Contact structure of longitudinal magnetic circuit breaker

Abstract

The invention relates to a contact structure of a longitudinal magnetic circuit breaker, which can solve the problem that the contact structure of the longitudinal magnetic circuit breaker in the related technology is difficult to give consideration to good arc extinguishing effect and mechanical strength, the contact structure of the longitudinal magnetic circuit breaker comprises a contact cup, a screw mechanism and a contact blade, the contact cup is provided with an accommodating cavity and a cup opening, the screw mechanism is embedded in the accommodating cavity, and the cup opening is provided with an opening. The spiral mechanism is provided with at least two spiral grooves, the spiral grooves are spirally arranged around the axial direction of the contact cup, at least part of the spiral mechanism protrudes out of the cup opening in the axial direction of the contact cup, the contact piece abuts against the spiral mechanism in the axial direction of the contact cup, and the contact piece is configured to be capable of compressing the spiral mechanism in the axial direction of the contact cup till the spiral mechanism abuts against the cup opening for limiting.

Description

Technical Field

[0001] This application relates to the field of high-voltage electrical technology, and in particular to a contact structure for a longitudinal magnetic circuit breaker. Background Technology

[0002] In the field of high-voltage electrical technology, longitudinal magnetic circuit breakers, with their excellent ability to control electric arcs using longitudinal magnetic fields, have become core equipment for ensuring the safe operation of power systems. The performance of their contact structure directly affects the arc-extinguishing efficiency and service life of the circuit breaker.

[0003] In related technologies, spiral conductive paths are typically machined directly on the wall of the contact cup to achieve the magnetic field generation function of the contact cup.

[0004] However, as power systems develop towards higher voltage and higher current, optimizing the spiral conductive path, such as increasing the number of spiral grooves to enhance the magnetic field strength, weakens the mechanical strength of the contact cup. This makes it prone to deformation and cracking under opening and closing impacts. If the support strength is guaranteed, the magnetic field distribution becomes uneven, resulting in poor arc extinguishing effect. Therefore, the contact structure of longitudinal magnetic circuit breakers in related technologies struggles to balance good arc extinguishing effect with mechanical strength. Summary of the Invention

[0005] Therefore, it is necessary to provide a contact structure for a longitudinal magnetic circuit breaker to address the problem that the contact structure of longitudinal magnetic circuit breakers in related technologies cannot simultaneously achieve good arc extinguishing effect and mechanical strength.

[0006] This application provides a contact structure for a longitudinal magnetic circuit breaker, the contact structure comprising:

[0007] A contact cup, wherein the contact cup is provided with a receiving cavity and a cup mouth;

[0008] A spiral mechanism is embedded in the receiving cavity. The spiral mechanism has at least two spiral grooves, which are spirally arranged around the axial direction of the contact cup, such that at least a portion of the spiral mechanism protrudes from the cup opening along the axial direction of the contact cup.

[0009] A contact piece that presses against a screw mechanism along the axial direction of the contact cup, and the contact piece is configured to compress the screw mechanism along the axial direction of the contact cup until it abuts against the cup opening and is limited.

[0010] The longitudinal magnetic circuit breaker contact structure described in this application, with its helical mechanism embedded within the receiving cavity, facilitates the separation of the conductive helical mechanism and the supporting contact cup. This prevents excessive compression of the helical mechanism by the contact plates, while simultaneously increasing the range of helical loops and the number of helical grooves, thus balancing the good arc-extinguishing effect and mechanical strength of the helical mechanism. Furthermore, the helical mechanism embedded within the receiving cavity, with the helical grooves spirally arranged around the contact cup axially, helps to form a uniform longitudinal magnetic field when current flows through, allowing the arc to spread in a spiral shape, significantly reducing the arc energy density and improving arc-extinguishing efficiency. In addition, the arrangement of the contact plates pressing against the helical mechanism along the contact cup axially helps absorb impact forces during circuit breaker closing through the elastic deformation energy of the helical mechanism, avoiding mechanical damage caused by rigid collisions between the contact plates and the cup opening.

[0011] In one embodiment, the contact cup is provided with a limiting part at the bottom of the receiving cavity, the contact piece is connected to a limiting member, the limiting member passes through the receiving cavity and engages with the limiting part to limit the position.

[0012] In one embodiment, the limiting part includes a limiting cavity with a limiting opening. The limiting member includes an extension and a limiting block. One end of the extension is connected to the contact piece, and the other end of the extension is connected to the limiting block. The extension passes through the limiting opening and causes the limiting block to engage in the limiting cavity. The limiting block is movably disposed in the limiting cavity along the axial direction of the contact cup.

[0013] In one embodiment, when the contact piece moves away from the cup opening to such that the limiting block and the limiting cavity abut against each other and are limited, the limiting block and the bottom wall of the contact cup have a first preset distance, and the contact piece and the cup opening have a second preset distance along the axial direction of the contact cup.

[0014] In one embodiment, the first preset spacing is equal to the second preset spacing.

[0015] In one embodiment, the value range of the first preset spacing and / or the second preset spacing is 0.8mm-1.2mm.

[0016] In one embodiment, the contact piece has at least two first radial grooves that extend radially along the contact piece.

[0017] In one embodiment, the contact cup is provided with a limiting groove at the circumferential edge of the bottom of the receiving cavity, and the spiral mechanism engages and limits the limiting groove along the radial direction of the contact cup.

[0018] In one embodiment, the spiral mechanism includes at least two spiral strips arranged at equal intervals, the spiral strips being attached to the side wall of the contact cup within the receiving cavity, and the two ends of the spiral strips respectively abutting against the contact plate and the bottom wall of the contact cup within the receiving cavity.

[0019] In one embodiment, the longitudinal magnetic circuit breaker contact structure further includes a conductive rod, which is connected along the axial direction of the contact cup to the outer wall of the contact cup on the side opposite to the contact piece. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the contact structure of a longitudinal magnetic circuit breaker in one embodiment of this application.

[0021] Figure 2 for Figure 1 The top view of the contact structure of the longitudinal magnetic circuit breaker is shown.

[0022] Figure 3 for Figure 2 The diagram shows a cross-sectional view of the contact structure of the longitudinal magnetic circuit breaker at point AA.

[0023] Figure 4 for Figure 1 The exploded view of the contact structure of the longitudinal magnetic circuit breaker in one embodiment is shown.

[0024] Figure 5 for Figure 1 The exploded view of the contact structure of the longitudinal magnetic circuit breaker shown is from another embodiment.

[0025] Explanation of icon numbers

[0026] 10. Contact structure of longitudinal magnetic circuit breaker; 100. Contact cup; 110. Receiving cavity; 120. Cup opening; 130. Limiting part; 131. Limiting cavity; 1311. Limiting opening; 140. Limiting groove; 150. Outer wall; 200. Spiral mechanism; 210. Spiral groove; 220. Spiral strip; 300. Contact piece; 301. First radial groove; 310. Limiting element; 311. Extension element; 312. Limiting block; 400. Conductive rod; D1. First preset spacing; D2. Second preset spacing. Detailed Implementation

[0027] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0028] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0029] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0030] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0031] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0032] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, 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 possible implementation.

[0033] In related technologies, spiral conductive paths are typically machined directly onto the contact cup wall to generate the magnetic field. However, as power systems evolve towards higher voltage and higher current, optimizing the spiral conductive path, such as increasing the number of spiral grooves to enhance the magnetic field strength, weakens the mechanical strength of the contact cup, making it prone to deformation and cracking under opening and closing impacts. If the supporting strength is guaranteed, the magnetic field distribution becomes uneven, resulting in poor arc extinguishing performance. Therefore, the contact structure of longitudinal magnetic circuit breakers in related technologies struggles to balance good arc extinguishing performance with mechanical strength. This application provides a longitudinal magnetic circuit breaker contact structure 10 that can achieve both good arc extinguishing performance and mechanical strength.

[0034] Specifically, please refer to Figures 1 to 4 This application provides a contact structure 10 for a longitudinal magnetic circuit breaker, which includes a contact cup 100, a helical mechanism 200, and a contact plate 300. The contact cup 100 has a receiving cavity 110 and a cup opening 120. The helical mechanism 200 is embedded in the receiving cavity 110 and has at least two helical grooves 210. The helical grooves 210 are helically arranged around the axial direction of the contact cup 100, and at least a portion of the helical mechanism 200 protrudes from the cup opening 120 along the axial direction of the contact cup 100. The contact plate 300 abuts against the helical mechanism 200 along the axial direction of the contact cup 100, and the contact plate 300 is configured to compress the helical mechanism 200 along the axial direction of the contact cup 100 until it abuts against and is limited to the cup opening 120.

[0035] The contact structure 10 of the longitudinal magnetic circuit breaker described in this application, with the helical mechanism 200 embedded in the accommodating cavity 110, helps to separate the helical mechanism 200 for conducting electricity and the contact cup 100 for support. Therefore, the contact cup 100 can abut and limit the contact piece 300, preventing the contact piece 300 from excessively compressing the helical mechanism 200. This allows for an increase in the range of helical loop setting and the number of helical grooves 210 while ensuring mechanical strength, thus balancing the good arc extinguishing effect and mechanical strength of the helical mechanism 200.

[0036] In addition, the contact structure 10 of the longitudinal magnetic circuit breaker described in this application is embedded in the accommodating cavity 110 through the spiral mechanism 200. The spiral groove 210 is spirally arranged around the contact cup 100, which helps to form a uniform longitudinal magnetic field when the current flows through the spiral mechanism 200, which can make the electric arc spread in a spiral shape, greatly reduce the electric arc energy density, and improve the arc extinguishing efficiency.

[0037] Furthermore, the contact structure 10 of the longitudinal magnetic circuit breaker described in this application, by setting the contact piece 300 to press against the screw mechanism 200 along the axial direction of the contact cup 100, helps to absorb the impact force through the elastic deformation energy of the screw mechanism 200 when the circuit breaker is closed, thus avoiding mechanical damage caused by the rigid collision between the contact piece 300 and the cup opening 120.

[0038] Please see Figure 3 Optionally, the contact cup 100, the spiral mechanism 200 and the contact plate 300 mentioned above in this application are arranged coaxially, which helps to optimize the internal space layout, reduce assembly steps and improve production efficiency.

[0039] It should be noted that the height of the spiral mechanism 200 protruding from the cup opening 120 after assembly can be adjusted according to the opening and closing stroke of the circuit breaker to which the longitudinal magnetic circuit breaker contact structure 10 is applied, so as to reserve sufficient space for the compression buffer of the contact piece 300.

[0040] Optionally, the contact piece 300 may be made of a copper-tungsten alloy, which helps to improve its resistance to arc erosion. In addition, the side of the contact piece 300 facing the screw mechanism 200 may be machined into an arc-shaped contact surface that conforms to the contour of the screw mechanism, which helps to reduce the contact gap and ensure the stability of current transmission.

[0041] Please continue to participate. Figure 3 In some embodiments, the longitudinal magnetic circuit breaker contact structure 10 further includes a conductive rod 400, which is connected along the axial direction of the contact cup 100 to the outer wall 150 of the side of the contact cup 100 away from the contact piece 300, thereby enabling stable current transmission.

[0042] Optionally, the conductive rod 400 may be made of oxygen-free copper, which helps to improve conductivity, reduce resistivity, and improve the smoothness of the current transmission path. Optionally, the diameter of the conductive rod 400 can be adapted to the rated current.

[0043] Optionally, the connection between the conductive rod 400 and the outer wall 150 of the contact cup 100 may be, but is not limited to, welding, and the outer wall 150 of the contact cup 100 needs to be polished to reduce contact resistance.

[0044] Preferably, the axis of the conductive rod 400 is coaxial with the axis of the contact cup 100. This helps to ensure uniform current transmission along the axial direction and avoids local current concentration that could generate high temperatures. It should be noted that the length of the conductive rod 400 can be adapted to the depth of the arc-extinguishing chamber of the circuit breaker to which the longitudinal magnetic circuit breaker contact structure 10 is applied. The end of the conductive rod 400 furthest from the contact cup 100 can be provided with a threaded connection structure for easy linkage with the circuit breaker operating mechanism.

[0045] It is worth noting that, in practical applications, the conductive rod 400 described above in this application is not only used to achieve stable current transmission, but also to quickly conduct the heat conducted by the contact cup 100 to the circuit breaker heat dissipation system, effectively avoiding material softening at high temperatures and material performance degradation.

[0046] Please see Figures 3 to 5 In some embodiments, the contact cup 100 has a limiting part 130 at the bottom of the receiving cavity 110, and the contact piece 300 is connected to a limiting member 310. The limiting member 310 passes through the receiving cavity 110 and is engaged with the limiting part 130 to limit the contact piece. In this way, the engagement between the limiting member 310 and the limiting part 130 helps to limit the axial range of movement of the contact piece 300, avoids excessive compression and deformation of the screw mechanism 200 or contact piece 300 falling off due to excessive movement of the contact piece 300, and improves structural safety.

[0047] In addition, in the embodiment, the setting of the limiting member 310 passing through the receiving cavity 110 and engaging with the limiting part 130 helps to ensure that the contact piece 300 is supported by the screw mechanism 200 in opposite directions and limited by the limiting part 130 in the axial direction of the contact cup 100. This can maintain good contact between the contact piece 300 and the screw mechanism 200 and ensure stable current transmission.

[0048] Please see Figure 3In some embodiments, the limiting part 130 may include a limiting cavity 131, the limiting cavity 131 is provided with a limiting opening 1311, the limiting member 310 includes an extension member 311 and a limiting block 312, one end of the extension member 311 is connected to the contact piece 300, and the other end of the extension member 311 is connected to the limiting block 312. The extension member 311 passes through the limiting opening 1311 and causes the limiting block 312 to be engaged in the limiting cavity 131. The limiting block 312 is movably disposed in the limiting cavity 131 along the axial direction of the contact cup 100.

[0049] More specifically, the locking mechanism 312, which engages within the limiting cavity 131, facilitates axial movement of the limiting block 312 within the limiting cavity 131 along the contact cup 100. This satisfies the compression requirements of the contact piece 300 on the screw mechanism 200 while also ensuring the compressibility of the screw mechanism 200. Furthermore, the clearance fit between the limiting opening 1311 and the extension 311 helps ensure that the contact piece 300 always moves axially, preventing poor contact or arc deviation caused by lateral offset and guaranteeing arc extinguishing stability.

[0050] Optionally, the limiting part 130 of the contact cup 100 in the receiving cavity 110 can be a cylindrical limiting cavity 131. Correspondingly, the limiting block 312 can be a cylindrical structure, which ensures that the limiting block 312 moves smoothly in the cylindrical limiting cavity 131 and also plays a guiding role.

[0051] Please see Figure 3 In some embodiments, when the contact piece 300 moves away from the cup opening 120 to such that the limiting block 312 and the limiting cavity 131 abut against each other and are limited, the limiting block 312 and the bottom wall of the contact cup 100 have a first preset distance D1, and the contact piece 300 and the cup opening 120 have a second preset distance D2 along the axial direction of the contact cup 100.

[0052] Specifically, the setting of the first preset distance D1 and the second preset distance D2 helps to ensure the feasibility of the contact piece 300 when it is in the compression screw mechanism 200. When the contact piece 300 is in the compression screw mechanism 200, the limiting block 312 can move towards the bottom wall of the contact cup 100 within the range of the first preset distance D1, and finally the compression movement is limited by the cup mouth 120 and / or the bottom wall of the contact cup 100.

[0053] In some embodiments, the first preset spacing D1 and the second preset spacing D2 are equal, thus achieving a dual limiting effect on the contact piece 300 while the contact piece 300 abuts against the cup opening 120, and the limiting block 312 abuts against the bottom wall of the contact cup 100. Simultaneously, since the limiting block 312 abuts against the bottom wall of the contact cup 100, heat is effectively conducted and dissipated through the conductive path between the limiting member 310 and the bottom wall of the contact cup 100, thereby improving heat dissipation.

[0054] In some embodiments, the first preset spacing D1 and / or the second preset spacing D2 are in the range of 0.8mm-1.2mm, such that the first preset spacing D1 and / or the second preset spacing D2 can be 0.8mm, 0.9mm, 1.0mm, 1.1mm or 1.2mm, etc.

[0055] Please see Figure 3 In some embodiments, the contact cup 100 is provided with a limiting groove 140 at the circumferential edge of the bottom of the receiving cavity 110. The spiral mechanism 200 is engaged and limited in the limiting groove 140 along the radial direction of the contact cup 100. This can reduce the radial movement of the spiral mechanism 200 in the receiving cavity 110, ensure the stability of the spiral trajectory of the spiral groove 210, avoid magnetic field inhomogeneity caused by radial offset, and help improve the installation and positioning stability of the spiral mechanism 200.

[0056] Specifically, the limiting groove 140 can be configured as an annular groove. Understandably, its width matches the radial thickness of the screw mechanism 200, thus ensuring stable radial positioning of the screw mechanism 200 along the contact cup 100 after engagement. Alternatively, the inner wall of the limiting groove 140 can be polished smooth to reduce frictional resistance during assembly of the screw mechanism 200. The outer circumferential surface of the screw mechanism 200 and the mating surface of the limiting groove 140 need to be deburred to avoid assembly scratches caused by sharp edges.

[0057] It is worth noting that the setting of the limiting groove 140 mentioned above in this application also helps to maintain the structural stability of the screw mechanism 200 when the contact piece 300 is subjected to current impact or mechanical vibration to compress the screw mechanism 200, thus avoiding loosening or displacement and improving the impact resistance.

[0058] Please see Figure 4 and Figure 5In some embodiments, the helical mechanism 200 includes at least two equally spaced helical strips 220, such as, but not limited to, two, three, four, five, or six helical strips. The helical strips 220 are attached to the sidewall of the contact cup 100 within the receiving cavity 110, and the two ends of the helical strips 220 respectively abut against the bottom wall of the contact piece 300 and the contact cup 100 within the receiving cavity 110, which helps to improve the force balance of the helical mechanism.

[0059] Specifically, the above embodiments of this application, by equidistantly arranging the spiral strips 220, help to make the longitudinal magnetic field generated when the current flows through the spiral mechanism 200 more uniform and the arc diffusion more sufficient. Furthermore, the spiral strips 220 adhering to the side wall of the contact cup 100 within the accommodating cavity 110 also help to quickly conduct the heat of the contact piece 300 to the contact cup 100, thus assisting in heat dissipation.

[0060] Optionally, the spiral mechanism 200 preferably has four spiral bars 220, which can be made of copper alloy. This helps to combine conductivity and elasticity, allowing the elastic deformation during closing to absorb the impact force. In addition, the ends of the spiral bars 220 are chamfered to avoid rigid collision with the bottom wall of the contact plate 300 and the contact cup 100. The contact surfaces of the spiral bars 220 and the side wall of the receiving cavity 110 must be in close contact to ensure efficient heat conduction.

[0061] It is also worth noting that the design of the spiral strip 220 fitting against the side wall of the contact cup 100 within the accommodating cavity 110 also helps to further improve the heat conduction effect of the spiral strip 220 on the contact piece 300.

[0062] Please see Figure 4 and Figure 5 In some embodiments, the contact piece 300 has at least two first radial grooves 301, which extend radially along the contact piece 300. For example, the first radial grooves 301 can be configured as two, three, four, five, or six, etc. Preferably, there are four first radial grooves 301.

[0063] Specifically, the first radial groove 301 helps to divide the electric arc on the surface of the contact piece 300 into multiple branches, reducing the energy density of a single arc, while guiding the arc to diffuse radially, avoiding localized high-temperature ablation of the contact piece 300. In addition, the first radial groove 301 also helps to reduce the concentration of contact area when the contact piece 300 is closed, reducing the probability of welding between the contact piece 300 and the screw mechanism 200 caused by high arc temperature, and improving the reliability of the longitudinal magnetic circuit breaker contact structure 10 in circuit breaker opening and closing applications. Furthermore, the first radial groove 301 also helps to increase the heat dissipation area of ​​the contact piece 300, accelerating heat dissipation and preventing material performance degradation caused by high temperatures.

[0064] Optionally, the groove wall of the first radial groove 301 can be polished, which helps to avoid ablation and accumulation caused by electric arc adhesion; the first radial groove 301 can be processed by laser cutting, which helps to improve precision.

[0065] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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.

[0066] The embodiments described above are merely illustrative of several implementation methods of this application, and 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 those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A contact structure for a longitudinal magnetic circuit breaker, characterized in that, The contact structure of the longitudinal magnetic circuit breaker includes: A contact cup, wherein the contact cup is provided with a receiving cavity and a cup mouth; A spiral mechanism is embedded in the receiving cavity. The spiral mechanism has at least two spiral grooves, which are spirally arranged around the axial direction of the contact cup, such that at least a portion of the spiral mechanism protrudes from the cup opening along the axial direction of the contact cup. A contact piece that presses against a screw mechanism along the axial direction of the contact cup, and the contact piece is configured to compress the screw mechanism along the axial direction of the contact cup until it abuts against the cup opening and is limited.

2. The contact structure of the longitudinal magnetic circuit breaker according to claim 1, characterized in that, The contact cup is provided with a limiting part at the bottom of the receiving cavity, and the contact piece is connected to a limiting member. The limiting member passes through the receiving cavity and is engaged with the limiting part to limit the position.

3. The contact structure of the longitudinal magnetic circuit breaker according to claim 2, characterized in that, The limiting part includes a limiting cavity with a limiting opening. The limiting member includes an extension and a limiting block. One end of the extension is connected to the contact piece, and the other end of the extension is connected to the limiting block. The extension passes through the limiting opening and causes the limiting block to engage in the limiting cavity. The limiting block is movably disposed in the limiting cavity along the axial direction of the contact cup.

4. The contact structure of the longitudinal magnetic circuit breaker according to claim 3, characterized in that, When the contact piece moves away from the cup opening to such that the limiting block and the limiting cavity abut against each other and are limited, the limiting block and the bottom wall of the contact cup have a first preset distance, and the contact piece and the cup opening have a second preset distance along the axial direction of the contact cup.

5. The contact structure of the longitudinal magnetic circuit breaker according to claim 4, characterized in that, The first preset spacing is equal to the second preset spacing.

6. The contact structure of the longitudinal magnetic circuit breaker according to claim 4, characterized in that, The value range of the first preset spacing and / or the second preset spacing is 0.8mm-1.2mm.

7. The contact structure of the longitudinal magnetic circuit breaker according to claim 1, characterized in that, The contact piece has at least two first radial grooves, which extend radially along the contact piece.

8. The contact structure of the longitudinal magnetic circuit breaker according to claim 1, characterized in that, The contact cup is provided with a limiting groove at the bottom circumferential edge of the accommodating cavity, and the spiral mechanism engages with and limits the limiting groove along the radial direction of the contact cup.

9. The contact structure of the longitudinal magnetic circuit breaker according to claim 1, characterized in that, The spiral mechanism includes at least two spiral strips arranged at equal intervals. The spiral strips are attached to the side wall of the contact cup in the accommodating cavity, and the two ends of the spiral strips respectively abut against the bottom wall of the contact plate and the contact cup in the accommodating cavity.

10. The contact structure of the longitudinal magnetic circuit breaker according to claim 1, characterized in that, The contact structure of the longitudinal magnetic circuit breaker also includes a conductive rod, which is connected along the axial direction of the contact cup to the outer wall of the contact cup on the side opposite to the contact piece.

Images