

[0040] In some embodiments, the first conductive rod 12 includes a first rod segment 121 and a second rod segment 122 , the first elastic member 131 is disposed between the first rod segment 121 and the second rod segment 122 , and the two ends in the first direction respectively connect the first rod segment 121 and the second rod segment 122 .

[0041] Specifically, one end of the first rod segment 121 away from the second rod segment 122 forms one end of the first conductive rod 12 close to the first contact piece 14, and one end of the second rod segment 122 away from the first rod segment 121 forms one end of the first conductive rod 12 away from the first contact piece 14. In the opening and closing process of the contact structure 100, the end of the first rod segment 121 away from the second rod segment 122 may abut against the first contact piece 14.

[0042] In this way, the first elastic member 131 is disposed between the first rod segment 121 and the second rod segment 122, that is, the first conductive rod 12 as a whole can be expanded and contracted by the elastic deformation of the first elastic member 131 in the first direction. During the opening and closing process of the contact structure 100, the first elastic member 131 can absorb and disperse the force transmitted by the first conductive rod 12, thereby relieving the internal stress of the contact structure 100 and reducing the probability of its deformation.

[0043] In some embodiments, the movable contact 10 further includes a reverse contact cup 15, which is disposed in the first contact cup 11. It can be understood that a spiral groove is configured on the reverse contact cup 15, and the spiral groove thereof is opposite to the spiral groove of the first contact cup 11.

[0044] The reverse contact cup 15 is embedded in the first contact cup 11, and the first conductive rod 12 can be inserted into the reverse contact cup 15. The two are in contact but not fixed, that is, the first conductive rod 12 can move relative to the reverse contact cup 15, and there is friction between the two.

[0045] In this way, the reverse contact cup 15 can help the contact structure 100 generate a larger longitudinal magnetic field, and weaken the residual magnetism when the current passes through zero, thereby achieving effective control of the vacuum arc, improving the uneven longitudinal magnetic field at the edge of the contact, reasonably distributing the magnetic flux, optimizing the magnetic field distribution, and controlling the arc path. In addition, during the opening and closing process of the contact structure 100, the reverse contact cup 15 can generate friction resistance to the first conductive rod 12, which also helps to disperse mechanical stress. The reverse contact cup 15 of the first conductive rod 12 is embedded in the first contact cup 11, and can also support the first contact cup 11 to enhance its structural strength.

[0046] Furthermore, the moving contact 10 also includes at least two layers of reverse contact cups 15 .

[0047] In this way, the multi-layer reverse contact cup 15 helps to reasonably distribute the magnetic flux and control the arc path, thereby optimizing the magnetic field distribution and greatly weakening the residual magnetism in the arc region between the contacts when the current passes through zero.

[0048] In some embodiments, the reverse contact cup 15 includes a movable reverse contact cup 151, the movable reverse contact cup 151 can move in the first direction inside the first contact cup 11, and the first conductive rod 12 is inserted through the movable reverse contact cup 151. The elastic member also includes a second elastic member 132, the second elastic member 132 is disposed on a first side of the movable reverse contact cup 151 in the first direction, and cooperates with the movable reverse contact cup 151.

[0049] It can be understood that the elastic member may include a plurality of second elastic members 132, and the cooperation mode between the elastic member 132 and the movable reverse contact cup 151 may be, but not limited to, fixed connection, abutment, etc. The movable reverse contact cup 151 can move along the first direction driven by the first conductive rod 12. Specifically, the force of the first conductive rod 12 driving the movable reverse contact cup 151 may be the friction force between the two.

[0050] In this way, during the opening and closing process of the contact structure 100, the movable reverse contact cup 151 will also move, and the second elastic member 132 can absorb the force between the movable reverse contact cup 151 and the first contact cup 11, thereby indirectly transferring and dispersing the force to various locations of the first contact cup 11, reducing stress concentration, and thereby improving the structural strength of the contact structure 100.

[0051] Furthermore, the elastic member further includes a third elastic member 133 . The third elastic member 133 is disposed on the second side of the movable reverse contact cup 151 in the first direction and cooperates with the movable reverse contact cup 151 .

[0052] It can be understood that the elastic member may include a plurality of third elastic members 133, and the cooperation mode between the elastic member and the movable reverse contact cup 151 may be, but is not limited to, fixed connection, abutment, etc. The movable contact 10 is provided with at least three layers of elastic members including a first elastic member 131, a second elastic member 132 and a third elastic member 133.

[0053] In this way, the third elastic member 133 and the second elastic member 132 can absorb the force of the movable reverse contact cup 151 from both sides respectively, and disperse the force to different areas, which helps to further reduce stress concentration.

[0054] In some embodiments, the first contact cup 11 has a first limiting structure 111 and a second limiting structure 112, the first limiting structure 111 and the second limiting structure 112 are arranged at intervals in the first direction, and are respectively located on both sides of the movable reverse contact cup 151 in the first direction. The second elastic member 132 is arranged on the side of the first limiting structure 111 facing the movable reverse contact cup 151, and the third elastic member 133 is arranged on the side of the second limiting structure 112 facing the movable reverse contact cup 151.

[0055] It can be understood that the area between the first limiting structure 111 and the second limiting structure 112 is the movable area of ​​the movable reverse contact cup 151, that is, the movable reverse contact cup 151 moves between the first limiting structure 111 and the second limiting structure 112. Specifically, the first limiting structure 111 and the second limiting structure 112 can be clamping rings protruding from the inner wall of the first contact cup 11, and are respectively limited at the two ends of the moving path of the movable reverse contact cup 151.

[0056] In this way, the first limiting structure 111 and the second limiting structure 112 can limit the moving range of the movable reverse contact cup 151 on the one hand, and can also provide installation positions for the second elastic member 132 and the third elastic member 133 on the other hand, so that the second elastic member 132 and the third elastic member 133 can cooperate with the movable reverse contact cup 151 from both sides respectively, and transfer and disperse the stress.

[0057] In some embodiments, the reverse contact cup 15 further includes a fixed reverse contact cup 152 , which is fixed in the first contact cup 11 , the first rod segment 121 passes through the movable reverse contact cup 151 , and the second rod segment 122 passes through the fixed reverse contact cup 152 .

[0058] It can be understood that the reverse contact cup 15 includes at least two layers of reverse contact cups 15, including a movable reverse contact cup 151 and a fixed reverse contact cup 152, and the two layers of reverse contact cups 15 are sequentially arranged in the first direction in the first contact cup 11. The fixed reverse contact cup 152 is fixedly embedded in the first contact cup 11 and cannot be driven by the first conductive rod 12.

[0059] In this way, the fixed reverse contact cup 152 can provide a buffering effect through the friction between it and the second rod segment 122 , and the second rod segment 122 can drive the movable reverse contact cup 151 to move, and then be buffered by the second elastic member 132 and the third elastic member 133 .

[0060] In some embodiments, at least one of the first elastic member 131 , the second elastic member 132 , and the third elastic member 133 is a spring.

[0061] It can be understood that the first elastic member 131 , the second elastic member 132 and the third elastic member 133 can all be metal springs, and specifically can be made of ferromagnetic materials.

[0062] In this way, the spring can increase the heat dissipation area and improve the internal heat dissipation efficiency of the contact structure 100 .

[0063] In some embodiments, at least one of the first elastic member 131, the second elastic member 132 and the third elastic member 133 is configured to be in a natural state when the moving contact 10 is located at the contact disconnection position. It can be understood that the natural state means that the elastic member is neither compressed nor stretched.

[0064] In this way, when the movable contact 10 moves to the contact closing position and closes, the first conductive rod 12 is subjected to a force in the first direction toward the static contact 30. At this time, the first elastic member 131 and the second elastic member 132 are subjected to pressure and are compressed accordingly, and the third elastic member 133 is subjected to tension and is stretched accordingly, so as to reduce the force between the first conductive rod 12 and the first contact cup 11 and the first contact piece 14. When the movable contact 10 moves to the contact opening position and is in the initial opening stage, the first conductive rod 12 is subjected to a force in the first direction away from the static contact 30. At this time, the first elastic member 131 and the second elastic member 132 are subjected to tension and are stretched accordingly, and the third elastic member 133 is subjected to pressure and is compressed accordingly, which can also reduce the force between the first conductive rod 12 and the first contact cup 11 and the first contact piece 14. After the movable contact 10 is completely separated from the static contact 30 and reaches the contact opening position, the first elastic member 131, the second elastic member 132 and the third elastic member 133 can be restored to the natural state again.

[0065] In some embodiments, the static contact 30 further includes a magnetic field focusing ring 34, and the magnetic field focusing ring 34 is disposed in the second contact cup 31. It can be understood that the magnetic field focusing ring 34 is made of ferromagnetic material and is embedded in the second contact cup 31.

[0066] In this way, the magnetic focusing ring 34 can optimize the magnetic field distribution of the contact structure 100, control the arc path, and improve the uneven longitudinal magnetic field distribution at the edge of the contact.

[0067] Maxwell simulation software was used to simulate the inter-pole magnetic field of the above contact structure 100 and the common longitudinal magnetic contact structure 100 in the related art (contact size, material, etc. follow the control variable method). The longitudinal magnetic results of the anode surface, cathode surface and inter-pole center plane of the two contact structures 100 were compared, as shown in the following table:

[0068]

[0069] It can be seen from the simulation results that the embedded magnetic focusing ring 34 and the double-layer reverse contact cup 15 of the contact structure 100 reasonably distribute the magnetic flux, effectively control the arc path, thereby optimizing the magnetic field distribution and greatly weakening the residual magnetism in the arc area between the contacts when the current passes through zero.

[0070] In the above-mentioned contact structure 100, the static contact 30 has a built-in magnetic field ring 34, and the moving contact 10 has at least two layers of reverse contact cups 15 embedded therein and at least three layers of spring structures are provided at the same time. The contact structure 100 increases the current flow path and the heat conduction path by means of the built-in multi-layer spring structure, and provides sufficient pulling force or buffering when the contact surface is welded when the circuit breaker contacts are opened or closed, and converts the force between the contacts to between the spring and the clamping ring, thereby achieving the effect of enhancing the strength of the contact structure 100 and extending the life of the contact. In other words, the introduction of the multi-layer spring structure provides a new idea for balancing the magnetic field enhancement with the strength and thermal management of the contact structure 100. By reasonably dispersing the mechanical stress generated when the circuit breaker is opened and closed, while enhancing the thermal conductivity and the heat dissipation capacity of the current flow, the contact welding phenomenon caused by excessive temperature rise is avoided. This design not only optimizes the opening and closing performance of the contact structure 100, but also significantly improves the overall reliability and life of the equipment. In addition, through the multi-level control strategies such as the magnetic focusing ring 34 and the reverse contact cup 15, a larger longitudinal magnetic field is generated during the opening and closing process of the contact structure 100 and the residual magnetism when the current passes through zero is weakened, thereby achieving effective control of the vacuum arc, improving the uneven longitudinal magnetic field at the edge of the contact, reasonably distributing the magnetic flux, optimizing the magnetic field distribution, and controlling the arc path. In this way, the application potential of the vacuum circuit breaker in high-current opening and closing has been further developed, which is conducive to its application in higher voltage levels and more severe working conditions.

[0071] The present application also provides a vacuum circuit breaker, comprising the above-mentioned contact structure 100 .

[0072] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0073] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A contact structure, characterized in that: The contact structure comprises a moving contact (10) and a stationary contact (30); the moving contact (10) is configured to be movable relative to the stationary contact (30) along a first direction so as to switch between a contact closed position and a contact open position; the moving contact (10) comprises: A first contact cup (11); A first conductive rod (12) is inserted into the first contact cup (11); and The first elastic member (131) is configured to be elastically deformable along the first direction and connected to the first conductive rod (12) along the first direction.

2. The contact structure according to claim 1, characterized in that: The moving contact (10) further comprises a reverse contact cup (15), wherein the reverse contact cup (15) is arranged in the first contact cup (11).

3. The contact structure according to claim 2, characterized in that: The reverse contact cup (15) comprises a movable reverse contact cup (151), the movable reverse contact cup (151) being movable in the first contact cup (11) along the first direction, and the first conductive rod (12) being inserted through the movable reverse contact cup (151); the movable contact (10) further comprises a second elastic member (132), the second elastic member (132) being arranged on a first side of the movable reverse contact cup (151) in the first direction and cooperating with the movable reverse contact cup (151).

4. The contact structure according to claim 3, characterized in that: The movable contact (10) further comprises a third elastic member (133), wherein the third elastic member (133) is arranged on the second side of the movable reverse contact cup (151) in the first direction and cooperates with the movable reverse contact cup (151).

5. The contact structure according to claim 4, characterized in that: At least one of the first elastic member (131), the second elastic member (132) and the third elastic member (133) is a spring; And / or, at least one of the first elastic member (131), the second elastic member (132) and the third elastic member (133) is configured to be in a natural state when the moving contact (10) is located in the contact disconnection position.

6. The contact structure according to claim 4, characterized in that: The first contact cup (11) has a first limiting structure (111) and a second limiting structure (112) therein; the first limiting structure (111) and the second limiting structure (112) are arranged at intervals in the first direction and are respectively located on two sides of the movable reverse contact cup (151) in the first direction; the second elastic member (132) is arranged on a side of the first limiting structure (111) facing the movable reverse contact cup (151); and the third elastic member (133) is arranged on a side of the second limiting structure (112) facing the movable reverse contact cup (151).

7. The contact structure according to claim 2, characterized in that: The moving contact (10) further comprises at least two layers of the reverse contact cups (15).

8. The contact structure according to claim 1, characterized in that: The first conductive rod (12) comprises a first rod segment (121) and a second rod segment (122); the first elastic member (131) is arranged between the first rod segment (121) and the second rod segment (122), and the first rod segment (121) and the second rod segment (122) are respectively connected at two ends in the first direction.

9. The contact structure according to any one of claims 1 to 8, characterized in that: The stationary contact (30) comprises a second contact cup (31) and a magnetic field focusing ring (34); the magnetic field focusing ring (34) is arranged in the second contact cup (31).

10. A vacuum circuit breaker, characterized in that: The invention comprises a contact structure as claimed in any one of claims 1 to 9.

Images