Magnetic ring and direct current contactor

Abstract

A magnetic ring and DC contactor, the inner ring side wall, outer ring side wall of magnetic ring are magnetic pole of opposite magnetic respectively, the annular surface connected between the inner ring side wall and the outer ring side wall are the first surface and the second surface of magnetic ring respectively, magnetic ring is uniformly separated into multiple magnetic domains along the circumferential direction, and the same magnetic domain corresponds to the mutual misregistration of two surface areas of the first surface and the second surface.The utility model discloses a magnetic ring, and the magnetic pole of magnetic ring can form 360 ° around magnetic loop on the inner ring side wall and the outer ring side wall respectively, can effectively avoid the problem that local magnetic field density is too high, makes magnetic force reach the best state under the same cost, when magnetic ring is applied to DC contactor, magnetic ring is assembled as an indivisible whole, avoids the assembling deviation caused by the same repulsion between multiple permanent magnets, simplifies the assembling process, simultaneously, the mutual misregistration of two surface areas of the first surface and the second surface corresponding to the same magnetic domain, is favorable for prolonging magnetic moment.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical appliances, 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 involves setting 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: First, using more than two magnets makes it impossible to form a uniform magnetic field, resulting in uneven force on the moving iron core or armature. First, the uniformity of the magnetic core or armature can cause deviations in its movement, ultimately leading to product failure risks. Second, the use of two or more magnets requires manual labor or tooling to counteract repulsive forces during assembly, making assembly difficult. Third, 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. Fourth, theoretically, the magnetic poles are distributed on the inner and outer ring sidewalls of the magnetic ring, theoretically dividing the magnetic ring into multiple magnetic domains, which is limited by the radial width of the magnetic ring and is not conducive to extending the magnetic torque. 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] This invention provides a magnetic ring, wherein the inner and outer ring sidewalls of the magnetic ring are magnetic poles with opposite magnetic properties, and the annular surfaces connecting the inner and outer ring sidewalls are the first and second surfaces of the magnetic ring, respectively. The magnetic ring is uniformly divided into multiple magnetic domains along the circumferential direction, and the two surface regions of the same magnetic domain corresponding to the first and second surfaces are misaligned.

[0006] Preferably, the surface shape of the same magnetic domain corresponding to the inner ring sidewall is rectangular, and the surface shape of the same magnetic domain corresponding to the outer ring sidewall is parallelogram.

[0007] Preferably, on the annular surface, the magnetic field lines in each magnetic domain are arranged at an angle to the radial lines of the annular surface, so that the multiple magnetic domains located on the same annular surface form a vortex arrangement.

[0008] Preferably, on the annular surface, the angle between the magnetic field lines in each magnetic domain and the radial lines of the annular surface ranges from 0 to 40°.

[0009] Preferably, on the annular surface of the magnetic ring, the angle between the magnetic field lines in each magnetic domain and the radial lines of the annular surface is 30°.

[0010] Preferably, the edge of the magnetic ring is provided with a clearance notch.

[0011] Preferably, the inner ring sidewall is an N pole and the outer ring sidewall is an S pole.

[0012] This utility model also provides a DC contactor, including a housing, an electromagnetic system disposed inside 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 to drive the armature assembly to move linearly, the electromagnetic system also including a magnetic ring as described above, the magnetic ring being located between the two coil assemblies along the axial direction of the housing, the moving iron core of the armature assembly sliding in the middle of the two coil assemblies and the magnetic ring.

[0013] Furthermore, each of the coil assemblies includes a coil frame and a coil wound on the coil frame, with two coil frames arranged axially along the housing, and the moving iron core sliding at the middle of the two coil frames.

[0014] Furthermore, the two coil frames are an integral structure, and a mounting groove for assembling the magnetic ring is reserved in the middle of the integral structure.

[0015] Furthermore, 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 and is located between the inner ring sidewall of the magnetic ring and the outer sidewall of the moving iron core.

[0016] Furthermore, the inner ring sidewall of the magnetic ring is in sliding engagement with the moving iron core.

[0017] Furthermore, each of the coil assemblies is also provided with a coil insert, and when two of the coil assemblies are inserted axially, the coil inserts of the two coil frames elastically abut against each other.

[0018] The magnetic ring and DC contactor of this invention have magnetic poles that can form a 360° surrounding magnetic loop on the inner and outer ring sidewalls, respectively. This effectively avoids the problem of excessively high local magnetic field density and achieves the optimal magnetic force at the same cost. When the magnetic ring is applied to the DC contactor, it is assembled as an indivisible whole, avoiding assembly deviations caused by the repulsive forces between multiple permanent magnets and simplifying the assembly process. At the same time, the two surface regions of the same magnetic domain corresponding to the first and second surfaces are misaligned, which helps to extend the magnetic torque.

[0019] In addition, the magnetic field lines in the magnetic domains are set at an angle to the radial lines of the annular surface, which further extends 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 help improve the stability of the entire contact system.

[0020] Furthermore, the assembly methods of the magnetic ring and coil frame are diverse, which can meet different needs. Among them, the magnetic ring slides in contact with the moving iron core, and the magnetic gap is small, which helps to increase the total magnetic flux and strengthen the magnetic force of the electromagnetic system. The two coil frames are integrated into one structure, so that the two coil components and the magnet form a whole, which is convenient for assembly. The coil frames adopt a plug-in fit, and each coil component is formed separately, which simplifies the forming difficulty of the coil frame and the winding process of the coil. The magnetic ring is separated from the moving iron core through the plug-in structure, which can play an insulating role. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the DC contactor in this utility model. Figure 1 ;

[0022] Figure 2 This is a schematic diagram of the structure of the DC contactor in this utility model. Figure 2 ;

[0023] Figure 3 This is the cross-section of the DC contactor in this utility model. Figure 1 ;

[0024] Figure 4 This is the cross-section of the DC contactor in this utility model. Figure 2 ;

[0025] Figure 5 This is a schematic diagram of the magnetic ring structure in this utility model;

[0026] Figure 6 This is a schematic diagram of the magnetic ring structure in the first embodiment of this utility model;

[0027] Figure 7 This is a front view of the magnetic ring in the first embodiment of this utility model;

[0028] Figure 8 This is a side view of the magnetic ring in the second embodiment of this utility model;

[0029] Figure 9 This is a front view of the magnetic ring in the second embodiment of this utility model;

[0030] Figure 10 This is a schematic diagram of the magnetic ring manufacturing equipment in this utility model;

[0031] Figure 11 This is a cross-sectional view of the magnetic ring manufacturing equipment in this utility model;

[0032] Figure 12 This is a schematic diagram showing the combination of the magnetic cylinder, magnetic core, shielding cover, and magnetic rod in this utility model;

[0033] Figure 13 yes Figure 12 Schematic diagram of the structure of the middle magnetic core;

[0034] Figure 14 yes Figure 12 Schematic diagram of the structure of the shielding cover;

[0035] Figure 15 yes Figure 12 Schematic diagram of the structure of the intermediate-conducting magnetic rod;

[0036] Figure label:

[0037] 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 Support structure, 6211-mold cavity body, 6212-upper mold head, 6213-lower mold head, 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 section, 635-magnetic guide rod, 636-shielding cover, 6361-notch, 65-motor, 660-magnetic powder mixture. Detailed Implementation

[0038] The specific embodiments of the magnetic ring and DC contactor of this utility model are further described below with reference to the accompanying drawings. The magnetic ring and DC contactor of this utility model are not limited to the descriptions in the following embodiments.

[0039] like Figure 1-4As 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 slides up and down in the middle of the coil frame along the axial direction of the housing 1. 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 in a straight line. Typically, the electromagnetic system also includes multiple permanent magnets symmetrically distributed along the circumference of the moving iron core 31, used to cooperate with the coil assembly 4 to drive the moving iron core 31; the contact system 2 adopts existing technology, and the contact system 2 includes a moving contact assembly and a stationary contact assembly 21 that cooperate with each other, wherein the stationary contact assembly 21 is fixed at one end of the outer shell 1 away from the electromagnetic system, and the moving contact assembly is connected to the armature assembly 3, and the moving contact assembly is driven by the moving iron core 31 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.

[0040] The improvement of this application lies in providing a magnetic ring 44 that can replace multiple permanent magnets, such as... Figure 5-7 As shown, the inner ring sidewall 441 and the outer ring sidewall 442 of the magnetic ring 44 are magnetic poles with opposite magnetic properties. The annular surface 443 connecting the inner ring sidewall 441 and the outer ring sidewall 442 are the first surface and the second surface of the magnetic ring 44, respectively. The magnetic ring 44 is uniformly divided into multiple magnetic domains 440 along the circumferential direction, and the same magnetic domain 440 corresponds to two surface regions of the first surface and the second surface that are misaligned with each other.

[0041] 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 effectively avoid the problem of excessive local magnetic field density and achieve the best magnetic force at the same cost. When the magnetic ring 44 is applied in a DC contactor, 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. At the same time, the two surfaces of the same magnetic domain 440 corresponding to the first surface and the second surface are misaligned, which is beneficial to extending the magnetic torque.

[0042] Specifically, the magnetic ring 44 is a circular ring. 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 surface shape of the same magnetic domain 440 corresponding to the inner ring sidewall 441 is approximately rectangular, and the surface shape of the same magnetic domain 440 corresponding to the outer ring sidewall 442 is approximately parallelogram. This ensures that when the magnetic ring 44 is formed, its magnetization direction is at an angle to the central axis 444 of the magnetic ring 44. The magnetic ring 44 forms a 360° radial magnetic circuit around the central axis of the magnetic ring 44 and is slightly inclined. This ensures that a uniform magnetic force is applied to the moving iron core 31 and prevents the moving iron core 31 from shifting during movement.

[0043] Of course, on the surface of the magnetic ring 44, the magnetic field lines in the magnetic domains 440 can also form an angle with the radial lines 445 of the annular surface 443. (See [reference needed] for the direction of the magnetic field lines.) Figure 6 , 7 Preferably, the angle between the magnetic field lines and the radial lines 445 of the annular surface 443 is between 0° and 40°, with the direction of the radial lines 445 being the radial direction of the annular surface 443. This helps to extend the magnetic torque. At the same time, the angled magnetic force can generate a component force along the central axis of the magnetic ring 44, either clockwise or counterclockwise. When the magnetic ring 44 is engaged with the moving iron core 31, this component force can stabilize the moving iron core 31, preventing rotation and improving the stability of the entire contact system 2.

[0044] Combination Figure 5-7 A specific embodiment of the first magnetic ring 44 is provided, wherein the magnetic lines of force of the magnetic ring 44 are set at angles to the radial lines of the magnetic ring 44 and the central axis of the magnetic ring 44.

[0045] like Figure 5-7 As shown, the magnetic ring 44 is a circular ring with a certain thickness. 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. The annular surface 443 connecting the inner ring sidewall 441 and the outer ring sidewall 442 are the first surface and the second surface of the magnetic ring 44, respectively. The magnetic ring 44 is uniformly divided into multiple magnetic domains 440 along the circumferential direction. The two surface regions of the same magnetic domain 440 corresponding to the first surface and the second surface are staggered. In this embodiment, each magnetic domain 440 is fan-shaped. That is, in the same magnetic domain 440, the surface shape corresponding to the first surface and the second surface is fan-shaped. The two fan-shaped rings are staggered. 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.

[0046] In this embodiment, on the same annular surface 443, the magnetic field lines in each magnetic domain 440 are arranged 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 at an angle to the radial direction of the magnetic ring 44, and 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 annular surface 443 form a vortex arrangement, further increasing the magnetic torque. The magnetic domain 440 is an inclined fan-shaped ring on the same 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 shape. The multiple inclined fan-shaped ring magnetic domains 440 are arranged in a vortex.

[0047] In this embodiment, outside the magnetic ring 44, the magnetic field lines point from the N pole to the S pole, and inside the magnetic ring 44, the magnetic field lines point from the S pole to the N pole. When forming the magnetic ring 44, the orientation direction of the magnetic ring 44 is 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 of the magnetic ring 44 in the magnetization direction.

[0048] In this embodiment, the equivalent length and equivalent thickness when magnetized at an angle are both variations of the cosine function, specifically as follows:

[0049]

[0050] When calculating the equivalent length of magnetization This indicates the length when the magnetic ring 44 is magnetized along the radial direction 445. This indicates the equivalent length when magnetized along a direction at an angle to the radial line 445. This indicates the angle between the magnetizer 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, magnetizing along a direction with an angle of 30° to the radial line 445 increases its equivalent length by 1.15 times.

[0051] When calculating the equivalent thickness of magnetization This indicates the thickness when the magnetic ring 44 is magnetized along the annular surface 443 direction. This indicates the equivalent thickness when magnetized along a direction at an angle to the annular surface 443. This indicates 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 with an angle of 30° to the annular surface 443, its equivalent thickness is also increased by 1.15 times.

[0052] Therefore, it can be seen that, under the same size magnetic ring 44, magnetization in an angled direction allows the magnetic ring 44 to 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.

[0053] In this embodiment, the magnetic ring 44 can form a 360° encircling and slightly inclined magnetic circuit, which can effectively avoid the problem of excessive magnetic field density and achieve the best 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 line 445 of the magnetic ring 44, which prolongs the magnetic moment. On this basis, the angled magnetic moment can generate a component force clockwise or counterclockwise along the central axis 444 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 and prevent rotation, which helps to improve the stability of the entire contact system 2.

[0054] like Figure 5 , 8 9 provides a specific embodiment of the second magnetic ring 44.

[0055] The magnetic ring 44 is a circular ring with a certain thickness, the thickness direction being the axial direction of the magnetic ring 44. 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. The annular surface 443 connecting the inner ring sidewall 441 and the outer ring sidewall 442 are the first surface and the second surface of the magnetic ring 44, respectively. The magnetic ring 44 is uniformly divided into multiple magnetic domains 440 along the circumferential direction. Each magnetic domain 440 is fan-shaped on the annular surface 443, that is, 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 ring. The radial lines 445 of the shaped surface 443 are connected to form a closed pattern, which is a fan-shaped ring. The magnetic field lines in the magnetic domains 440 of the fan-shaped ring are in the direction of the radial lines 445 of the ring surface 443. The fan-shaped rings of the same magnetic domain 440 on the first and second surfaces are staggered, so that the surface shape of the inner ring sidewall 441 of each magnetic domain 440 is approximately rectangular, and the surface shape of the outer ring sidewall 442 is approximately parallelogram. With this structure, the magnetic ring 44 can form a 360° surrounding magnetic circuit. However, compared with the first embodiment, this embodiment only increases the equivalent thickness during the magnetization process, so that the range of increase in magnetic torque of the magnetic ring 44 is relatively small.

[0056] Combination Figure 1-4 Specific embodiments of DC contactors are provided.

[0057] The DC contactor includes a hollow cylindrical housing 1. An electromagnetic system and a contact system 2 are disposed inside the housing 1. The contact system 2 is disposed above the electromagnetic system along the axial direction of the housing 1. In this embodiment, the housing 1 includes a top cover 102 and a bottom cover 101. An inner cover 5 is also assembled inside the bottom cover 101. The electromagnetic system and the contact system 2 are jointly assembled in the inner cover 5. The top cover 102 is jointly covered on the housing 1 and the inner cover 5.

[0058] like Figure 3 , 4 As 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. The yoke can also be formed by the bottom plate of the inner shell 5. 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 inside the outer shell 1. The moving contact assembly is driven by the moving iron core 31. Contact or separation with stationary contact assembly 21; 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 arranged between the two coil assemblies 4. The moving iron core 31 interacts up and down along the axial direction of the outer shell 1 in 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, 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, avoiding deviation in assembly position, simplifying the assembly process, and enabling automatic assembly.

[0059] 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.

[0060] Alternatively, the plug-in structure corresponds to the opposite sides of one end of the coil frame near the magnetic ring 44. 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. One end of the other 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. 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 difficulty of the coil 42.

[0061] Of course, the two coil frames can also be an integral structure. In this case, an mounting groove for assembling the magnetic ring 44 needs to be provided in the integral structure. The mounting groove can be connected to the moving iron core 31 so that the inner ring sidewall 441 of the magnetic ring 44 slides in contact with the moving iron core 31. Alternatively, the bottom of the mounting groove is blocked between the inner ring sidewall 441 of the magnetic ring 44 and the moving iron core 31 to achieve insulation. Preferably, the magnetic ring 44 is set in the coil frame by injection molding.

[0062] 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 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.

[0063] Combination Figure 10-14A 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.

[0064] Specifically, such as Figure 10 , 11 As shown, the support structure 61 typically includes a fixing frame, which provides an assembly position for the molding assembly and the magnetic field assembly. The annular mold typically includes a mold cavity body 6211, the hollow part of which is the mold cavity. A die head is respectively arranged at both ends of the mold cavity body 6211. The pressing assembly includes at least two hydraulic cylinders, each die head being 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 the magnetic powder mixture 660. The other die head can extend into the mold cavity under the drive of the hydraulic cylinder. After the magnetic powder mixture 660 is oriented, the magnetic powder mixture in the mold cavity body 6211 is pressed by the two hydraulic cylinders and the two die heads to form a pre-formed blank. After sintering, the formed blank forms a magnetic ring permanent magnet. The end face of each die head that contacts the magnetic powder mixture 660 is a plane, thereby forming a magnetic ring 44 with uniform thickness. In this embodiment, the two mold heads are typically divided into an upper mold head 6212 and a lower mold head 6213, and the two hydraulic cylinders are divided into an upper hydraulic cylinder 6221 and a lower hydraulic cylinder 6222. The upper mold head 6212 is driven by the upper hydraulic cylinder 6221, and the lower mold head 6213 is driven by the lower hydraulic cylinder 6222.

[0065] like Figure 10 , 11 As shown, 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.

[0066] 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.

[0067] 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.

[0068] Furthermore, 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. Both the limiting groove and the notch 6361 are helical grooves, and the first end 6331 of the magnetic rod 635 and the magnetic core 633 are corresponding helical rods, so that the magnetic rod 635 and the first end 6331 of the magnetic core 633 are aligned. At least some areas are spaced apart and opposite each other, which can form the magnetic ring 44 in the first embodiment. Of course, the magnetic rod 635 and the first end 6331 of the magnetic core 633 can also be other combinations. For example, 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, the first end 6331 of the magnetic core 633 is a straight rod, and the magnetic rod 635 and the first end 6331 of the magnetic core 633 are spaced apart and opposite each other, thereby forming the magnetic ring 44 in the second embodiment.

[0069] Furthermore, such as Figure 10 and 12 As shown, the outer side of the magnetic cylinder 634 is provided with a gear part 6341. The transmission assembly includes at least two transmission gears. One transmission gear is meshed with the output shaft of the motor 635, and the other transmission gear is meshed with the gear part 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.

[0070] A method for manufacturing a magnetic ring, wherein the aforementioned magnetic ring 44 manufacturing equipment performs the following steps:

[0071] Step S1: Fill the mold cavity with magnetic powder mixture 660;

[0072] 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;

[0073] 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.

[0074] Step S4: Start the pressing component to press the blank into a pre-formed blank;

[0075] Step S5: The sintered billet is a magnetic ring permanent magnet.

[0076] It should be noted that in the description of this utility model, 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 commonly used during use. They are only for ease of description and do not indicate that the device or component referred to must have a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating relative importance.

[0077] 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 protection scope of the present invention.

Claims

1. A magnetic ring, characterized in that: The inner ring sidewall (441) and outer ring sidewall (442) of the magnetic ring (44) are magnetic poles with opposite magnetic properties. The annular surface (443) connecting the inner ring sidewall (441) and the outer ring sidewall (442) are the first surface and the second surface of the magnetic ring (44), respectively. The magnetic ring (44) is uniformly divided into multiple magnetic domains (440) along the circumferential direction, and the same magnetic domain (440) corresponds to two surface regions of the first surface and the second surface that are misaligned with each other.

2. The magnetic ring according to claim 1, characterized in that: The surface shape of the same magnetic domain (440) corresponding to the inner ring sidewall (441) is rectangular, and the surface shape of the same magnetic domain (440) corresponding to the outer ring sidewall (442) is parallelogram.

3. The magnetic ring according to claim 1, characterized in that: On the annular surface (443), the magnetic field lines in each of the magnetic domains (440) are set at an angle to the radial lines (445) of the annular surface (443), so that the multiple magnetic domains (440) located on the same annular surface (443) form a vortex arrangement.

4. The magnetic ring (44) according to claim 3, 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 annular surface (443) ranges from 0 to 40°.

5. The magnetic ring according to claim 3 or 4, characterized in that: On the annular surface (443) of the magnetic ring (44), the angle between the magnetic field lines in each magnetic domain (440) and the radial lines (445) of the annular surface (443) is 30°.

6. The magnetic ring according to claim 1, characterized in that: The edge of the magnetic ring (44) is provided with a clearance notch.

7. 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.

8. 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 axially along 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 1-7, 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).

9. The DC contactor according to claim 8, characterized in that: Each of the coil assemblies (4) includes a coil frame and a coil (42) wound on the coil frame. The two coil frames are arranged along the axial direction of the housing (1), and the moving iron core (31) slides in the middle of the two coil frames.

10. The DC contactor according to claim 9, characterized in that: The two coil frames are an integral structure, and a mounting groove for assembling the magnetic ring (44) is reserved in the middle of the integral structure.

11. The DC contactor according to claim 9, characterized in that: The two coil frames are connected at one end near the magnetic ring (44) to form a connection structure. The connection structure is located at the center of one end of the coil frame and is located between the inner ring sidewall (441) of the magnetic ring (44) and the outer sidewall of the moving iron core (31).

12. The DC contactor according to claim 8 or 10, characterized in that: The inner ring sidewall (441) of the magnetic ring (44) is in sliding fit with the moving iron core (31).

13. The DC contactor according to claim 9, characterized in that: Each of the coil assemblies (4) is further provided with a coil insert, and when the two coil assemblies (4) are inserted axially, the coil inserts of the two coil frames abut against each other elastically.

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