Direct current contactor

Abstract

The direct current contactor comprises a shell, an electromagnetic system and a contact system arranged in the shell along an axial direction, the electromagnetic system comprises an armature assembly and two coil assemblies, the two coil assemblies are arranged along the axial direction of the shell for driving the armature assembly to move linearly, each coil assembly comprises a coil framework, the contact system comprises a moving contact assembly and a stationary contact assembly, the moving contact assembly is driven by the armature assembly to contact or separate from the stationary contact assembly, the electromagnetic system further comprises a magnetic ring, the magnetic ring is located between the two coil assemblies, a moving core of the armature assembly slides up and down on the middle part of the two coil frameworks and the magnetic ring along the axial direction of the shell, and the inner ring side wall and the outer ring side wall of the magnetic ring are two magnetic poles with opposite magnetism respectively. In the utility model, the moving core is surrounded by the magnetic ring to form a surrounding magnetic loop, the moving core is uniformly stressed and deviation is not caused, local magnetic field density is avoided to be too high, the assembly process is simplified, and automatic assembly can be realized.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical appliances, specifically to a DC contactor. Background Technology

[0002] DC contactors, as key control devices in charging piles, are widely used. However, their high heat generation and energy consumption during long-term use 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 two or more magnets inevitably leads to deviations in the dimensional tolerances, magnetic properties, and assembly positions of each magnet. The magnetic force causes deviations in the movement of the moving iron core or armature, posing a risk of product failure. Second, when using two or more magnets, the same magnetic poles of multiple magnets need to face the moving iron core. This requires manual or tooling to fix the magnets in place against repulsive forces before proper assembly, making automated assembly difficult. Third, space constraints limit the number of magnets that can be placed, making it impossible to guarantee magnetic field strength and leading to magnetic saturation. Summary of the Invention

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

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

[0005] This utility model provides a DC contactor, including a housing. An electromagnetic system and a contact system are arranged axially inside the housing. The electromagnetic system includes an armature assembly and two coil assemblies. The two coil assemblies are arranged axially along the housing to drive the armature assembly to move linearly. Each coil assembly includes a coil frame. The contact system includes a moving contact assembly and a stationary contact assembly. The armature assembly drives the moving contact assembly to contact or separate from the stationary contact assembly. The electromagnetic system also includes a magnetic ring located between the two coil assemblies. The moving iron core of the armature assembly slides up and down along the axial direction of the housing at the middle of the two coil frames and the magnetic ring. The inner and outer sidewalls of the magnetic ring are two magnetic poles with opposite magnetic properties.

[0006] Furthermore, the two coil frames are inserted into each other near the magnetic ring to form an insertion structure, which corresponds to the center position of the coil frame, or the insertion structure corresponds to both sides of the coil frame.

[0007] Furthermore, the plug-in structure corresponds to the central position of the coil frame, the magnetic ring is sleeved on the outside of the plug-in structure, and the plug-in structure is located between the inner ring sidewall of the magnetic ring and the outer sidewall of the moving iron core.

[0008] Furthermore, one end of one of the coil frames is provided with a 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, so that the moving iron core can slide through the insertion part. The end of the insertion part is inserted into the insertion groove, and the magnetic ring is sleeved on the outside of the insertion part.

[0009] Furthermore, the plug-in structure corresponds to the opposite sides of one end of the coil frame, forming an installation space for assembling the magnetic ring between the two coil frames. The outer ring sidewall edge of the magnetic ring is provided with a clearance notch, and the plug-in structure passes through the clearance notch.

[0010] Furthermore, the inner ring sidewall of the magnetic ring is in sliding contact with the moving iron core.

[0011] Furthermore, one end of one of the coil frames is provided with two limiting protrusions, and the two limiting protrusions are symmetrically arranged on opposite sides of one end of the coil frame. One end of the other coil frame is provided with two pillars, each pillar being inserted into one of the limiting protrusions. The edge of the magnetic ring is provided with two clearance notches, each clearance notch allowing one of the limiting protrusions and one of the pillars to pass through.

[0012] 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.

[0013] Furthermore, the bottom of the mounting groove is through, allowing the outer wall of the moving iron core to slide in contact with the inner ring sidewall of the magnetic ring; or, the bottom of the mounting groove is located between the outer wall of the moving iron core and the inner ring sidewall of the magnetic ring.

[0014] Furthermore, each coil frame is fitted with a coil on its outer side, and each coil frame is also provided with a coil insert at one end. The coil insert is connected to the coil on the same coil frame. When the two coil assemblies are arranged along the axial direction of the housing, the coil inserts of the two coil frames elastically abut against each other. The coil insert near the stationary contact assembly is used to elastically connect with the stationary contact assembly.

[0015] Furthermore, the end of the coil frame is provided with a column, and the column has a slot for assembling the coil insert. The coil insert and the slot are provided with a buckle and a locking mechanism that cooperate with each other.

[0016] Furthermore, the edge of the magnetic ring is provided with at least one clearance notch, and the post equipped with the coil insert passes through the clearance notch.

[0017] The DC contactor of this invention features a magnetic ring between two coil assemblies. The magnetic ring is a single, integral structure with clearly defined magnetic poles, forming a surrounding magnetic circuit around the moving iron core. This ensures uniform force distribution on the moving iron core, preventing deviations and avoiding excessively high local magnetic field density. Furthermore, the magnetic ring is an indivisible unit with uniform dimensional tolerances, eliminating the need to overcome like-pole repulsion during assembly and preventing positional deviations. This simplifies the assembly process and enables automated assembly.

[0018] 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 the magnetic force of the electromagnetic system.

[0019] 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.

[0020] In addition, the two coil assemblies are elastically connected by coil inserts, and the coil inserts are elastically connected to the stationary contact assembly, which has the advantages of simple structure and convenient connection. Attached Figure Description

[0021] Figure 1 This is an exploded view of the DC contactor of this utility model. Figure 1 ;

[0022] Figure 2 This is an exploded view of the DC contactor of this utility model. Figure 2 ;

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

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

[0025] Figure 5 This is a schematic diagram of the coil assembly in the first embodiment of this utility model;

[0026] Figure 6 This is a cross-sectional view of the coil assembly in the first embodiment of this utility model;

[0027] Figure 7 This is an exploded view of the coil assembly in the first embodiment of this utility model;

[0028] Figure 8 This is a schematic diagram of the structure of the first coil assembly in the first embodiment of this utility model. Figure 1 ;

[0029] Figure 9 This is a schematic diagram of the structure of the first coil assembly in the first embodiment of this utility model. Figure 2 ;

[0030] Figure 10 This is a cross-section of the first coil assembly in the first embodiment of this utility model. Figure 1 ;

[0031] Figure 11 This is a cross-section of the first coil assembly in the first embodiment of this utility model. Figure 2 ;

[0032] Figure 12 This is a schematic diagram of the structure of the first coil insert in the first embodiment of this utility model;

[0033] Figure 13 This is a schematic diagram of the structure of the second coil assembly in the first embodiment of this utility model. Figure 1 ;

[0034] Figure 14 This is a schematic diagram of the structure of the second coil assembly in the first embodiment of this utility model. Figure 2 ;

[0035] Figure 15 This is a cross-sectional view of the second coil assembly in the first embodiment of this utility model;

[0036] Figure 16 This is a schematic diagram of the structure of the second coil insert in the first embodiment of this utility model;

[0037] Figure 17 This is a schematic diagram of the coil assembly in the second embodiment of this utility model;

[0038] Figure 18 This is a cross-sectional view of the coil assembly in the second embodiment of this utility model;

[0039] Figure 19 This is an exploded view of the coil assembly in the second embodiment of this utility model;

[0040] Figure 20 This is a schematic diagram of the structure of the first coil assembly in the second embodiment of this utility model. Figure 1 ;

[0041] Figure 21 This is a schematic diagram of the structure of the first coil assembly in the second embodiment of this utility model. Figure 2 ;

[0042] Figure 22 This is a cross-sectional view of the first coil assembly in the second embodiment of this utility model;

[0043] Figure 23 This is a schematic diagram of the structure of the second coil assembly in the second embodiment of this utility model. Figure 1 ;

[0044] Figure 24 This is a schematic diagram of the structure of the second coil assembly in the second embodiment of this utility model. Figure 2 ;

[0045] Figure 25 This is a top view of the second coil assembly in the second embodiment of this utility model;

[0046] Figure 26 This is a cross-sectional view of the second coil assembly in the second embodiment of this utility model;

[0047] Figure 27 This is a schematic diagram of the structure of the second coil insert in the second embodiment of this utility model;

[0048] Figure 28 This is a schematic diagram of the coil assembly in the third embodiment of this utility model;

[0049] Figure 29 This is a cross-sectional view of the coil assembly in the third embodiment of this utility model;

[0050] Figure 30 This is an exploded view of the coil assembly in the third embodiment of this utility model;

[0051] Figure label:

[0052] 1-Outer shell, 101-Bottom shell, 102-Top cover, 2-Contact system, 21-Stationary contact assembly, 211-Lead-out end, 3-Armature assembly, 31-Moving iron core, 4-Coil assembly, 411-First coil frame, 412-Second coil frame, 413-Integral structure, 4111-First post, 4121-Second post, 4131-Third post, 4100-Annular protrusion, 4101-Through hole, 4102-Plug-in part, 4103-Plug-in slot, 4104-Limiting protrusion, 41 05-Insert clearance opening, 4106-Installation space, 4107-Insert slot, 4108-Bayonet, 42-Coil, 43-Coil insert, 430-Snap fastener, 431-First coil insert, 4311-First body, 4312-Duck-shaped spring, 4313-Side spring, 4314-Welding groove, 432-Second coil insert, 4321-Second body, 4322-Spring end, 4323-Welding hole, 4324-Welding part, 4325-Short spring, 44-Magnetic ring, 5-Inner shell. Detailed Implementation

[0053] The specific embodiments of the DC contactor of this utility model are further described below with reference to the accompanying drawings. The DC contactor of this utility model is not limited to the descriptions in the following embodiments.

[0054] like Figure 1-3 As shown, the 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 on 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 along a straight line. To facilitate movement, the electromagnetic system typically includes multiple permanent magnets symmetrically distributed along the circumference of the moving iron core 31, used in conjunction 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, and 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 to extinguish the arc generated by the moving contact assembly and the stationary contact assembly 21.

[0055] The improvement of this application lies in the fact that the electromagnetic system no longer uses multiple permanent magnets, such as Figure 4 As shown, the electromagnetic system includes a magnetic ring 44, which replaces multiple permanent magnets. The magnetic ring 44 is located between two coil assemblies 4. The moving iron core 31 of the armature assembly 3 slides 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 inner ring sidewall and the outer ring sidewall of the magnetic ring 44 are two magnetic poles with opposite magnetic properties.

[0056] Thus, a magnetic ring 44 is set between the two coil components 4. The magnetic ring 44 is an integral structure with a clearly defined magnetic pole, forming a surrounding magnetic circuit around the moving iron core 31. This ensures that the moving iron core 31 is subjected to uniform force and will not produce deviations, thus avoiding excessively high local magnetic field density. In addition, the magnetic ring 44 is an indivisible whole with uniform tolerance dimensions. During the assembly process, it is not necessary to overcome like-pole repulsion forces, thus avoiding deviations in the assembly position, simplifying the assembly process, and enabling automatic assembly.

[0057] Furthermore, the inner ring sidewall of the magnetic ring 44 can slide against the moving iron core 31, meaning the inner ring sidewall of the magnetic ring 44 and the moving iron core 31 slide against each other, reducing the magnetic gap and increasing the total magnetic flux and the magnetic force of the electromagnetic system. This is suitable when the magnetic ring 44 is made of a permanent magnet core material with good insulation properties, such as ferrite. Of course, when the magnetic ring 44 is made of a permanent magnet material with electrical conductivity, such as neodymium iron boron, an insulating structure can be provided between the moving iron core 31 and the inner ring sidewall of the magnetic ring 44.

[0058] Preferably, one end of each of the two coil frames is inserted to form a connection structure, and the connection structure is located at the end of the coil frame near the magnetic ring 44, corresponding to the center position of the coil frame. For example, one end of one coil frame has a connection groove 4103, and one end of the other coil frame protrudes outward to form a connection portion 4102. The connection portion 4102 is coaxial with the moving iron core 31, allowing the moving iron core 31 to slide through the connection portion 4102. The end of the connection portion 4102 is inserted into the connection groove 4103, and the magnetic ring 44 is sleeved on the outside of the connection portion 4102. In this case, the connection structure is located between the inner ring sidewall of the magnetic ring 44 and the moving iron core 31, separating the magnetic ring 44 from the moving iron core 31, thus providing insulation; or... 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 4104 on the opposite sides, and each limiting protrusion 4104 has 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 4104. An installation space 4106 for assembling the magnetic ring 44 is formed between one end of the two coil frames. The outer ring sidewall edge of the magnetic ring 44 has a clearance notch. 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 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.

[0059] Of course, the two coil frames can also be an integral structure 413. In this case, an installation groove for assembling the magnetic ring 44 needs to be reserved in the integral structure 413. The installation groove can be connected to the moving iron core 31 so that the inner ring sidewall of the magnetic ring 44 slides in contact with the moving iron core 31. Alternatively, the bottom of the installation groove can be blocked between the inner ring sidewall of the magnetic ring 44 and the moving iron core 31 to achieve insulation.

[0060] Furthermore, each coil frame is provided with a coil insert 43 at one end. The coil insert 43 is connected to the coil 42. When the two coil assemblies 4 are arranged along the axial direction of the outer shell 1, the coil inserts 43 of the two coil frames are elastically abutted. The coil insert 43 near the stationary contact assembly 21 can be elastically connected to the stationary contact assembly 21, which has the advantages of simple structure and convenient connection.

[0061] Combination Figure 1-16 A specific embodiment of the first type of DC contactor is provided.

[0062] like Figure 1-4 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. The top cover 102 covers the bottom shell 101. An inner shell 5 is assembled inside the outer shell 1. The electromagnetic system and the contact system 2 are jointly assembled in the inner shell 5.

[0063] like Figure 3 , 4 As shown, the electromagnetic system includes an armature assembly 3, a coil assembly 4, and a magnetic ring 44. 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 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 and has an extension end 211. The extension end 211 extends axially towards the coil assembly 4 inside the outer shell 1. The moving contact assembly is driven by the moving iron core 31 to contact or separate from the stationary contact assembly 21. In this embodiment, there are two coil assemblies 4, and two coil groups... The components 4 are arranged along the axial direction of the outer shell 1. Each coil assembly 4 includes a coil frame with a coil 43 wound on it. A magnetic ring 44 is disposed between two coil assemblies 4. The moving iron core 31 slides up and down axially in the middle of the coil frame and the magnetic ring 44. The inner and outer ring sidewalls of the magnetic ring 44 are two magnetic poles with opposite magnetic properties. In this embodiment, the inner ring sidewall of the magnetic ring 44 is the N pole and the outer ring sidewall is the S pole. The magnetic ring 44 forms a magnetic loop around the moving iron core 31, so that the moving iron core 31 is uniformly stressed and will not produce deviations. This avoids excessively high 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 deviations in assembly position, simplifying the assembly process, and enabling automatic assembly.

[0064] In this embodiment, as Figure 1-16 As shown, one end of the two coil frames is plugged in to form a plug-in structure. The plug-in structure corresponds to the central position of the end of each coil frame. The magnetic ring 44 is sleeved on the plug-in structure, so that the plug-in structure is located between the inner ring side wall of the magnetic ring 44 and the outer side wall 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.

[0065] Furthermore, the end of the coil frame is provided with a coil insert 43. Preferably, the end of the coil frame is provided with a post for mounting the coil insert 43. The post has an insertion slot 4107 for inserting the coil insert 43. Preferably, a buckle 430 and a bayonet 4108 are provided between the coil insert 43 and the insertion slot 4107 to achieve stable and fast assembly. The coil insert 43 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 43 of the two coil frames elastically abut against each other. The coil insert 43 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 43 can pass.

[0066] Combination Figure 4-16 A coil assembly 4 is provided for use in this embodiment. In this structure, the two coil assemblies 4 are plugged in. A plug-in structure is provided between the magnetic ring 44 and the moving iron core 31. The plug-in structure serves as an insulation structure.

[0067] For ease of description, the two coil assemblies 4 are divided into a first coil assembly and a second coil assembly, wherein the first coil assembly is closer to the stationary contact assembly 21, and the second coil assembly is relatively farther away from the stationary contact assembly 21. Correspondingly, the coil inserts 43 assembled on the first coil assembly and the second coil assembly are divided into a first coil insert 431 and a second coil insert 432.

[0068] like Figure 5-11As shown, the first coil assembly includes a first coil frame 411 and a first coil wound on the first coil frame 411. The first coil frame 411 is cylindrical and has a through hole 4101. The moving iron core 31 is slidably assembled in the through hole 4101. Both ends of the first coil frame 411 extend radially outward to form annular protrusions 4100. One end of the first coil frame 411 has a first post 4111 protruding axially outward. The first post 4111 is located at the edge of the annular protrusion 4100. The first post 4111 has a first insert slot 4107 for inserting the first coil insert 431. The other end of the first coil frame 411 has an insert clearance opening 4. 105. The insertion slot 4105 corresponds to the position of the first column 4111. In this embodiment, the first column 4111 is provided with two parallel first insertion slots 4107, and the two first insertion slots 4107 are respectively provided on opposite sides of the insertion slot 4105. A clearance groove is provided between the two first insertion slots 4107, and the clearance groove is connected to the insertion slot 4105. Each first insertion slot 4107 is provided with a first coil insertion piece 431. The first coil insertion piece 431 is welded to the first coil. Preferably, the edge of the insertion slot 4105 extends outward along the direction away from the column to form a limiting protrusion 4104, which is conducive to cooperating with the second coil insertion piece 432 in the second coil assembly.

[0069] One end of the first coil frame 411 protrudes outward to form a plug-in portion 4102. The plug-in portion 4102 is a hollow cylindrical shape and is coaxial with the through hole 4101 of the first coil frame 411. In this embodiment, the plug-in portion 4102 is an annular protrusion formed by the axial outward protrusion of the edge of the through hole 4101 of the first coil frame 411. Correspondingly, a plug-in groove 4103 is provided at one end of the second coil assembly. The end of the plug-in portion 4102 is correspondingly plugged and limited in the plug-in groove 4103, so that the first coil assembly and the second coil assembly are plugged in axially. The magnetic ring 44 is sleeved on the outside of the plug-in portion 4102, so that the inner ring sidewall of the magnetic ring 44 is in contact with the circumferential sidewall of the plug-in portion 4102. That is, the plug-in structure is located between the inner ring sidewall of the magnetic ring 44 and the outer sidewall of the moving iron core 31, and has an insulating function.

[0070] like Figure 5-7As shown in Figures 13-15, the second coil assembly includes a second coil frame 412 and a second coil wound on the second coil frame 412. The second coil frame 412 is also cylindrical and has through holes 4101. The first coil frame 411 and the second coil frame 412 are connected through their respective through holes 4101, allowing the moving iron core 31 to move within the through holes 4101 of the two coil frames. Both ends of the second coil frame 412 extend radially outward to form annular protrusions 4100. A second post 4121 protrudes from the edge of one of the annular protrusions 4100. Figure 5 , 7 In the first coil frame 411, the second column 4121 is a straight plate protruding from the direction opposite to the second coil frame 412, so that the second column 4121 is opposite to the insert clearance opening 4105 of the first coil frame 411. The second column 4121 is provided with a second insert groove 4107, which is provided with a retaining 4108 and a through hole for welding. The second coil insert 432 is inserted into the second insert groove 4107, and the second coil is welded to the second coil insert 432. The second coil insert 432 is in elastic contact with the first coil insert 431. Figure 5 , 7 In 13 and 14, the second column 4121 is equipped with two parallel second coil inserts 432, and the two second coil inserts 432 are elastically connected to the two first coil inserts 431 respectively; a plug-in groove 4103 is provided at one end of the second coil frame 412. In this embodiment, the plug-in groove 4103 is an annular groove surrounding the through hole 4101, and the plug-in groove 4103 and the second column 4121 are respectively provided at opposite ends of the second coil frame 412.

[0071] Of course, in this structure, the plug-in part 4102 can also be provided on the second coil frame 412, and correspondingly, the plug-in slot 4103 is provided on the first coil frame 411.

[0072] Combination Figure 7-9 12 provides a first coil insert 431 applied in this embodiment.

[0073] like Figure 12As shown, the first coil insert 431 includes a sheet-like first body 4311. One end of the first body 4311 serves as an assembly end, and the end sidewall of the assembly end forms a gradually narrowing slope to facilitate insertion of the assembly end into the first insert slot 4107. A resilient buckle 430 is provided in the middle of the first body 4311. The buckle 430 is a rectangular plate, and it protrudes obliquely along a direction forming an angle with the first body 4311. Preferably, the buckle 430 is located closer to the assembly end. When the first coil insert 431 is inserted into the first insert slot 4107, the buckle 430 engages with the latch 4108 provided in the first insert slot 4107. The other end of the first body 4311 extends and folds back to form a duck-shaped spring tab 4312. The duck-shaped spring 4312 and the buckle 430 correspond to the same side of the first body 4311. A hollow area is provided in the middle of the duck-shaped spring 4312. The duck-shaped spring 4312 can be elastically engaged with the lead-out end 211 of the stationary contact assembly 21. A side spring 4313 is also provided on the side of the first body 4311. The side spring 4313 is a strip plate parallel to the first body 4311. The side spring 4313 has a welding groove 4314 at the end near the duck-shaped spring 4312. The first coil is welded to the side spring 4313 through the welding groove 4314. The other end of the side spring 4313 is located outside the first insert slot 4107. The side spring 4313 corresponds to the insert clearance opening 4105, which facilitates elastic engagement with the second coil insert 432.

[0074] Combination Figure 7 , 13 -15 provides a second coil insert 432 for use in this embodiment.

[0075] like Figure 15 As shown, the second coil insert 432 includes a sheet-like second body 4321. One end of the second body 4321 serves as an assembly end, similar to the first coil insert 431. The end sidewall of the assembly end forms a gradually narrowing slope to facilitate insertion of the assembly end into the second insert slot 4107. The second body 4321 also has a resilient buckle 430 in the middle, located closer to the assembly end. In the figure, the buckle 430 is a rectangular plate that protrudes outwards along a direction forming an angle with the second body 4321. The other end is bent back to form a spring end 4322. The spring end 4322 and the buckle 430 are located on the front and back sides of the second body 4321, respectively. When the second coil insert 432 is inserted into the second insert slot 4107, the spring end 4322 protrudes from the second insert slot 4107 for elastic contact with the first coil insert 431. The second body 4321 is also provided with a welding hole 4323. Preferably, the second column 4121 is also provided with a hole corresponding to the welding hole 4323. The second coil is welded to the second body 4321 through the welding hole 4323.

[0076] Combination Figure 1-4 Sections 17-27 provide specific embodiments of a second type of DC contactor.

[0077] like Figure 1-4 As shown, the DC contactor includes the same outer shell 1, inner shell 5, and contact system 2 as in the first embodiment. Its electromagnetic system is similar to that in the first embodiment. The electromagnetic system includes an armature assembly 3, a coil assembly 4, and a magnetic ring 44, wherein the armature assembly 3 is the same as in the first embodiment, and the magnetic ring 44 and the coil assembly 4 are similar to those in the first embodiment.

[0078] like Figure 17-27 As shown, in this embodiment, there are also two coil assemblies 4, and the two coil assemblies 4 are arranged along the axial direction of the outer shell 1. Along the axial direction of the outer shell 1, the magnetic ring 44 is located between the two coil assemblies 4. The inner ring sidewall of the magnetic ring 44 is the N pole, and the outer ring sidewall of the magnetic ring 44 is the S pole. The magnetic ring 44 forms a surrounding magnetic circuit around the moving iron core 31. The inner ring sidewall of the magnetic ring 44 is in sliding engagement with the outer sidewall of the moving iron core 31. Preferably, the inner ring sidewall of the magnetic ring 44 is in sliding contact with the outer sidewall of the moving iron core 31. The edge of the magnetic ring 44 is provided with two clearance notches, and the two clearance notches are symmetrically arranged on opposite sides of the magnetic ring 44.

[0079] Preferably, the two coil assemblies 4 also adopt a plug-in fit, and the two coil assemblies 4 also form a plug-in structure near one end of the magnetic ring 44. Unlike the first embodiment, the plug-in structure is correspondingly arranged on opposite sides of one end of the coil assembly 4. That is, at least one pair of limiting protrusions 4104 are provided at one end of one coil assembly 4, and the pair of limiting protrusions 4104 are spaced apart. Each limiting protrusion 4104 has a groove for plugging in. One end of the other coil assembly 4 is provided with a post, which can be plugged in to the groove of the limiting protrusion 4104. Further, an installation space 4106 for installing the magnetic ring 44 is formed between the ends of the two coil assemblies 4. The outer ring sidewall of the magnetic ring 44 is provided with a clearance notch for the plug-in structure to pass through.

[0080] Combination Figure 17-22 A coil assembly 4 is provided for use in this embodiment. For ease of description, the two coil assemblies 4 are divided into a first coil assembly and a second coil assembly. Preferably, the first coil assembly and the second coil assembly are also connected by plugging, thereby simplifying the processing technology of the coil assembly 4. The first coil assembly is closer to the stationary contact assembly 21, and the second coil assembly is relatively far away from the stationary contact assembly 21. Correspondingly, the coil inserts 43 assembled on the first coil assembly and the second coil assembly are divided into a first coil insert 431 and a second coil insert 432.

[0081] like Figure 17-22As shown, the first coil assembly is similar to the first coil assembly in the first embodiment. The first coil assembly includes a first coil frame 411 and a first coil wound on the first coil frame 411. The first coil frame 411 has the same through hole 4101 and two annular protrusions 4100 as in the first embodiment. One of the annular protrusions 4100 is provided with a first post 4111 as in the first embodiment. The first post 4111 is fitted with a first coil insert 431 as in the first embodiment. Unlike the first embodiment, the other annular protrusion 4100 is... The 0 has two insert clearance openings 4105, and the two insert clearance openings 4105 are symmetrically distributed on opposite sides of the annular protrusion 4100. The edge of each insert clearance opening 4105 extends outward along the direction away from the column to form a limiting protrusion 4104. Each limiting protrusion 4104 passes through a clearance notch of the magnetic ring 44. The position of the limiting protrusion 4104 corresponding to the insert clearance opening 4105 can be used as a groove for insertion with the column. Unlike the first embodiment, the first coil frame 411 in this embodiment does not have an insertion part 4102.

[0082] Combination Figure 17-19 23-27 provides a second coil assembly used in this embodiment.

[0083] like Figure 23-26 As shown, the second coil assembly includes a second coil frame 412 and a second coil wound on the second coil frame 412. The second coil frame 412 is also cylindrical and has a through hole 4101. The first coil frame 411 and the second coil frame 412 are connected through their respective through holes 4101, allowing the moving iron core 31 to move within the through holes 4101 of the two coil frames. Both ends of the second coil frame 412 also extend radially outward to form annular protrusions 4100. A protruding second post 4121 is provided on the edge of one of the annular protrusions 4100. Figure 22-24 In section 26, the second post 4121 is a straight plate, protruding along the direction opposite to the second coil frame 412, so that the second post 4121 is opposite to the insert clearance opening 4105 of the first coil frame 411. The second post 4121 is provided with a second insert groove 4107, which is provided with a retaining 4108 and a through hole for welding. The second coil insert 432 is inserted into the second insert groove 4107, and the second coil is welded to the second coil insert 432. The second coil insert 432 is in elastic contact with the first coil insert 431. Figure 23-25In the first embodiment, the second column 4121 is equipped with two parallel second coil inserts 432, which are elastically connected to two corresponding first coil inserts 431. Unlike the first embodiment, the second coil frame 412 also includes a third column 4131. The third column 4131 and the second column 4121 are spaced apart and opposite each other on the same annular protrusion 4100. The second column 4121 and the third column 4131 are respectively inserted into two limiting protrusions 4104 on the first coil frame 411. The second column 4121 and... The corresponding limiting protrusion 4104 passes through a clearance notch in the magnetic ring 44. The second coil insert 432, located on the second column 4121, elastically abuts against the first coil insert 431 on the first column 4111. The third column 4131 and another limiting protrusion 4104 pass through another clearance notch in the magnetic ring 44. Thus, the magnetic ring 44 is limited and assembled between the first coil frame 411 and the second coil frame 412. The magnetic ring 44 is limited within the two interlocking coil assemblies 4, which has the advantages of simple assembly and convenient processing. In this embodiment, the third column 4131 can adopt the same structure as the second column 4121. In this case, the third column 4131 can be provided with a second insert slot 4107, or it can be without a second insert slot 4107.

[0084] Combination Figure 24-27 A second coil insert 432 is provided for use in this embodiment.

[0085] like Figure 17-19 As shown in Figure 27, the second coil insert 432 includes a sheet-like second body 4321. One end of the second body 4321 serves as an assembly end, and the end sidewall of the assembly end forms a gradually narrowing slope to facilitate insertion of the assembly end into the second insert slot 4107. The other end of the second body 4321 is provided with a rod-shaped welding part 4324. A protruding buckle 430 is provided on one side of the second body 4321 connecting the assembly end and the welding part 4324. Preferably, a strip-shaped groove is provided in the middle of the second body 4321. On the other side of 1, there is a short spring piece 4325. The short spring piece 4325 extends outward from the edge of the second body 4321. In the figure, the short spring piece 4325 is approximately rectangular and is located on opposite sides of the second body 4321, respectively, along with the buckle 430. When the second body 4321 is inserted into the second insert slot 4107, the buckle 430 engages with the slot 4108 of the second insert slot 4107. The short spring piece 4325 is located outside the second insert slot 4107 and is used to elastically abut against the side spring piece 4313 in the first coil insert 431.

[0086] Combination Figure 1-4 Sections 28-30 provide specific embodiments of a third type of DC contactor.

[0087] like Figure 1-4As shown, the DC contactor includes the same outer shell 1, inner shell 5, and contact system 2 as in the first embodiment. Its electromagnetic system is similar to that in the first embodiment. The electromagnetic system includes an armature assembly 3, a coil assembly 4, and a magnetic ring 44, wherein the armature assembly 3 is the same as in the first embodiment, and the magnetic ring 44 and the coil assembly 4 are similar to those in the first embodiment.

[0088] In this embodiment, there are also two coil assemblies 4. However, unlike the first and second embodiments, the two coil frames share the same coil frame. That is, two coils 42 are wound on the same coil frame and the two coils 42 are distributed along the axial direction of the coil frame. A mounting groove for assembling a magnetic ring 44 is formed in the middle of the coil frame. The bottom of the mounting groove can communicate with the through hole 4101 in the middle of the coil frame, so that the inner ring sidewall of the magnetic ring 44 slides in contact with the outer sidewall of the moving iron core 31. Alternatively, the bottom of the mounting groove is located between the inner ring sidewall of the magnetic ring 44 and the outer sidewall of the moving iron core 31. The bottom of the mounting groove separates the inner ring sidewall of the magnetic ring 44 from the outer sidewall of the moving iron core 31, thus providing insulation. Preferably, the magnetic ring 44 is set in the coil frame by injection molding.

[0089] In addition, a column is provided at one end of the coil frame. The column is located at the end of the coil frame near the stationary contact. A coil insert 43 is provided on the column. The coil insert 43 is welded to the coil 42. When the coil assembly 4 is assembled in the housing 1, the coil insert 43 is elastically connected to the lead-out end 211 on the stationary contact assembly 21.

[0090] Combination Figures 28-30 A coil assembly 4 is provided for use in this embodiment.

[0091] like Figure 29 As shown, the coil assembly 4 includes a coil frame and a coil 42 wound around the outside of the coil frame. The two coil frames are an integral structure 413 formed by injection molding. Figure 28 In the integrated structure 413, there are two annular bodies and an annular disk between the two annular bodies. The inner ring sidewalls of the annular disk extend and connect to the inner ring sidewalls of the adjacent annular bodies, thereby forming a through hole 4101 for assembling the moving iron core 31. The interior of the annular disk forms a mounting groove for assembling the magnetic ring 44. It can also be understood that when forming the integrated structure 413, a mounting groove for assembling the magnetic ring 44 is reserved in the middle of the integrated structure 413. The bottom of the mounting groove is the side of the annular disk that is close to the moving iron core 31. The bottom of the mounting groove can communicate with the through hole 4101, so that the inner ring sidewall of the magnetic ring 44 can slide and engage with the outer sidewall of the moving iron core 31. Of course, the bottom of the mounting groove can also be closed. The bottom of the mounting groove can separate the inner ring sidewall of the magnetic ring 44 from the moving iron core 31. The bottom of the mounting groove can also serve as insulation.

[0092] One of the annular bodies is provided with a column. The structure of the column can be referred to the structure of the first column 4111 in the first embodiment. The first column 4111 is provided with a coil insert 43. The structure of the coil insert 43 can be referred to the first coil insert 431 in the first embodiment.

[0093] 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.

[0094] 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 DC contactor, comprising a housing (1), wherein an electromagnetic system and a contact system (2) are arranged axially inside 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, each coil assembly (4) comprising a coil frame, the contact system (2) comprising a moving contact assembly and a stationary contact assembly (21), wherein the moving contact assembly is driven by the armature assembly (3) to contact or separate from the stationary contact assembly (21); Its features are: The electromagnetic system also includes a magnetic ring (44), which is located between the two coil assemblies (4). The moving iron core (31) of the armature assembly (3) slides 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 inner ring sidewall and the outer ring sidewall of the magnetic ring (44) are two magnetic poles with opposite magnetic properties.

2. The DC contactor according to claim 1, characterized in that: The two coil frames are plugged into one end near the magnetic ring (44) to form a plug-in structure, which corresponds to the center position of the coil frame, or the plug-in structure corresponds to both sides of the coil frame.

3. The DC contactor according to claim 2, characterized in that: The plug-in structure corresponds to the central position of the coil frame. The magnetic ring (44) is sleeved on the outside of the plug-in structure. The plug-in structure is located between the inner ring sidewall of the magnetic ring (44) and the outer sidewall of the moving iron core (31).

4. The DC contactor according to claim 3, characterized in that: One end of one coil frame is provided with a insertion groove (4103), and one end of the other coil frame protrudes outward to form an insertion part (4102). The insertion part (4102) is coaxial with the moving iron core (31), so that the moving iron core (31) can slide through the insertion part (4102). The end of the insertion part (4102) is inserted into the insertion groove (4103), and the magnetic ring (44) is sleeved on the outside of the insertion part (4102).

5. The DC contactor according to claim 2, characterized in that: The plug-in structure corresponds to the opposite sides of one end of the coil frame, forming an installation space (4106) between the two coil frames for assembling the magnetic ring (44). The outer ring sidewall edge of the magnetic ring (44) is provided with a clearance notch, and the plug-in structure passes through the clearance notch.

6. The DC contactor according to claim 5, characterized in that: The inner ring sidewall of the magnetic ring (44) is in sliding contact with the moving iron core (31).

7. The DC contactor according to claim 6, characterized in that: One end of the coil frame is provided with two limiting protrusions (4104), and the two limiting protrusions (4104) are symmetrically arranged on opposite sides of one end of the coil frame. One end of the other coil frame is provided with two pillars, each pillar being inserted into one of the limiting protrusions (4104). The edge of the magnetic ring (44) is provided with two clearance notches, each clearance notch allowing one of the limiting protrusions (4104) and one of the pillars to pass through.

8. The DC contactor according to claim 1, characterized in that: The two coil frames are an integral structure (413), and the central part of the integral structure (413) is provided with a mounting groove for assembling the magnetic ring (44).

9. The DC contactor according to claim 8, characterized in that: The bottom of the mounting groove is open, so that the outer wall of the moving iron core (31) slides in contact with the inner ring sidewall of the magnetic ring (44); or, the bottom of the mounting groove is located between the outer wall of the moving iron core (31) and the inner ring sidewall of the magnetic ring (44).

10. The DC contactor according to any one of claims 1-7, characterized in that: A coil (42) is sleeved on the outside of each coil frame, and a coil insert (43) is provided at one end of each coil frame. The coil insert (43) 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 (43) of the two coil frames elastically abut against each other. The coil insert (43) near the stationary contact assembly (21) is used to elastically connect with the stationary contact assembly (21).

11. The DC contactor according to claim 10, characterized in that: The end of the coil frame is provided with a column, and the column has a slot (4107) for assembling the coil insert (43). The coil insert (43) and the slot (4107) are provided with a buckle (430) and a latch (4108) that cooperate with each other.

12. The DC contactor according to claim 11, characterized in that: The edge of the magnetic ring (44) is provided with at least one clearance notch, and the post equipped with the coil insert (43) passes through the clearance notch.

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