Magnetic ring and direct current contactor

Abstract

A magnetic ring and a DC contactor are disclosed. The inner and outer sidewalls of the magnetic ring are magnetic poles with opposite magnetic properties. The magnetic ring is divided into multiple magnetic domains along its circumference. On the annular surface of the magnetic ring, the magnetic field lines in each domain point towards or away from the inner sidewall. In this invention, when the magnetic ring with clearly defined magnetic poles is applied to a DC contactor, the magnetic ring can form a 360° surrounding magnetic circuit, effectively avoiding the problem of excessively high local magnetic field density. This achieves optimal magnetic force at the same cost. Furthermore, the magnetic ring is assembled as an indivisible unit, avoiding assembly deviations caused by the repulsive forces between multiple permanent magnets, thus simplifying the assembly process.

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, have been 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: 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, causing deviations in the movement of the moving iron core or armature, ultimately leading to product failure risks. Second, using more than two magnets requires manual 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. 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 magnetic ring is divided into multiple magnetic domains along the circumferential direction. On the annular surface of the magnetic ring, the magnetic field lines in each magnetic domain point towards or away from the inner ring sidewall.

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

[0007] Preferably, on the annular surface, the magnetic field lines in each of the magnetic domains are radial lines of the annular surface.

[0008] Preferably, the magnetic ring is uniformly divided into multiple identical magnetic domains along the circumferential direction, and each magnetic domain is fan-shaped on the ring surface.

[0009] Preferably, the magnetic ring is divided into strip magnetic domains and sector magnetic domains along the circumferential direction. On the same annular surface, the strip magnetic domains and sector magnetic domains are alternately distributed, and a plurality of strip magnetic domains are arranged at equal intervals along the circumferential direction.

[0010] Preferably, two adjacent bar magnetic domains are arranged continuously on the inner ring sidewall, and two adjacent bar magnetic domains are arranged at intervals on the outer ring sidewall.

[0011] Preferably, on the annular surface, the magnetic field lines in each magnetic domain are arranged at an angle to the radial direction of the annular surface, so that multiple magnetic domains form a vortex arrangement on the same annular surface.

[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, the moving iron core sliding in the middle of the two coil frames, and the inner ring sidewall of the magnetic ring slidingly contacting the outer ring sidewall of the moving iron core.

[0014] Furthermore, the two coil frames are an integral structure, and the central part of the integral structure is provided with a mounting groove for assembling the magnetic ring.

[0015] Furthermore, the two coil frames are inserted into each other near the magnetic ring to form an insertion structure. The insertion structure corresponds to the central position of one end of the coil assembly and is located between the inner ring sidewall of the magnetic ring and the outer sidewall of the moving iron core.

[0016] The magnetic ring and DC contactor of this invention, when the magnetic ring with clearly defined magnetic poles is applied in the DC contactor, the magnetic ring can form a 360° surrounding magnetic circuit, which can effectively avoid the problem of excessive local magnetic field density, and achieve the best magnetic force at the same cost. At the same time, the magnetic ring is assembled as an indivisible whole, avoiding assembly deviation caused by the like-pole repulsion between multiple permanent magnets, and simplifying the assembly process.

[0017] Furthermore, based on the formation of a surrounding magnetic circuit, the uniformly distributed magnetic domains on the magnetic ring can ensure the generation of a uniform magnetic force, thereby ensuring that a uniform magnetic force is applied to the moving iron core and preventing the moving iron core from deviating during movement.

[0018] In addition, magnetic domains are divided into bar domains and sector domains. The bar domains and sector domains are evenly distributed. Based on the formation of a surrounding magnetic ring, the evenly distributed magnetic domains ensure the generation of uniform magnetic force, thereby ensuring that a uniform magnetic force is applied to the moving iron core and preventing the moving iron core from deviating during movement.

[0019] In addition, the magnetic field lines in the magnetic domains are set at an angle to the radial lines on the ring surface, 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.

[0020] In addition, the magnetic ring is 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.

[0021] In addition, the two coil frames are an integral structure, and the magnetic ring is set in the mounting groove of the coil frame. In particular, the coil frame and the magnetic ring are formed into an integral structure by injection molding, so that the two coil components and the magnet form a whole, which facilitates assembly.

[0022] In addition, the coil frame adopts a plug-in connection, 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

[0023] Figure 1 This is a schematic diagram of the structure of the DC contactor in this utility model. Figure 1 ;

[0024] Figure 2 This is a schematic diagram of the structure of the DC contactor in this utility model. Figure 2 ;

[0025] Figure 3 This is the cross-section of the DC contactor in this utility model. Figure 1 ;

[0026] Figure 4 This is the cross-section of the DC contactor in this utility model. Figure 2 ;

[0027] Figure 5 This is a schematic diagram of the magnetic ring structure in this utility model;

[0028] Figure 6 This is a schematic diagram of the magnetic ring structure in the first embodiment of this utility model;

[0029] Figure 7 This is a front view of the magnetic ring in the first embodiment of this utility model;

[0030] Figure 8 This is a schematic diagram of the magnetic field distribution in the first embodiment of this utility model;

[0031] Figure 9 This is a schematic diagram of the magnetic ring structure in the second embodiment of this utility model;

[0032] Figure 10 This is a front view of the magnetic ring in the second embodiment of this utility model;

[0033] Figure 11 This is a schematic diagram of the magnetic ring structure in the third embodiment of this utility model;

[0034] Figure 12 This is a front view of the magnetic ring in the third embodiment of this utility model;

[0035] Figure 13 This is a schematic diagram of the magnetic field distribution in the third embodiment of this utility model;

[0036] Figure 14 This is a schematic diagram of the magnetic ring manufacturing equipment in this utility model;

[0037] Figure 15 This is a cross-sectional view of the magnetic ring manufacturing equipment in this utility model;

[0038] Figure 16 This is a schematic diagram of the structure of the magnetic cylinder in this utility model;

[0039] Figure 17 This is a schematic diagram of the magnetic core structure in this utility model;

[0040] Figure 18 This is a schematic diagram showing the combination of the magnetic cylinder, magnetic core, shielding cover, and magnetic rod in this utility model;

[0041] Figure 19 yes Figure 18 Schematic diagram of the structure of the middle magnetic core;

[0042] Figure 20 yes Figure 18 Schematic diagram of the structure of the shielding cover;

[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 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

[0045] 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.

[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 is slidably mounted 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 axially along the housing 1. The line moves. Typically, the electromagnetic system also includes multiple permanent magnets. These permanent magnets are symmetrically distributed along the circumference of the moving iron core 31 and are used to work 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] Furthermore, 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 assembled together in the inner shell 5. The top cover 102 covers the outer shell 1 and the inner shell 5.

[0048] The improvement of this application lies in providing a magnetic ring 44 that can replace multiple permanent magnets, such as... Figure 5 As shown, the inner ring sidewall 441 and outer ring sidewall 442 of the magnetic ring 44 are magnetic poles with opposite magnetic properties. The magnetic ring 44 is divided into multiple magnetic domains 440 along the circumferential direction. On the annular surface 443 of the magnetic ring 44, 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 6 , 7 The direction of the arrows in 10, 12 and 13.

[0049] Thus, when the magnetic ring 44 with clearly defined magnetic poles is applied in a DC contactor, the magnetic ring 44 can form a 360° surrounding magnetic circuit, which can effectively avoid the problem of excessive local magnetic field density and achieve the best magnetic force at the same cost. At the same time, 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.

[0050] Specifically, such as Figure 5-7 As shown in Figure 10, the magnetic ring 44 is annular. 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 area connecting the inner ring sidewall 441 and the outer ring sidewall 442 is the annular surface 443 of the magnetic ring 44. There are two annular surfaces 443. On the same annular surface 43, the magnetic field lines in each magnetic domain 440 point towards or away from the inner ring sidewall 441. Preferably, on the annular surface 443, the magnetic field lines in each magnetic domain 440 can be along the radial direction 445 of the annular surface 443. That is, the magnetic field lines in each magnetic domain 440 point towards the inner ring sidewall 441 along the radial direction of the annular surface 443. This makes the magnetic ring 44 form a 360° radially surrounding magnetic loop along the central axis of the magnetic ring 44, which can ensure that a uniform magnetic force is applied to the moving iron core 31 and prevent the moving iron core 31 from deviating during movement.

[0051] Of course, such as Figure 11 and 12 As shown, on the annular surface 443, the magnetic field lines in the magnetic domain 440 can also form an angle with the radial lines 445 of the annular surface 443. Preferably, the angle between the magnetic field lines in the magnetic domain 440 and the radial lines 445 of the annular surface 443 is in the range of 0 to 40°. In this way, the magnetic field lines in the magnetic domain 440 form an angle with the radial lines 445 of the magnetic ring 44, which is beneficial to extend the magnetic torque. At the same time, the angled magnetic torque can generate a component force clockwise or counterclockwise along the central axis of the magnetic ring 44. This component force can stabilize the moving iron core 31, prevent rotation, and improve the stability of the entire contact system 2.

[0052] Combination Figure 5-8 A specific embodiment of the first magnetic ring 44 is provided, wherein the magnetic domains 440 of the magnetic ring 44 are fan-shaped, that is, the fan-shaped magnetic domains 440 are composed of an inner arc, an outer arc, and two radii connecting the inner arc and the outer arc of the magnetic ring 44.

[0053] like Figure 5-8As shown, 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 area connecting 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 uniform magnetic domains 440 along the circumferential direction. Each magnetic domain 440 is fan-shaped on the annular surface 443, 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 inner ring sidewall 441 and the outer ring sidewall 442 are connected by a single central angle. The endpoints of 442 are connected along the radial lines 445 of the annular surface 443 to form a closed pattern. This pattern is a fan-shaped annulus. Each magnetic domain 440 corresponds to an approximately rectangular pattern on the inner ring sidewall 441 and the outer ring sidewall 442. On the annular surface 443, the magnetic field lines in each fan-shaped magnetic domain 4402 are in the direction of the radial lines 445 of the annular surface 443. The direction of the radial lines 445 is the radial direction of the annular surface 443. In this embodiment, a 360° 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 lines 445 of the magnetic ring 44, pointing towards the central axis 444 of the magnetic ring 44.

[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 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.

[0055] Combination Figure 5 , 9 10 provides a specific embodiment of the second type of magnetic ring 44, wherein the magnetic domains 440 of the magnetic ring 44 are divided into two types: bar magnetic domains 4401 and fan-shaped magnetic domains 4402, and the bar magnetic domains 4401 and fan-shaped magnetic domains 4402 are alternately distributed.

[0056] like Figure 9 , 10As shown, 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 magnetic ring 44 is divided into multiple magnetic domains 440 along the circumferential direction. In this embodiment, the magnetic domains 440 are divided into strip magnetic domains 4401 and fan-shaped magnetic domains 4402. That is, the pattern of the strip magnetic domain 4401 on the annular surface 443 is approximately rectangular, and the patterns of the strip magnetic domain 4401 on the inner ring sidewall 441 and the outer ring sidewall 442 are both rectangular. The pattern of the fan-shaped magnetic domain 4402 on the annular surface 443 is fan-shaped, and the pattern on the outer ring sidewall 442 is rectangular. On the same annular surface 443, multiple strip magnetic domains 4401 are equally spaced along the circumferential direction of the magnetic ring 44, and a spacer is provided between two adjacent strip magnetic domains 4401. A sector magnetic domain 4402 can also be understood as strip magnetic domains 4401 and sector magnetic domains 4402 being alternately distributed on the same annular surface 443. 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 sector 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° circumferential 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.

[0057] Compared to the first embodiment where the magnetic rings 44 are all divided into fan-shaped magnetic domains 440, the strip magnetic domains 4401 in this embodiment are arranged more parallelly and can have a more macroscopic magnetism.

[0058] Combination Figure 5 , 11 -13 provides a specific embodiment of a third type of magnetic ring 44, wherein the magnetic domains 440 of the magnetic ring 44 are in the form of inclined fan rings, and the plurality of inclined fan ring magnetic domains 440 are arranged in a vortex.

[0059] like Figure 5 , 11As shown in Figure -13, the magnetic ring 44 is a circular ring with a certain thickness. The magnetic ring 44 has the same inner ring sidewall 441, outer ring sidewall 442, and two annular surfaces 443 as in the above embodiment. 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 magnetic ring 44 is uniformly divided into multiple magnetic domains 440 along the circumferential direction. On the annular surface 443, the shape of each magnetic domain 440 is also a fan-shaped ring. However, unlike the first embodiment, each magnetic domain 440 is an inclined fan-shaped ring. That is, on the annular surface 443, each magnetic domain 440 includes a section of inner ring sidewall 441 and a section of outer ring sidewall 442. The line connecting the midpoint of the inner ring sidewall 441 and the midpoint of the outer ring sidewall 442 forms an angle with the radial line 445 of the magnetic ring 44. The endpoints of the outer ring sidewall 442 are connected along the radial lines 445 of the annular surface 443 to form a closed pattern. Multiple inclined fan-shaped annular magnetic domains 440 are arranged in a vortex. The magnetic field lines in each magnetic domain 440 are set at an angle to the radial line 445 of the annular surface 443. 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 line 445 of the magnetic ring 44 and points to the inner ring sidewall 441 of the magnetic ring 44.

[0060] 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:

[0061]

[0062] In the formula for 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 magnetized area and the radial line at 445°.

[0063] Taking an angle of 30° as an example, according to the above formula for calculating the equivalent length of magnetization, within the same magnetic domain 440, when magnetized along a direction with an angle of 30° to the radial line 445 of the magnetic ring 44, its equivalent length is increased by 1.15 times. Thus, it can be seen that with the same size magnetic ring 44, the magnetic ring 44 can obtain a larger magnetic torque.

[0064] 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 magnetic torque acts on the outer sidewall of the moving iron core 31. The magnetic torque at an angle applies a clockwise or counterclockwise component force along its axis to the moving iron core 31, which can effectively stabilize the moving iron core and prevent the moving iron core 31 from rotating during the driving process, thereby improving the stability of the entire contact system 2.

[0065] Combination Figure 1-4 Specific embodiments of DC contactors are provided.

[0066] 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.

[0067] 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. Of course, the inner shell can also 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 inside 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 around the outside of 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, 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.

[0068] In this embodiment, two coil frames are inserted into each other near the magnetic ring 44 to form an insertion structure. The insertion structure corresponds to the central position of the end of each coil frame. For example, one end of one coil frame is provided with an insertion groove, and one end of the other coil frame protrudes outward to form an insertion part. The insertion part is coaxial with the moving iron core 31, so that the moving iron core 31 can slide through the insertion part. The end of the insertion part is inserted into the insertion groove. The magnetic ring 44 is sleeved on the insertion structure, so that the insertion 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 insertion structure. When the magnetic ring 44 is made of conductive material, the insertion structure can play an insulating role.

[0069] 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 coil frame has a post at one end, 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 process difficulty of the coil 42.

[0070] 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.

[0071] Furthermore, one end of the coil frame is provided with a coil insert. Preferably, one end of the coil frame is provided with a column for assembling the coil insert. The column has an insert slot for inserting the coil insert. Preferably, the coil insert and the insert slot are provided with mutually cooperating buckles and latches to achieve stable and quick assembly. The coil insert is connected to the coil 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 insert near the stationary contact assembly 21 is 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, through which the coil insert can pass.

[0072] Combination Figure 14-20A magnetic ring manufacturing apparatus is provided, comprising a support structure 61, on which a forming component and a magnetic field component are assembled. The forming component includes an annular mold and a pressing component. The magnetic field component is used to generate 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 it can be a mixture with SrO or BaO and Fe2O3 as the main raw materials.

[0073] Specifically, such as Figure 14 , 15 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.

[0074] like Figure 14-17 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.

[0075] Specifically, such as Figure 15As shown, 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.

[0076] 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.

[0077] Furthermore, such as Figure 18-20 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 the 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.

[0078] Furthermore, such as Figure 14 , 16 As shown in Figure 18, the outer side of the magnetic cylinder 634 is provided with a gear section 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 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.

[0079] A method for manufacturing a magnetic ring, wherein the aforementioned magnetic ring 44 manufacturing equipment performs the following steps:

[0080] Step S1: Fill the mold cavity with magnetic powder mixture 660;

[0081] 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;

[0082] 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.

[0083] Step S4: Start the pressing component to press the blank into a pre-formed blank;

[0084] Step S5: The sintered blank is a permanent magnet ring. 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. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating relative importance.

[0085] 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 magnetic ring (44) is divided into multiple magnetic domains (440) along the circumferential direction. On the annular surface (443) of the magnetic ring (44), 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 or 2, characterized in that: On the annular surface (443), the magnetic field lines in each of the magnetic domains (440) are the radial lines (445) of the annular surface (443).

4. The magnetic ring according to claim 3, characterized in that: The magnetic ring (44) is uniformly divided into multiple identical magnetic domains (440) along the circumferential direction, and each magnetic domain (440) is fan-shaped on the annular surface (443).

5. The magnetic ring according to claim 3, characterized in that: The magnetic ring (44) is divided into bar magnetic domains (4401) and fan magnetic domains (4402) along the circumferential direction. On the same annular surface (443), the bar magnetic domains (4401) and the fan magnetic domains (4402) are alternately distributed, and multiple bar magnetic domains (4401) are arranged at equal intervals along the circumferential direction.

6. The magnetic ring according to claim 5, characterized in that: Two adjacent bar magnetic domains (4401) are arranged continuously on the inner ring sidewall (441), and two adjacent bar magnetic domains (4401) are arranged at intervals on the outer ring sidewall (442).

7. The magnetic ring according to claim 1 or 2, characterized in that: On the annular surface (443), the magnetic field lines in each magnetic domain (440) are set at an angle to the radial direction (445) of the annular surface (443), so that multiple magnetic domains (440) form a vortex arrangement on the same annular surface (443).

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 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 outer sidewall of the moving iron core (31).

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

11. The DC contactor according to claim 9, characterized in that: The 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 the coil assembly. 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).

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