Contact mechanism, contact system and direct current contactor

Abstract

According to the contact mechanism, the contact system and the direct current contactor, the magnet yoke is used as a motion reference of the driving module, the magnet yoke is used for limiting the upper portion of the driving module through the limiting cooperation of the movable iron core which is in linkage connection with the magnet yoke and the driving module, the magnet yoke is used for limiting the lower portion of the driving module, and the auxiliary movable contact module is fixed on the magnet yoke through the installation frame. Interlocking and limiting with the driving module are realized, mechanical parameter adjustment and fixation of the auxiliary movable contact module can be completed before welding and sealing, and the working reliability of the auxiliary movable contact module after welding is ensured. Meanwhile, the height of the auxiliary movable contact module is determined by the height of the mounting frame fixed on the magnet yoke, the size chain is single, the superposition tolerance is small, and the risk of excessive or insufficient pushing caused by the fact that the movement stroke of the driving module is influenced by the tolerance is reduced.

Description

Technical Field

[0001] The utility model relates to the field of low-voltage electrical appliances, and particularly relates to a contact mechanism, a contact system and a DC contactor. Background Technique

[0002] DC contactors are widely used in fields such as charging piles, vehicle-mounted power management, and energy storage. Based on the continuous upgrade of new energy control systems, the working states of key control components need to be continuously monitored to ensure the normal and reliable operation of the system. Among them, the contactor, as the main switch and control component of the new energy system, the reliable operation of its load directly determines the reliable operation of the system. Therefore, the system needs to feedback signals on the switch state of the contactor to ensure the current working state of the contact bridge.

[0003] The existing DC contactors generally adopt the following solutions:

[0004] A micro switch is arranged in the ceramic contact chamber, and the movement driving module of the contact system is used to trigger the micro switch to output the current contact closing state. However, at present, the signal stability output by this solution is relatively poor, which affects the information feedback of the system, has potential failure risks, and has been proven to be less reliable in long-term application practice.

[0005] Alternatively, a mechanical contact is arranged in the ceramic contact chamber, and the movement driving module of the contact system is used to push the mechanical contact to output the current contact opening and closing state. At present, this solution has gradually become the mainstream practice of the current auxiliary contact system. For example, the auxiliary contact structure disclosed in CN202210392775.2 sets a mechanical reed on an insulating seat and places it in a ceramic seat, sets an insulating push rod on the movement driving module, and drives the insulating push rod to push the mechanical reed placed on the insulating seat through the movement driving module to output the current working state of the contactor; for example, the auxiliary contact structures disclosed in CN202111109082.X and CN201610947762.1 set the mechanical reed on the movement driving module and do a good job in electrical insulation with the main circuit, and drive the mechanical reed to close with the auxiliary point rod arranged on the ceramic seat through the movement of the movement driving module to output the working state; for example, the auxiliary contact structure disclosed in CN202211139451.4 focuses on expressing the interlock between the pushing mechanism and the moving contact piece rather than the movement driving module, avoiding the damage caused by excessive pushing.

[0006] However, in-depth research on the above solutions reveals the following problems:

[0007] 1. A relatively large number of plastic structural components are placed in the ceramic chamber, especially in the direction of the moving contact arc. It can operate normally when the working voltage is below 1000 VDC. However, when the working voltage exceeds 1000 VDC or even 1500 VDC, the plastic component structure is damaged under the strong arc erosion, affecting the structural stability. At the same time, gas will be released, polluting the pure gas environment in the contact chamber;

[0008] 2. Further analyzing the moving dimension chain, it can be known that the dimension reference of the motion driving module is the yoke. However, in the above solutions, the auxiliary contact system is usually set on the ceramic housing or other components, resulting in an overly long dimension chain between the auxiliary contact system and the yoke. After the dimensional tolerances of several parts are superimposed, the tolerance is too large, which will cause the motion stroke of the motion driving module to be affected by the tolerance, and there is a risk of over-pushing or insufficient pushing during the process;

[0009] 3. The auxiliary contact systems in the above solutions are more or less directly exposed in the ceramic contact chamber. When the arc intensity is relatively large, the strong arc movement will fill the entire ceramic contact chamber. The exposed auxiliary contact system may be short-circuited or even directly burned under the strong arc;

[0010] 4. The auxiliary contact system in the above solutions is not mechanically interlocked with the components of the motion driving module. The mechanical parameters of the auxiliary contact system cannot be directly tested and fixed. After the welding of the ceramic contact chamber is completed, the random change of the dimension chain may cause the mechanical parameters of the auxiliary contact system to deteriorate, resulting in a decrease in the reliability of the auxiliary contact system. Content of the Utility Model

[0011] The purpose of this utility model is to overcome at least one defect of the prior art and provide a contact mechanism, a contact system and a DC contactor.

[0012] To achieve the above purpose, this utility model adopts the following technical solutions:

[0013] The contact mechanism includes a moving iron core, a main spring that provides an elastic reset force for the moving iron core, a driving module, a yoke, a moving contact bridge and an auxiliary moving contact module. The moving iron core and the yoke are arranged opposite to each other. One end of the driving module passes through the yoke and is connected to the moving iron core. The other end of the driving module is in limit cooperation with the yoke and drives the moving contact bridge to switch the opening and closing states with the static contact. The auxiliary moving contact module includes a mounting bracket, a reed that is limit-mounted on the mounting bracket, and a push rod that is movably arranged on the mounting bracket. The mounting bracket is fixed on the yoke. An activity space for the moving contact bridge to move is formed between the mounting bracket and the yoke. The driving module can drive the push rod to push the reed to connect and disconnect two auxiliary static contacts.

[0014] Optionally, the mounting bracket includes a mounting base at the top of the mounting bracket and an outer bracket at the bottom of the mounting bracket, which is fixedly connected between the mounting base and the yoke. The mounting base is provided with a push rod groove that slidably cooperates with the push rod and a reed groove that cooperates with the reed. The push rod groove communicates with the movable space and the reed groove.

[0015] Optionally, the mounting base is provided with two reed grooves on both sides of the push rod groove; the auxiliary moving contact module includes two reeds respectively installed in the two reed grooves, and the two reeds are respectively electrically connected to the two auxiliary static contacts. The front ends of the two reeds are spaced apart in the vertical direction and are arranged above the push rod.

[0016] Optionally, the reed is a sheet-like structure, and a perforation is provided at the rear end of the reed. The rear end of the reed extends outwards to form fins on both sides, and the rear end of the reed is also folded back to form an auxiliary static contact spring piece;

[0017] The rear end of the reed and the spring piece form a U shape; alternatively, the rear end of the reed and the spring piece form a V shape, and the end of the spring piece has a hook bent inwards.

[0018] Optionally, the reed groove includes an outer sink groove provided at the end of the mounting base, two side slots provided on both sides of the outer sink groove and used for cooperating with the fins, and an inner sink groove communicating between the outer sink groove and the push rod groove.

[0019] Optionally, the push rod groove includes a first sink provided in the middle of the mounting base and a second through hole provided in the middle of the first sink; the push rod includes a limiting plate slidably arranged in the first sink, a bump provided on the top surface of the limiting plate for pushing the reed, and a cylinder provided on the bottom surface of the limiting plate and slidably cooperating with the second through hole.

[0020] Optionally, the outer bracket includes two vertical plates, and the two vertical plates are integrally connected to both ends of the mounting base respectively.

[0021] Optionally, the outer bracket includes two U-shaped frames made of metal and with openings facing upwards, and the tops of the two U-shaped frames are respectively clamped and fixed to both ends of the mounting base.

[0022] Optionally, both ends of the mounting base are provided with bracket slots, the top of the U-shaped frame is provided with tongues that cooperate with the bracket slots, and the tongues are provided with convex bracts.

[0023] Optionally, the outer bracket further includes a connecting portion, and a first through hole for the driving module to pass through is provided in the middle of the connecting portion. Both ends of the connecting portion are integrally connected to the bottom plates of the two U-shaped frames respectively.

[0024] Optionally, the outer bracket is provided with a fixing groove, and the yoke is provided with a fixing protrusion fixedly inserted into the fixing groove.

[0025] Optionally, it further includes a fixing bracket fixed to the other end of the driving module and used to drive the push rod, a restoring spring for providing an elastic restoring force to the lower magnetic plate, a lower magnetic plate and an upper magnetic plate arranged oppositely, the upper magnetic plate is fixed on the fixing bracket, the middle part of the moving contact bridge is mounted on the lower magnetic plate, and both ends of the moving contact bridge extend out of the moving space and are respectively matched with two static contacts.

[0026] Optionally, the driving module includes a metal rod, an insulating seat for limiting and cooperating with the yoke, and two supporting gaskets. One end of the metal rod and one end of the supporting gasket are jointly injection-molded into the insulating seat. The metal rod is located in the middle of the insulating seat and between the two supporting gaskets; the fixing bracket is provided with a plugging hole for plugging and cooperating with the other end of the supporting gasket; one end of the restoring spring is connected to the lower magnetic plate, and the other end of the restoring spring is connected to the insulating seat.

[0027] The contact system includes a ceramic housing, an arc extinguishing component and the contact mechanism according to any one of the above. The ceramic housing is mounted on the yoke of the contact mechanism. The part of the contact mechanism located above the yoke is located inside the ceramic housing. The part of the contact mechanism located above the yoke at least includes an auxiliary moving contact module and a moving contact bridge. The arc extinguishing component is mounted on the outer side wall of the ceramic housing.

[0028] Optionally, the side wall of the mounting seat at the top of the mounting frame of the auxiliary moving contact module is fitted with the inner side wall of the ceramic housing. A sealed space is formed between the top wall and the side wall of the ceramic housing and the mounting seat. The reed of the contact mechanism is located in the sealed space. The push rod of the contact mechanism slides into the push rod groove of the mounting seat for communicating the sealed space with the moving space.

[0029] The DC contactor includes a mutually buckled housing and bottom cover, a plug, an electromagnetic system installed in the housing, a control circuit and the contact system according to any one of the above. The contact system is installed on the electromagnetic system. The two auxiliary static contacts of the contact system are respectively electrically connected to the control circuit. The plug is inserted into the jack on the housing and is electrically connected to the control circuit.

[0030] For the contact mechanism, contact system and DC contactor of the present utility model, the yoke serves as the motion reference of the driving module. The upper limit of the driving module by the yoke is realized through the limiting cooperation between the yoke and the moving iron core of the driving module which is linked. Moreover, the yoke also limits the lower limit of the driving module. The auxiliary moving contact module is fixed on the yoke through the mounting frame, realizing the interlocking limit with the driving module. The mechanical parameters of the auxiliary moving contact module can be adjusted and fixed before welding and sealing, ensuring the working reliability of the auxiliary moving contact module after welding. At the same time, the height of the auxiliary moving contact module is determined by the height of the mounting frame fixed on the yoke. The dimension chain is single and the superimposed tolerance is small, reducing the risk of excessive or insufficient pushing caused by the influence of the tolerance on the moving stroke of the driving module.

[0031] In addition, the mounting base and the push rod thereon and the ceramic housing form a closed airtight space for accommodating the reed, effectively preventing the spilled arc from invading the signal circuit.

[0032] In addition, both ends of the moving contact bridge extend out of the moving space and are respectively matched with two static contacts, so that the auxiliary moving contact module is away from the moving direction of the arc generated between the moving contact bridge and the static contacts, reducing gas pollution. Description of the Drawings

[0033] Figure 1 is an exploded view of the contactor of the present invention;

[0034] Figure 2 is a schematic structural view of the contact system of the present invention;

[0035] Figure 3 is a cross-sectional view of the contact system of the first embodiment of the present invention;

[0036] Figure 4 is a view of the contact mechanism of the first embodiment of the present invention;

[0037] Figure 5 is a cross-sectional view of the contact mechanism of the first embodiment of the present invention;

[0038] Figure 6 is a three-dimensional view of the contact mechanism of the first embodiment of the present invention;

[0039] Figures 7 - 9 is a schematic structural view of the auxiliary moving contact module of the first embodiment of the present invention;

[0040] Figures 10 - 12 is a schematic structural view of the outer bracket of the first embodiment of the present invention;

[0041] Figures 13 - 15 is a schematic structural view of the mounting base of the first embodiment of the present invention;

[0042] Figures 16 - 18 is a schematic structural view of the reed of the first embodiment of the present invention;

[0043] Figures 19 - 20 is a schematic structural view of the push rod of the present invention;

[0044] Figure 21 is a cross-sectional view of the contact system of the second embodiment of the present invention;

[0045] Figure 22 is a cross-sectional view of the contact mechanism of the second embodiment of the present invention;

[0046] Figure 23It is a three-dimensional view of the contact mechanism in the second embodiment of the present utility model;

[0047] Figure 24 It is a structural schematic diagram of the auxiliary moving contact module in the second embodiment of the present utility model;

[0048] Figures 25 - 27 It is a structural schematic diagram of the mounting bracket in the second embodiment of the present utility model;

[0049] Figure 28 It is a cross-sectional view of the contact system in the third embodiment of the present utility model;

[0050] Figure 29 It is a cross-sectional view of the contact mechanism in the third embodiment of the present utility model;

[0051] Figure 30 It is a three-dimensional view of the contact mechanism in the third embodiment of the present utility model;

[0052] Figures 31 - 33 It is a structural schematic diagram of the auxiliary moving contact module in the third embodiment of the present utility model;

[0053] Figures 34 - 36 It is a structural schematic diagram of the outer bracket in the third embodiment of the present utility model;

[0054] Figure 37 It is a cross-sectional view of the contact system in the fourth embodiment of the present utility model;

[0055] Figures 38 - 40 It is a structural schematic diagram of the reed in the fourth embodiment of the present utility model;

[0056] Figures 41 - 42 It is a structural schematic diagram of the driving module of the present utility model.

[0057] Housing 1; Plug 2; Contact system 3; Ceramic housing 31; Stationary contact 311; Auxiliary stationary contact point 312; Contact mechanism 32; Iron core sleeve 3201; Moving iron core 3202; Main spring 3203; Driving module 3204; Metal rod 32041; Insulating base 32042; Support gasket 32043; Yoke 3205; Fixed protrusion 32051; Copper tube 3206; Fixed bracket 3207; Restoration spring 3208; Lower magnetic sheet 3209; Moving contact bridge 3210; Upper magnetic sheet 3211; Auxiliary moving contact module 3212; Outer bracket 32121; Fixed groove 321211; U-shaped frame 321212; Bent wing 321213; Step 321214; Tongue 321215; Convex bud 321216; Connecting portion 321217; First through hole 321218; Vertical plate 321219; Mounting seat 32122; First counterbore 321221; Second through hole 321222; Inner sink 321223; Outer sink 321224; Side slot 321225; Bracket slot 321226; Support rib 321227; Push rod slot 321228; Reed slot 321229; Reed 32123; Perforation 321231; Wing 321232; Elastic piece 321233; Hook 321234; Push rod 32124; Convex point 321241; Cylinder 321242; Second counterbore 231243; Limiting plate 31244; Arc extinguishing component 33; Electromagnetic system 4; Control circuit 5; Bottom cover 6. Detailed implementation manners

[0058] The following embodiments given in conjunction with the accompanying drawings further illustrate the detailed implementation manners of the contact mechanism, contact system and DC contactor of the present utility model. The contact mechanism, contact system and DC contactor of the present utility model are not limited to the descriptions of the following embodiments.

[0059] As Figures 1 - 2As shown in the figure, the DC contactor of this embodiment includes a housing 1 and a bottom cover 6 that are snap-fitted together, a plug 2, an electromagnetic system 4 installed inside the housing 1, a control circuit 5, and a contact system 3. The contact system 3 is installed on the electromagnetic system 4. The contact system 3 includes a ceramic housing 31, an arc extinguishing assembly 33, and a contact mechanism 32. The ceramic housing 31 is installed on the yoke 3205 of the contact mechanism 32 through an iron bracket at the bottom of the ceramic housing 31. The part of the contact mechanism 32 above the yoke 3205 is located inside the ceramic housing 31, and the arc extinguishing assembly 33 is mounted on the outer side wall of the ceramic housing 31. On the top wall of the ceramic housing 31, there are two static contacts 311 distributed left and right and two auxiliary static contacts 312 distributed front and back. The two static contacts 311 are symmetrically arranged, and one end of the static contact 311 penetrates the top wall of the ceramic housing 31 and extends into the ceramic housing 31. The auxiliary static contact 312 is a rod-shaped structure that penetrates the ceramic housing 31. The part of the auxiliary static contact 312 outside the ceramic housing 31 is used for electrical connection with the control circuit 5, and the part of the auxiliary static contact 312 inside the ceramic housing 31 is used for electrical connection with the auxiliary moving contact. The two auxiliary static contacts 312 are symmetrically arranged. The parts of the two auxiliary static contacts 312 outside the ceramic housing 31 are respectively electrically connected to the control circuit 5. The plug 2 is inserted into the jack on the housing 1 and is electrically connected to the control circuit 5. It should be noted that the plug 2 of this embodiment is a standard part; the principle of the control circuit 5 is prior art. When the two auxiliary static contacts 312 are connected, the control circuit 5 feeds back a signal to the external system through the plug 2. When the two auxiliary static contacts 312 are disconnected, the control circuit 5 stops feeding back the signal to the external system, realizing the real-time monitoring of the on-off state between the two auxiliary static contacts 312 (i.e., the on-off state of the auxiliary circuit). Since the on-off state between the two auxiliary static contacts 312 is set to be consistent with the switch state of the contactor (i.e., the opening and closing state of the main contact), the control circuit 5 realizes the signal feedback of the switch state of the contactor through the switching of the on-off state between the two auxiliary static contacts 312. The arc extinguishing technology of the arc extinguishing assembly 33 is prior art, usually including two magnets mounted on the left and right sides of the ceramic housing 31. The two static contacts 311 are located between the two magnets, and the magnetic poles of the two magnets are arranged opposite to each other (for example, the N pole of one magnet is opposite to the S pole of the other magnet), and the arc generated between the static contact 311 and the moving contact bridge 3210 is extinguished by the magnetic field generated by the two magnets.

[0060] As Figures 4 - 6As shown in the figure, the contact mechanism 32 of this embodiment includes an iron core sleeve 3201, a moving iron core 3202, a main spring 3203 that provides an elastic restoring force for the moving iron core 3202, a driving module 3204, a yoke 3205, a copper tube 3206, a moving contact bridge 3210, and an auxiliary moving contact module 3212. The moving contact bridge 3210 and the static contact 311 form a main contact. The yoke 3205 covers the top port of the iron core sleeve 3201, and the copper tube 3206 is welded to the yoke 3205. The moving iron core 3202 is movably installed inside the iron core sleeve 3201 and is disposed opposite to the yoke 3205. One end of the driving module 3204 passes through the yoke 3205 and is connected to the moving iron core 3202. The other end of the driving module 3204 is in limit cooperation with the yoke 3205 and can drive the moving contact bridge 3210 to switch the opening and closing states with the static contact 311. The part of the contact mechanism 32 above the yoke 3205 at least includes the auxiliary moving contact module 3212 and the moving contact bridge 3210. It should be noted that the electromagnetic system 4 of this embodiment is a prior art, usually including a coil bobbin and a coil sleeved on the coil bobbin. The iron core sleeve 3201 of the contact system 3 is riveted and fixed in the axial hole of the coil bobbin. When the coil is energized, the moving iron core 3202 moves upward to be attracted to the yoke 3205. When the coil is de-energized, the main spring 3203 drives the moving iron core 3202 to move downward to be repelled from the yoke 3205.

[0061] In particular, as Figure 3 , Figure 7 and Figure 8As shown in the figure, the auxiliary moving contact module 3212 of this embodiment includes a mounting bracket, a reed 32123 (also known as the auxiliary moving contact) limit-mounted on the mounting bracket, and a push rod 32124 movably arranged on the mounting bracket. When the reed 32122 is closed with the auxiliary static contact 312, the auxiliary circuit is turned on. When the reed 32122 is disconnected from the auxiliary static contact 312, the auxiliary circuit is turned off. The mounting bracket is fixed on the yoke 3205. An activity space for the moving contact bridge 3210 to move is formed between the mounting bracket and the yoke 3205. The driving module 3204 can drive the push rod 32124 to push the reed 32123 to connect and disconnect the two auxiliary static contacts 312. In the contact mechanism, contact system and DC contactor of this embodiment, the yoke 3205 serves as the motion reference of the driving module 3204. The yoke 3205 limits the upper position of the driving module 3204 through the limit cooperation of the moving iron core 3202 linked with the driving module 3204 through the yoke 3205, and the yoke 3205 also limits the lower position of the driving module 3204. The auxiliary moving contact module 3212 is fixed on the yoke 3205 through the mounting bracket, realizing interlocking limit with the driving module 3204. The mechanical parameters of the auxiliary moving contact module 3212 can be adjusted and fixed before welding and sealing, ensuring the working reliability of the auxiliary moving contact module 3212 after welding. At the same time, the height of the auxiliary moving contact module 3212 is determined by the height of the mounting bracket fixed on the yoke 3205. The dimension chain is single and the superimposed tolerance is small, reducing the risk of excessive or insufficient pushing caused by the influence of tolerance on the movement stroke of the driving module 3204.

[0062] As Figure 8 and Figure 9 As shown in the figure, the mounting bracket includes a mounting seat 32122 as the top of the mounting bracket and an outer bracket 32121 as the bottom of the mounting bracket and fixedly connected between the mounting seat 32122 and the yoke 3205. The mounting seat 32122 is made of insulating material. The mounting seat 32122 is provided with a push rod groove 321228 that slidably cooperates with the push rod 32124 and a reed groove 321229 that cooperates with the reed 32123. The push rod groove 321228 communicates the activity space with the reed groove 321229. Specifically, the side wall of the mounting seat 32122 at the top of the mounting bracket is attached to the inner side wall of the ceramic housing 31. A sealed space is formed between the top wall and the side wall of the ceramic housing 31 and the mounting seat 32122. The reed 32123 of the contact mechanism 32 is located in the sealed space. The push rod 32124 of the contact mechanism 32 is slidably inserted into the push rod groove 321228 of the mounting seat 32122 for communicating the sealed space with the activity space. The mounting seat 32122 and the push rod 32124 thereon form a closed sealed space for accommodating the reed 32123 with the ceramic housing 31, effectively preventing the scattered arc from invading the signal circuit.

[0063] AsFigure 8 and Figure 9 As shown in Figure 9 , two reed grooves 321229 are provided on the mounting base 32122 on both sides of the push rod groove 321228; the auxiliary moving contact module 3212 includes two reeds 32123 respectively installed in the two reed grooves 321229, one of the reeds 32123 serves as a static reed, and the other reed 32123 serves as a moving reed. The two reeds 32123 are respectively electrically connected to the two auxiliary static contacts 312, and the front ends of the two reeds 32123 are stacked and spaced above the push rod 32124. When the push rod 32124 moves upward, it pushes the reed 32123 serving as the moving reed to make the front ends of the two reeds 32123 contact, so that the two auxiliary static contacts 312 are connected; when the push rod 32124 moves downward, the reed 32123 serving as the moving reed returns to its original state, and the front ends of the two reeds 32123 are disconnected, so that the two auxiliary static contacts 312 are disconnected. In this embodiment, by the contact or disconnection between the two reeds 32123 respectively connected to the two auxiliary static contacts 312, the on-off state between the two auxiliary static contacts 312 is switched. Of course, as other embodiments, it may also be to provide a reed 32123, and its two ends are respectively arranged opposite to the two auxiliary static contacts 312 at intervals, and the on-off state between the two auxiliary static contacts 312 is switched by the contact or disconnection between the two ends of the reed 32123 and the two auxiliary static contacts 312.

[0064] As Figures 16 - 18 shown in Figures 16 - 18 , the reed 32123 is a sheet-like structure made of an elastic alloy with good conductivity. A perforation 321231 for the auxiliary static contact 312 to pass through is provided at the rear end of the reed 32123, and wing pieces 321232 extend from the rear end of the reed 32123 to both sides. The rear end of the reed 32123 is also folded back to form a spring piece 321233 for elastically abutting against the auxiliary static contact 312.

[0065] As Figures 13 - 15As shown, the push rod groove 321228 of the mounting base 32122 includes a first sunk platform 321221 provided in the middle of the mounting base 32122 and a second through hole 321222 provided in the middle of the first sunk platform 321221. The reed groove 321229 of the mounting base 32122 includes an outer sunk groove 321224 provided at the end of the mounting base 32122, two side slots 321225 provided on both sides of the outer sunk groove 321224 and used for cooperating with the fin 321232, and an inner sunk groove 321223 communicating between the outer sunk groove 321224 and the first sunk platform 321221 of the push rod groove 321228. A support rib 321227 for supporting the front end of the reed 32123 is provided in the inner sunk groove 321223. The front end of the reed 32123 is located in the inner sunk groove 321223 and placed on the support rib 321227. The fin 321232 of the reed 32123 is inserted into the side slot 321225, and the elastic piece 321233 of the reed 32123 is located in the outer sunk groove 321224.

[0066] A solution for the connection structure between the reed 32123 and the auxiliary static contact 312 is as Figures 16 - 18 shown in Embodiment 1 as Figure 21 and Figure 22 shown in Embodiment 2 as Figure 28 and Figure 33 shown in Embodiment 3. The rear end of the reed 32123 and the elastic piece 321233 form a U shape. There are various connection methods between the reed 32123 and the auxiliary static contact 312. One is as Figure 3 shown in Embodiment 1 as Figure 28 and shown in Embodiment 3 as Figure 21 where the elastic piece 321233 of the reed 32123 is installed downward, and one end of the auxiliary static contact 312 passes through the through hole 321231 and abuts against the inner side of the elastic piece 321233; another is as Figure 21 shown in Embodiment 2 where the elastic piece 321233 of the left reed 32123 is installed upward, and one end of the left auxiliary static contact 312 abuts against the outer side of the elastic piece 321233; still another is as

[0067] shown in Embodiment 2 where the elastic piece 321233 of the right reed 32123 is installed downward, and one end of the right auxiliary static contact 312 abuts against the rear end of the right reed 32123. Figures 38 - 40 shown in Embodiment 4 of another solution for the connection structure between the reed 32123 and the auxiliary static contact 312. The rear end of the reed 32123 and the elastic piece 321233 form a V shape, and the end of the elastic piece 321233 has a hook 321234 bent inward. As Figure 37As shown, the elastic piece 321233 of the reed 32123 is installed downward, and one end of the auxiliary static contact 312 passes through the perforation 321231 and abuts against the hook 321234 at the end of the elastic piece 321233. This design improves the flexibility of the elastic piece 321233, and the hook 321234 at the end of the elastic piece 321233 provides a greater contact pressure, further improving the connection reliability between the reed 32123 and the auxiliary static contact 312. In this embodiment, the outer sinking groove 321224 corresponding to the reed 32123 sinks further to make way.

[0068] As Figure 19 and Figure 20 shown, the push rod 32124 is made of an insulating material and includes a limiting plate 31244 slidably disposed in the first sinking platform 321221 of the mounting seat 32122, a bump 321241 disposed on the top surface of the limiting plate 31244 and used to push the reed 32123, and a cylinder 321242 disposed on the bottom surface of the limiting plate 31244 and slidably engaged with the second through hole 321222 of the mounting seat 32122. A second sinking platform 231243 with an inclined surface is provided at the bottom end of the cylinder 321242.

[0069] There are at least three solutions for the specific structure of the mounting frame. The first solution is as Figures 9 - 15 shown in Embodiment 1. The outer bracket 32121 of the mounting frame includes two U-shaped frames 321212 made of metal and opening upward. The tops of the two U-shaped frames 321212 are respectively clamped and fixed to both ends of the mounting seat 32122. Bracket slots 321226 are provided at both ends of the mounting seat 32122, and tongue pieces 321215 cooperating with the bracket slots 321226 are provided at the tops of the U-shaped frames 321212. Convex bracts 321216 are provided on the tongue pieces 321215 to prevent the tongue pieces 321215 from easily disengaging from the bracket slots 321226. Specifically, two bending wing pieces 321213 are respectively provided on both sides of the two side plates of the U-shaped frame 321212 to increase the strength; steps 321214 are provided at the tops of both side plates of the U-shaped frame 321212, and the tongue piece 321215 is formed by the middle part of the top surface of the step 321214 extending upward. The mounting frame in this embodiment is assembled by the mounting seat 32122 made of an insulating material and the outer bracket 32121 made of a metal material, reducing the insulating material components of the mounting frame, reducing gas pollution, and having high structural stability.

[0070] In this embodiment, as Figure 6 and Figure 12As shown, each bottom plate of the U-shaped frame 321212 of the outer bracket 32121 is provided with a fixing groove 321211, and the yoke 3205 is provided with a fixing protrusion 32051 fixedly inserted into the fixing groove 321211. Preferably, the fixing groove 321211 is a circular through groove, and the fixing protrusion 32051 is a circular convex hull.

[0071] The second solution is as Figures 24 - 27 shown in Embodiment 2, the outer bracket 32121 includes two vertical plates 321219, and the two vertical plates 321219 are respectively integrally connected to both ends of the mounting seat 32122 of the mounting bracket. The mounting bracket in this embodiment is an integrally formed structure made of insulating material, with a simple structure and convenient for production and assembly. In this embodiment, as Figure 22 and Figure 27 shown, each of the two vertical plates 321219 of the outer bracket 32121 is provided with a fixing groove 321211, and the yoke 3205 is provided with a fixing protrusion 32051 fixedly inserted into the fixing groove 321211. Preferably, the fixing groove 321211 is a square groove, and the fixing protrusion 32051 is a square convex block.

[0072] The third solution is as Figures 31 - 36 shown in Embodiment 3, which is different from the first solution in that the outer bracket 32121 of the mounting bracket further includes a connecting portion 321217. The middle of the connecting portion 321217 is provided with a first through hole 321218 for the driving module 3204 to pass through. The two ends of the connecting portion 321217 are respectively integrally connected to the bottom plates of the two U-shaped frames 321212. That is, the outer bracket 32121 in this embodiment is an integrally formed structure, making the structure of the outer bracket 32121 more stable.

[0073] As Figures 4 - 6 shown, the contact mechanism 32 includes a fixing bracket 3207 fixed to the other end of the driving module 3204 and used to drive the push rod 32124, a restoring spring 3208 that provides an elastic restoring force for the lower magnetic sheet 3209, a lower magnetic sheet 3209 and an upper magnetic sheet 3211 arranged oppositely. The fixing bracket 3207 is an inverted U-shaped structure. The upper magnetic sheet 3211 is riveted and fixed to the inner side of the top edge of the fixing bracket 3207. The lower magnetic sheet 3209 is a U-shaped structure with an opening opposite to the upper magnetic sheet 3211. The middle of the moving contact bridge 3210 is installed on the inner side of the bottom edge of the lower magnetic sheet 3209. The two ends of the moving contact bridge 3210 extend out of the moving space and are respectively matched with the two static contacts 311, so that the movement direction of the auxiliary moving contact module 3212 away from the arc generated between the moving contact bridge 3210 and the static contacts 311 is reduced, and gas pollution is reduced.

[0074] As Figures 41 - 42As shown in the figure, the driving module 3204 includes a metal rod 32041, an insulating seat 32042 for limiting and cooperating with the yoke 3205, and two symmetrically arranged supporting washers 32043. One end of the metal rod 32041 and one end of the supporting washer 32043 are jointly injection-molded into the insulating seat 32042 to form the other end of the driving module 3204. The metal rod 32041 is located in the middle of the insulating seat 32042 and between the two supporting washers 32043. As Figure 5 shown, the two sides of the fixing bracket 3207 are provided with insertion holes for inserting and cooperating with the other ends of the supporting washers 32043. One end of the restoring spring 3208 is connected to the outer side of the bottom edge of the lower magnetic plate 3209, and the other end of the restoring spring 3208 is connected to the insulating seat 32042. The structures of the lower magnetic plate 3209 and the insulating seat 32042 for connecting the restoring spring 3208 can be structures such as a plane, a protrusion, a groove, etc.

[0075] As Figure 3 and Figure 5 shown, in the operation process of the DC contactor of this embodiment, when the coil of the electromagnetic system 4 is energized, the moving iron core 3202 moves upward against the pressure of the main spring 3203 after being excited. The driving module 3204 moves upward with the moving iron core 3202, causing the restoring spring 3208 to press the lower magnetic plate 3209 and the moving contact bridge 3210, so that the moving contact bridge 3210 is closed with the static contact 311. Due to the existence of the over-travel, the moving iron core 3202 further moves upward to be attracted to the yoke 3205. The moving iron core 3202 drives the driving module 3204 and the fixing bracket 3207 fixed on the driving module 3204 to move upward. The upper magnetic plate 3211 moves upward with the fixing bracket 3207 to be disconnected from the lower magnetic plate 3209. At the same time, the fixing bracket 3207 pushes the reed 32123 upward through the push rod 32124 to close the two reeds 32123, so that the two auxiliary static contacts 312 are connected, realizing the output of the closed state of the current main contact (the moving contact bridge 3210 and the static contact 311) through the auxiliary moving contact module 3212 electrical circuit.

[0076] It should be noted that in the description of the present invention, the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in the usual placement during use. It is only for the convenience of description and does not indicate that the device or element referred to must have a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating relative importance.

[0077] The above content is a further detailed description of the present utility model creation in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present utility model creation is only limited to these descriptions. For those of ordinary skill in the technical field to which the present utility model creation pertains, without departing from the concept of the present utility model creation, several simple deductions or substitutions can still be made, and all should be regarded as belonging to the protection scope of the present utility model creation.

Claims

1. The contact mechanism includes a moving iron core (3202), a main spring (3203) that provides an elastic reset force for the moving iron core (3202), a driving module (3204), a magnetic yoke (3205), a moving contact bridge (3210), and an auxiliary moving contact module (3212). The moving iron core (3202) is disposed opposite to the magnetic yoke (3205). One end of the driving module (3204) passes through the magnetic yoke (3205) and is connected to the moving iron core (3202). The other end of the driving module (3204) is in limit cooperation with the magnetic yoke (3205) and drives the moving contact bridge (3210) to switch the opening and closing states with the static contact (311). It is characterized in that: The auxiliary moving contact module (3212) includes a mounting bracket, a reed (32123) limit-mounted on the mounting bracket, and a push rod (32124) movably arranged on the mounting bracket. The mounting bracket is fixed on the yoke (3205). An activity space for the moving contact bridge (3210) to move is formed between the mounting bracket and the yoke (3205). The driving module (3204) can drive the push rod (32124) to push the reed (32123) to connect and disconnect two auxiliary static contacts (312).

2. The contact mechanism according to claim 1, characterized in that: The mounting bracket includes a mounting base (32122) serving as the top of the mounting bracket and an outer bracket (32121) serving as the bottom of the mounting bracket and fixedly connected between the mounting base (32122) and the yoke (3205). The mounting base (32122) is provided with a push rod groove (321228) slidably matched with the push rod (32124) and a reed groove (321229) matched with the reed (32123). The push rod groove (321228) communicates the activity space with the reed groove (321229).

3. The contact mechanism according to claim 2, characterized in that: Two reed grooves (321229) are provided on the mounting base (32122) on both sides of the push rod groove (321228); the auxiliary moving contact module (3212) includes two reeds (32123) respectively installed in the two reed grooves (321229). The two reeds (32123) are respectively electrically connected to the two auxiliary static contacts (312). The front ends of the two reeds (32123) are spaced apart in the vertical direction and arranged above the push rod (32124).

4. The contact mechanism according to claim 3, wherein: The reed (32123) is of a sheet structure. A perforation (321231) is provided at the rear end of the reed (32123), and wing pieces (321232) extend outwards from both sides of the rear end of the reed (32123). The rear end of the reed (32123) also folds back to form an auxiliary static contact spring piece (321233). The rear end of the reed (32123) and the spring piece (321233) form a U shape; alternatively, the rear end of the reed (32123) and the spring piece (321233) form a V shape, and the end of the spring piece (321233) has a hook (321234) bent inwards.

5. The contact mechanism according to claim 4, wherein: The reed groove (321229) includes an outer sink groove (321224) provided at the end of the mounting base (32122), two side slots (321225) provided on both sides of the outer sink groove (321224) and used for cooperating with the wing pieces (321232), and an inner sink groove (321223) communicating between the outer sink groove (321224) and the push rod groove (321228).

6. The contact mechanism according to claim 2, characterized in that: The push rod groove (321228) includes a first sunk platform (321221) provided in the middle of the mounting base (32122) and a second through hole (321222) provided in the middle of the first sunk platform (321221); the push rod (32124) includes a limiting plate (31244) slidably arranged in the first sunk platform (321221), a bump (321241) provided on the top surface of the limiting plate (31244) and used to push the reed (32123), and a cylinder (321242) provided on the bottom surface of the limiting plate (31244) and slidably matched with the second through hole (321222).

7. The contact mechanism according to claim 2, characterized in that: The outer bracket (32121) includes two vertical plates (321219), and the two vertical plates (321219) are integrally connected to both ends of the mounting base (32122) respectively.

8. The contact mechanism according to claim 2, wherein: The outer bracket (32121) includes two U-shaped frames (321212) made of metal and with openings facing upward, and the tops of the two U-shaped frames (321212) are respectively clamped and fixed to both ends of the mounting base (32122).

9. The contact mechanism according to claim 8, characterized in that: Both ends of the mounting base (32122) are provided with bracket slots (321226), the top of the U-shaped frame (321212) is provided with a tongue piece (321215) matched with the bracket slot (321226), and the tongue piece (321215) is provided with a convex bud (321216).

10. The contact mechanism according to claim 8, characterized in that: The outer bracket (32121) further includes a connecting portion (321217), a first through hole (321218) for the driving module (3204) to pass through is provided in the middle of the connecting portion (321217), and both ends of the connecting portion (321217) are integrally connected to the bottom plates of the two U-shaped frames (321212) respectively.

11. The contact mechanism according to claim 2, characterized in that: The outer bracket (32121) is provided with a fixing groove (321211), and the yoke (3205) is provided with a fixing protrusion (32051) fixedly inserted into the fixing groove (321211).

12. The contact mechanism according to claim 1, wherein: It further includes a fixing bracket (3207) fixed to the other end of the driving module (3204) and used to drive the push rod (32124), a restoring spring (3208) for providing an elastic restoring force to the lower magnetic sheet (3209), a lower magnetic sheet (3209) and an upper magnetic sheet (3211) arranged oppositely, the upper magnetic sheet (3211) is fixed on the fixing bracket (3207), the middle of the moving contact bridge (3210) is mounted on the lower magnetic sheet (3209), and both ends of the moving contact bridge (3210) extend out of the moving space and are respectively matched with two static contacts (311).

13. The contact mechanism according to claim 12, characterized in that: The driving module (3204) includes a metal rod (32041), an insulating seat (32042) for limiting and cooperating with the yoke (3205), and two support gaskets (32043). One end of the metal rod (32041) and one end of the support gasket (32043) are integrally injection-molded into the insulating seat (32042). The metal rod (32041) is located in the middle of the insulating seat (32042) and between the two support gaskets (32043). The fixing bracket (3207) is provided with a socket hole for plugging and cooperating with the other end of the support gasket (32043). One end of the restoring spring (3208) is connected to the lower magnetic sheet (3209), and the other end of the restoring spring (3208) is connected to the insulating seat (32042).

14. Contact system, characterized in that: It includes a ceramic housing (31), an arc extinguishing component (33), and the contact mechanism (32) according to any one of claims 1-13. The ceramic housing (31) is mounted on the yoke (3205) of the contact mechanism (32). The part of the contact mechanism (32) located above the yoke (3205) is located inside the ceramic housing (31). The part of the contact mechanism (32) located above the yoke (3205) at least includes an auxiliary moving contact module (3212) and a moving contact bridge (3210). The arc extinguishing component (33) is mounted on the outer side wall of the ceramic housing (31).

15. The contact system according to claim 14, characterized in that: The side wall of the mounting seat (32122) at the top of the mounting frame of the auxiliary moving contact module (3212) is arranged in close fit with the inner side wall of the ceramic housing (31). A sealed space is formed between the top wall and the side wall of the ceramic housing (31) and the mounting seat (32122). The reed (32123) of the contact mechanism (32) is located in the sealed space. The push rod (32124) of the contact mechanism (32) is slidably inserted into the push rod groove (321228) of the mounting seat (32122) for communicating the sealed space with the movable space.

16. DC contactor, characterized in that: It includes a mutually buckled outer shell (1) and a bottom cover (6), a plug (2), an electromagnetic system (4) installed inside the outer shell (1), a control circuit (5), and the contact system (3) according to claim 14 or 15. The contact system (3) is installed on the electromagnetic system (4). The two auxiliary static contacts (312) of the contact system (3) are electrically connected to the control circuit (5) respectively. The plug (2) is inserted into the jack on the outer shell (1) and is electrically connected to the control circuit (5).

Images