Magnetic ring and direct current contactor

Abstract

A magnetic ring and a DC contactor are disclosed. The thickness of the magnetic ring gradually increases along the direction near its central axis, giving it a spindle shape that is thicker in the middle and thinner at the edges. The inner and outer sidewalls of the magnetic ring are magnetic poles with opposite magnetic properties. The area connecting the inner and outer sidewalls is the annular surface of the magnetic ring. The magnetic ring is divided into multiple magnetic domains along its circumference. On the annular surface, the magnetic field lines in each domain point towards or away from the inner sidewall. In this invention, the magnetic ring can form a 360° surrounding magnetic loop, ensuring uniform magnetic force applied to the moving iron core and preventing the moving iron core from shifting during movement. The spindle shape of the magnetic ring, with its thicker middle and thinner edges, avoids local saturation of the magnetic field on the inner sidewall by increasing its area. When applied to a DC contactor, this simplifies the assembly process.

Description

Technical Field

[0001] This invention relates to the field of low-voltage electrical appliances, and more specifically to a magnetic ring and a DC contactor. Background Technology

[0002] DC contactors, as key control devices in charging piles, are widely used. However, during long-term use, their high heat generation and energy consumption affect the normal operation of the system. To make DC contactors more energy-efficient and environmentally friendly, magnetic latching structures are commonly used. In existing products, the magnetic latching structure uses magnets on the coil frame, with the magnets and iron core forming a closed magnetic circuit. However, DC contactors using magnetic latching structures have the following drawbacks: Firstly, using more than two magnets makes it impossible to form a uniform magnetic field, leading to dynamic... Uneven force on the core or armature causes deviations in the movement of the moving core or armature, requiring manual intervention or tooling to fix the position of the magnet against the repulsive force before normal assembly, making automated assembly difficult. Secondly, the magnetic poles of existing magnetic rings are usually distributed on the annular surface, or the magnetic ring is divided into N and S poles along the circumference, with the N and S poles alternating, which cannot be directly applied to DC contactors. Thirdly, existing magnetic rings are usually uniformly thick circular rings. When the inner and outer ring sidewalls are two magnetic poles with opposite polarities, the inner ring sidewall is limited by its area and is prone to local magnetic saturation. Summary of the Invention

[0003] The purpose of this invention is to overcome at least one defect of the prior art and to provide a magnetic ring and a DC contactor.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] The present invention provides a magnetic ring, wherein the thickness of the magnetic ring gradually increases along the direction close to the central axis, making the magnetic ring spindle-shaped with a thicker middle and thinner edges. The inner and outer ring sidewalls of the magnetic ring are magnetic poles with opposite magnetic properties. The area connecting the inner and outer ring sidewalls is the annular surface of the magnetic ring. The magnetic ring is divided into multiple magnetic domains along the circumferential direction. On the annular surface, the magnetic field lines in each magnetic domain point towards or away from the inner ring sidewall.

[0006] Furthermore, the inner ring sidewall is the N pole, and the outer ring sidewall is the S pole.

[0007] Furthermore, the area of ​​the inner ring sidewall is equal to the area of ​​the outer ring sidewall.

[0008] Furthermore, on the annular surface, the direction of the magnetic field lines in each magnetic domain is the radial direction of the annular surface.

[0009] Furthermore, the magnetic ring is divided into multiple uniform magnetic domains along the circumferential direction, and each magnetic domain is fan-shaped on the annular surface.

[0010] Furthermore, on the annular surface, the magnetic domains are divided into bar magnetic domains and fan-shaped magnetic domains. A plurality of bar magnetic domains are arranged at equal intervals along the circumferential direction of the annular surface, and a fan-shaped magnetic domain is arranged between two adjacent bar magnetic domains.

[0011] Furthermore, on the annular surface, the angle between the magnetic field lines in each magnetic domain and the radial lines of the magnetic ring ranges from 0 to 40°.

[0012] Furthermore, the two annular surfaces are divided into a first surface and a second surface, and the surface regions of the same magnetic domain corresponding to the first surface and the second surface are misaligned, so that the surface shapes of the same magnetic domain corresponding to the inner ring sidewall and the outer ring sidewall are rectangular and parallelogram, respectively.

[0013] The present invention also provides a DC contactor, including a housing, wherein an electromagnetic system is disposed within the housing, the electromagnetic system including an armature assembly and two coil assemblies, the two coil assemblies being arranged along the axial direction of the housing for driving the armature assembly to move linearly, the electromagnetic system further including a magnetic ring as described above, the magnetic ring being located between the two coil assemblies along the axial direction of the housing, and the moving iron core of the armature assembly sliding in the middle of the two coil assemblies and the magnetic ring.

[0014] Preferably, each coil assembly includes a coil frame and a coil wound on the coil frame, the moving iron core slides in the middle of the two coil frames, and the inner ring sidewall of the magnetic ring slides in contact with the moving iron core.

[0015] Preferably, the two coil frames are an integral structure, and the middle of the integral structure has a mounting groove for assembling the magnetic ring.

[0016] Preferably, the two coil frames are inserted into each other near the magnetic ring to form an insertion structure. The insertion structure is located at the center of one end of the coil frame, so that the insertion structure is located between the inner ring sidewall of the magnetic ring and the outer sidewall of the moving iron core.

[0017] The magnetic ring and DC contactor of the present invention have magnetic poles that can form a 360° surrounding magnetic circuit on the inner and outer ring sidewalls, respectively, which can ensure that a uniform magnetic force is applied to the moving iron core and avoid the moving iron core from deviating during movement. The magnetic ring adopts a spindle shape with a thicker middle and thinner edges. By increasing the area of ​​the inner ring sidewall, local saturation of the magnetic field on the inner ring sidewall is avoided. When applied to the DC contactor, the magnetic ring is assembled as an indivisible whole, avoiding assembly deviation caused by the repulsive force between multiple permanent magnets and simplifying the assembly process.

[0018] In addition, the magnetic domains are divided into bar domains and sector domains. The bar domains and sector domains are evenly distributed and can form a 360° radial magnetic loop along the central axis of the magnetic ring. This ensures that a uniform magnetic force is applied to the moving iron core and prevents the moving iron core from shifting during movement.

[0019] In addition, the magnetic moment direction within the magnetic domain is set at an angle to the radial lines of the magnetic ring, which helps to extend the magnetic torque. At the same time, the angled magnetic torque can generate a component force along the central axis of the magnetic ring, either clockwise or counterclockwise. This component force can stabilize the moving iron core, prevent rotation, and improve the stability of the entire contact system. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the DC contactor in this invention. Figure 1 ;

[0021] Figure 2 This is a schematic diagram of the DC contactor in this invention. Figure 2 ;

[0022] Figure 3 This is the cross-section of the DC contactor in this invention. Figure 1 ;

[0023] Figure 4 This is the cross-section of the DC contactor in this invention. Figure 2 ;

[0024] Figure 5 This is a schematic diagram of the magnetic ring structure in this invention. Figure 1 ;

[0025] Figure 6 This is a schematic diagram of the magnetic ring structure in this invention. Figure 2 ;

[0026] Figure 7 This is a schematic diagram of the magnetic ring structure in the first embodiment of the present invention;

[0027] Figure 8 This is a front view of the magnetic ring in the first embodiment of the present invention;

[0028] Figure 9 This is a front view of the magnetic ring in the second embodiment of the present invention;

[0029] Figure 10 This is a front view of the magnetic ring in the third embodiment of the present invention;

[0030] Figure 11 This is a schematic diagram of the magnetic ring structure in the fourth embodiment of the present invention;

[0031] Figure 12 This is a schematic diagram of the magnetic ring manufacturing equipment in this invention;

[0032] Figure 13 This is a cross-sectional view of the magnetic ring manufacturing equipment in this invention;

[0033] Figure 14 This is a schematic diagram of the upper die head in this invention;

[0034] Figure 15 This is a schematic diagram of the magnetic cylinder in this invention;

[0035] Figure 16 This is a schematic diagram of the magnetic core structure in this invention;

[0036] Figure 17 This is a schematic diagram of the structure of the magnetic cylinder, magnetic core, shielding cover, and mold cavity body in this invention. Figure 1 ;

[0037] Figure 18 yes Figure 17 Schematic diagram of the middle magnetic core;

[0038] Figure 19 yes Figure 17 Schematic diagram of the structure of the shielding cover;

[0039] Figure 20 This is a schematic diagram of the structure of the magnetic cylinder, magnetic core, shielding cover, and mold cavity body in this invention. Figure 2 ;

[0040] Figure 21 yes Figure 20 Schematic diagram of the middle magnetic core;

[0041] Figure 22 yes Figure 20 Schematic diagram of the structure of the shielding cover;

[0042] Figure 23 yes Figure 20 Schematic diagram of the structure of the medium-conducting magnetic rod;

[0043] Figure label:

[0044] 1-Outer shell, 101-Bottom shell, 102-Top cover, 2-Contact system, 21-Stationary contact assembly, 211-Lead-out terminal, 3-Armature assembly, 31-Moving iron core, 4-Coil assembly, 42-Coil, 44-Magnetic ring, 440-Magnetic domain, 4401-Bar magnetic domain, 4402-Sector magnetic domain, 441-Inner ring sidewall, 442-Outer ring sidewall, 443-Annular surface, 444-Central axis, 445-Radial, 5-Inner shell, 61-Support structure, 6 211-Mold cavity body, 6212-Upper mold head, 6213-Lower mold head, 6214-Annular groove, 6221-Upper oil cylinder, 6222-Lower oil cylinder, 631-Magnetic yoke, 632-Magnetic field generator, 633-Magnetic core, 6331-First end of magnetic core, 6332-Second end of magnetic core, 634-Magnetic guide cylinder, 6341-Gear part, 635-Magnetic guide rod, 636-Shielding cover, 6361-Notch groove, 65-Motor, 660-Magnetic powder mixture. Detailed Implementation

[0045] The following embodiments, in conjunction with the accompanying drawings, further illustrate specific implementations of the magnetic ring and DC contactor of the present invention. The magnetic ring and DC contactor of the present invention are not limited to the descriptions in the following embodiments.

[0046] like Figure 1-4 As shown, a DC contactor includes a housing 1. An electromagnetic system and a contact system 2 are arranged axially within the housing 1. The electromagnetic system includes an armature assembly 3 and two coil assemblies 4. The two coil assemblies 4 are arranged axially along the housing 1. Each coil assembly 4 includes a coil frame and a coil 42 wound around the coil frame. The armature assembly 3 includes a moving iron core 31 and a yoke. The moving iron core 31 moves up and down along the axial direction of the housing 1 at the center of the coil frame. The yoke is fixedly arranged and spaced apart from the moving iron core 31. When energized, the coil assembly 4 generates a driving force to drive the moving iron core 31, causing the moving iron core 31 to move along the axial direction of the coil frame. The electromagnetic system typically includes multiple permanent magnets symmetrically distributed along the circumference of the moving iron core 31, which work together with the coil assembly 4 to drive the moving iron core 31. The contact system 2 includes a moving contact assembly and a stationary contact assembly 21 that cooperate with each other. The stationary contact assembly 21 is fixed to one end of the housing 1 away from the electromagnetic system. The moving contact assembly is connected to the armature assembly 3. The moving iron core 31 drives the moving contact assembly to contact or separate from the stationary contact assembly 21. Typically, the contact system 2 also includes an arc extinguishing assembly, which extinguishes the arc generated by the moving contact assembly and the stationary contact assembly 21.

[0047] The improvement of this application lies in providing a magnetic ring 44 capable of replacing multiple permanent magnets. The thickness of the magnetic ring 44 gradually increases along the direction close to the central axis 444, making the magnetic ring 44 spindle-shaped with a thicker middle and thinner edges. The inner ring sidewall 441 and the outer ring sidewall 442 of the magnetic ring 44 are magnetic poles with opposite magnetic properties. The area between the inner ring sidewall 441 and the outer ring sidewall 442 is the annular surface 443 of the magnetic ring 44. The magnetic ring 44 is divided into multiple magnetic domains 440 along the circumferential direction. On the annular surface 443, the magnetic field lines in each magnetic domain 440 point towards or away from the inner ring sidewall 441. The direction of the magnetic field lines is shown in [reference needed]. Figure 7-11 The direction indicated by the middle arrow.

[0048] Thus, the magnetic poles of the magnetic ring 44 can form a 360° surrounding magnetic loop on the inner ring sidewall 441 and the outer ring sidewall 442, which can ensure that a uniform magnetic force is applied to the moving iron core 31 and prevent the moving iron core 31 from shifting during movement. The magnetic ring 44 adopts a spindle shape with a thicker middle and thinner edges. By increasing the area of ​​the inner ring sidewall 441, local saturation of the magnetic field of the inner ring sidewall 441 is avoided. When applied to DC contactors, the magnetic ring 44 is assembled as an indivisible whole, avoiding assembly deviation caused by the repulsive force between multiple permanent magnets and simplifying the assembly process.

[0049] Specifically, the inner ring sidewall 441 is the N pole and the outer ring sidewall 442 is the S pole. The area of ​​the inner ring sidewall 441 is less than or equal to the area of ​​the outer ring sidewall 442. Preferably, the area of ​​the inner ring sidewall 441 is equal to the area of ​​the outer ring sidewall 442 to further avoid magnetic field saturation of the inner ring sidewall 441.

[0050] Preferably, on the annular surface 443, the magnetic field lines in each magnetic domain 440 are along the radial direction of the radial line 445 of the annular surface 443. The radial direction of the radial line 445 is radial to the annular surface 443, which can form a 360° radially encircling magnetic loop along the central axis of the magnetic ring 44. This ensures that a uniform magnetic force is applied to the moving iron core 31 and prevents the moving iron core 31 from deviating during movement. Of course, the magnetic field lines in the magnetic domain 440 can also be along the radial line 445 of the annular surface 443 at an angle. Preferably, the angle between the direction of the magnetic moment within the magnetic domain 440 and the radial line 445 of the magnetic ring 44 is between 0° and 40°. This angled arrangement of the magnetic moment within the magnetic domain 440 and the radial line 445 of the magnetic ring 44 helps to extend the magnetic torque. At the same time, the angled magnetic force can generate a clockwise or counterclockwise component along the central axis 444 of the magnetic ring 44. This component can stabilize the moving iron core 31, prevent rotation, and improve the stability of the entire contact system 2.

[0051] Furthermore, the two annular surfaces 443 are divided into a first surface and a second surface. The surface regions of the same magnetic domain 440 corresponding to the first surface and the second surface are misaligned, so that the surface shapes of the same magnetic domain 440 corresponding to the inner ring sidewall 441 and the outer ring sidewall 442 are approximately rectangular and approximately parallelogram, respectively. This is beneficial for extending the magnetic torque.

[0052] Combination Figure 5-8 A specific embodiment of the first magnetic ring 44 is provided.

[0053] like Figure 5 As shown, the thickness of the magnetic ring 44 gradually increases along the direction close to the central axis 444, making the magnetic ring 44 spindle-shaped with a thicker middle and thinner edges. That is, along the axial direction of the magnetic ring 44, the height of the inner ring sidewall 441 of the magnetic ring 44 is greater than the height of the outer ring sidewall 442. The inner ring sidewall 441 and the outer ring sidewall 442 of the magnetic ring 44 are magnetic poles with opposite magnetic properties. Preferably, the area of ​​the inner ring sidewall 441 is approximately the same as the area of ​​the outer ring sidewall 442. Increasing the area of ​​the inner ring sidewall 441 can prevent local saturation of the magnetic field of the inner ring sidewall 441. Figure 7 , 8 As shown, the annular surface 443 connecting the inner ring sidewall 441 and the outer ring sidewall 442 are respectively the first surface and the second surface. The magnetic ring 44 is divided into a plurality of uniform magnetic domains 440 along the circumferential direction. On the annular surface 443, each magnetic domain 440 is fan-shaped. That is, on the annular surface 443, each magnetic domain 440 includes an inner ring sidewall 441 and an outer ring sidewall 442 with the same central angle. The endpoints of the inner ring sidewall 441 and the outer ring sidewall 442 are connected along the radial line 445 of the annular surface 443 to form a closed shape. This shape is a fan-shaped ring. The magnetic lines of force in each magnetic domain 440 point towards or away from the inner ring sidewall 441. In this embodiment, the direction of the magnetic lines of force is the direction of the radial line 445 of the annular surface 443. The surface shape of each magnetic domain 440 corresponding to the inner ring sidewall 441 and the outer ring sidewall 442 is approximately rectangular.

[0054] In this embodiment, the magnetic ring 44 has uniformly distributed magnetic domains 440. When the magnetic ring 44 is assembled, the magnetic force generated by each magnetic domain 440 is relatively equal. The moving iron core 31, the magnetic ring 44 and the inner shell 5 form a 360° radial magnetic field along the central axis 444, which can ensure that the moving iron core 31 can be subjected to uniform magnetic force and will not generate an eccentric driving force. When forming the magnetic ring 44, the orientation direction of the magnetic ring 44 is along the radial line 445 of the magnetic ring 44 and points to the central axis 444 of the magnetic ring 44.

[0055] A specific embodiment of the second magnetic ring 44 is provided.

[0056] like Figure 5 , 6As shown in Figure 9, the magnetic ring 44 is the same as in the first embodiment, and is spindle-shaped with a thicker middle and thinner edges. The inner ring sidewall 441 of the magnetic ring 44 is the N pole, and the outer ring sidewall 442 of the magnetic ring 44 is the S pole.

[0057] Unlike the first embodiment, as Figure 9 As shown, the magnetic ring 44 is divided into multiple magnetic domains 440 along the circumferential direction. Each magnetic domain 440 is further divided into strip domains 4401 and sector domains 4402. Specifically, the strip domains 4401 are approximately rectangular on the annular surface 443, and rectangular on both the inner and outer ring sidewalls 441 and 442. The sector domains 4402 are sector-shaped on the annular surface 443 and rectangular on the outer ring sidewall 442. On the same annular surface 443 of the magnetic ring 44, multiple strip domains 4401 are evenly spaced along the circumferential direction of the magnetic ring 44, with a sector domain 4402 positioned between every two adjacent strip domains 4401. This can also be understood as strip domains 4401 and sector domains 4402 being positioned in parallel. 402 are alternately distributed on the same annular surface 443 of the magnetic ring 44. Two adjacent strip magnetic domains 4401 are continuously arranged on the inner ring sidewall 441, and two adjacent strip magnetic domains 4401 are spaced apart on the outer ring sidewall 442. Two adjacent fan-shaped magnetic domains 4402 are also spaced apart on the outer ring sidewall 442. On the annular surface 443, the magnetic field lines in each magnetic domain 440 are along the radial direction of the annular surface 443, that is, the magnetic field lines in each magnetic domain 440 are along the radial direction of the annular surface 443. In this embodiment, a 360° surrounding magnetic field can be formed along the central axis of the magnetic ring 44. When forming the magnetic ring 44, the orientation direction of the magnetic ring 44 is along the radial direction of the magnetic ring 445 and points to the central axis 444 of the magnetic ring 44.

[0058] Compared to the first embodiment where the magnetic rings 44 are all divided into fan-shaped magnetic domains 4402, the strip magnetic domains 4401 in this embodiment are arranged more parallelly and can have a more macroscopic magnetism.

[0059] A specific embodiment of the third magnetic ring 44 is provided.

[0060] like Figure 5 , 6As shown in Figure 10, the magnetic ring 44 is the same as in the first embodiment, being spindle-shaped with a thicker middle and thinner edges. The inner ring sidewall 441 of the magnetic ring 44 is the N pole, and the outer ring sidewall 442 is the S pole. The magnetic ring 44 is uniformly divided into multiple magnetic domains 440 along the circumferential direction. Unlike the first embodiment, on the annular surface 443 of the magnetic ring 44, the magnetic domains 440 of the magnetic ring 44 are arranged in an inclined fan-shaped annular pattern. That is, on the annular surface 443, each magnetic domain 440 includes an inner ring sidewall 441 and an outer ring sidewall 442. The line connecting the midpoints of the inner ring sidewall 441 and the outer ring sidewall 442 forms an angle with the radial line 445 of the magnetic ring 44. The endpoints of the inner ring sidewall 441 and the outer ring sidewall 442 are connected along the radial line 445 of the annular surface 443 to form a closed pattern. The multiple inclined fan-shaped annular magnetic domains 440 are arranged in a vortex.

[0061] like Figure 10 As shown, the magnetic field lines in each magnetic domain 440 are set at an angle to the radial direction of the annular surface 443, and the angle range is greater than 0 and less than or equal to 40°. Preferably, the angle is 30°, that is, the angle between the magnetic field lines in each magnetic domain 440 and the radial direction of the annular surface 443 is 30°, so that multiple magnetic domains 440 form a vortex arrangement on the same annular surface 443. In this embodiment, a 360° surrounding magnetic field can also be formed along the central axis 444 of the magnetic ring 44. When forming the magnetic ring 44, the orientation direction of the magnetic ring 44 is along the direction that forms an angle with the radial direction 445 of the magnetic ring 44 and points to the inner ring sidewall 441 of the magnetic ring 44.

[0062] In this embodiment, magnetization is performed along a direction that forms an angle with the radial lines 445 of the magnetic ring 44, thereby increasing the equivalent length of the magnetic ring 44 in the magnetization direction. During the magnetization process of the magnetic ring 44, the formula for calculating the equivalent length of the magnetic ring 44 is a transformation of the cosine function, specifically as follows:

[0063] In the formula for calculating the equivalent length of magnetization, L 原 L represents the length when the magnetic ring 44 is magnetized along the radial direction 445. 等效 θ represents the equivalent length when magnetized along a direction that forms an angle with the radial line 445, and θ represents the angle between the magnetized line and the radial line 445.

[0064] L 等效 =L 原 ÷cosθ

[0065] Taking a 30° angle as an example, according to the above formula for calculating the equivalent length of magnetization, within the same magnetic domain 440, magnetization along a direction at a 30° angle to the radial line 445 of the magnetic ring 44 increases the equivalent length by 1.15 times. Therefore, with the same size magnetic ring 44, a larger magnetic torque can be obtained. Furthermore, the point of application of the magnetic torque is located on the inner ring sidewall 441 of the magnetic ring 44. When the magnetic ring 44 engages with the moving iron core 31, the magnetic torque acts on the outer sidewall of the moving iron core 31. The angled magnetic torque applies a clockwise or counterclockwise component force along its axis to the moving iron core 31, effectively stabilizing it and preventing rotation during driving, thereby improving the stability of the entire contact system 2.

[0066] A specific embodiment of the fourth type of magnetic ring 44 is provided.

[0067] like Figure 5 , 6 As shown in Figure 11, the magnetic ring 44 is the same as in the first embodiment, and is a spindle shape with a thicker middle and thinner edges. The N pole and S pole are distributed on the inner ring sidewall 441 and the outer ring sidewall 442 of the magnetic ring 44. The magnetic ring 44 is uniformly divided into multiple magnetic domains 440 along the circumferential direction. On the surface of the magnetic ring 44, the shape of each magnetic domain 440 is the same as that of the third embodiment.

[0068] Unlike the third embodiment, the surface regions of the same magnetic domain 440 corresponding to the first and second surfaces are misaligned. That is, the shape of the same magnetic domain 440 on the first and second surfaces is a fan-shaped ring, and the two fan-shaped rings are misaligned. The surface shape corresponding to the inner ring sidewall 441 is approximately rectangular, and the surface shape corresponding to the outer ring sidewall 442 is approximately parallelogram. This structure is beneficial for increasing the magnetic moment.

[0069] In this embodiment, on the same annular surface 443, the magnetic field lines in each magnetic domain 440 are set at an angle to the radial lines 445 of the annular surface 443. That is, the magnetic field lines in each magnetic domain 440 are set at an angle to the radial direction of the magnetic ring 44. The angle range is greater than 0 and less than or equal to 40°. The angle between the magnetic field lines in each magnetic domain 440 and the radial lines 445 of the magnetic ring 44 is preferably 30°, so that the multiple magnetic domains 440 located on the same surface form a vortex arrangement, which further increases the magnetic torque.

[0070] In this embodiment, when forming the magnetic ring 44, the orientation direction of the magnetic ring 44 is directed along a direction that forms an angle with the radial line 445 of the magnetic ring 44 and points towards the inner ring sidewall 441 of the magnetic ring 44, and also forms an angle with the central axis 444 of the magnetic ring 44. This can also be understood as magnetizing along a direction that forms an angle with the annular surface 443. The direction of the angle is referenced to the acute angle in a parallelogram. This magnetization along the angled direction increases the equivalent length and equivalent thickness of the magnetic ring 44.

[0071] In this embodiment, the equivalent length and equivalent thickness when magnetized at an angle are both variations of the cosine function, specifically as follows:

[0072] L 等效 =L 原 ÷cosθ

[0073] When calculating the equivalent length of magnetization, L 原 L represents the length when the magnetic ring 44 is magnetized along the radial direction 445. 等效 θ represents the equivalent length when magnetized along a direction that forms an angle with the radial line 445. θ represents the angle between the magnetized area and the radial line 445. Taking an angle of 30° as an example, according to the above calculation formula, within the same magnetic domain 440, when magnetized along a direction that forms an angle of 30° with the radial line 445, the equivalent length is increased by 1.15 times.

[0074] When calculating the equivalent thickness of magnetization, L 原 L represents the thickness when the magnetic ring 44 is magnetized along the annular surface 443 direction. 等效 θ represents the equivalent thickness when magnetized along a direction that forms an angle with the annular surface 443, and θ represents the angle between the magnetized area and the annular surface 443. Taking an angle of 30° as an example, according to the above calculation formula, within the same magnetic domain 440, when magnetized along a direction that forms an angle of 30° with the annular surface 443, the equivalent thickness is also increased by 1.15 times.

[0075] Therefore, it can be seen that with the same size magnetic ring 44, the magnetic ring 44 can obtain a larger magnetic torque. In addition, the point of application of the magnetic torque is located on the inner ring sidewall 441 of the magnetic ring 44. When the magnetic ring 44 is engaged with the moving iron core 31, the component force generated by the magnetic torque can also drive the moving iron core 31.

[0076] In this embodiment, the magnetic ring 44 can form a 360° encircling and slightly inclined magnetic loop, effectively avoiding the problem of excessively high magnetic field density and achieving the optimal magnetic force at the same cost. At the same time, the direction of the magnetic moment in each magnetic domain 440 is set at an angle to the central axis 444 and the radial lines 445 of the magnetic ring 44, which extends the magnetic moment. Based on this, the angled magnetic moment can generate a component force clockwise or counterclockwise along the central axis of the magnetic ring 44. When the magnetic ring 44 is applied to a DC contactor, this component force can stabilize the moving iron core 31, prevent rotation, and help improve the stability of the entire contact system 2.

[0077] A specific embodiment of the fifth magnetic ring 44 is provided.

[0078] like Figure 5 , 6As shown, the magnetic ring 44 is the same as in the first embodiment, and is spindle-shaped with a thick middle and thin edges. The inner ring sidewall 441 and the outer ring sidewall 442 of the magnetic ring are N pole and S pole, respectively. The magnetic ring 44 is uniformly divided into multiple magnetic domains 440 along the circumferential direction. On the surface of the magnetic ring 44, the shape of each magnetic domain 440 is the same as that of the first embodiment.

[0079] Similar to the fourth embodiment, the surface regions of the same magnetic domain 440 corresponding to the first and second surfaces are misaligned. That is, the fan-shaped annular regions of the same magnetic domain 440 corresponding to the first and second surfaces are misaligned. The surface shape corresponding to the inner ring sidewall 441 is approximately rectangular, and the surface shape corresponding to the outer ring sidewall 442 is approximately parallelogram. This structure is beneficial for increasing the magnetic moment. Unlike the fourth embodiment, the direction of the magnetic field lines in each fan-shaped magnetic domain 4402 is the direction of the radial line 445 of the annular surface 443, rather than being set at an angle to the radial line 445 of the annular surface 443.

[0080] Of course, in the above five embodiments, the magnetic ring 44 can also be applied to a ring with uniform thickness.

[0081] Combination Figure 1-4 Specific embodiments of DC contactors are provided.

[0082] like Figure 1 , 2 As shown, the DC contactor includes a hollow cylindrical outer shell 1. An electromagnetic system and a contact system 2 are disposed inside the outer shell 1. The contact system 2 is disposed above the electromagnetic system along the axial direction of the outer shell 1. In this embodiment, the outer shell 1 includes a top cover 102 and a bottom shell 101. An inner shell 5 is also assembled inside the bottom shell 101. The electromagnetic system and the contact system 2 are jointly assembled in the inner shell 5. The top cover 102 is jointly placed on the outer shell 1 and the inner shell 5.

[0083] like Figure 3 , 4As shown, the electromagnetic system includes an armature assembly 3, a coil assembly 4, and a magnetic ring 44 as described in the above embodiment. The armature assembly 3 is located between the coil assembly 4 and the contact system 2. The armature assembly 3 and the contact system 2 adopt existing technology. The armature assembly 3 includes at least a cylindrical moving iron core 31 and a disc-shaped yoke. The yoke is fixed in the inner shell 5 and spaced apart from one end of the moving iron core 31. Alternatively, the inner shell 5 can be used as the yoke. The contact system 2 includes a moving contact assembly and a stationary contact assembly 21 that cooperate with each other. The stationary contact assembly 21 is fixed on the top cover 102. The stationary contact assembly 22 extends with a lead-out end 221. The lead-out end 221 extends axially towards the coil assembly 4 within the outer shell 1. The moving contact assembly is driven by the moving iron core 31 and... The stationary contact assembly 21 contacts or separates; in this embodiment, there are two coil assemblies 4, which are arranged along the axial direction of the outer shell 1. Each coil assembly 4 includes a coil frame and a coil 42 wound on the coil frame. A magnetic ring 44 is disposed between the two coil assemblies 4. The moving iron core 31 slides along the axial direction of the outer shell 1 through the middle of the two coil frames and the magnetic ring 44. The magnetic ring 44 forms a surrounding magnetic circuit around the moving iron core 31, so that the moving iron core 31 is uniformly stressed and will not produce deviation, thus avoiding excessive local magnetic field density. The magnetic ring 44 is an indivisible whole with uniform tolerance dimensions. It does not need to overcome like repulsion during assembly, thus avoiding deviation in assembly position, simplifying the assembly process, and enabling automatic assembly.

[0084] In this embodiment, two coil frames are plugged into one end near the magnetic ring 44 to form a plug-in structure. The plug-in structure corresponds to the central position of one end of each coil frame. For example, one end of one coil frame is provided with a plug-in groove, and one end of the other coil frame protrudes outward to form a plug-in part. The plug-in part is coaxial with the moving iron core 31, so that the moving iron core 31 can slide through the plug-in part. The end of the plug-in part is inserted into the plug-in groove. The magnetic ring 44 is sleeved on the plug-in structure, so that the plug-in structure is located between the inner ring sidewall 441 of the magnetic ring 44 and the outer sidewall of the moving iron core 31. The magnetic ring 44 is separated from the moving iron core 31 by the plug-in structure. When the magnetic ring 44 is made of conductive material, the plug-in structure can play an insulating role.

[0085] Alternatively, the plug-in structure corresponds to the opposite sides of one end of the coil frame. For example, one end of the coil frame has a limiting protrusion on the opposite sides, each limiting protrusion having a groove for plugging in. The other end of the coil frame has a post, which can be plugged into the groove of the limiting protrusion. An installation space for assembling the magnetic ring 44 is formed between the ends of the two coil frames. Preferably, the shape of the installation space matches the spindle-shaped magnetic ring 44. The outer ring sidewall 442 of the magnetic ring 44 has a clearance notch on its edge. The plug-in structure passes through the clearance notch. At this time, the moving iron core 31 can slide in contact with the inner ring sidewall 441 of the magnetic ring 44. The two coil frames are plugged in, so that each coil assembly 4 is formed separately, which simplifies the forming difficulty of the coil frame and the winding process difficulty of the coil 42.

[0086] Of course, the two coil frames can also be a single integrated structure. In this case, a mounting groove for assembling the magnetic ring 44 needs to be provided in the integrated structure. The mounting groove can communicate with the moving iron core 31, allowing the inner ring sidewall 441 of the magnetic ring 44 to slide in contact with the moving iron core 31. Alternatively, the bottom of the mounting groove can be positioned between the inner ring sidewall 441 of the magnetic ring 44 and the moving iron core 31 to achieve insulation. Preferably, the shape of the mounting groove matches the spindle shape of the magnetic ring 44, and the magnetic ring 44 is preferably installed in the coil frame by injection molding.

[0087] Furthermore, the ends of the coil frame are also provided with coil inserts. Preferably, the ends of the coil frame are provided with columns for mounting the coil inserts. The columns have insert slots for inserting the coil inserts. Preferably, the coil inserts and insert slots are provided with mutually cooperating buckles and latches to achieve stable and quick assembly. The coil inserts are connected to the coils 42 on the same coil frame. When the two coil assemblies 4 are arranged along the axial direction of the outer shell 1, the coil inserts of the two coil frames elastically abut against each other. The coil inserts near the stationary contact assembly 21 are used for elastic connection with the stationary contact assembly 21. Preferably, at least one clearance notch is provided on the edge of the magnetic ring 44, and the column with the coil inserts can pass through the clearance notch.

[0088] Combination Figure 12-23 A magnetic ring manufacturing apparatus is provided, comprising a support structure 61 on which a molding component and a magnetic field component are assembled. The molding component includes an annular mold and a pressing component. The magnetic field component generates a directional magnetic field. The annular mold filled with a magnetic powder mixture 660 is located within the directional magnetic field. After the magnetic powder mixture 660 is oriented, the pressing component cooperates with the annular mold to press the magnetic powder mixture 660 into a pre-formed blank. Subsequently, the blank is sintered into a permanent magnetic ring. The magnetic powder mixture 660 can be neodymium iron boron alloy magnetic powder or a mixture with SrO or BaO and Fe2O3 as the main raw materials.

[0089] Specifically, such as Figure 12 , 13 As shown, the support structure 61 typically includes a fixing frame, which provides assembly positions for the molding assembly and the magnetic field assembly. The annular mold typically includes a mold cavity body 6211, the hollow portion of which forms the mold cavity. A die head is disposed at each end of the mold cavity body 6211. The pressing assembly includes at least two hydraulic cylinders, each die head driven by at least one hydraulic cylinder. One die head is used to close one end of the mold cavity body 6211 and to fill it with magnetic powder mixture 660. The other die head, driven by the hydraulic cylinder, can extend into the mold cavity. After the magnetic powder mixture 660 is oriented, the magnetic powder mixture in the mold cavity body 6211 is pressed together by the two hydraulic cylinders and the two die heads to form a pre-molded blank. The formed blank is then sintered to form a permanent magnetic ring, such as... Figure 14 As shown, each die head has an annular groove 6214 on its end face that contacts the magnetic powder mixture 660. The groove depth of the annular groove 6214 gradually increases radially towards the center, thereby enabling the pressing to form a blank that is thick in the middle and thin at the edges. In this embodiment, the two dies are typically divided into an upper die head 6212 and a lower die head 6213, and the two hydraulic cylinders are divided into an upper hydraulic cylinder 6221 and a lower hydraulic cylinder 6222. The upper die head 6212 is driven by the upper hydraulic cylinder 6221, and the lower die head 6213 is driven by the lower hydraulic cylinder 6222.

[0090] like Figure 12 , 13 As shown in Figures 15 and 16, the magnetic field assembly includes a pair of magnetic yokes 631 and a magnetic cylinder 634. A magnetic field generator 632 and a magnetic core 633 are disposed between the pair of magnetic yokes 631. The pressing assembly extends into the mold cavity through at least one of the magnetic yokes 631. At least part of the magnetic core 633 is located inside the mold cavity. The magnetic cylinder 634 is sleeved outside the annular mold. The magnetic cylinder 634 is driven and connected to a motor 65 through a transmission assembly. The magnetic core 633 is driven and connected to the motor 65. The motor 65 is used to drive the magnetic core 633 and the magnetic cylinder 634 to rotate around their respective axes.

[0091] Specifically, at least one magnetic yoke 631 has a clearance groove for the pressing assembly to pass through. The first end 6331 of the magnetic core 633 is located in the mold cavity. The first end 6331 of the magnetic core 633 passes through at least one of the magnetic yokes 632 and extends into the mold cavity along the axial direction of the annular mold. The magnetic guide cylinder 634 is sleeved outside the annular mold. The magnetic field generator 632 is activated, so that the magnetic guide cylinder 634 and the magnetic core 633 form a directional magnetic field between a pair of magnetic yokes 631. The magnetic guide cylinder 634 is driven by a transmission assembly. The transmission assembly and the second end 6332 of the magnetic core 633 are respectively driven by a motor 635. The motor 635 is activated, which drives the magnetic core 633 and the magnetic guide cylinder 634 to rotate around their respective axes, so that the directional magnetic field between the magnetic guide cylinder 634 and the magnetic core 633 rotates.

[0092] Thus, the magnetic core 633 and the magnetic tube 634 form a directional magnetic field between a pair of magnetic yokes 632. The magnetic core 633 and the magnetic tube 634 are driven by the motor 635 to rotate around their respective axes, causing the directional magnetic field between the magnetic core 633 and the magnetic tube 634 to rotate. By changing the direction of the directional magnetic field, the magnetic powder mixture 660 can be oriented in different directions.

[0093] Furthermore, such as Figure 17 and 20 As shown, the magnetic field assembly can also be configured with a magnetic rod 635 and a shielding cover 636. A limiting groove is formed on the circumferential side wall of the magnetic cylinder 634, and the magnetic rod 635 is embedded in the limiting groove. A notch 6361 is formed on the circumferential side wall of the shielding cover 636, and the first end 6331 of the magnetic core 633 is inserted into the notch 6361. By adjusting the relative position of the magnetic rod 635 and the first end 6331 of the magnetic core 633, such as... Figure 15 , 16 The structure shown can form the first embodiment, and / or, by adjusting the shape of the first end 6331 of the magnetic rod 635 and the magnetic core 633, the magnetic powder mixture 660 can be oriented from different directions and angles, thereby forming a magnetic ring 44 that can meet different needs. For example, if the limiting groove and notch groove 6361 are strip grooves, and the first end 6331 of the magnetic rod 635 and the magnetic core 633 are corresponding straight rods, the magnetic ring 44 in the second embodiment and the third embodiment can be formed, or, as... Figure 20-23 As shown, both the limiting groove and the notch 6361 are spiral grooves, and the first end 6331 of the magnetic rod 635 and the magnetic core 633 are corresponding spiral rods, so that the magnetic rod 635 and the first end 6331 of the magnetic core 633 are at least partially spaced and opposite each other, which can form the magnetic ring 44 in the fourth embodiment. Of course, the magnetic rod 635 and the first end 6331 of the magnetic core 633 can also be formed by other combinations. Alternatively, the limiting groove of the magnetic cylinder 634 is a spiral groove, the magnetic rod 635 is a spiral rod, the notch 6361 of the shield 636 is a strip groove, and the first end 6331 of the magnetic core 633 is a straight rod. The magnetic rod 635 and the first end 6331 of the magnetic core 633 are spaced and opposite each other, thereby forming the magnetic ring 44 in the fifth embodiment.

[0094] Furthermore, such as Figure 12 , 15 As shown in Figures 17 and 20, a gear section 6341 is provided on the outer side of the magnetic cylinder 634. The transmission assembly includes at least two transmission gears, one of which is meshed with the output shaft of the motor 635, and the other is meshed with the gear section 6341 of the magnetic cylinder 634. Adjacent transmission gears are connected by a transmission rod. The magnetic cylinder 634 and the transmission assembly are meshed, which helps to ensure the connection stability between the magnetic cylinder 634 and the transmission assembly.

[0095] A method for manufacturing a magnetic ring, wherein the aforementioned magnetic ring 44 manufacturing equipment performs the following steps:

[0096] Step S1: Fill the mold cavity with magnetic powder mixture 660;

[0097] Step S2: Activate the magnetic field generator 632 to form a directional magnetic field between the magnetic core 633 and the magnetic tube 634 and a pair of magnetic yokes 631;

[0098] Step S3: Start the motor 635 to rotate the directional magnetic field between the magnetic core 635 and the magnetic cylinder 634 until the magnetic powder mixture 660 is oriented.

[0099] Step S4: Start the pressing component to press the blank into a pre-formed blank;

[0100] Step S5: The sintered billet is a magnetic ring permanent magnet.

[0101] It should be noted that in the description of this invention, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship conventionally placed during use. They are used only for ease of description and do not indicate that the device or element referred to must have a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating relative importance.

[0102] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A magnetic ring, characterized in that: The thickness of the magnetic ring (44) gradually increases along the direction close to the central axis (444), making the magnetic ring (44) spindle-shaped with a thicker middle and thinner edges. The inner ring sidewall (441) and the outer ring sidewall (442) of the magnetic ring (44) are magnetic poles with opposite magnetic properties. The area between the inner ring sidewall (441) and the outer ring sidewall (442) is the annular surface (443) of the magnetic ring (44). The magnetic ring (44) is divided into multiple magnetic domains (440) along the circumferential direction. On the annular surface (443), the magnetic field lines in each magnetic domain (440) point towards or away from the inner ring sidewall (441).

2. The magnetic ring according to claim 1, characterized in that: The inner ring sidewall (441) is the N pole, and the outer ring sidewall (442) is the S pole.

3. The magnetic ring according to claim 1, characterized in that: The area of ​​the inner ring sidewall (441) is equal to the area of ​​the outer ring sidewall (442).

4. The magnetic ring according to claim 1, characterized in that: On the annular surface (443), the direction of the magnetic field lines in each magnetic domain (440) is the direction of the radial lines (445) of the annular surface (443).

5. The magnetic ring according to claim 1, characterized in that: The magnetic ring (44) is divided into a plurality of uniform magnetic domains (440) along the circumferential direction, and each magnetic domain (440) is fan-shaped on the annular surface (443).

6. The magnetic ring according to claim 1, characterized in that: On the annular surface (443), the magnetic domains (440) are divided into bar magnetic domains (4401) and fan magnetic domains (4402). A plurality of bar magnetic domains (4401) are arranged at equal intervals along the circumferential direction of the annular surface (443), and a fan magnetic domain (4402) is arranged between two adjacent bar magnetic domains (4401).

7. The magnetic ring according to claim 1, characterized in that: On the annular surface (443), the angle between the magnetic field lines in each magnetic domain (440) and the radial lines (445) of the magnetic ring (44) ranges from 0 to 40°.

8. The magnetic ring according to claim 7, characterized in that: The two annular surfaces (443) are divided into a first surface and a second surface. The surface regions of the same magnetic domain (440) corresponding to the first surface and the second surface are misaligned, so that the surface shapes of the same magnetic domain (440) corresponding to the inner ring sidewall (441) and the outer ring sidewall (442) are rectangular and parallelogram, respectively.

9. A DC contactor, comprising a housing (1), wherein an electromagnetic system is disposed within the housing (1), the electromagnetic system comprising an armature assembly (3) and two coil assemblies (4), the two coil assemblies (4) being arranged along the axial direction of the housing (1) for driving the armature assembly (3) to move linearly, characterized in that: The electromagnetic system further includes a magnetic ring (44) as described in any one of claims 1-8, located between the two coil assemblies (4) along the axial direction of the housing (1), wherein the moving iron core (31) of the armature assembly (3) slides at the midpoint between the two coil assemblies (4) and the magnetic ring (44).

10. The DC contactor according to claim 9, characterized in that: Each coil assembly (4) includes a coil frame and a coil (42) wound on the coil frame, the moving iron core (31) sliding in the middle of the two coil frames, and the inner ring sidewall (441) of the magnetic ring (44) slidingly contacting the moving iron core (31).

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