Contact mechanism and direct-current contactor

Abstract

In a contact mechanism and a direct-current contactor of the present invention, a magnetic yoke serves as a motion reference for a drive module; the magnetic yoke performs upper limiting on the drive module by means of a limiting fit between the magnetic yoke and a movable iron core linked to the drive module, and the magnetic yoke also performs lower limiting on the drive module; an auxiliary movable contact module is fixed to the magnetic yoke by means of a mounting frame, and achieves interlocking and limiting with the drive module, such that the adjustment and fixation of mechanical parameters of the auxiliary movable contact module can be completed before welding and sealing, thereby ensuring the operational reliability of the auxiliary movable contact module after welding; moreover, the height of the auxiliary movable contact module is determined by the height of the mounting frame fixed to the magnetic yoke, dimensional chains are single, and stacked-up tolerances are small, thereby reducing the risk of excessive or insufficient pushing caused by a movement stroke of the drive module being affected by tolerances.

Description

Contact mechanism and DC contactor

[0001] The present application claims priority to Chinese Patent Application No. 202411310240.1 filed on September 19, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the field of low-voltage electrical apparatus, in particular to a contact mechanism and a DC contactor. BACKGROUND

[0003] DC contactors are widely used in charging piles, vehicle-mounted power management, energy storage, and other fields. Based on the continuous upgrading of new energy control systems, the working state of key control components needs to be continuously monitored to ensure the normal and reliable operation of the system. The contactor, as the main switch and control component of the new energy system, directly determines the reliable operation of the system. Therefore, the system needs to feed back the signal of the switching state of the contactor to ensure the current working state of the contact bridge.

[0004] The existing DC contactors generally adopt the following schemes:

[0005] A micro switch is arranged in the ceramic contact chamber, and the movement of the contact system drives the micro switch to output the current contact closing state. However, the signal stability of this scheme is relatively poor, which affects the information feedback of the system and has potential failure risks. Long-term application practice has proved that the reliability is weak.

[0006] Alternatively, a mechanical contact is arranged in the ceramic contact chamber, and the movement of the contact system drives the mechanical contact to output the current contact opening and closing state. This scheme has gradually become the mainstream of the current auxiliary contact system. For example, CN202210392775.2 discloses an auxiliary contact structure, which arranges a mechanical reed on an insulating seat and places it in a ceramic seat, arranges an insulating push rod on a movement driving module, and drives the mechanical reed placed on the insulating seat by the movement driving module to output the current working state of the contactor. For example, CN202111109082.X and CN201610947762.1 disclose an auxiliary contact structure, which arranges a mechanical reed on a movement driving module and ensures electrical insulation with the main circuit, and drives the mechanical reed to close with an auxiliary point rod arranged on a ceramic seat by the movement of the movement driving module to output the working state. For example, CN202211139451.4 discloses an auxiliary contact structure, which focuses on the interlocking of the driving mechanism and the moving contact piece instead of the movement driving module, avoiding damage caused by excessive pushing.

[0007] However, in-depth study of the above schemes has found the following problems:

[0008] 1. A number of plastic structural components are placed in the ceramic cavity, especially in the direction of the contact arc movement. It is acceptable to operate below 1000VDC, but when the operating voltage exceeds 1000VDC or even 1500VDC, the plastic components are damaged under strong arc erosion, affecting the structural stability. At the same time, it will release gas and pollute the pure gas environment in the contact cavity.

[0009] 2. Further analysis of the motion dimension chain reveals that the dimension reference of the motion drive module is the magnetic yoke. However, the above solutions usually place the auxiliary contact system on the ceramic housing or other components, resulting in an excessively long dimension chain between the auxiliary contact system and the magnetic yoke. The excessive tolerance of the superposition of the dimensions of several parts will cause the motion stroke of the motion drive module to be affected by the tolerance, resulting in the risk of insufficient pushing or pushing during the process.

[0010] 3. The auxiliary contact system of the above scheme will be directly exposed in the ceramic contact cavity to some extent. When the arc intensity is large, the strong arc movement will fill the entire ceramic contact cavity. The exposed auxiliary contact system may short circuit or even burn out under strong arc.

[0011] 4. The auxiliary contact system and motion drive module components in the above scheme are not mechanically interlocked. The mechanical parameters of the auxiliary contact system cannot be directly tested and fixed. After the ceramic contact chamber is welded, random changes in the dimensional 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. Summary of the Invention

[0012] The purpose of this invention is to overcome at least one defect of the prior art and to provide a contact mechanism and a DC contactor.

[0013] To achieve the above objectives, the present invention adopts the following technical solution:

[0014] The contact mechanism includes a moving iron core, a main spring providing elastic restoring force to the moving iron core, a drive module, a magnetic yoke, a moving contact bridge, and an auxiliary moving contact module. The moving iron core is arranged opposite to the magnetic yoke. One end of the drive module passes through the magnetic yoke and is connected to the moving iron core. The other end of the drive module is limited by the magnetic yoke and drives the moving contact bridge to switch between open and closed states with the stationary contact. The auxiliary moving contact module includes a mounting frame, a spring plate limited by the mounting frame, and a push rod movably arranged on the mounting frame. The mounting frame is fixed to the magnetic yoke, and the mounting frame and the magnetic yoke form an active space for the moving contact bridge to move. The drive module can drive the push rod, causing the push rod to push the spring plate to connect and disconnect the two auxiliary stationary contacts.

[0015] Optionally, the mounting frame comprises a mounting seat as a top of the mounting frame and an outer support as a bottom of the mounting frame and fixedly connected between the mounting seat and the magnetic yoke, the mounting seat is provided with a push rod slot for slidingly matching with the push rod and a reed slot for matching with the reed, and the push rod slot is communicated with the active space and the reed slot.

[0016] Optionally, the mounting seat is provided with two reed slots on both sides of the push rod slot; the auxiliary movable contact module comprises two reeds respectively installed in the two reed slots, the two reeds are respectively electrically connected with two auxiliary stationary contacts, and front ends of the two reeds are vertically spaced apart and arranged above the push rod.

[0017] Optionally, the reed is in a sheet structure, the rear end of the reed is provided with a through hole, wings are extended from both sides of the rear end of the reed, and the rear end of the reed is further folded back to form an auxiliary stationary contact spring piece.

[0018] The rear end of the reed and the spring piece are in a U shape; or the rear end of the reed and the spring piece are in a V shape, and the end of the spring piece has an inwardly bent hook.

[0019] Optionally, the reed slot comprises an outer sunken groove arranged at an end of the mounting seat, two side insertion grooves arranged at both sides of the outer sunken groove and used for matching with the wings, and an inner sunken groove communicated between the outer sunken groove and the push rod slot.

[0020] Optionally, the push rod slot comprises a first sunken table arranged at a middle portion of the mounting seat and a second through hole arranged at a middle portion of the first sunken table; the push rod comprises a limiting plate slidingly arranged in the first sunken table, a convex point arranged on a top surface of the limiting plate and used for pushing the reed, and a cylinder arranged on a bottom surface of the limiting plate and slidingly matched with the second through hole.

[0021] Optionally, the outer support comprises two vertical plates, and the two vertical plates are respectively integrally connected with both ends of the mounting seat.

[0022] Optionally, the outer support comprises two U-shaped frames made of metal and having openings facing upwards, and the top portions of the two U-shaped frames are respectively clamped and fixed with both ends of the mounting seat.

[0023] Optionally, both ends of the mounting seat are provided with support insertion grooves, the top portion of the U-shaped frame is provided with a tongue piece matched with the support insertion grooves, and the tongue piece is provided with a convex petal.

[0024] Optionally, the outer support further comprises a connecting portion, a first through hole for the driving module to pass through is arranged at a middle portion of the connecting portion, and both ends of the connecting portion are respectively integrally connected with bottom plates of the two U-shaped frames.

[0025] Optionally, the outer support is provided with a fixing groove, and the magnetic yoke is provided with a fixing protrusion inserted into the fixing groove.

[0026] Optionally, it further comprises a fixed support fixed on the other end of the drive module and used for driving the push rod, a restoring spring providing elastic restoring force for the lower magnetic sheet, and the oppositely arranged lower magnetic sheet and upper magnetic sheet, the upper magnetic sheet being fixed on the fixed support, the middle part of the movable contact bridge being mounted on the lower magnetic sheet, and the two ends of the movable contact bridge extending out of the active space and respectively cooperating with the two static contactors.

[0027] Optionally, the drive module comprises a metal rod, an insulating seat used for limiting cooperation with the magnetic yoke, and two supporting washers, one end of the metal rod and one end of the supporting washer being jointly injection molded into the insulating seat, the metal rod being located in the middle part of the insulating seat and between the two supporting washers; the fixed support is provided with a plug-in hole for plug-in cooperation with the other end of the supporting washer; one end of the restoring spring is connected to the lower magnetic sheet, and the other end of the restoring spring is connected to the insulating seat.

[0028] The direct current contactor comprises an electromagnetic system and a contact system, the contact system being mounted on the electromagnetic system, the contact system comprising a ceramic housing, an arc extinguishing assembly, and the contact mechanism of any one of the preceding claims, the ceramic housing being mounted on the magnetic yoke of the contact mechanism, the part of the contact mechanism above the magnetic yoke being located in the ceramic housing, the part of the contact mechanism above the magnetic yoke at least comprising the auxiliary movable contact module and the movable contact bridge, and the arc extinguishing assembly being attached to the outer sidewall of the ceramic housing.

[0029] Optionally, the sidewall of the mounting seat at the top of the auxiliary movable contact module mounting frame is arranged in close contact with the inner sidewall of the ceramic housing, the top wall and the sidewall of the ceramic housing and the mounting seat form a closed space, the reed of the contact mechanism is located in the closed space, and the push rod of the contact mechanism is slidingly mounted into the push rod slot of the closed space for connecting the closed space and the active space.

[0030] Optionally, it comprises a housing and a bottom cover that are buckled together, a plug, an electromagnetic system mounted in the housing, a control circuit, and the contact system, the two auxiliary static contactors of the contact system being electrically connected to the control circuit, and the plug being mounted into the plug hole on the housing and being electrically connected to the control circuit.

[0031] The contact mechanism and the DC contactor of the application have the following advantages: the magnetic yoke is used as the movement reference of the driving module, the upper limit of the driving module is realized by the magnetic yoke and the dynamic core limiting cooperation of the driving module linkage connection, and the magnetic yoke also limits the lower part of the driving module; the auxiliary moving contact module is fixed on the magnetic yoke through the mounting frame, and the interlocking limiting of the auxiliary moving contact module and the driving module is realized, so that the mechanical parameter adjustment and fixation of the auxiliary moving contact module can be completed before welding and sealing, and the working reliability of the auxiliary moving contact module after welding is ensured; meanwhile, the height of the auxiliary moving contact module is determined by the height of the mounting frame fixed on the magnetic yoke, the size chain is single, the superimposed tolerance is small, and the risk of excessive or insufficient pushing caused by the movement stroke of the driving module affected by the tolerance is reduced.

[0032] In addition, the mounting seat, the push rod thereon and the ceramic cover form a closed space for accommodating the reed, effectively preventing the invading of the scattered arc into the signal circuit.

[0033] In addition, the two ends of the moving contact bridge extend into the activity space and are matched with the two static contacts respectively, so that the auxiliary moving contact module is away from the movement direction of the arc generated between the moving contact bridge and the static contact, and the gas pollution is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0034] Fig. 1 is an exploded view of the contactor of the application;

[0035] Fig. 2 is a structural schematic view of the contact system of the application;

[0036] Fig. 3 is a sectional view of the contact system of the first embodiment of the application;

[0037] Fig. 4 is a view of the contact mechanism of the first embodiment of the application;

[0038] Fig. 5 is a sectional view of the contact mechanism of the first embodiment of the application;

[0039] Fig. 6 is a perspective view of the contact mechanism of the first embodiment of the application;

[0040] Figs. 7-9 are structural schematic views of the auxiliary moving contact module of the first embodiment of the application;

[0041] Figs. 10-12 are structural schematic views of the outer support of the first embodiment of the application;

[0042] Figs. 13-15 are structural schematic views of the mounting seat of the first embodiment of the application;

[0043] Figs. 16-18 are structural schematic views of the reed of the first embodiment of the application;

[0044] Figs. 19-20 are structural schematic views of the push rod of the application;

[0045] Fig. 21 is a sectional view of the contact system of the second embodiment of the application;

[0046] Figure 22 is a cross-sectional view of the contact mechanism of Embodiment 2 of the present invention;

[0047] Figure 23 is a perspective view of the contact mechanism of Embodiment 2 of the present invention;

[0048] Figure 24 is a structural schematic diagram of the auxiliary moving contact module in Embodiment 2 of the present invention;

[0049] Figures 25-27 are schematic diagrams of the mounting bracket in Embodiment 2 of the present invention;

[0050] Figure 28 is a cross-sectional view of the contact system of Embodiment 3 of the present invention;

[0051] Figure 29 is a cross-sectional view of the contact mechanism of Embodiment 3 of the present invention;

[0052] Figure 30 is a perspective view of the contact mechanism of Embodiment 3 of the present invention;

[0053] Figures 31-33 are schematic diagrams of the auxiliary moving contact module in Embodiment 3 of the present invention;

[0054] Figures 34-36 are schematic diagrams of the external support structure in Embodiment 3 of the present invention;

[0055] Figure 37 is a cross-sectional view of the contact system of Embodiment 4 of the present invention;

[0056] Figures 38-40 are schematic diagrams of the structure of the four springs in an embodiment of the present invention;

[0057] Figures 41-42 are schematic diagrams of the structure of the driving module created in this invention.

[0058] Housing 1; plug 2; contact system 3; ceramic cover 31; static contact 311; auxiliary static contact 312; contact mechanism 32; iron core sleeve 3201; moving iron core 3202; main spring 3203; drive module 3204; metal rod 32041; insulating seat 32042; support gasket 32043; magnetic yoke 3205; fixed protrusion 32051; copper tube 3206; fixed support 3207; recovery spring 3208; lower magnetic sheet 3209; moving contact bridge 3210; upper magnetic sheet 3211; auxiliary moving contact module 3212; outer support 32121; fixed slot 321211; U-shaped frame 321212; bent wing 321213; step 321214; tongue 321215; convex petal 321216; connecting part 321217; first through hole 321218; vertical plate 321219; mounting seat 32122; first counterbore 321221; second through hole 321222; inner counterbore 321223; outer counterbore 321224; side insertion slot 321225; support insertion slot 321226; support rib 321227; push rod slot 321228; reed slot 321229; reed 32123; perforation 321231; wing 321232; spring 321233; bent hook 321234; push rod 32124; convex point 321241; cylinder 321242; second counterbore 231243; limiting plate 31244; arc extinguishing assembly 33; electromagnetic system 4; control circuit 5; bottom cover 6. DETAILED DESCRIPTION

[0059] The following examples, given in conjunction with the accompanying drawings, further illustrate the contact mechanism, contact system and DC contactor of the present application. The contact mechanism, contact system and DC contactor of the present application are not limited to the examples described below.

[0060] As shown in FIG. 1-2, the direct current contactor of the embodiment comprises a buckled housing 1 and a bottom cover 6, a plug 2, an electromagnetic system 4 installed in the housing 1, a control circuit 5 and a contact system 3 installed on the electromagnetic system 4, the contact system 3 comprises a ceramic cover 31, an arc extinguishing assembly 33 and a contact mechanism 32, the ceramic cover 31 is installed on a magnetic yoke 3205 of the contact mechanism 32 through an iron support at the bottom of the ceramic cover 31, the part of the contact mechanism 32 above the magnetic yoke 3205 is located in the ceramic cover 31, and the arc extinguishing assembly 33 is attached to the outer sidewall of the ceramic cover 31. Two static contacts 311 distributed left and right and two auxiliary static contact points 312 distributed front and back are arranged on the top wall of the ceramic cover 31, the two static contacts 311 are symmetrically arranged, one end of the static contact 311 penetrates the top wall of the ceramic cover 31 and extends into the ceramic cover 31, the auxiliary static contact point 312 is a rod-shaped structure penetrating the ceramic cover 31, the part of the auxiliary static contact point 312 outside the ceramic cover 31 is used for electrical connection with the control circuit 5, and the part of the auxiliary static contact point 312 inside the ceramic cover 31 is used for electrical connection with an auxiliary moving contact point, the two auxiliary static contact points 312 are symmetrically arranged, the parts of the two auxiliary static contact points 312 outside the ceramic cover 31 are respectively electrically connected with the control circuit 5, and the plug 2 is installed in a plug hole on the housing 1 and electrically connected with the control circuit 5. It should be noted that the plug 2 of the embodiment is a standard part, the principle of the control circuit 5 is the prior art, when the two auxiliary static contact points 312 are connected, the control circuit 5 feeds back a signal to an external system through the plug 2, when the two auxiliary static contact points 312 are disconnected, the control circuit 5 stops feeding back the signal to the external system, so that the on-off state between the two auxiliary static contact points 312 (i.e. the on-off state of the auxiliary circuit) can be monitored in real time, since the on-off state between the two auxiliary static contact points 312 is set to be consistent with the switching state of the contactor (i.e. the opening and closing state of the main contact), the control circuit 5 realizes signal feedback of the switching state of the contactor through the switching of the on-off state between the two auxiliary static contact points 312. The arc extinguishing technology of the arc extinguishing assembly 33 is the prior art, which usually comprises two magnets attached to the left and right sides of the ceramic cover 31, the two static contacts 311 are located between the two magnets, and the magnetic poles of the two magnets are oppositely arranged (for example, the N pole of one magnet is oppositely arranged with the S pole of the other magnet), and the magnetic field generated by the two magnets is used to extinguish the arc generated between the static contact 311 and the moving contact bridge 3210.

[0061] As shown in FIGS. 4-6, the contact mechanism 32 of the present embodiment includes a core sleeve 3201, a moving core 3202, a main spring 3203 providing elastic return force for the moving core 3202, a driving module 3204, a magnetic 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 stationary contact 311 form a main contact, the magnetic yoke 3205 covers the top port of the core sleeve 3201, the copper tube 3206 is welded on the magnetic yoke 3205, the moving core 3202 is movably installed in the core sleeve 3201 and is oppositely arranged with the magnetic yoke 3205, one end of the driving module 3204 passes through the magnetic yoke 3205 and is connected with the moving core 3202, the other end of the driving module 3204 is limitingly matched with the magnetic yoke 3205 and can drive the moving contact bridge 3210 to switch with the stationary contact 311 between open and closed states. The part of the contact mechanism 32 above the magnetic 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 the present embodiment is a prior art, which generally includes a coil framework and a coil sleeved on the coil framework, the core sleeve 3201 of the contact system 3 is riveted and fixed in the axial hole of the coil framework, the moving core 3202 moves upward and is attracted to the magnetic yoke 3205 when the coil is electrified; the main spring 3203 drives the moving core 3202 to move downward and repel the magnetic yoke 3205 when the coil is not electrified.

[0062] In particular, as shown in FIG. 3, FIG. 7 and FIG. 8, the auxiliary movable contact module 3212 of the embodiment includes a mounting frame, a reed 32123 (also referred to as an auxiliary movable contact) mounted on the mounting frame, and a push rod 32124 movably arranged on the mounting frame, the reed 32122 is closed with the auxiliary static contact 312 to make the auxiliary circuit conductive, and the reed 32122 is disconnected with the auxiliary static contact 312 to make the auxiliary circuit disconnected, the mounting frame is fixed on the magnetic yoke 3205, the mounting frame and the magnetic yoke 3205 form a moving space for the movable contact bridge 3210 to move, and 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, the contact system and the DC contactor of the embodiment, the magnetic yoke 3205 serves as the movement reference of the driving module 3204, the magnetic yoke 3205 is limited by the moving iron core 3202 connected with the driving module 3204 to limit the driving module 3204 from above, and the magnetic yoke 3205 also limits the driving module 3204 from below, the auxiliary movable contact module 3212 is fixed on the magnetic yoke 3205 through the mounting frame, and the auxiliary movable contact module 3212 is interlocked with the driving module 3204 to limit the movement of the auxiliary movable contact module 3212, so that the mechanical parameter adjustment and fixation of the auxiliary movable contact module 3212 can be completed before welding and sealing, and the working reliability of the auxiliary movable contact module 3212 after welding is ensured; at the same time, the height of the auxiliary movable contact module 3212 is determined by the height of the mounting frame fixed on the magnetic yoke 3205, the size chain is single, the accumulated tolerance is small, and the risk of over-pushing or insufficient pushing caused by the movement stroke of the driving module 3204 affected by the tolerance is reduced.

[0063] As shown in FIG. 8 and FIG. 9, the mounting frame includes a mounting seat 32122 as the top of the mounting frame and an outer support 32121 as the bottom of the mounting frame and fixedly connected between the mounting seat 32122 and the magnetic yoke 3205, the mounting seat 32122 is made of insulating material, the mounting seat 32122 is provided with a push rod groove 321228 for slidingly cooperating with the push rod 32124 and a reed groove 321229 for cooperating with the reed 32123, and the push rod groove 321228 is communicated with the moving space and the reed groove 321229. Specifically, the side wall of the mounting seat 32122 at the top of the mounting frame is arranged in close contact with the inner side wall of the ceramic cover 31, the top wall and the side wall of the ceramic cover 31 form a closed space with the mounting seat 32122, the reed 32123 of the contact mechanism 32 is located in the closed space, and the push rod 32124 of the contact mechanism 32 is slidably arranged in the push rod groove 321228 of the mounting seat 32122 for communicating the closed space with the moving space. The mounting seat 32122 and the push rod 32124 thereon form a closed closed space for accommodating the reed 32123 with the ceramic cover 31, which effectively prevents the scattered arc from invading the signal circuit.

[0064] As shown in FIG. 8 and FIG. 9, the mounting base 32122 is provided with two spring slot 321229 on both sides of the push rod slot 321228; the auxiliary movable contact module 3212 includes two springs 32123 respectively installed in the two spring slots 321229, one of which is a static spring 32123 and the other is a movable spring 32123, both of which are electrically connected to two auxiliary static contacts 312, and the front ends of the two springs 32123 are arranged in layers and are spaced apart above the push rod 32124. The push rod 32124 moves upward and pushes the movable spring 32123, so that the front ends of the two springs 32123 are in contact, thereby connecting the two auxiliary static contacts 312; the push rod 32124 moves downward, the movable spring 32123 returns to its original state, and the front ends of the two springs 32123 are disconnected, thereby disconnecting the two auxiliary static contacts 312. In this embodiment, the contact or disconnection between the two springs 32123 connected to the two auxiliary static contacts 312 respectively realizes the switching of the on-off state between the two auxiliary static contacts 312. Of course, as another embodiment, one spring 32123 can be provided, and the two ends of the spring 32123 are respectively spaced apart and opposite to the two auxiliary static contacts 312, and the contact or disconnection between the two ends of the spring 32123 and the two auxiliary static contacts 312 realizes the switching of the on-off state between the two auxiliary static contacts 312.

[0065] As shown in FIG. 16-FIG. 18, the spring 32123 is a sheet structure made of a good conductive elastic alloy, the rear end of the spring 32123 is provided with a through hole 321231 which can be used for the auxiliary static contact 312 to pass through, and the rear end of the spring 32123 extends out a wing 321232 to both sides, and the rear end of the spring 32123 is also folded back to form a spring 321233 which can be used for elastic abutment with the auxiliary static contact 312.

[0066] As shown in FIG. 13-15, the push rod slot 321228 of the mounting seat 32122 includes a first sunken seat 321221 arranged in the middle of the mounting seat 32122 and a second through hole 321222 arranged in the middle of the first sunken seat 321221. The spring leaf slot 321229 of the mounting seat 32122 includes an outer sunken groove 321224 arranged at the end of the mounting seat 32122, two side insertion grooves 321225 arranged at both sides of the outer sunken groove 321224 and used for cooperating with the wing 321232, an inner sunken groove 321223 communicated between the outer sunken groove 321224 and the first sunken seat 321221 of the push rod slot 321228, and a supporting rib 321227 arranged in the inner sunken groove 321223 and used for supporting the front end of the spring leaf 32123. The front end of the spring leaf 32123 is located in the inner sunken groove 321223 and placed on the supporting rib 321227, the wing 321232 of the spring leaf 32123 is inserted into the side insertion groove 321225, and the spring leaf 32123 is located in the outer sunken groove 321224.

[0067] As shown in FIG. 16-18, one of the connection structures of the spring leaf 32123 and the auxiliary static contact 312 is that the rear end of the spring leaf 32123 is U-shaped. There are various connection modes of the spring leaf 32123 and the auxiliary static contact 312, one of which is that the spring leaf 32123 is installed downward as shown in FIG. 3 and FIG. 28, one end of the auxiliary static contact 312 passes through the through hole 321231 and abuts on the inner side of the spring leaf 321233; another is that the spring leaf 321233 of the left spring leaf 32123 is installed upward as shown in FIG. 21, one end of the left auxiliary static contact 312 abuts on the outer side of the spring leaf 321233; and the other is that the spring leaf 321233 of the right spring leaf 32123 is installed downward as shown in FIG. 21, one end of the right auxiliary static contact 312 abuts on the rear end of the right spring leaf 32123.

[0068] Another scheme of the connection structure of the reed 32123 and the auxiliary static contact 312 is shown in the fourth embodiment of Figs. 38-40. The rear end of the reed 32123 is V-shaped with the spring piece 321233, and the end of the spring piece 321233 has an inwardly bent hook 321234. As shown in Fig. 37, the spring 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 spring piece 321233. This design increases the stiffness of the spring piece 321233, and the hook 321234 at the end of the spring piece 321233 provides greater contact pressure, further improving the connection reliability of the reed 32123 and the auxiliary static contact 312. The corresponding outer sink groove 321224 of the reed 32123 is further sunken to make room.

[0069] As shown in Figs. 19 and 20, the push rod 32124 is made of insulating material and includes a limiting plate 31244 slidingly arranged in the first sink 321221 of the mounting seat 32122, a convex point 321241 arranged on the top surface of the limiting plate 31244 and used to push the reed 32123, and a cylinder 321242 arranged on the bottom surface of the limiting plate 31244 and slidingly matched with the second through hole 321222 of the mounting seat 32122, the bottom end of the cylinder 321242 is provided with a second sink 231243 with an inclined surface.

[0070] The mounting rack has at least three schemes. The first scheme is the first embodiment shown in Figs. 9-15. The outer support 32121 of the mounting rack includes two U-shaped frames 321212 made of metal and having openings upward, and the top portions of the two U-shaped frames 321212 are respectively clamped and fixed with the two ends of the mounting seat 32122. The two ends of the mounting seat 32122 are provided with support insertion grooves 321226, the top portions of the U-shaped frames 321212 are provided with tongue pieces 321215 matched with the support insertion grooves 321226, and the tongue pieces 321215 are provided with convex petals 321216 to prevent the tongue pieces 321215 from being easily pulled out of the support insertion grooves 321226. Specifically, the two side plates of the U-shaped frame 321212 are respectively provided with two bending wing pieces 321213 located on the two sides to increase the strength, and the top portions of the two side plates of the U-shaped frame 321212 are respectively provided with steps 321214, the top surface of the step 321214 is upwardly extended to form the tongue piece 321215. The mounting rack of the embodiment is assembled by the mounting seat 32122 made of insulating material and the outer support 32121 made of metal material, which reduces the insulating material components of the mounting rack, reduces gas pollution, and has high structural stability.

[0071] In the embodiment, as shown in FIG. 6 and FIG. 12, the bottom plate of the U-shaped frame 321212 of the outer support 32121 is respectively provided with a fixing slot 321211, and the magnetic yoke 3205 is provided with a fixing protrusion 32051 fixedly inserted into the fixing slot 321211. Preferably, the fixing slot 321211 is a circular through slot, and the fixing protrusion 32051 is a circular bump.

[0072] The second scheme is shown in the second embodiment of FIG. 24-FIG. 27. The outer support 32121 includes two vertical plates 321219 which are respectively integrally connected with two ends of the mounting seat 32122 of the mounting frame. The mounting frame of the embodiment is an integrally formed structure made of insulating material, which is simple in structure and convenient for production and assembly. In the embodiment, as shown in FIG. 22 and FIG. 27, the two vertical plates 321219 of the outer support 32121 are respectively provided with a fixing slot 321211, and the magnetic yoke 3205 is provided with a fixing protrusion 32051 fixedly inserted into the fixing slot 321211. Preferably, the fixing slot 321211 is a square slot, and the fixing protrusion 32051 is a square block.

[0073] The third scheme is shown in the third embodiment of FIG. 31-FIG. 36. The difference from the first scheme is that the outer support 32121 of the mounting frame further includes a connecting portion 321217, the middle portion of the connecting portion 321217 is provided with a first through hole 321218 for the driving module 3204 to pass through, and two ends of the connecting portion 321217 are integrally connected with the bottom plates of the two U-shaped frames 321212. That is, the outer support 32121 of the embodiment is an integrally formed structure, which makes the structure of the outer support 32121 more stable.

[0074] As shown in FIG. 4-FIG. 6, the contact mechanism 32 includes a fixed support 3207 fixed on the other end of the driving module 3204 and used for driving the push rod 32124, a restoring spring 3208 providing elastic restoring force for the lower magnetic sheet 3209, and oppositely arranged lower magnetic sheet 3209 and upper magnetic sheet 3211. The fixed support 3207 is an inverted U-shaped structure, the upper magnetic sheet 3211 is riveted and fixed on the inner side of the top edge of the fixed support 3207, the lower magnetic sheet 3209 is a U-shaped structure with an opening opposite to the upper magnetic sheet 3211, the middle portion of the movable contact bridge 3210 is mounted on the inner side of the bottom edge of the lower magnetic sheet 3209, and the two ends of the movable contact bridge 3210 extend out of the active space and are respectively matched with two static contacts 311, so that the movement direction of the auxiliary movable contact point module 3212 away from the electric arc generated between the movable contact bridge 3210 and the static contact 311 is changed, and the gas pollution is reduced.

[0075] As shown in FIG. 41-42, the drive module 3204 includes a metal rod 32041, an insulating seat 32042 for limiting cooperation with the magnetic yoke 3205, and two symmetrically arranged support pads 32043, one end of the metal rod 32041 and one end of the support pad 32043 are injection molded into the insulating seat 32042 to form the other end of the drive module 3204, the metal rod 32041 is located in the middle of the insulating seat 32042 and between the two support pads 32043. As shown in FIG. 5, the two side edges of the fixed support 3207 are provided with plug-in holes for plug-in cooperation with the other end of the support pad 32043. One end of the restoring spring 3208 is connected to the outer side of the bottom edge of the lower magnetic sheet 3209, and the other end of the restoring spring 3208 is connected to the insulating seat 32042. The structure for connecting the restoring spring 3208 of the lower magnetic sheet 3209 and the insulating seat 32042 can be a plane, a protrusion, a groove, etc.

[0076] As shown in FIG. 3 and FIG. 5, the action process of the DC contactor of the embodiment, when the coil of the electromagnetic system 4 is energized, the moving iron core 3202 is excited and moves upward against the compression of the main spring 3203, the drive module 3204 moves upward with the moving iron core 3202, the restoring spring 3208 compresses the lower magnetic sheet 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 overtravel, the moving iron core 3202 further moves upward to be attracted to the magnetic yoke 3205, the moving iron core 3202 drives the drive module 3204 and the fixed support 3207 fixed on the drive module 3204 to move upward, the upper magnetic sheet 3211 moves upward with the fixed support 3207 to be disconnected with the lower magnetic sheet 3209, at the same time, the fixed support 3207 pushes the reed 32123 upward through the push rod 32124 to make the two reeds 32123 closed, so that the two auxiliary static contact points 312 are connected, realizing the current main contact (the moving contact bridge 3210 and the static contact 311) closed state through the auxiliary moving contact module 3212.

[0077] It should be noted that in the description of the present application, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when in use, and are only for the convenience of description, and cannot be understood as indicating that the device or element referred to must have a particular orientation, therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description, and cannot be understood as indicating relative importance.

[0078] The above is further detailed description of the present application in combination with specific preferred embodiments, and cannot be deemed as limitation of the specific implementation of the present application. For those skilled in the art to which the present application belongs, without departing from the concept of the present application, a number of simple deductions or substitutions can be made, which shall be deemed as falling within the protection scope of the present application.

Claims

1. A contact mechanism, comprising a moving iron core (3202), a main spring (3203) providing elastic return 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 point module (3212), the moving iron core (3202) is arranged opposite to the magnetic yoke (3205), one end of the driving module (3204) passes through the magnetic yoke (3205) and is connected with the moving iron core (3202), the other end of the driving module (3204) is limitedly matched with the magnetic yoke (3205) and drives the moving contact bridge (3210) to switch the open and closed state with a static contact (311), characterized in that: The auxiliary moving contact module (3212) comprises a mounting frame, a reed (32123) mounted on the mounting frame in a position limited manner, and a push rod (32124) movably arranged on the mounting frame, the mounting frame is fixed on the magnetic yoke (3205), an activity space for the moving contact bridge (3210) to move is formed between the mounting frame and the magnetic yoke (3205), and the driving module (3204) can drive the push rod (32124) to push the reed (32123) to turn on and turn off the two auxiliary static contacts (312).

2. The contact mechanism of claim 1, wherein: The mounting frame comprises a mounting seat (32122) as a top of the mounting frame and an outer support (32121) as a bottom of the mounting frame and fixedly connected between the mounting seat (32122) and the magnetic yoke (3205), the mounting seat (32122) is provided with a push rod groove (321228) in sliding fit with the push rod (32124) and a reed groove (321229) in fit with the reed (32123), and the push rod groove (321228) is communicated with the reed groove (321229) and the activity space.

3. The contact mechanism of claim 2, wherein: The mounting seat (32122) is provided with two reed grooves (321229) on both sides of the push rod groove (321228); the auxiliary moving contact module (3212) comprises two reeds (32123) respectively mounted in the two reed grooves (321229), the two reeds (32123) are respectively electrically connected with the two auxiliary static contacts (312), and front ends of the two reeds (32123) are arranged in a spaced apart manner in a vertical direction and above the push rod (32124).

4. The contact mechanism of claim 3, wherein: The reed (32123) is in a sheet structure, the reed (32123) is provided with a through hole (321231) at a rear end thereof, wings (321232) extend from both sides of the rear end of the reed (32123), and the rear end of the reed (32123) is further folded back to form an auxiliary static contact spring piece (321233). The rear end of the reed (32123) and the spring piece (321233) are in a U shape; or the rear end of the reed (32123) and the spring piece (321233) are in a V shape, and the spring piece (321233) is provided with a hook (321234) bent inward at a terminal end thereof.

5. The contact mechanism of claim 4, wherein: The reed groove (321229) comprises an outer recess (321224) arranged at an end of the mounting seat (32122), two side insertion grooves (321225) arranged on both sides of the outer recess (321224) and used for fit with the wings (321232), and an inner recess (321223) communicated between the outer recess (321224) and the push rod groove (321228).

6. The contact mechanism of claim 2, wherein: The push rod slot (321228) comprises a first sunken platform (321221) arranged in the middle of the mounting base (32122) and a second through hole (321222) arranged in the middle of the first sunken platform (321221); the push rod (32124) comprises a limiting plate (31244) slidingly arranged in the first sunken platform (321221), a convex point (321241) arranged on the top surface of the limiting plate (31244) and used for pushing the spring leaf (32123), and a cylinder (321242) arranged on the bottom surface of the limiting plate (31244) and slidingly matched with the second through hole (321222).

7. The contact mechanism of claim 2, wherein: The outer support (32121) comprises two vertical plates (321219) which are respectively integrally connected with two ends of the mounting base (32122).

8. The contact mechanism of claim 2, wherein: The outer support (32121) comprises two U-shaped frames (321212) made of metal and having openings upward, and the top portions of the two U-shaped frames (321212) are respectively clamped and fixed with the two ends of the mounting base (32122).

9. The contact mechanism of claim 8, wherein: The two ends of the mounting base (32122) are provided with support insertion grooves (321226), the top portions of the U-shaped frames (321212) are provided with tongue pieces (321215) matched with the support insertion grooves (321226), and the tongue pieces (321215) are provided with convex petals (321216). Furthermore, the outer support (32121) further comprises a connecting portion (321217), the middle portion of the connecting portion (321217) is provided with a first through hole (321218) for the driving module (3204) to pass through, and the two ends of the connecting portion (321217) are respectively integrally connected with the bottom plates of the two U-shaped frames (321212).

10. The contact mechanism of claim 2, wherein: The outer support (32121) is provided with a fixing groove (321211), and the magnetic yoke (3205) is provided with a fixing convex (32051) fixedly inserted into the fixing groove (321211).

11. The contact mechanism of claim 1, wherein: The fixing support (3207) fixed on the other end of the driving module (3204) and used for driving the push rod (32124), the restoring spring (3208) providing elastic restoring force for the lower magnetic sheet (3209), the oppositely arranged lower magnetic sheet (3209) and upper magnetic sheet (3211), the upper magnetic sheet (3211) fixed on the fixing support (3207), the middle portion of the movable contact bridge (3210) mounted on the lower magnetic sheet (3209), and the two ends of the movable contact bridge (3210) extending out of the activity space and respectively matched with the two static contactors (311) are further included.

12. The contact mechanism of claim 11, wherein: The drive module (3204) comprises a metal rod (32041), an insulating seat (32042) for limiting cooperation with the magnetic yoke (3205), and two supporting washers (32043), one end of the metal rod (32041) and one end of the supporting washer (32043) are 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 supporting washers (32043); the fixed support (3207) is provided with a plug hole for plug-in cooperation with the other end of the supporting washer (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).

13. A direct current contactor comprising an electromagnetic system (4) and a contact system (3), said contact system (3) being mounted on the electromagnetic system (4), characterized in that: The contact system comprises a ceramic shell (31), an arc extinguishing assembly (33) and the contact mechanism (32) of any one of claims 1-12, the ceramic shell (31) is mounted on the magnetic yoke (3205) of the contact mechanism (32), the part of the contact mechanism (32) above the magnetic yoke (3205) is located in the ceramic shell (31), the part of the contact mechanism (32) above the magnetic yoke (3205) at least comprises the auxiliary moving contact module (3212) and the moving contact bridge (3210), the arc extinguishing assembly (33) is attached to the outer side wall of the ceramic shell (31).

14. The DC contactor of claim 13, wherein: The side wall of the mounting seat (32122) on the top of the auxiliary moving contact module (3212) mounting frame is fitted with the inner side wall of the ceramic shell (31), the top wall and the side wall of the ceramic shell (31) and the mounting seat (32122) form a closed space, the reed (32123) of the contact mechanism (32) is located in the closed space, the push rod (32124) of the contact mechanism (32) is slidingly installed in the push rod slot (321228) of the mounting seat (32122) for communicating the closed space and the active space.

15. The DC contactor of claim 13, wherein: The contact system (3) comprises a ceramic shell (31), an arc extinguishing assembly (33) and the contact mechanism (32) of any one of claims 1-12, the ceramic shell (31) is mounted on the magnetic yoke (3205) of the contact mechanism (32), the part of the contact mechanism (32) above the magnetic yoke (3205) is located in the ceramic shell (31), the part of the contact mechanism (32) above the magnetic yoke (3205) at least comprises the auxiliary moving contact module (3212) and the moving contact bridge (3210), the arc extinguishing assembly (33) is attached to the outer side wall of the ceramic shell (31). The contact system (3) comprises a ceramic shell (31), an arc extinguishing assembly (33) and the contact mechanism (32) of any one of claims 1-12, the ceramic shell (31) is mounted on the magnetic yoke (3205) of the contact mechanism (32), the part of the contact mechanism (32) above the magnetic yoke (3205) is located in the ceramic shell (31), the part of the contact mechanism (32) above the magnetic yoke (3205) at least comprises the auxiliary moving contact module (3212) and the moving contact bridge (3210), the arc extinguishing assembly (33) is attached to the outer side wall of the ceramic shell (31). The contact system (3) comprises a ceramic shell (31), an arc extinguishing assembly (33) and the contact mechanism (32) of any one of claims 1-12, the ceramic shell (31) is mounted on the magnetic yoke (3205) of the contact mechanism (32), the part of the contact mechanism (32) above the magnetic yoke (3205) is located in the ceramic shell (31), the part of the contact mechanism (32) above the magnetic yoke (3205) at least comprises the auxiliary moving contact module (3212) and the moving contact bridge (3210), the arc extinguishing assembly (33) is attached to the outer side wall of the ceramic shell (31).

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