Vacuum circuit breaker contacts and vacuum circuit breaker

Abstract

The application relates to a vacuum circuit breaker contact and a vacuum circuit breaker. The vacuum circuit breaker contact comprises a contact part, the contact part comprising a contact piece and a contact cup, the contact piece being arranged on an opening of the contact cup; a limiting structure arranged in the contact part, the limiting structure being configured to abut against the contact piece in the axial direction of the vacuum circuit breaker contact, and the limiting structure being further configured to limit the movement of the contact piece away from the contact cup; and a conductive rod connected with the contact part. Thus, the vacuum circuit breaker contact according to the application is provided with the limiting structure in the contact part, and the limiting structure is configured to abut against the contact piece in the axial direction of the vacuum circuit breaker contact, and the limiting structure is further configured to limit the movement of the contact piece away from the contact cup, so that the structural strength of the contact part is improved, and the use reliability of the vacuum circuit breaker contact is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vacuum circuit breakers, in particular to a vacuum circuit breaker contact and a vacuum circuit breaker with the same. BACKGROUND

[0002] The vacuum circuit breaker contact is a part of the vacuum circuit breaker that is directly responsible for the closing and opening of the circuit. When the circuit needs to be closed to allow current to pass through, the moving contact will contact the stationary contact under the action of the appropriate operating mechanism, allowing current to conduct between the moving contact and the stationary contact, thereby realizing the conduction of the circuit. Just like the two contact points of a switch, when closed, the current can pass smoothly.

[0003] When the circuit needs to be cut off, the moving contact and the stationary contact will be separated. For example, in the event of a power system failure, the moving contact and the stationary contact can effectively block the current path when the moving contact and the stationary contact are separated in the event of a fault current or normal circuit maintenance.

[0004] During the long-term use of the vacuum circuit breaker, the contact portion of the vacuum circuit breaker contact is prone to damage due to the repeated engagement and separation of the moving contact and the stationary contact. SUMMARY

[0005] Therefore, it is necessary to provide a vacuum circuit breaker contact to solve the problem that the contact portion of the vacuum circuit breaker contact is prone to damage.

[0006] A vacuum circuit breaker contact includes:

[0007] A contact portion, the contact portion including a contact blade and a contact cup, the contact blade being arranged on the open end of the contact cup;

[0008] A limiting structure, the limiting structure being arranged in the contact portion, the limiting structure being configured to abut against the contact blade in the axial direction of the vacuum circuit breaker contact, and the limiting structure being further configured to limit the movement of the contact blade away from the contact cup;

[0009] A conductive rod, the conductive rod being connected to the contact portion.

[0010] In one embodiment, the limiting structure includes a first limiting member, the first limiting member being arranged on the contact cup, and the first limiting member being configured to abut against the contact blade.

[0011] The limiting structure further includes a second limiting member, the second limiting member being connected between the contact blade and the contact cup, and the second limiting member being configured to limit the movement of the contact blade away from the contact cup.

[0012] In one embodiment, the first limiting member is arranged apart from the contact blade in the axial direction of the vacuum circuit breaker contact.

[0013] In one of the embodiments, the second limiting member is a deformation member.

[0014] In one of the embodiments, the first limiting member is provided with a first assembly part fixedly matched with the contact cup, and is further provided with a second assembly part, and the second limiting member is connected between the second assembly part and the contact piece.

[0015] In one of the embodiments, the first limiting member comprises a first sub-cylinder and a second sub-cylinder, and the second sub-cylinder is arranged at an end surface of the first sub-cylinder facing the contact piece.

[0016] In the axial direction of the first limiting member, the orthographic projection of the second sub-cylinder is smaller than the orthographic projection of the first sub-cylinder, so that the end surface of the first sub-cylinder facing the contact piece is the second assembly part, and the second assembly part surrounds the second sub-cylinder.

[0017] In one of the embodiments, the central axis of the first limiting member is arranged coincidently with the central axis of the contact piece.

[0018] In one of the embodiments, the contact piece is provided with a linear slot, and an included angle θ is formed between the linear slot and the radial line of the contact piece, and the relationship is satisfied: 10°≤θ≤20°.

[0019] In one of the embodiments, the cup wall of the contact cup is provided with a curved slot, and the curved slot extends along the axial direction of the contact cup.

[0020] The vacuum circuit breaker contact described above is provided with a limiting structure in the contact part, and the limiting structure is configured to abut against and limit the contact piece, and the limiting structure is further configured to limit the movement of the contact piece away from the contact cup, so as to improve the structural strength of the contact part, and further improve the use reliability of the vacuum circuit breaker contact.

[0021] The application further proposes a vacuum circuit breaker, which comprises a first contact and a second contact, the second contact and the first contact are coaxially arranged, and the first contact and the first contact are both the vacuum circuit breaker contact according to some embodiments of the application. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a perspective view of the vacuum circuit breaker contact according to an embodiment of the application.

[0023] Figure 2 It is a sectional view of the vacuum circuit breaker contact according to an embodiment of the application.

[0024] Figure 3 It is a structural schematic view of the first contact and the second contact in the engaged state according to an embodiment of the application.

[0025] Figure 4Schematic diagram of the structure of the first contact and the second contact in an initial separation state according to an embodiment of the present application.

[0026] Figure 5 Schematic diagram of the structure of the first contact and the second contact in a completely separated state according to an embodiment of the present application.

[0027] Figure 6 Schematic diagram of the structure of a contact sheet according to an embodiment of the present application.

[0028] Figure 7 3 is a coordinate diagram of the longitudinal magnetic field magnitude when the included angle θ in the contact piece according to an embodiment of the present application is different.

[0029] Figure 8 1 is a coordinate diagram of the radial effective distribution ratio when the angle θ in the contact piece is different according to an embodiment of the present application.

[0030] Reference numerals:

[0031] 100. Vacuum circuit breaker contact; 101. First contact; 102. Second contact; 1. Contact part; 10. Accommodating space; 11. Contact piece; 110. Linear slot; 12. Contact cup; 121. Cup wall; 120. Curved slot; 2. Limiting structure; 21. First limiting member; 21a. First assembly part; 21b. Second assembly part; 211. First sub-column; 212. Second sub-column; 22. Second limiting member; 3. Conductive rod; 200. Welding area; 300. Vacuum arc area. DETAILED DESCRIPTION

[0032] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0033] In the description of the application, it should be understood that, if there are these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0034] In addition, if there are these terms "first", "second", these terms are only for the purpose of description, 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", "second" can explicitly or implicitly include at least one of the features. In the description of the application, if the term "multiple" appears, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0035] In this application, unless otherwise explicitly specified and limited, if there are terms such as "mounting", "connecting", "connecting", "fixing" and the like, these terms should be broadly understood. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0036] In this application, unless otherwise explicitly specified and limited, if there are similar descriptions such as "first feature on or under second feature", the meaning can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" of the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" of the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0037] It is to be noted that when an element is referred to as being "fixed" or "set" on another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element. The terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar terms as used herein only mean for the purpose of illustration and are not meant to be limiting.

[0038] In the related art, in order to meet the requirement of high voltage insulation, a high voltage vacuum circuit breaker needs a larger pole distance. In vacuum breaking, a large pole distance between the contacts will cause a super long / diameter ratio vacuum arc in the pole region, which is difficult to control, and more advanced control technology needs to be used to effectively control the vacuum arc, so as to achieve effective breaking.

[0039] When the moving contact and the static contact of the vacuum circuit breaker are closed, the moving and static contacts will be subjected to a large impact force, which is likely to cause the contact part of the contact (vacuum circuit breaker contact) to have a risk of deformation that cannot withstand such a large impact force, thereby causing damage to the contact part. At the same time, when the moving and static contacts are separated, the generation of a vacuum arc and the poor heat conduction performance of the vacuum environment are likely to cause the internal temperature of the vacuum circuit breaker to be high, causing the material of the contact to soften, and in severe cases, causing the surface of the moving and static contact pieces to be welded, the contact piece of the second contact cannot be effectively disconnected, and thus causing damage to the contact part.

[0040] Referring to Figure 1 and Figure 2 , the vacuum circuit breaker contact 100 according to some embodiments of the present application includes a contact part 1, a limiting structure 2, and a conductive rod 3 connected with the contact part 1. The contact part 1 includes a contact piece 11 and a contact cup 12, and the contact piece 11 covers the opening of the contact cup 12 to define a containing space 10. The limiting structure 2 is arranged in the containing space 10, thereby achieving the effect of arranging the limiting structure 2 in the contact part 1.

[0041] Along the axial direction of the vacuum circuit breaker contact 100 (such as the X direction shown in Figure 2 , the limiting structure 2 is configured to abut and limit the contact piece 11, and the limiting structure 2 is also configured to limit the movement of the contact piece 11 away from the contact cup 12, so as to improve the structural strength of the contact part 1, thereby improving the use reliability of the vacuum circuit breaker contact 100.

[0042] For example, in combination with Figures 3 to 5 , the first contact 101 and the second contact 102 in the vacuum circuit breaker are both vacuum circuit breaker contacts 100 according to the present application. In the axial direction of the vacuum circuit breaker (such as the X direction shown in Figures 3 to 5The first contact 101 and the second contact 102 are coaxially arranged, and the contact part 1 of the first contact 101 is opposite to the second contact 102. Wherein Figure 3 A structure schematic view showing the first contact 101 and the second contact 102 in the engaged state is shown in FIG. 2. Figure 4 A structure schematic view showing the first contact 101 and the second contact 102 in the initial separation state is shown in FIG. 3. Figure 5 A structure schematic view showing the first contact 101 and the second contact 102 in the completely separated state is shown in FIG. 4.

[0043] In combination Figure 3 And Figure 5 As shown in FIG. 4, taking the movement of the first contact 101 and the second contact 102 from the completely separated state to the engaged state as an example, in the process, the first contact 101 moves towards the second contact 102 along the axial direction of the vacuum circuit breaker, and when the contact part 1 of the first contact 101 abuts against the contact part 1 of the second contact 102, the contact part 1 of the first contact 101 exerts a force on the contact part 1 of the second contact 102. Since the limiting structure 2 is arranged in the accommodating space 10 of the contact part 1, and the limiting structure 2 abuts against the contact piece 11 in the axial direction of the vacuum circuit breaker contact 100 (i.e. the axial direction of the vacuum circuit breaker), the limiting structure 2 provides a support force towards the contact piece 11 for the contact piece 11 in the axial direction of the vacuum circuit breaker, which not only reduces the risk of deformation of the contact piece 11 towards the contact cup 12 under the impact of external force, but also shares the impact of external force on the cup wall 121 of the contact cup 12, thereby improving the structural strength of the contact part 1 and the use reliability of the vacuum circuit breaker contact 100.

[0044] And referring to Figure 3 As shown in FIG. 2, when the first contact 101 and the second contact 102 are in the engaged state, the limiting structure 2 arranged on the first contact 101 abuts against the contact piece 11 of the first contact 101, and the limiting structure 2 arranged on the second contact 102 abuts against the contact piece 11 of the second contact 102. This forms a first current flow path between the limiting structure 2 of the first contact 101, the contact piece 11 of the first contact 101, the contact piece 11 of the second contact 102, and the limiting structure 2 of the second contact 102, and also forms a second current flow path of “the contact cup 12 of the first contact 101 — the contact piece 11 of the first contact 101 — the contact piece 11 of the second contact 102 — the contact cup 12 of the second contact 102”, and the length of the first current flow path is less than the length of the second current flow path.

[0045] When the current flows between the first contact 101 and the second contact 102, most of the current flows through the first current flow path, rather than the second current flow path. Since the length of the first current flow path is less than the length of the second current flow path, the equivalent resistance is significantly reduced, which significantly reduces the heat generation of the first contact 101 and the second contact 102, thereby reducing the internal temperature of the vacuum circuit breaker. In addition, between the first contact 101 and the second contact 102, the contact piece 11 of the first contact 101 is in contact with the contact piece 11 of the second contact 102. Due to the existence of the contact resistance, the heat source between the first contact 101 and the second contact 102 is located at the junction of the contact piece 11 of the first contact 101 and the contact piece 11 of the second contact 102. Since the limiting structure 2 is arranged between the contact piece 11 and the contact cup 12 in the vacuum circuit breaker contact 100, a heat dissipation path of “contact piece 11-limiting structure 2-contact cup 12-conductive rod 3” is formed, which is conducive to improving the heat dissipation capacity of the vacuum circuit breaker and reducing the internal temperature of the vacuum circuit breaker.

[0046] In addition, in combination with the above description Figures 3 to 5 For example, the movement of the first contact 101 and the second contact 102 from the engaged state to the fully separated state is described. During this process, the first contact 101 moves away from the second contact 102 along the axial direction of the vacuum circuit breaker. Since the heat source between the first contact 101 and the second contact 102 is located at the junction of the contact piece 11 of the first contact 101 and the contact piece 11 of the second contact 102, there is a risk of fusion welding between the two contact pieces 11 in contact. It should be understood that if a fusion welding area 200 is formed between the two contact pieces 11 in contact, it will cause the risk that the first contact 101 and the second contact 102 cannot be effectively separated.

[0047] If there is a phenomenon of fusion welding between the two contact pieces 11 in contact, during the movement of the first contact 101 and the second contact 102 from the engaged state to the fully separated state, the limiting structure 2 provides a pulling force to the contact piece 11 along the axial direction of the vacuum circuit breaker contact 100 towards the contact cup 12, i.e. the limiting structure 2 is configured to limit the movement of the contact piece 11 away from the contact cup 12. This is conducive to separating the two contact pieces 11 in fusion welding, and at the same time, it also shares the pulling force of the contact cup 12 towards the contact piece 11 through the limiting structure 2, avoiding the separation of the contact piece 11 and the contact cup 12, thereby improving the structural strength of the contact part 1 and further improving the use reliability of the vacuum circuit breaker contact 100.

[0048] From the above, it can be seen that according to the vacuum circuit breaker contact 100 of the present application, a limiting structure 2 is provided in the contact part 1, and the limiting structure 2 is configured to abut against the contact piece 11 for limiting, and the limiting structure 2 is also configured to limit the movement of the contact piece 11 away from the contact cup 12, thereby improving the structural strength of the contact part 1 and further improving the reliability of the vacuum circuit breaker contact 100.

[0049] See Figures 2 to 5 As shown, in some embodiments of the present application, the limiting structure 2 may include a first limiting member 21, the first limiting member 21 is assembled on the contact cup 12, and the first limiting member 21 is configured to abut against the contact piece 11 for limiting position. Figure 3 As shown, when the first contact 101 and the second contact 102 are in the engaged state, the first limiting member 21 abuts against the contact piece 11 for limiting position, so that the limiting structure 2 is configured to abut against the contact piece 11 for limiting position. During the process of the first contact 101 and the second contact 102 moving from the completely separated state to the engaged state, the limiting structure 2 provides a supporting force toward the contact piece 11 on the contact piece 11, thereby improving the structural strength of the contact part 1 and thus improving the reliability of the vacuum circuit breaker contact 100. In addition, the vacuum circuit breaker contact 100 also forms a heat dissipation path of "contact piece 11-limiting structure 2-contact cup 12-conductive rod 3", which is conducive to improving the heat dissipation capacity of the vacuum circuit breaker and making the internal temperature of the vacuum circuit breaker lower.

[0050] The limiting structure 2 may further include a second limiting member 22, the second limiting member 22 being connected between the contact piece 11 and the contact cup 12, and the second limiting member 22 being configured to limit the movement of the contact piece 11 away from the contact cup 12. Figures 3 to 5 As shown, during the movement of the first contact 101 and the second contact 102 from the engaged state to the completely separated state, the first contact 101 moves away from the second contact 102 along the axial direction of the vacuum circuit breaker. Since the limiting structure 2 provides a pulling force for the contact piece 11 along the axial direction of the vacuum circuit breaker contact 100 toward the contact cup 12, that is, the limiting structure 2 is configured to limit the movement of the contact piece 11 away from the contact cup 12. This is conducive to separating the two welded contact pieces 11. At the same time, the limiting structure 2 also shares the pulling force towards the contact piece 11 on the contact cup 12, preventing the contact piece 11 from separating from the contact cup 12, thereby improving the structural strength of the contact part 1 and further improving the reliability of the vacuum circuit breaker contact 100.

[0051] See Figures 3 to 5As shown, in some of the above examples, when the first contact 101 and the second contact 102 of the vacuum circuit breaker are in the engaged state, the limiting structure 2 is in contact with the contact piece 11; when the first contact 101 and the second contact 102 of the vacuum circuit breaker are in the separated state, the limiting structure 2 is spaced apart from the contact piece 11. However, the present application is not limited thereto. In other embodiments, whether the first contact 101 and the second contact 102 of the vacuum circuit breaker are in the engaged state or in the separated state, the limiting structure 2 is always in contact with the contact piece 11. It can also be understood that: whether the first contact 101 and the second contact 102 of the vacuum circuit breaker are in the engaged state or in the separated state, the limiting structure 2 is always in contact and connected between the contact piece 11 and the contact cup 12.

[0052] See Figures 2 to 5 As shown, in some of the above examples, the limiting structure 2 includes a first limiting member 21 and a second limiting member 22, but the present application is not limited thereto. In other examples of the present application, the limiting structure 2 may include a connector (not shown) and a drive limiting member (not shown). During the movement of the first and second contacts 102 from a completely separated state to an engaged state, the drive limiting member restricts the connector from moving axially toward the contact cup 12 of the vacuum circuit breaker contact 100, thereby supporting the connector between the drive limiting member and the contact piece 11. This allows the limiting structure 2 to provide a supporting force toward the contact piece 11, thereby enhancing the structural strength of the contact portion 1 and, consequently, improving the reliability of the vacuum circuit breaker contact 100. Furthermore, the vacuum circuit breaker contact 100 may form a heat dissipation path of "contact piece 11 - limiting structure 2 - contact cup 12 - conductive rod 3," which helps improve the heat dissipation capacity of the vacuum circuit breaker and keeps the internal temperature of the vacuum circuit breaker low.

[0053] In addition, during the movement of the first contact 101 and the second contact 102 from the engaged state to the disengaged state, the driving limit portion applies a pulling force to the connector along the axial direction of the vacuum circuit breaker contact 100 toward the contact cup 12. This facilitates the separation of the two welded contact pieces 11. At the same time, the limiting structure 2 also shares the pulling force exerted on the contact cup 12 toward the contact piece 11, preventing the contact piece 11 from separating from the contact cup 12, thereby improving the structural strength of the contact portion 1 and further enhancing the reliability of the vacuum circuit breaker contact 100.

[0054] See Figure 2 As shown, in some embodiments of the present application, in the axial direction of the vacuum circuit breaker contact 100, the first limiting member 21 is spaced apart from the contact piece 11. Figure 4 and Figure 5As shown, when the first contact 101 and the second contact 102 are in a separated state (e.g., an initial separated state, a completely separated state), the first limit member 21 is spaced apart from the contact piece 11. At this time, only a second current flow path is formed between the first contact 101 and the second contact 102, so that the required longitudinal magnetic field is generated between the poles of the first contact 101 and the second contact 102, thereby achieving effective control of the arc.

[0055] Exemplarily, when the first contact 101 and the second contact 102 are in a completely separated state, a vacuum arc region 300 is formed between the first contact 101 and the second contact 102. Taking the first contact 101 as a movable contact and the second contact 102 as a stationary contact as an example, the current flows sequentially along the conductive rod 3, the contact cup 12, and the contact piece 11 of the first contact 101, and then can be guided to the contact piece 11 of the second contact 102 through the vacuum arc region 300. In the second contact 102, the current can flow sequentially along the contact piece 11, the contact cup 12, and the conductive rod 3.

[0056] See Figure 2 As shown, in some embodiments of the present application, the second limiting member 22 is a deformable member. This prevents the slight deformation of the contact piece 11 from being affected by the second limiting member 22 when the contact piece 11 slightly deforms to abut against the first limiting member 21. Thus, when the first contact 101 and the second contact 102 are in a separated state, the first limiting member 21 is spaced apart from the contact piece 11. When the first contact 101 and the second contact 102 are in an engaged state, the first limiting member 21 abuts against the contact piece 11. For example, the second limiting member 22 can be a deformable structure such as a chain structure or a rope structure, and has a maximum length dimension. In some examples of the present application, the second limiting member 22 is described as a chain structure.

[0057] In some embodiments of the present application, the limiting structure 2 includes a first limiting member 21 and a second limiting member 22, and along the axial direction of the vacuum circuit breaker contact 100, the first limiting member 21 is spaced apart from the contact piece 11. The conductivity of the second limiting member 22 is much lower than that of the contact part 1, the first limiting member 21 and the conductive rod 3. For example, in combination Figure 5 As shown, only a second current flow path is formed between the first contact 101 and the second contact 102 , so that a required longitudinal magnetic field is generated between the first contact 101 and the second contact 102 , thereby achieving effective control of the arc.

[0058] Exemplarily, in an example of the present application, the contact head 1 and the conductive rod 3 are made of copper or chromium-copper alloy material, the first limiting piece 21 is made of copper material, and the second limiting piece 22 is made of stainless steel material with a conductivity much lower than that of copper or chromium-copper alloy material. In this way, only the second current flow path is formed between the first contact 101 and the second contact 102, and the first contact 101 and the second contact 102 are spaced apart and can conduct current through the vacuum arc region 300. It can also be understood that, when the first contact 101 and the second contact 102 are completely separated, the second current flow path can include part of the vacuum arc region 300.

[0059] It should be noted that, in some examples of the present application, the second limiting piece 22 can also be made of insulating material.

[0060] Referring to Figure 2 In some embodiments of the present application, the first limiting piece 21 is provided with a first assembly part 21a, the first assembly part 21a is fixedly matched with the contact cup 12, and the first limiting piece 21 is further provided with a second assembly part 21b, and the second limiting piece 22 is connected between the second assembly part 21b and the contact piece 11. In this way, the second limiting piece 22 can be assembled on the first limiting piece 21 to be connected with the contact piece 11. It can be understood that, the second limiting piece 22 is connected between the contact piece 11 and the contact cup 12 in an indirect connection manner through the first limiting piece 21, so that the second limiting piece 22 is configured to limit the movement of the contact piece 11 away from the contact cup 12.

[0061] Since the first limiting piece 21 is provided with the second assembly part 21b, the second limiting piece 22 can be fixedly matched with the first limiting piece 21, so that the limiting structure 2 is an integral part. In this way, during the assembly of the vacuum circuit breaker contact 100 by the operator, the operator can be facilitated to assemble, and the probability of missing parts can be reduced. Not only the production efficiency of the vacuum circuit breaker contact 100 can be improved, but also the yield can be improved.

[0062] It should be noted that, in the above example, the second limiting piece 22 is connected between the contact piece 11 and the contact cup 12 in an indirect connection manner through the first limiting piece 21, but the present application is not limited thereto. In some other examples of the present application, the second limiting piece 22 can also be directly connected between the contact piece 11 and the contact cup 12.

[0063] Referring to Figure 2As shown, in some embodiments of the present application, the first limiting member 21 comprises a first sub-cylinder 211 and a second sub-cylinder 212, and the second sub-cylinder 212 is arranged at the end face of the first sub-cylinder 211 towards the contact piece 11. For example, the first sub-cylinder 211 is fixedly arranged at the contact cup 12, and the second sub-cylinder 212 is fixedly arranged at the first sub-cylinder 211, so as to realize the effect that the first limiting member 21 is fixedly assembled at the contact cup 12. Moreover, in the axial direction of the vacuum circuit breaker contact 100, the second sub-cylinder 212 is located at the end face of the first sub-cylinder 211 towards the contact piece 11, which makes the second sub-cylinder 212 suitable for abutting contact with the contact piece 11.

[0064] Wherein, in the axial direction of the first limiting member 21, the orthographic projection of the second sub-cylinder 212 is smaller than the orthographic projection of the first sub-cylinder 211, which makes the end face of the first sub-cylinder 211 towards the contact piece 11 be a second assembly part 21b, and the second assembly part 21b surrounds the second sub-cylinder 212. It can also be understood that, when the second sub-cylinder 212 is arranged at the first sub-cylinder 211, the part of the end of the first sub-cylinder 211 towards the contact piece 11 which is not blocked by the second sub-cylinder 212 is the second assembly part 21b.

[0065] For example, referring to Figure 2 As shown, the first sub-cylinder 211 and the second sub-cylinder 212 are both cylindrical, and the diameter of the second sub-cylinder 212 is smaller than the diameter of the first sub-cylinder 211, which makes the orthographic projection of the second sub-cylinder 212 be smaller than the orthographic projection of the first sub-cylinder 211. When the second sub-cylinder 212 is arranged at the first sub-cylinder 211, the end of the first sub-cylinder 211 towards the contact piece 11 forms a second assembly part 21b in the shape of a circular ring, and the second assembly part 21b surrounds the second sub-cylinder 212. The limiting structure 2 is provided with a plurality of second limiting members 22 (for example, two second limiting members 22 are provided in the present example), and since the second assembly part 21b surrounds the second sub-cylinder 212, the second limiting members 22 can be arranged in sequence along the circumferential direction of the first limiting member 21. The plurality of second limiting members 22 are connected between the first limiting member 21 and the contact piece 11, and the plurality of second limiting members 22 are arranged in sequence along the circumferential direction of the first limiting member 21, which makes the plurality of second limiting members 22 be able to uniformly exert pulling force on the contact piece 11, so as to make the limiting structure 2 more effectively share the pulling force on the contact cup 12 towards the contact piece 11, and avoid the contact piece 11 from separating from the contact cup 12.

[0066] For example, referring to Figure 2As shown, in some embodiments of the present application, the central axis of the first stopper 21 is arranged to coincide with the central axis of the contact piece 11, so that the first stopper 21 effectively supports the contact piece 11. It should be understood that when the first stopper 21 is in contact with the contact piece 11, since the central axis of the first stopper 21 coincides with the central axis of the contact piece 11, the first stopper 21 is supported at least in the central area of ​​the contact piece 11, which can improve the overall structural strength of the contact piece 11.

[0067] See Figure 6 As shown, in some embodiments of the present application, the contact piece 11 is provided with a linear slot 110, and an angle θ is formed between the linear slot 110 and the radial line of the contact piece 11, satisfying the relationship: 10°≤θ≤20°, for example, θ can be 10°, 11°, 12°, 13°, 14°, 15°, 16°, 17°, 18°, 19°, 20°, etc.

[0068] A straight slot 110 is provided on the contact piece 11, which forms an angle θ with the radial line of the contact piece 11. In this way, the residual magnetism of the vacuum circuit breaker contact 100 at the current zero crossing does not increase much, while the longitudinal magnetic field size and the effective distribution ratio of the magnetic field at the current peak moment are significantly increased, providing better magnetic field characteristics, which is conducive to the effective interruption of the vacuum arc.

[0069] For example, combined Figures 6 to 8 As shown, Figure 7 and Figure 8 The figure shows the inter-pole magnetic field conditions at different angles θ simulated using Maxwell simulation software. Figure 7 The vertical axis shows the longitudinal magnetic magnitude (mT), Figure 7 The horizontal axis in shows the size of the angle θ (°), and Figure 7 The upper curve shows the change of the longitudinal magnetic field at the peak current moment. Figure 7 The lower curve in the figure shows the change state of the longitudinal magnetic field at the time when the current passes through zero. Figure 8 The vertical axis in the figure shows the radial effective distribution ratio (%). Figure 8 The horizontal axis in shows the size of the angle θ (°).

[0070] The longitudinal magnetic results of the different contact pieces 11 with different included angles θ are compared. From the simulation results, it can be seen that as the included angle θ increases, the longitudinal magnetic intensity at the current peak time and the radial effective distribution ratio will both increase first and then decrease. However, the difference is that the longitudinal magnetic intensity at the current peak time reaches the maximum when the included angle θ = 15°, while the magnetic field radial effective distribution ratio reaches the maximum when the included angle θ = 25° and θ = 30°. Based on the above data results, in some examples of the present application, θ = 15° is selected as an example, so that the residual magnetism of the vacuum circuit breaker contact 100 according to the present application at the current zero-crossing time is increased slightly, the longitudinal magnetic size at the current peak time and the magnetic field effective distribution ratio are significantly increased, better magnetic field characteristics are provided, and the effective breaking of the vacuum arc is facilitated.

[0071] Referring to Figure 1 As shown, the cup wall 121 of the contact cup 12 is provided with a curved slot 120 extending along the axial direction of the contact cup 12. For example, the cup wall 121 of the contact cup 12 is provided with a plurality of curved slots 120 arranged in sequence along the circumferential direction of the cup wall 121, and adjacent two curved slots 120 are arranged in a spaced manner, so that the cup wall 121 of the contact cup 12 is formed by a plurality of single bodies, or it can also be understood that the cup wall 121 is formed by a plurality of single bodies spaced by the curved slots 120. In addition, each curved slot 120 extends along the axial direction of the contact cup 12, like a spiral curve.

[0072] Since the cup wall 121 of the contact cup 12 is provided with the curved slot 120 extending along the axial direction of the contact cup 12, the cup wall 121 of the contact cup 12 is formed by a plurality of single bodies. In combination with Figure 3 As shown, compared with the first current flow path and the second current flow path, since the curved slot 120 is arranged on the contact cup 12, the length of the first current flow path is much smaller than the length of the second current flow path. Therefore, when the current flows between the first contact 101 and the second contact 102, most of the current flows through the first current flow path, rather than through the second current flow path.

[0073] Since the length of the first current flow path is smaller than the length of the second current flow path, the equivalent resistance is significantly reduced, which makes the heating of the first contact 101 and the second contact 102 significantly reduced, so that the internal temperature of the vacuum circuit breaker is lower. By arranging the curved slot 120 on the cup wall 121 of the contact cup 12, not only the length of the current path can be increased, but also the magnetic field can be enhanced, thereby effectively controlling the vacuum arc.

[0074] Referring to Figures 3 to 5As shown, according to the vacuum circuit breaker of the present application, the vacuum circuit breaker may include a first contact 101 and a second contact 102 , and the first contact 101 and the second contact 102 are both selected as the vacuum circuit breaker contacts 100 in some of the above embodiments.

[0075] In the vacuum circuit breaker, along the axial direction of the vacuum circuit breaker (such as Figures 3 to 5 In the X direction shown in the figure, the second contact 102 and the first contact 101 are coaxially arranged, wherein the first contact 101 is configured as a moving contact and the second contact 102 is configured as a static contact. By controlling the moving contact to move relative to the static contact along the axial direction of the vacuum circuit breaker, the moving contact and the static contact are engaged and separated.

[0076] In the vacuum circuit breaker according to the present application, since the first contact 101 and the second contact 102 are both selected as the vacuum circuit breaker contacts 100 in some of the above-mentioned embodiments, and since a limiting structure 2 is provided in the contact part 1 of the vacuum circuit breaker contact 100, and the limiting structure 2 is configured to abut against the contact piece 11 for limiting, and the limiting structure 2 is also configured to limit the movement of the contact piece 11 away from the contact cup 12, the structural strength of the contact part 1 is improved, thereby improving the reliability of the vacuum circuit breaker contact 100.

[0077] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned 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.

[0078] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A vacuum circuit breaker contact, characterized in that: include: A contact portion, comprising a contact sheet and a contact cup, wherein the contact sheet covers an opening of the contact cup; A limiting structure is provided in the contact part, the limiting structure includes a first limiting member, the first limiting member is assembled on the contact cup, and the central axis of the first limiting member is coincident with the central axis of the contact piece, the first limiting member is configured to abut against the contact piece for limiting position, the limiting structure also includes a second limiting member, the second limiting member is connected between the contact piece and the contact cup, and the second limiting member is configured to limit the movement of the contact piece away from the contact cup; wherein, The first limiting member includes a first sub-column and a second sub-column, the second sub-column is arranged on the end surface of the first sub-column facing the contact piece, the end of the first sub-column away from the second sub-column is a first assembly portion, and the first assembly portion is fixedly matched with the contact cup; Along the axial direction of the first limiting member, the orthographic projection of the second sub-column is smaller than the orthographic projection of the first sub-column, so that the end surface of the first sub-column facing the contact piece serves as a second assembly portion, the second assembly portion surrounds the second sub-column, and the second limiting member is connected between the second assembly portion and the contact piece; A conductive rod is connected to the contact part.

2. The vacuum circuit breaker contact according to claim 1, characterized in that: In the axial direction of the vacuum circuit breaker contact, the first limiting member is spaced apart from the contact piece.

3. The vacuum circuit breaker contact according to claim 2, characterized in that: The second limiting member is a deformable member.

4. The vacuum circuit breaker contact according to claim 1, characterized in that: The first limiting member is provided with a first assembly portion, which is fixedly matched with the contact cup. The first limiting member is also provided with a second assembly portion, which is connected between the second assembly portion and the contact piece.

5. The vacuum circuit breaker contact according to any one of claims 1 to 4, characterized in that: The contact piece is provided with a linear slot, and an angle θ is formed between the linear slot and a radial line of the contact piece, satisfying the relationship: 10°≤θ≤20°.

6. The vacuum circuit breaker contact according to any one of claims 1 to 4, characterized in that: The cup wall of the contact cup is provided with a curved slot, and the curved slot extends along the axial direction of the contact cup.

7. A vacuum circuit breaker, characterized in that: include: First contact; The second contact is coaxially arranged with the first contact, and both the first contact and the second contact are vacuum circuit breaker contacts according to any one of claims 1 to 6.

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