Contact mechanism and direct current contactor

Abstract

A contact mechanism and a direct current contactor of the present invention. An auxiliary moving contact module moves in an interlocked manner with a transmission member, which is a moving part, and a moving contact bridge on the transmission member, a dimensional chain is short, and the movement stroke is stable and reliable. Since a reed is in interlocking fit with the transmission member and the moving contact bridge by means of a base, the transmission member can push the base to enable the moving contact bridge and the reed to synchronously perform disconnection motion, so that necessary disconnection can be ensured by means of a relatively large counterforce of a main spring even if the reed is adhered to an auxiliary fixed contact, thereby ensuring that the on-off states of a main contact and an auxiliary loop are consistent.

Description

Contact mechanism and DC contactor

[0001] The present application claims priority to Chinese Patent Application No. 202411310269.X 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, 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 a movement driving module, and drives the mechanical reed placed on the insulating seat by the insulating push rod to output the current working state of the contactor. For example, the auxiliary contact structures disclosed in CN202111109082.X and CN201610947762.1 set a mechanical reed on a movement driving module and ensure electrical insulation with the main circuit, and drive 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, the auxiliary contact structure disclosed in CN202211139451.4 emphasizes 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, the 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.

[0012] 5. In some of the above solutions, if the contacts are fused during disconnection, the auxiliary contacts may disconnect prematurely due to the overtravel of the main contacts, causing the motion drive module to move down prematurely. This results in an inconsistency between the main contacts and the auxiliary contacts. Summary of the Invention

[0013] The purpose of this invention is to overcome at least one defect of the prior art and to provide a contact mechanism, a contact system and a DC contactor.

[0014] To achieve the above objectives, the present invention adopts the following technical solution:

[0015] The contact mechanism comprises a driving module, a fixed support, a transmission member, a movable contact bridge, an auxiliary movable contact module and a restoring spring for providing elastic restoring force to the transmission member, the fixed support is fixed on the driving module, the movable contact bridge is installed on the transmission member, the driving module drives the transmission member through the restoring spring, the movable contact bridge moves with the transmission member to switch the opening and closing state with the static contact, the fixed support is drivingly matched with the base in the closing direction of the movable contact bridge, the fixed support drives the base to move when the movable contact bridge is closed with the static contact, and the transmission member is drivingly matched with the base in the opening direction of the movable contact bridge, the transmission member drives the base to move synchronously when the movable contact bridge is opened with the static contact.

[0016] Optionally, the two ends of the base extend downward to form two buckles on the two sides of the transmission member, and the two sides of the transmission member are provided with a bayonet, and the buckle extends into the bayonet and is limitedly matched with the upper side of the bayonet.

[0017] Optionally, a push spring is arranged between the base and the fixed support, the push spring is a helical spring made of spring metal, the lower part of the base is provided with a lower limiting column for limiting one end of the push spring, and the upper part of the fixed support is provided with a convex calyx for limiting the other end of the push spring.

[0018] Optionally, the upper part of the base is provided with a sunken groove for accommodating the reed, the reed is in a sheet structure, the middle part of the reed is limitedly fixed in the sunken groove, and the two ends of the reed are respectively bent upward to form two wing plates matched with two auxiliary static contacts.

[0019] Optionally, the auxiliary movable contact module further comprises an upper cover, the upper cover covers the middle part of the reed and is fixedly connected with the base, so that the middle part of the reed is limited between the bottom wall of the sunken groove of the upper cover and the base.

[0020] Optionally, the sunken groove of the base is provided with an upper limiting column, and the middle part of the reed is provided with a limiting hole for limiting cooperation with the upper limiting column; the upper cover is in a sheet structure, the middle part of the upper cover is provided with a hole column abutting against the reed, and the center hole of the hole column is fixedly matched with the upper limiting column.

[0021] And / or, the width of the upper cover is the same as the width of the sunken groove, and the length of the upper cover is less than the length of the sunken groove, so that the upper cover and the side wall of the sunken groove have a clearance for avoiding the auxiliary static contact, and the upper cover partially covers the wing plate.

[0022] Optionally, the upper magnetic sheet is further included, the transmission member is a magnetic conducting structure oppositely arranged with the upper magnetic sheet, the base has a containing space, the fixed support is an inverted U-shaped structure, the top part is located in the containing space, the upper magnetic sheet is fixed on the inner side of the top edge of the fixed support, the transmission member is an U-shaped structure with an opening opposite to the upper magnetic sheet, the middle part of the movable contact bridge is mounted on the inner side of the bottom edge of the transmission member, and the two ends of the movable contact bridge extend out of the containing space and are matched with the two static contactors respectively.

[0023] Optionally, the drive module includes a metal rod, an insulating seat and two supporting washers, one end of the metal rod and one end of the supporting washer are integrally injected into the insulating seat, the metal rod is 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 transmission member, and the other end of the restoring spring is connected to the insulating seat.

[0024] The DC contactor comprises an electromagnetic system and a contact system, the contact system is installed on the electromagnetic system, the contact system comprises a ceramic housing and an arc extinguishing assembly, the arc extinguishing assembly is attached to the outer sidewall of the ceramic housing, the contact system further comprises the contact mechanism of any one of the embodiments, the ceramic housing is installed on the magnetic yoke of the contact mechanism, and the part, located above the magnetic yoke, of the contact mechanism is located in the ceramic housing.

[0025] Optionally, the DC contactor comprises a shell and a bottom cover which are buckled together, a plug, the electromagnetic system and the contact system which are installed in the shell, the contact system is installed on the electromagnetic system, two auxiliary static contact points of the contact system are electrically connected with the control circuit respectively, and the plug is installed in the plug hole on the shell and is electrically connected with the control circuit.

[0026] The contact mechanism and the DC contactor have the following advantages: the auxiliary movable contact point module is interlocked with the moving part transmission member and the movable contact bridge on the transmission member, the size chain is short, and the movement stroke is stable and reliable; since the reed is interlocked with the transmission member and the movable contact bridge through the base, the transmission member can push the base to make the movable contact bridge and the reed move synchronously, even if the reed is adhered to the auxiliary static contact point, the main spring can still separate the reed and the auxiliary static contact point, so that the on-off state of the main contact and the auxiliary circuit is consistent.

[0027] In addition, when the contactor is attracted, the fixed support compresses the pushing spring to generate an overstroke of the auxiliary movable contact module, effectively avoiding the defects of excessive or insufficient pushing; due to the setting of the pushing spring and the interlocking of the auxiliary movable contact module with the transmission member and the movable contact bridge, the pushing spring always maintains an upward force on the auxiliary movable contact module, so that whether the spring leaf of the auxiliary movable contact module is deformed or not, the normal signal output of the auxiliary movable contact module can be ensured, and even if the main contact is welded, the pushing spring can also ensure a more stable contact pressure of the auxiliary movable contact module, so that when the contactor is released, the auxiliary movable contact module will not be disconnected from the auxiliary static contact due to the overstroke of the main contact, avoiding the distortion of the signal output.

[0028] In addition, the upper side limiting cooperation between the buckle arranged on the base and the card hole arranged on the transmission member realizes the interlocking cooperation between the transmission member and the base, which is simple in structure, stable and reliable in cooperation, and improves the synchronicity of the downward movement of the base and the transmission member. BRIEF DESCRIPTION OF DRAWINGS

[0029] Fig. 1 is an exploded view of the contactor of the present application;

[0030] Fig. 2 is a perspective view of the contact system of the present application;

[0031] Fig. 3 is a sectional view of the contact system of the present application in a non-energized state;

[0032] Fig. 4 is a sectional view of the contact system of the present application in an energized state;

[0033] Figs. 5-7 are structural schematic diagrams of the contact mechanism of the present application;

[0034] Figs. 8-10 are structural schematic diagrams of the auxiliary movable contact module of the present application;

[0035] Figs. 11-12 are structural schematic diagrams of the base of the present application;

[0036] Figs. 13-14 are structural schematic diagrams of the spring leaf of the present application;

[0037] Figs. 15-16 are structural schematic diagrams of the upper cover of the present application;

[0038] Figs. 17-19 are structural schematic diagrams of the transmission member of the present application;

[0039] Figs. 20-21 are structural schematic diagrams of the driving module of the present application.

[0040] 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 pad 32043; magnetic yoke 3205; copper tube 3206; fixed support 3207; recovery spring 3208; transmission member 3209; bayonet 32091; moving contact bridge 3210; upper magnetic sheet 3211; auxiliary moving contact module 3212; base 32121; sink 321211; upper limit post 321212; buckle 321214; lower limit post 321215; reed 32122; limit hole 321221; wing 321222; push spring 32123; upper cover 32124; hole column 321242; arc extinguishing assembly 33; electromagnetic system 4; control circuit 5; bottom cover 6. DETAILED DESCRIPTION

[0041] 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 descriptions of the following examples.

[0042] As shown in FIG. 1-4, 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.

[0043] As shown in FIGS. 3-5, 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 fixed support 3207, a transmission member 3209, a moving contact bridge 3210, an upper magnetic sheet 3211, an auxiliary moving contact module 3212, and a restoring spring 3208 providing elastic return force for the transmission member 3209, the moving contact bridge 3210 and the stationary contact 311 form a main contact, the magnetic yoke 3205 covers the top end of the core sleeve 3201, the magnetic yoke 3205 is fixedly welded with 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 oppositely arranged with the magnetic yoke 3205, one end of the driving module 3204 penetrates through the magnetic yoke 3205 and is connected with the moving core 3202, the fixed support 3207 is fixed on the other end of the driving module 3204, the upper magnetic sheet 3211 is fixed on the fixed support 3207, the transmission member 3209 is a magnetic conducting structure oppositely arranged with the upper magnetic sheet 3211, the moving contact bridge 3210 is installed on the transmission member 3209, and the driving module 3204 drives the transmission member 3209 through the restoring spring 3208, so that the moving contact bridge 3210 moves with the transmission member 3209 to switch the opening and closing state with the stationary contact 311. 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, and the core sleeve 3201 of the contact system 3 is riveted and fixed in the axial hole of the coil framework, as shown in FIG. 4, when the coil is energized, the moving core 3202 moves upward and is attracted to the magnetic yoke 3205; as shown in FIG. 3, when the coil is not energized, the main spring 3203 drives the moving core 3202 to move downward and repel the magnetic yoke 3205.

[0044] In particular, as shown in FIGS. 3, 4, 8, and 10, the auxiliary movable contact module 3212 includes a base 32121 and a reed 32122 (also referred to as an auxiliary movable contact) mounted on the base 32121, the reed 32122 is closed with the auxiliary stationary contact 312 to make the auxiliary circuit conductive, the reed 32122 is disconnected with the auxiliary stationary contact 312 to make the auxiliary circuit non-conductive, the fixed support 3207 is drivingly connected with the base 32121 in the closing direction of the movable contact bridge 3210 (upward in FIG. 3) to make the fixed support 3207 drive the base 32121 to move when the movable contact bridge 3210 is closed with the stationary contact 311, the transmission member 3209 is drivingly connected with the base 32121 in the opening direction of the movable contact bridge 3210 (downward in FIG. 3) to make the transmission member 3209 drive the base 32121 to move synchronously when the movable contact bridge 3210 is opened with the stationary contact 311. During the switching of the movable contact bridge 3210 to be closed with the stationary contact 311, the fixed support 3207 moves with the driving module 3204 to drive the base 32121, so that the reed 32122 moves with the base 32121 to connect the two auxiliary stationary contacts 312; during the switching of the movable contact bridge 3210 to be opened with the stationary contact 311, the driving module 3204 drives the transmission member 3209 through the restoring spring 3208 to make the base 32121 move synchronously with the transmission member 3209, so that the reed 32122 moves with the base 32121 to disconnect the two auxiliary stationary contacts 312. In the contact mechanism, the contact system, and the DC contactor of the embodiment, the auxiliary movable contact module 3212 is interlocked with the transmission member 3209 and the movable contact bridge 3210 on the transmission member 3209, the size chain is short, and the movement stroke is stable and reliable; considering the possible cold welding phenomenon of the reed 32122 of the auxiliary movable contact module 3212, since the reed 32122 is interlocked with the transmission member 3209 and the movable contact bridge 3210 through the base 32121, the transmission member 3209 can push the base 32121 to make the movable contact bridge 3210 move synchronously with the reed 32122 to disconnect, which ensures that even if the reed 32122 is adhered with the auxiliary stationary contact 312, it can be disconnected by the larger reverse force of the main spring 3203, thereby ensuring that the main contact and the auxiliary circuit are consistent in the on-off state.

[0045] As shown in FIG. 3-4, the base 32121 and the fixed support 3207 are provided with a push spring 32123, which is a helical spring made of spring metal. The lower part of the base 32121 is provided with a lower limiting column 321215 (FIG. 11) for limiting one end of the push spring 32123. The upper part of the fixed support 3207 is provided with a convex calyx for limiting the other end of the push spring 32123. The fixed support 3207 drives the base 32121 through the push spring 32123, which can not only compress the push spring 32123 to drive the base 32121 to move synchronously, but also enable the fixed support 3207 and the base 32121 to move relatively under the elastic force of the push spring 32123. When the contactor is attracted, the fixed support 3207 compresses the push spring 32123 to generate an overstroke of the auxiliary moving contact module 3212, effectively avoiding the defects of excessive or insufficient pushing. Due to the setting of the push spring 32123, the auxiliary moving contact module 3212 is supported, and the transmission member 3209 serves as an upper limiting part for the auxiliary moving contact module 3212, so that the push spring 32123 always exerts an upward force on the auxiliary moving contact module 3212, ensuring the normal output of the signal of the auxiliary moving contact module 3212, or the fusion of the main contact, and the push spring 32123 also ensures a more stable contact pressure of the auxiliary moving contact module 3212, so that the auxiliary moving contact module 3212 will not be disconnected from the auxiliary static contact 312 due to the overstroke of the main contact when the contactor is released, avoiding the distortion of the signal output. The plastic structure in the direction of the arc movement of the main contact is reduced, and the gas pollution is reduced. The push spring 32123 is easy and stable to install.

[0046] As shown in FIG. 4, FIG. 11 and FIG. 17, the base 32121 extends downward at both ends to form two buckles 321214 on both sides of the transmission member 3209. The base 32121 has an accommodation space between the two buckles 321214. The transmission member 3209 is provided with a bayonet 32091 on both sides, and the buckle 321214 passes through the accommodation hole of the fixed support 3207 and extends into the bayonet 32091 to limit the upper side of the bayonet 32091. The buckle 321214 on the base 32121 and the bayonet 32091 on the transmission member 3209 are limited on the upper side to realize the interlocking cooperation between the transmission member 3209 and the base 32121, which is simple in structure, stable and reliable in cooperation, and improves the synchronization of the downward movement of the base 32121 and the transmission member 3209.

[0047] As shown in FIG. 8, FIG. 11 and FIG. 13, the base 32121 is made of insulating material, and the upper portion of the base 32121 is provided with a sink 321211 for accommodating a spring piece 32122. The spring piece 3212 is a sheet structure made of metal, and the middle portion of the spring piece 3212 is fixedly limited in the sink 321211. The two ends of the spring piece 32122 are respectively bent upward to form two wings 321222 cooperating with two auxiliary static contacts 312.

[0048] As shown in FIG. 8-16, the auxiliary moving contact module 3212 further comprises an upper cover 32124 covering the middle portion of the spring piece 3212 and fixedly connected with the base 32121, so that the middle portion of the spring piece 32122 is limited between the upper cover 32124 and the bottom wall of the sink 321211 of the base 32121. Preferably, the width of the upper cover 32124 is the same as the width of the sink 321211; the length of the upper cover 32124 is less than the length of the sink 321211, so that there is a clearance between the upper cover 32124 and the side wall of the sink 321211 for avoiding the auxiliary static contact 312, and the upper cover 32124 completely covers the middle portion of the spring piece 3212 and extends towards the length direction of the upper cover 32124 to partially cover the wings 321222 at both ends of the spring piece 3212. Without affecting the cooperation between the wings 321222 and the auxiliary static contact 312, the upper cover 32124 is as long as possible, so that the spring piece 32122 is fixedly limited in the semi-enclosed sink 321211 surrounded by the upper cover 32124 and the base 32121, effectively arc separation, and the risk of arc intrusion is reduced. Specifically, the sink 321211 of the base 32121 is provided with an upper limiting column 321212, and the middle portion of the spring piece 3212 is provided with a limiting hole 321221 limitingly cooperating with the upper limiting column 321212; the upper cover 32124 is a sheet structure made of insulating material, and the middle portion of the upper cover 32124 is provided with a hole column 321242 abutting against the spring piece 3212, and the center hole of the hole column 321242 is fixedly cooperated with the upper limiting column 321212. During installation, the spring piece 3212 is installed in the sink 321211 of the base 32121, the middle portion of the spring piece 3212 is sleeved on the upper limiting column 321212 through the limiting hole 321221, the upper cover 32124 covers the middle portion of the spring piece 3212, so that the upper portion of the upper limiting column 321212 is fixed in the center hole of the hole column 321242 of the upper cover 32124, and the hole column 321242 presses the middle portion of the spring piece 32122 to abut against the bottom wall of the sink 321211.

[0049] As shown in FIGS. 5-7, the fixed bracket 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 bracket 3207, the transmission member 3209 is an U-shaped structure with an opening opposite to the upper magnetic sheet 3211, the top is located in the accommodating space of the base 32121, the middle part of the movable contact bridge 3210 is installed on the inner side of the bottom edge of the transmission member 3209, the two ends of the movable contact bridge 3210 extend out of the accommodating space and are matched with two static contacts 311 respectively, so that the auxiliary movable contact point module 3212 is away from the electric arc movement direction of the main contact, and the risk of electric arc invasion is reduced.

[0050] As shown in FIGS. 20-21, the drive module 3204 includes a metal rod 32041, an insulating seat 32042 and two supporting pads 32043, one end of the metal rod 32041 and one end of the supporting pad 32043 are injection molded into the insulating seat 32042, and the metal rod 32041 is located in the middle part of the insulating seat 32042 and between the two supporting pads 32043. As shown in FIG. 5, the two side edges of the fixed bracket 3207 are provided with plug-in holes for plug-in cooperation with the other end of the supporting pad 32043. One end of the restoring spring 3208 is connected to the outer side of the bottom edge of the transmission member 3209, and the other end of the restoring spring 3208 is connected to the insulating seat 32042. The structure of the transmission member 3209 and the insulating seat 32042 for connecting the restoring spring 3208 can be a plane, a protrusion, a groove or the like.

[0051] The action principle of the direct current contactor of the embodiment is shown in FIG. 3. When the contact system 3 is in a non-excitation state (the contactor is released), the movable iron core 3202 is pressed and limited to the lower part of the iron core sleeve 3201 by the main spring 3203, and is in a repelled state with the magnetic yoke 3205; the restoring spring 3208 presses the transmission member 3209 and the movable contact bridge 3210, the transmission member 3209 is closed with the upper magnetic sheet 3211, and the movable contact bridge 3210 is disconnected with the static contact 311; the push spring 32123 presses the auxiliary movable contact point module 3212 upward, but the upper side of the bayonet 32091 of the transmission member 3209 presses the buckle 321214 of the base 32121 downward.

[0052] As shown in Fig. 4, when the contact system 3 is in the excited state (contactor attraction), the moving iron core 3202 is excited to overcome the compression of the main spring 3203 to the upper part of the core sleeve 3201, and enters the closed state with the magnetic yoke 3205. The restoring spring 3208 compresses the transmission member 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 drives the driving module 3204 and the fixed support 3207 and the upper magnetic sheet 3211 fixed on the driving module 3204 to move upward, so that the transmission member 3209 is disconnected with the upper magnetic sheet 3211, and at the same time, the fixed support 3207 compresses the push spring 32123 to compress the auxiliary moving contact module 3212 upward, so that the reed 32122 is closed with the auxiliary static contact 312, and the current main contact closed state is realized through the auxiliary moving contact module 3212 electric circuit output.

[0053] When the main contact is fused, the transmission member 3209 is fixed with the moving contact bridge 3210 synchronously, so that the downward force of the transmission member 3209 on the base 32121 is equal to the fusion force, and the transmission member 3209 is also tightly pressed with the upper magnetic sheet 3211 under the action of the restoring spring 3028, so that the upper magnetic sheet 3209 is subjected to the upward force (also approximately equal to the fusion force) of the transmission member 3209, thereby the moving contact bridge 3210, the transmission member 3209 and the upper magnetic sheet 3211 are fixed and cannot move, but the upward force of the push spring 32123 on the base 32121 always exists, so that the base 32121 cannot move downward without other external force.

[0054] 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 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, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only used for differentiation, and cannot be understood as indicating relative importance.

[0055] The above is a further detailed description of the present application in combination with specific preferred embodiments, and cannot be considered as limiting the specific implementation of the present application. For ordinary skilled persons in the technical field 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 should be considered as falling within the protection scope of the present application.

Claims

1. A contact mechanism, comprising a driving module (3204), a fixed support (3207), a transmission member (3209), a movable contact bridge (3210), an auxiliary movable contact module (3212) and a restoring spring (3208) for providing elastic restoring force to the transmission member (3209), the fixed support (3207) is fixed on the driving module (3204), the movable contact bridge (3210) is installed on the transmission member (3209), the driving module (3204) drives the transmission member (3209) through the restoring spring (3208), so that the movable contact bridge (3210) moves with the transmission member (3209) to switch the opening and closing state with the fixed contact (311), characterized in that: The auxiliary movable contact module (3212) comprises a base (32121) and a spring blade (32122) mounted on the base (32121) in a limited manner, the fixed support (3207) is drivingly connected with the base (32121) in the closing direction of the movable contact bridge (3210), so that the fixed support (3207) drives the base (32121) to move when the movable contact bridge (3210) is closed with the static contact (311), and the transmission member (3209) is drivingly connected with the base (32121) in the opening direction of the movable contact bridge (3210), so that the transmission member (3209) drives the base (32121) to move synchronously when the movable contact bridge (3210) is opened with the static contact (311).

2. The contact mechanism of claim 1, wherein: Both ends of the base (32121) extend downward to form two buckles (321214) on both sides of the transmission member (3209), and both sides of the transmission member (3209) are provided with a bayonet (32091), and the buckle (321214) extends into the bayonet (32091) and is limitedly connected with the upper side of the bayonet (32091).

3. The contact mechanism of claim 1, wherein: The base (32121) and the fixed support (3207) are provided with a push spring (32123), the push spring (32123) is a helical spring made of spring metal, the lower part of the base (32121) is provided with a lower limiting column (321215) for limiting one end of the push spring (32123), and the upper part of the fixed support (3207) is provided with a convex calyx for limiting the other end of the push spring (32123).

4. The contact mechanism of claim 1, wherein: The upper part of the base (32121) is provided with a sink (321211) for accommodating the spring blade (32122), the spring blade (3212) has a sheet structure, the middle part of the spring blade (3212) is limitedly fixed in the sink (321211), and both ends of the spring blade (32122) are respectively bent upward to form two wing plates (321222) for cooperating with the two auxiliary static contacts (312).

5. The contact mechanism of claim 4, wherein: The auxiliary movable contact module (3212) further comprises an upper cover (32124), the upper cover (32124) covers the middle part of the spring blade (3212) and is fixedly connected with the base (32121), so that the middle part of the spring blade (32122) is limited between the bottom wall of the sink (321211) of the upper cover (32124) and the base (32121).

6. The contact mechanism of claim 5, wherein: The sink (321211) of the base (32121) is provided with an upper limiting column (321212), the middle part of the spring blade (3212) is provided with a limiting hole (321221) for limiting cooperation with the upper limiting column (321212), the upper cover (32124) has a sheet structure, the middle part of the upper cover (32124) is provided with a hole column (321242) for abutting against the spring blade (3212), and the center hole of the hole column (321242) is fixedly connected with the upper limiting column (321212). And / or, the width of the upper cover (32124) is the same as the width of the sink (321211); the length of the upper cover (32124) is less than the length of the sink (321211), so that the upper cover (32124) and the sidewall of the sink (321211) have a clearance for avoiding the auxiliary static contact (312), and the upper cover (32124) partially covers the wing (321222).

7. The contact mechanism of claim 1, wherein: Further comprising an upper magnetic sheet (3211), the transmission member (3209) is a magnetic conductive structure opposite to the upper magnetic sheet (3211), the base (32121) has a containing space, the fixed support (3207) is an inverted U-shaped structure, the top part is located in the containing space, the upper magnetic sheet (3211) is fixed on the inner side of the top edge of the fixed support (3207), the transmission member (3209) is a U-shaped structure with an opening opposite to the upper magnetic sheet (3211), the middle part of the movable contact bridge (3210) is mounted on the inner side of the bottom edge of the transmission member (3209), and the two ends of the movable contact bridge (3210) extend out of the containing space and are respectively matched with two static contact heads (311).

8. The contact mechanism of claim 7, wherein: The drive module (3204) comprises a metal rod (32041), an insulating seat (32042) and two supporting spacers (32043), one end of the metal rod (32041) and one end of the supporting spacer (32043) are jointly injection molded into the insulating seat (32042), the metal rod (32041) is located in the middle part of the insulating seat (32042) and between the two supporting spacers (32043); the fixed support (3207) is provided with a plug-in hole for plug-in cooperation with the other end of the supporting spacer (32043); one end of the restoring spring (3208) is connected to the transmission member (3209), and the other end of the restoring spring (3208) is connected to the insulating seat (32042).

9. A direct current contactor comprising an electromagnetic system (4) and a contact system (3) mounted on the electromagnetic system (4), the contact system comprising a ceramic housing (31), an arc extinguishing assembly (33) attached to the outer lateral wall of the ceramic housing (31), characterized in that: The contact system further comprises the contact mechanism (32) of any one of claims 1-8, the ceramic shell (31) is mounted on the magnetic yoke (3205) of the contact mechanism (32), and the part of the contact mechanism (32) above the magnetic yoke (3205) is located in the ceramic shell (31).

10. The DC contactor of claim 9, wherein: The contact system further comprises the contact mechanism (32) of any one of claims 1-8, the ceramic shell (31) is mounted on the magnetic yoke (3205) of the contact mechanism (32), and the part of the contact mechanism (32) above the magnetic yoke (3205) is located in the ceramic shell (31). The contact system further comprises the contact mechanism (32) of any one of claims 1-8, the ceramic shell (31) is mounted on the magnetic yoke (3205) of the contact mechanism (32), and the part of the contact mechanism (32) above the magnetic yoke (3205) is located in the ceramic shell (31).

Images