Longitudinal magnetic contact device

Abstract

The invention relates to a longitudinal magnetic contact device which can solve the problems that although an existing cup-shaped longitudinal magnetic contact can form a longitudinal magnetic field, the distribution of the magnetic field is not uniform, the center is weak, and the edge is strong, so that an arc column is contracted, and local ablation of the contact is serious. The static side contact combination structure comprises a static conducting rod, a static contact cup and a static contact piece, the static contact cup is provided with at least two first spiral grooves, the first spiral grooves are provided with first preset spiral angles, the moving side contact combination structure comprises a moving conducting rod, a moving contact cup and a moving contact piece, the moving contact cup is provided with at least two second spiral grooves, and the moving contact piece is provided with second preset spiral angles. The first spiral groove is provided with a first preset spiral angle, the second spiral groove is provided with a second preset spiral angle, the static side contact combination structure and the moving side contact combination structure are coaxially arranged at an interval, the static contact blades are opposite to the moving contact blades, the first spiral groove and the second spiral groove are configured to have the same number and consistent spiral direction, and the first preset spiral angle is larger than the second preset spiral angle.

Description

Technical Field

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

[0002] With the increasing demand for grid connection of new energy sources and flexible interconnection of power systems, mechanical DC vacuum circuit breakers are widely used in the field of DC breaking due to their advantages such as simple structure and low conduction loss. Their core function is to extinguish the arc by superimposing a reverse high-frequency current using forced zero-crossing technology. However, in high-frequency scenarios, traditional longitudinal magnetic contacts have significant drawbacks.

[0003] Although the existing cup-shaped longitudinal magnetic contact can generate a longitudinal magnetic field, the magnetic field is unevenly distributed, with a weak center and a strong edge, which leads to arc column contraction and severe local ablation of the contact.

[0004] Therefore, there is an urgent need for a simple and feasible longitudinal magnetic contact device to improve the magnetic field distribution in the arc zone, suppress eddy currents and residual magnetism, and enhance arc stability and circuit breaker breaking reliability. Summary of the Invention

[0005] Therefore, it is necessary to provide a longitudinal magnetic contact device to address the problem that although existing cup-shaped longitudinal magnetic contacts can generate a longitudinal magnetic field, the magnetic field distribution is uneven, with a weak center and a strong edge, leading to arc column contraction and severe local ablation of the contact.

[0006] This application provides a longitudinal magnetic contact device, the longitudinal magnetic contact device comprising:

[0007] A stationary contact assembly structure includes a stationary conductive rod, a stationary contact cup, and a stationary contact plate. The stationary conductive rod and the stationary contact plate are respectively connected to the axial sides of the stationary contact cup. The stationary contact cup has at least two first helical grooves and a first central axis. A first preset helical angle is provided between the first helical grooves and the first central axis.

[0008] A moving contact assembly structure includes a moving conductive rod, a moving contact cup, and a moving contact plate. The moving conductive rod and the moving contact plate are respectively connected to the axial sides of the moving contact cup. The moving contact cup has at least two second helical grooves and a second central axis. A second preset helical angle is provided between the second helical grooves and the second central axis.

[0009] The stationary contact assembly structure is coaxial with and spaced apart from the moving contact assembly structure, and the stationary contact piece is opposite to the moving contact piece; the first spiral groove and the second spiral groove are configured to have the same number and the same spiral direction, and the first preset spiral angle is greater than the second preset spiral angle.

[0010] The aforementioned longitudinal magnetic contact device, through its core design of "coaxial assembly + differentiated helical angle + unidirectional helical groove," fundamentally improves the uneven magnetic field distribution defect of traditional longitudinal magnetic contacts. The differentiated helical angle design helps compensate for the weakness of the moving-side magnetic field, creating a uniformly gradient longitudinal magnetic field in the arc region. This strengthens the magnetic field at the center of the arc region and weakens it at the edges, preventing arc column contraction and local energy concentration. Furthermore, the unidirectional helical groove ensures the superposition of the moving and stationary magnetic fields, significantly enhancing the longitudinal magnetic field strength. Coaxial assembly ensures uniform contact gaps during opening and closing, preventing arc deviation and greatly improving arc ignition stability. The overall structure requires no additional magnetic materials, simplifying the structural design and reducing processing difficulty and cost.

[0011] In one embodiment, the first preset helix angle is in the range of 20° to 80°; the second preset helix angle is in the range of 20° to 80°.

[0012] In one embodiment, the first preset helix angle ranges from 60° to 80°; the second preset helix angle ranges from 40° to 60°.

[0013] In one embodiment, the first preset helix angle is 70°; the second preset helix angle is 50°.

[0014] In one embodiment, the stationary contact piece has at least two first radial grooves that correspond one-to-one with the first helical groove, and the first radial grooves extend radially along the stationary contact piece; the moving contact piece has at least two second radial grooves that correspond one-to-one with the second helical groove, and the second radial grooves extend radially along the moving contact piece.

[0015] In one embodiment, the first radial groove has a first preset length, which is 7 / 10 to 9 / 10 of the radius of the stationary contact piece; the second radial groove has a second preset length, which is 7 / 10 to 9 / 10 of the radius of the moving contact piece.

[0016] In one embodiment, the first radial groove has a first preset width, the value of which is in the range of 2cm-3cm; the second radial groove has a second preset width, the value of which is in the range of 2cm-3cm.

[0017] In one embodiment, the stationary contact cup has at least two third radial grooves along its axial direction away from the stationary contact piece on its end face. Each third radial groove is connected to each of the first spiral grooves in a one-to-one correspondence. The third radial grooves extend radially along the end face of the stationary contact cup away from the stationary contact piece. The moving contact cup has at least two fourth radial grooves along its axial direction away from the stationary contact piece on its end face. Each fourth radial groove is connected to each of the second spiral grooves in a one-to-one correspondence. The fourth radial grooves extend radially along the end face of the moving contact cup away from the moving contact piece.

[0018] In one embodiment, the number of both the first spiral groove and the second spiral groove is configured to be four.

[0019] In one embodiment, both the stationary contact cup and the moving contact cup are made of CuCr50 copper-chromium alloy. Attached Figure Description

[0020] Figure 1 This is a front view of a longitudinal magnetic contact device according to an embodiment of this application.

[0021] Figure 2 This is a schematic diagram of the longitudinal magnetic contact device in one embodiment of this application.

[0022] Figure 3 for Figure 2 An exploded view of the stationary contact assembly structure of the longitudinal magnetic contact device shown.

[0023] Figure 4 for Figure 2 An exploded view of the moving side contact assembly structure of the longitudinal magnetic contact device shown.

[0024] Figure 5 for Figure 3 The diagram shows the structure of the stationary contact cup of the longitudinal magnetic contact device.

[0025] Figure 6 for Figure 4 The diagram shows the structure of the moving contact cup of the longitudinal magnetic contact device.

[0026] Explanation of icon numbers

[0027] 10. Longitudinal magnetic contact device; 10a. Arc zone; 100. Stationary side contact assembly structure; 110. Stationary conductive rod; 120. Stationary contact cup; 120a. First central axis; M1. First vertical line; X1. Intersection of the first vertical lines; M2. First connecting line; 121. First spiral groove; α. First preset spiral angle; 122. Third radial groove; 130. Stationary contact piece; 131. First radial groove; L1. First preset length; D1. First preset width; 200. Moving side contact assembly structure; 210. Moving conductive rod; 220. Moving contact cup; 220a. Second central axis; M3. Second vertical line; X2. Intersection of the second vertical lines; M4. Second connecting line; 221. Second spiral groove; β. Second preset spiral angle; 222. Fourth radial groove; 230. Moving contact piece; 231. Second radial groove; L2. Second preset length; D2. Second preset width. Detailed Implementation

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] According to one embodiment of this application, this application provides a longitudinal magnetic contact device 10, which aims to solve the problems of uneven magnetic field distribution, significant residual magnetism effect, and unstable arc ignition in the arc region 10a of traditional longitudinal magnetic contacts, thereby improving the breaking capacity and reliability of DC vacuum circuit breakers.

[0035] Specifically, please refer to Figure 1 and Figure 2 The longitudinal magnetic contact device 10 may include a stationary side contact assembly structure 100 and a moving side contact assembly structure 200, which together form a longitudinal magnetic contact system with optimized magnetic field and stable arc, and can be applied in vacuum circuit breakers.

[0036] The stationary contact assembly structure 100 includes a stationary conductive rod 110, a stationary contact cup 120, and a stationary contact plate 130, all three coaxially assembled to ensure the stability of current conduction and magnetic field generation. The stationary conductive rod 110 and the stationary contact plate 130 are respectively connected to the axial sides of the stationary contact cup 120, with the stationary conductive rod 110 serving as the current input channel. The stationary contact cup 120 is the core magnetic field generating component, and it has at least two first spiral grooves 121. The stationary contact cup 120 has a first central axis 120a, and a first preset spiral angle α is provided between the first spiral grooves 121 and the first central axis 120a. The first spiral grooves 121 are used to guide the current to form a spiral path, thereby generating a longitudinal magnetic field.

[0037] The moving-side contact assembly structure 200 is symmetrically adapted to the stationary-side structure. Specifically, the moving-side contact assembly structure 200 includes a moving conductive rod 210, a moving contact cup 220, and a moving contact piece 230, all three being coaxially assembled. The moving conductive rod 210 drives the moving contact cup 220 and the moving contact piece 230 to perform opening and closing actions. The moving conductive rod 210 and the moving contact piece 230 are respectively connected to the axial sides of the moving contact cup 220. The moving contact cup 220 has at least two second spiral grooves 221 and a second central axis 220a. A second preset spiral angle β is provided between the second spiral grooves 221 and the second central axis 220a. The second spiral grooves 221 and the first spiral grooves 121 work together to optimize the magnetic field of the arc region 10a.

[0038] The stationary contact assembly structure 100 and the moving contact assembly structure 200 are coaxial and spaced apart, with the stationary contact piece 130 and the moving contact piece 230 facing each other, thus forming an arc gap (arc region 10a). The first helical groove 121 and the second helical groove 221 are configured in the same number and with the same helical direction, which ensures the superposition and enhancement of the magnetic field. The first preset helical angle α is greater than the second preset helical angle β, thus compensating for the weakness of the moving side magnetic field through differential angle design, so that the aforementioned arc region 10a forms a longitudinal magnetic field with a uniform gradient.

[0039] Please see Figure 5 It should be noted that one end of the first spiral groove 121 has a first perpendicular line M1 and the first central axis 120a with an intersection point X1. The first perpendicular line intersection point X1 and the other end have a first connecting line M2. The aforementioned first preset spiral angle α refers to the angle between the first perpendicular line M1 and the first connecting line M2.

[0040] Please see Figure 6It should be noted that one end of the second spiral groove 221 has a second perpendicular line M3 and a second perpendicular line intersection point X2 between it and the second central axis 220a. The second perpendicular line intersection point X2 and the other end have a second connecting line M4. The aforementioned second preset spiral angle β refers to the angle between the second perpendicular line M3 and the second connecting line M4.

[0041] The longitudinal magnetic contact device 10 described in this application fundamentally improves upon the uneven magnetic field distribution defect of traditional longitudinal magnetic contacts through its core design of "coaxial assembly + differentiated helical angle + unidirectional helical groove". The differentiated helical angle design helps compensate for the weak magnetic field on the moving side, enabling the arc region 10a to form a longitudinal magnetic field with a uniform gradient. This strengthens the central magnetic field and weakens the edge magnetic field in the arc region 10a, preventing arc column contraction and local energy concentration. Furthermore, the unidirectional helical groove ensures the superposition of the magnetic fields on the moving and stationary sides, significantly improving the longitudinal magnetic field strength. Coaxial assembly ensures uniform contact gap during opening and closing, preventing arc deviation and greatly improving arc ignition stability. The overall structure requires no additional magnetic materials, simplifying the structural design and reducing processing difficulty and cost.

[0042] Optionally, the static conductive rod 110 and / or the dynamic conductive rod 210 are preferably made of copper with high conductivity.

[0043] In some embodiments, the first preset helix angle α can be in the range of 20° to 80°. For example, the first preset helix angle α can be, but is not limited to, 20°, 30°, 40°, 50°, 60°, 70°, or 80°.

[0044] In some embodiments, the value range of the second preset helix angle β can be 20° to 80°, and the second preset helix angle βα can be, but is not limited to, 20°, 30°, 40°, 50°, 60°, 70°, or 80°.

[0045] It should be noted that, according to the above embodiments of this application, the user can set the values ​​of the first preset helix angle α and the second preset helix angle β within the range of 20° to 80° according to actual needs, as long as the first preset helix angle α is greater than the second preset helix angle β.

[0046] It is worth noting that, according to the above embodiments of this application, setting the first preset helix angle α and the second preset helix angle β within the range of 20° to 80° helps to ensure that the axial component of the longitudinal magnetic field is dominant, effectively driving the arc to rotate and spread, while avoiding the problem that the magnetic field strength is insufficient due to the angle being too small, or that the processing technology is complicated and the current conduction path is blocked due to the angle being too large, thus adapting to the requirements of DC vacuum circuit breakers with different voltage levels and current parameters.

[0047] It should be noted that the values ​​of the first preset helix angle α and the second preset helix angle β are set within the range of 20° to 80°, which helps to make the longitudinal magnetic contact device 10 have strong adaptability to different scenarios. The helix angle parameters can be flexibly adjusted according to the actual breaking current and the arc-extinguishing chamber structure size without redesigning the overall structure. At the same time, the reasonable angle range ensures a balance between magnetic field performance and processing feasibility, which not only meets the technical requirements but also reduces the difficulty of large-scale production.

[0048] In some embodiments, the first preset helix angle α ranges from 60° to 80°, such as 60°, 70°, 80°, etc. The second preset helix angle β ranges from 40° to 60°, such as 40°, 50°, 60°, etc. Preferably, the first preset helix angle α is 70° and the second preset helix angle β is 50°.

[0049] Specifically, the combination of the first preset helix angle α ranging from 60° to 80° and the second preset helix angle β ranging from 40° to 60° helps to maximize the uniformity of the magnetic field gradient. In particular, the design of the first preset helix angle α being 70° and the second preset helix angle β being 50° helps to optimize the magnetic field distribution in the arc region 10a.

[0050] More specifically, the 50° and 70° angle difference results in a slightly weaker moving-side magnetic field and a slightly stronger stationary-side magnetic field, which can form a gradient-distributed longitudinal magnetic field in the arc region 10a. This enhances the magnetic induction intensity in the central region of the arc column and weakens the magnetic field in the edge region, which is conducive to arc column diffusion and energy distribution balance. This effectively reduces arc voltage fluctuations and contact surface temperature rise. Consequently, the eddy current effect is weaker under this parameter combination, and the amount of residual magnetism accumulation is small, effectively reducing the probability of arc reignition and improving the breaking reliability in vacuum circuit breaker applications.

[0051] Please see Figure 1 and Figure 2 In some embodiments, the stationary conductive rod 110 and the moving conductive rod 210 are coaxially arranged, thus ensuring that the central axes of the entire contact system (the first central axis 120a and the second central axis 220a) coincide. This design makes the current conduction path symmetrical, the magnetic field generation is without offset, avoids magnetic field distortion in the arc region 10a caused by axis deviation, and at the same time ensures accurate contact of the contact plates during opening and closing, reducing the problem of uneven contact erosion.

[0052] Specifically, the coaxial arrangement of the stationary conductive rod 110 and the moving conductive rod 210 helps improve the structural stability and operational reliability of the contact system, ensuring symmetrical and uniform current conduction on both sides and avoiding eddy currents and temperature rise caused by excessive local current density. Furthermore, the magnetic field distribution remains unbiased, ensuring the arc remains stably burning in the center region of the contact, reducing arc root drift and localized ablation; precise contact plates align during opening and closing, extending contact life and reducing maintenance frequency.

[0053] Please see Figure 1 and Figure 2 In some embodiments, the number of first spiral grooves 121 and the number of second spiral grooves 221 are both configured to be 4, and they are evenly distributed on the cup wall of the corresponding contact cup.

[0054] Specifically, the design of four spiral grooves not only ensures uniform current path distribution and significant magnetic field superposition effect, guaranteeing magnetic field strength, but also avoids the problems of reduced contact cup structural strength due to too many grooves or uneven magnetic field distribution due to too few grooves. Furthermore, the uniformly distributed groove structure ensures balanced stress on the contact cup, making it less prone to deformation under high-frequency switching thermal cycling and mechanical vibration, ensuring stable magnetic field performance during long-term use and improving the durability and consistency of the device.

[0055] In some embodiments, both the stationary contact cup 120 and the moving contact cup 220 are made of CuCr50 copper-chromium alloy material, which consists of 50% copper and 50% chromium. It combines the high conductivity of copper with the high melting point and ablation resistance of chromium, making it a preferred material for the longitudinal magnetic contact device 10.

[0056] Specifically, the selection of CuCr50 copper-chromium alloy material effectively solves the pain points of traditional pure copper contacts. The addition of chromium significantly improves the high-temperature resistance and ablation resistance of the contact cup, reduces the erosion of the contact surface by the electric arc, and extends the service life. The alloy properties suppress the eddy current effect under high-frequency current, reduce the amount of residual magnetism accumulation, and enable the dielectric strength after the arc to recover quickly, preventing the arc from reigniting. The high conductivity of copper ensures smooth current conduction, meets the requirements of high-current breaking, and achieves a balance between conductivity and antimagnetic performance.

[0057] Please see Figure 3 In some embodiments, the stationary contact piece 130 has at least two first radial grooves 131 that correspond one-to-one with the first helical grooves 121, and the first radial grooves 131 extend radially along the stationary contact piece 130. The moving contact piece 230 has at least two second radial grooves 231 that correspond one-to-one with the second helical grooves 221, and the second radial grooves 231 extend radially along the moving contact piece 230. In this way, the radial grooves and helical grooves correspond one-to-one, which helps to form a continuous current path and guide the current to smoothly transition from the helical grooves of the contact cup to the contact piece.

[0058] Specifically, the corresponding connection design of the first radial groove 131 and the first spiral groove 121 optimizes the current distribution, avoids the current concentration on the surface of the stationary contact piece 130, makes the radial current density more uniform, and weakens the arc column contraction effect; guides the arc to spread evenly along the radial groove, increases the arc root coverage area, reduces the anode temperature rise, and reduces the contact ablation area; at the same time, the continuous current channel reduces the eddy current generated by the current change, further suppresses the residual magnetism effect, and improves the breaking performance in vacuum circuit breaker applications.

[0059] Please continue reading. Figure 3 In some embodiments, the first radial groove 131 is provided with a first preset length L1, which is 7 / 10 to 9 / 10 of the radius length of the stationary contact piece 130. For example, the first preset length L1 is 7 / 10, 4 / 5 or 9 / 10 of the radius length of the stationary contact piece 130.

[0060] Please see Figure 4 In some embodiments, the second radial groove 231 has a second preset length L2, which is 7 / 10 to 9 / 10 of the radius length of the moving contact piece 230. For example, the second preset length L2 is 7 / 10, 4 / 5, or 9 / 10 of the radius length of the moving contact piece 230.

[0061] According to the above embodiments of this application, the 7 / 10-9 / 10 length design ensures optimized current distribution while avoiding insufficient structural strength of the contact piece due to excessive slot length. Specifically, the reasonable radial slot length design achieves a balance between performance and structural strength. The 7 / 10-9 / 10 radius ratio effectively covers the main current conduction area of ​​the contact piece, resulting in uniform current distribution and optimal arc column diffusion effect. At the same time, the reserved 1 / 10-3 / 10 edge area ensures the structural integrity of the contact piece, preventing breakage or deformation of the contact piece under the impact of opening and closing due to excessive slot length, thus ensuring long-term stable operation of the device.

[0062] Please continue reading. Figure 3 In some embodiments, the first radial groove 131 is provided with a first preset width D1, and the value of the first preset width D1 is in the range of 2cm-3cm. For example, the first preset width D1 can be 2cm, 2.2cm, 2.4cm, 2.6cm, 2.8cm or 3cm, etc.

[0063] Please see Figure 4 In some embodiments, the second radial groove 231 is provided with a second preset width D2, the value of which is 2cm-3cm. For example, the second preset width D2 can be 2cm, 2.2cm, 2.4cm, 2.6cm, 2.8cm or 3cm, etc.

[0064] According to the above embodiments of this application, the 2cm-3cm width range helps to adapt to the contact plate sizes of most DC vacuum circuit breakers, ensuring both current carrying efficiency and preventing excessive arc root dispersion caused by excessively wide slots. Specifically, the 2cm-3cm radial slot width design balances current conduction and arc stability. Too small a width leads to a narrow current path, increased resistance, and excessive temperature rise; too large a width causes excessive arc root dispersion, making it difficult to concentrate and extinguish the arc energy. Within the 2cm-3cm radial slot width range, current conduction is smooth, the arc rotates stably, and the arc voltage fluctuation amplitude is effectively controlled, significantly improving the stability and reliability of the breaking process.

[0065] Please see Figure 3 In some embodiments, the stationary contact cup 120 has at least two third radial grooves 122 formed on its end face away from the stationary contact piece 130 along its axial direction. Each third radial groove 122 is connected to a first helical groove 121 in a one-to-one correspondence. The third radial grooves 122 extend radially along the end face of the stationary contact cup 120 away from the stationary contact piece 130. The first radial grooves 131, the third radial grooves 122, and the first helical grooves 121 form a complete current guiding channel.

[0066] Please see Figure 4 In some embodiments, the moving contact cup 220 has at least two fourth radial grooves 222 formed on its end face away from the stationary contact piece 130 along its axial direction. Each fourth radial groove 222 is connected to each second helical groove 221 in a one-to-one correspondence. The fourth radial grooves 222 extend radially along the end face of the moving contact cup 220 away from the moving contact piece 230. The second radial grooves 231, the fourth radial grooves 222, and the second helical grooves 221 and 2221 form a complete current guiding channel.

[0067] According to the above embodiments of this application, the design of the third radial groove 122 and the fourth radial groove 222 helps to further optimize the current path, allowing the current to be introduced from the conductive rod, smoothly enter the spiral groove through the end face radial groove, and then be discharged through the contact plate radial groove, avoiding the formation of eddy currents or circulating currents at the end of the contact cup. The smoothness of the current path reduces the magnetic field response hysteresis, enabling the magnetic field in the arc region 10a to quickly follow the current change and improve the arc extinguishing speed; at the same time, the end face radial groove can also play a heat dissipation role, reducing the temperature rise accumulation at the end of the contact cup and delaying material aging.

[0068] 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.

[0069] 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 longitudinal magnetic contactor device, characterized by, The longitudinal magnetic contact device includes: A stationary contact assembly structure includes a stationary conductive rod, a stationary contact cup, and a stationary contact plate. The stationary conductive rod and the stationary contact plate are respectively connected to the axial sides of the stationary contact cup. The stationary contact cup has at least two first helical grooves and a first central axis. A first preset helical angle is provided between the first helical grooves and the first central axis. A moving contact assembly structure includes a moving conductive rod, a moving contact cup, and a moving contact plate. The moving conductive rod and the moving contact plate are respectively connected to the axial sides of the moving contact cup. The moving contact cup has at least two second helical grooves and a second central axis. A second preset helical angle is provided between the second helical grooves and the second central axis. The stationary contact assembly structure is coaxial with and spaced apart from the moving contact assembly structure, and the stationary contact piece is opposite to the moving contact piece; the first spiral groove and the second spiral groove are configured to have the same number and the same spiral direction, and the first preset spiral angle is greater than the second preset spiral angle.

2. The longitudinal magnetic contact device according to claim 1, characterized in that, The first preset helix angle has a value range of 20° to 80°; the second preset helix angle has a value range of 20° to 80°.

3. The longitudinal magnetic contact device according to claim 1, characterized in that, The first preset helix angle has a value range of 60° to 80°; the second preset helix angle has a value range of 40° to 60°.

4. The longitudinal magnetic contact device according to claim 1, characterized in that, The first preset helix angle is 70°; the second preset helix angle is 50°.

5. The longitudinal magnetic contact device according to claim 1, characterized in that, The stationary contact piece has at least two first radial grooves that correspond one-to-one with the first spiral groove, and the first radial grooves extend radially along the stationary contact piece; the moving contact piece has at least two second radial grooves that correspond one-to-one with the second spiral groove, and the second radial grooves extend radially along the moving contact piece.

6. The longitudinal magnetic contact device according to claim 5, characterized in that, The first radial groove has a first preset length, which is 7 / 10 to 9 / 10 of the radius of the stationary contact piece; the second radial groove has a second preset length, which is 7 / 10 to 9 / 10 of the radius of the moving contact piece.

7. The longitudinal magnetic contact device according to claim 5, characterized in that, The first radial groove has a first preset width, the value of which is 2cm-3cm; the second radial groove has a second preset width, the value of which is 2cm-3cm.

8. The longitudinal magnetic contact device according to claim 1, characterized in that, The stationary contact cup has at least two third radial grooves along the axial direction of the stationary contact cup away from the end face of the stationary contact piece. Each of the third radial grooves is connected to each of the first spiral grooves in a one-to-one correspondence. The third radial grooves extend radially along the end face of the stationary contact cup away from the stationary contact piece. The moving contact cup has at least two fourth radial grooves on its end face away from the stationary contact piece along the axial direction of the moving contact cup. Each of the fourth radial grooves is connected to each of the second spiral grooves in a one-to-one correspondence. The fourth radial grooves extend radially along the end face of the moving contact cup away from the moving contact piece.

9. The longitudinal magnetic contact device according to any one of claims 1-8, characterized in that, The number of the first spiral groove and the number of the second spiral groove are both configured to be 4.

10. The longitudinal magnetic contact device according to any one of claims 1-8, characterized in that, Both the stationary contact cup and the moving contact cup are made of CuCr50 copper-chromium alloy.

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