Contact mechanism, contact system and direct current contactor

Abstract

According to the contact mechanism, the contact system and the DC contactor of the utility model, the auxiliary moving contact module moves with the moving part transmission member and the moving contact bridge on the transmission member in an interlocking manner, the dimension chain is short, and the movement stroke is stable and reliable; as the reed is in interlocking fit with the transmission piece and the movable contact bridge through the base, the transmission piece can push the base to enable the movable contact bridge and the reed to synchronously perform disconnection motion, and inevitable disconnection can be ensured through larger main spring counterforce even if the reed is adhered to the auxiliary static contact, so that the on-off states of the main contact and the auxiliary loop are ensured to be consistent.

Description

Technical Field

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

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

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

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

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

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

[0007] 1. Many plastic components are placed in the ceramic chamber, especially in the direction of contact arc movement. They can operate normally under an operating voltage below 1000VDC. However, when the operating voltage exceeds 1000VDC or even 1500VDC, the plastic components are damaged by strong arc erosion, affecting their structural stability. At the same time, they release gas, polluting the pure gas environment in the contact chamber.

[0008] 2. Further analysis of the motion dimension chain reveals that the dimensional basis of the motion drive module is the magnetic yoke. However, the above solutions usually place the auxiliary contact system on the ceramic cover or other components, resulting in an excessively long dimensional chain between the auxiliary contact system and the magnetic yoke. The dimensional tolerances of several parts are too large, which can affect the motion travel of the motion drive module and lead to the risk of overshoot or undershoot during the process.

[0009] 3. The auxiliary contact system of the above scheme will be more or less directly exposed in the ceramic contact cavity. When the arc intensity is high, the strong arc movement will fill the entire ceramic contact cavity. The exposed auxiliary contact system may short-circuit or even burn out directly under the strong arc.

[0010] 4. The auxiliary contact system and motion drive module components of the above solution are not mechanically interlocked. The mechanical parameters of the auxiliary contact system cannot be directly tested and fixed. After the welding of the ceramic contact cavity is completed, 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.

[0011] 5. Some of the above solutions have the problem that when disconnecting, if the contacts are welded, the auxiliary contacts will cause the motion drive module to move down prematurely and disconnect due to the overtravel of the main contacts, resulting in inconsistent states of the main contacts and auxiliary contacts. Utility Model Content

[0012] The purpose of the present 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.

[0013] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0014] The contact mechanism includes a driving module, a fixed bracket, a transmission member, a moving contact bridge, an auxiliary moving contact module, and a restoring spring that provides an elastic restoring force for the transmission member. The fixed bracket is fixed on the driving module. The moving contact bridge is installed on the transmission member. The driving module drives the transmission member through the restoring spring, so that the moving contact bridge moves with the transmission member to switch the opening and closing states with the static contact. The auxiliary moving contact module includes a base and a reed that is limit-mounted on the base. The fixed bracket is drivingly cooperated with the base in the closing direction of the moving contact bridge, so that when the moving contact bridge is closed with the static contact, the fixed bracket drives the base to move. The transmission member is drivingly cooperated with the base in the opening direction of the moving contact bridge, so that when the moving contact bridge is disconnected from the static contact, the transmission member drives the base to move synchronously.

[0015] Optionally, both ends of the base respectively extend downward to form two buckles located on both sides of the transmission member. The two sides of the transmission member are provided with bayonets, and the buckles extend into the bayonets and are limit-fitted with the upper side of the bayonets.

[0016] Optionally, a pushing spring is provided between the base and the fixed bracket. The pushing spring is a spiral spring made of spring metal. The lower part of the base is provided with a lower limit post for limiting one end of the pushing spring, and the upper part of the fixed bracket is provided with a convex bud for limiting the other end of the pushing spring.

[0017] Optionally, the upper part of the base is provided with a sinking groove for accommodating the reed. The reed is a sheet structure. The middle part of the reed is limit-fixed in the sinking groove. The two ends of the reed are respectively bent upward to form two wing pieces that cooperate with two auxiliary static contacts.

[0018] Optionally, the auxiliary moving contact module further includes an upper cover. The upper cover covers the middle part of the reed and is fixedly connected to the base, so that the middle part of the reed is limited between the upper cover and the bottom wall of the sinking groove of the base.

[0019] Optionally, an upper limit post is provided in the sinking groove of the base, and a limit hole that is limit-fitted with the upper limit post is provided in the middle part of the reed. The upper cover is a sheet structure. A perforated column that abuts against the reed is provided in the middle part of the upper cover, and the central hole of the perforated column is fixedly fitted with the upper limit post.

[0020] And / or, the width of the upper cover is the same as the width of the sinking groove. The length of the upper cover is less than the length of the sinking groove, so that there is a clearance for avoiding the auxiliary static contact between the upper cover and the side wall of the sinking groove, and the upper cover partially covers the wing piece.

[0021] Optionally, it further includes an upper magnetic sheet. The transmission member is a magnetic conductive structure arranged opposite to the upper magnetic sheet. The base has an accommodation space. The fixed bracket is an inverted U-shaped structure, and the top is located inside the accommodation space. The upper magnetic sheet is fixed on the inner side of the top edge of the fixed bracket. The transmission member is a U-shaped structure with an opening opposite to the upper magnetic sheet. The middle part of the moving contact bridge is installed on the inner side of the bottom edge of the transmission member. The two ends of the moving contact bridge extend out of the accommodation space and are respectively matched with two static contacts.

[0022] Optionally, the driving module includes a metal rod, an insulating seat, and two support washers. One end of the metal rod and one end of the support washer are jointly injection-molded into the insulating seat. The metal rod is located in the middle of the insulating seat and between the two support washers. The fixed bracket is provided with a socket hole that is inserted and matched with the other end of the support 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.

[0023] The contact system includes a ceramic housing and an arc extinguishing component. The arc extinguishing component is mounted on the outer side wall of the ceramic housing. It further includes the contact mechanism according to any one of the above. The ceramic housing is installed on the yoke of the contact mechanism, and the part of the contact mechanism located above the yoke is located inside the ceramic housing.

[0024] The DC contactor includes a mutually buckled outer shell and bottom cover, a plug, an electromagnetic system installed inside the outer shell, a control circuit, and the contact system described above. The contact system is installed on the electromagnetic system. The two auxiliary static contacts of the contact system are respectively electrically connected to the control circuit. The plug is inserted into the socket on the outer shell and is electrically connected to the control circuit.

[0025] For the contact mechanism, contact system, and DC contactor of the present utility model, the auxiliary moving contact module is interlocked with the moving part transmission member and the moving contact bridge on the transmission member. The dimension chain is short, and the movement stroke is stable and reliable. Since the reed is interlocked and cooperated with the transmission member and the moving contact bridge through the base, the transmission member can push the base to make the moving contact bridge and the reed synchronously perform a disconnection movement, ensuring that even if the reed adheres to the auxiliary static contact, it can be necessarily disconnected by a large main spring reaction force, thereby ensuring that the on-off states of the main contact and the auxiliary circuit are consistent.

[0026] In addition, when the contactor is closed, the fixed bracket compresses the push spring to generate an over-travel of the auxiliary moving contact module, effectively avoiding the defects of excessive or insufficient pushing; due to the setting of the push spring, and the auxiliary moving contact module is interlocked with the transmission part and the moving contact bridge, the push spring always maintains an upward acting force on the auxiliary moving contact module, so that regardless of whether the reed of the auxiliary moving contact module is deformed and yielded, it can ensure the normal output of the signal of the auxiliary moving contact module. Even if the main contact is welded, the push spring also enables the auxiliary moving contact module to ensure a more stable contact pressure, so that when the contactor is released, the auxiliary moving contact module will not be disconnected from the auxiliary static contact due to the over-travel of the main contact and the premature downward movement of the driving module, avoiding the distortion of the signal output.

[0027] In addition, the transmission part and the base are interlocked by the snap fastener arranged on the base and the upper limit cooperation of the bayonet arranged on the transmission part, with a simple structure, stable and reliable cooperation, and improved synchronism of the downward movement of the base and the transmission part. Brief Description of the Drawings

[0028] Figure 1 is an exploded view of the contactor of the present invention;

[0029] Figure 2 is a three-dimensional view of the contact system of the present invention;

[0030] Figure 3 is a cross-sectional view of the contact system of the present invention in the non-excited state;

[0031] Figure 4 is a cross-sectional view of the contact system of the present invention in the excited state;

[0032] Figures 5 - 7 is a schematic structural diagram of the contact mechanism of the present invention;

[0033] Figures 8 - 10 is a schematic structural diagram of the auxiliary moving contact module of the present invention;

[0034] Figures 11 - 12 is a schematic structural diagram of the base of the present invention;

[0035] Figures 13 - 14 is a schematic structural diagram of the reed of the present invention;

[0036] Figures 15 - 16 is a schematic structural diagram of the upper cover of the present invention;

[0037] Figures 17 - 19 is a schematic structural diagram of the transmission part of the present invention;

[0038] Figures 20 - 21 is a schematic structural diagram of the driving module of the present invention.

[0039] Housing 1; Plug 2; Contact system 3; Ceramic housing 31; Stationary contact 311; Auxiliary stationary contact point 312; Contact mechanism 32; Iron core sleeve 3201; Moving iron core 3202; Main spring 3203; Driving module 3204; Metal rod 32041; Insulating seat 32042; Support gasket 32043; Yoke 3205; Copper tube 3206; Fixed bracket 3207; Restoration spring 3208; Transmission part 3209; Bayonet 32091; Moving contact bridge 3210; Upper magnetic sheet 3211; Auxiliary moving contact module 3212; Base 32121; Sunk groove 321211; Upper limit post 321212; Snap fastener 321214; Lower limit post 321215; Reed 32122; Limit hole 321221; Fin 321222; Thrust spring 32123; Upper cover 32124; Column with hole 321242; Arc extinguishing component 33; Electromagnetic system 4; Control circuit 5; Bottom cover 6. Specific embodiments

[0040] The following embodiments given in conjunction with the accompanying drawings further illustrate the specific embodiments of the contact mechanism, contact system and DC contactor of the present invention. The contact mechanism, contact system and DC contactor of the present invention are not limited to the descriptions of the following embodiments.

[0041] As Figures 1 - 4As shown in the figure, the DC contactor of this embodiment includes a housing 1 and a bottom cover 6 that are buckled together, a plug 2, an electromagnetic system 4 installed in the housing 1, a control circuit 5, and a contact system 3. The contact system 3 is installed on the electromagnetic system 4. The contact system 3 includes a ceramic housing 31, an arc extinguishing assembly 33, and a contact mechanism 32. The ceramic housing 31 is installed on the yoke 3205 of the contact mechanism 32 through an iron bracket at the bottom of the ceramic housing 31. The part of the contact mechanism 32 above the yoke 3205 is located inside the ceramic housing 31, and the arc extinguishing assembly 33 is mounted on the outer side wall of the ceramic housing 31. Two static contacts 311 distributed left and right and two auxiliary static contacts 312 distributed front and back are provided on the top wall of the ceramic housing 31. The two static contacts 311 are symmetrically arranged, and one end of the static contact 311 penetrates the top wall of the ceramic housing 31 and extends into the ceramic housing 31. The auxiliary static contact 312 is a rod-shaped structure that penetrates the ceramic housing 31. The part of the auxiliary static contact 312 outside the ceramic housing 31 is used for electrical connection with the control circuit 5, and the part of the auxiliary static contact 312 inside the ceramic housing 31 is used for electrical connection with the auxiliary moving contact. The two auxiliary static contacts 312 are symmetrically arranged. The parts of the two auxiliary static contacts 312 outside the ceramic housing 31 are respectively electrically connected to the control circuit 5. The plug 2 is inserted into the jack on the housing 1 and is electrically connected to the control circuit 5. It should be noted that the plug 2 of this embodiment is a standard part; the principle of the control circuit 5 is prior art. When the two auxiliary static contacts 312 are connected, the control circuit 5 feeds back a signal to the external system through the plug 2. When the two auxiliary static contacts 312 are disconnected, the control circuit 5 stops feeding back a signal to the external system, realizing the real-time monitoring of the on-off state between the two auxiliary static contacts 312 (i.e., the on-off state of the auxiliary circuit). Since the on-off state between the two auxiliary static contacts 312 is set to be consistent with the switch state of the contactor (i.e., the opening and closing state of the main contact), the control circuit 5 realizes the signal feedback of the switch state of the contactor through the switching of the on-off state between the two auxiliary static contacts 312. The arc extinguishing technology of the arc extinguishing assembly 33 is prior art and usually includes two magnets mounted on the left and right sides of the ceramic housing 31. The two static contacts 311 are located between the two magnets, and the magnetic poles of the two magnets are arranged opposite to each other (for example, the N pole of one magnet is opposite to the S pole of the other magnet), and the arc generated between the static contact 311 and the moving contact bridge 3210 is extinguished by the magnetic field generated by the two magnets.

[0042] As Figures 3 - 5As shown in the figure, the contact mechanism 32 of this embodiment includes an iron core sleeve 3201, a moving iron core 3202, a main spring 3203 that provides an elastic reset force for the moving iron core 3202, a driving module 3204, a yoke 3205, a copper tube 3206, a fixed bracket 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 that provides an elastic reset force for the transmission member 3209. The moving contact bridge 3210 and the static contact 311 form a main contact. The yoke 3205 covers the top port of the iron core sleeve 3201, and the yoke 3205 is fixedly welded to the iron core sleeve 3201. The copper tube 3206 is welded to the yoke 3205. The moving iron core 3202 is movably installed inside the iron core sleeve 3201 and is disposed opposite to the yoke 3205. One end of the driving module 3204 passes through the yoke 3205 and is connected to the moving iron core 3202. The fixed bracket 3207 is fixed to the other end of the driving module 3204. The upper magnetic sheet 3211 is fixed to the fixed bracket 3207. The transmission member 3209 is a magnetic conduction structure disposed opposite to the upper magnetic sheet 3211. The moving 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 moving contact bridge 3210 moves with the transmission member 3209 to switch the opening and closing states with the static contact 311. It should be noted that the electromagnetic system 4 of this embodiment is a prior art, usually including a coil bobbin and a coil sleeved on the coil bobbin. The iron core sleeve 3201 of the contact system 3 is riveted and fixed in the axial hole of the coil bobbin, such as Figure 4 As shown in the figure, when the coil is energized, the moving iron core 3202 moves upward and is attracted to the yoke 3205; as Figure 3 shown, when the coil is de-energized, the main spring 3203 drives the moving iron core 3202 to move downward and repel from the yoke 3205.

[0043] Particularly, as Figure 3 、 4 、8, and 10 shown, the auxiliary moving contact module 3212 includes a base 32121 and a reed 32122 (also called an auxiliary moving contact) that is limitedly installed on the base 32121. The reed 32122 is closed with the auxiliary static contact 312 to make the auxiliary circuit conductive, and the reed 32122 is disconnected from the auxiliary static contact 312 to make the auxiliary circuit disconnected. The fixed bracket 3207 is drivingly cooperated with the base 32121 in the closing direction of the moving contact bridge 3210 ( Figure 3 the upward direction in the figure), so that when the moving contact bridge 3210 and the static contact 311 are closed, the fixed bracket 3207 drives the base 32121 to move. The transmission member 3209 is in the opening direction of the moving contact bridge 3210 ( Figure 3In the downward direction (in the middle), it is drivingly engaged with the base 32121, so that when the moving contact bridge 3210 is disconnected from the static contact 311, the transmission member 3209 drives the base 32121 to move synchronously. During the process of the moving contact bridge 3210 switching to being closed with the static contact 311, the fixed bracket 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 static contacts 312; during the process of the moving contact bridge 3210 switching to being disconnected from the static contact 311, the driving module 3204 drives the transmission member 3209 through the restoring spring 3208, so that the base 32121 and the transmission member 3209 move synchronously, so that the reed 32122 moves with the base 32121 to disconnect the two auxiliary static contacts 312. In the contact mechanism, the contact system and the DC contactor of this embodiment, the auxiliary moving contact module 3212 is interlocked with the moving member transmission member 3209 and the moving contact bridge 3210 on the transmission member 3209, the dimension chain is short, and the movement stroke is stable and reliable; considering the possible cold welding phenomenon of the reed 32122 of the auxiliary moving contact module 3212, since the reed 32122 is interlocked with the transmission member 3209 and the moving contact bridge 3210 through the base 32121, the transmission member 3209 can push the base 32121 to make the moving contact bridge 3210 and the reed 32122 move synchronously to disconnect, ensuring that even if the reed 32122 is adhered to the auxiliary static contact 312, it can be necessarily disconnected by the large reaction force of the main spring 3203, so as to ensure that the on-off states of the main contact and the auxiliary circuit are consistent.

[0044] As Figures 3 - 4 shown, a pushing spring 32123 is provided between the base 32121 and the fixed bracket 3207. The pushing spring 32123 is a helical spring made of spring metal. A lower limit post 321215 for limiting one end of the pushing spring 32123 is provided at the lower part of the base 32121 ( Figure 11) At the upper part of the fixed bracket 3207, there is a convex bud for limiting the other end of the pushing spring 32123. The fixed bracket 3207 drives the base 32121 through the pushing spring 32123, which can not only make the fixed bracket 3207 compress the pushing spring 32123 to drive the base 32121 to move synchronously, but also make the fixed bracket 3207 and the base 32121 move relatively under the elastic force of the pushing spring 32123. When the contactor is closed, the fixed bracket 3207 compresses the pushing spring 32123 to generate an over-travel of the auxiliary moving contact module 3212, effectively avoiding the defects of excessive or insufficient pushing. Due to the setting of the pushing spring 32123, it supports the auxiliary moving contact module 3212, and the transmission part 3209 plays an upper limit role on the auxiliary moving contact module 3212, so that the pushing spring 32123 always applies an upward force to the auxiliary moving contact module 3212, ensuring that the signal of the auxiliary moving contact module 3212 can be normally output regardless of whether the reed of the auxiliary moving contact module 3212 is deformed and yielded, or the main contact is welded. The pushing spring 32123 also enables the auxiliary moving contact module 3212 to ensure a more stable contact pressure, so that when the contactor is released, the auxiliary moving contact module 3212 will not be disconnected from the auxiliary static contact 312 due to the over-travel of the main contact and the premature downward movement of the driving module 3204, avoiding signal output distortion. Reduce the plastic structural parts in the direction of the main contact arc movement, reduce gas pollution; the pushing spring 32123 is convenient and stable to install.

[0045] As Figure 4 , Figure 11 and Figure 17 shown, at both ends of the base 32121, two buckles 321214 located on both sides of the transmission part 3209 extend downward respectively. The base 32121 has a receiving space between the two buckles 321214. On both sides of the transmission part 3209, there are bayonets 32091. The buckles 321214 pass through the relief holes of the fixed bracket 3207 and extend into the bayonets 32091 to be in upper limit fit with the upper side of the bayonets 32091. Through the upper limit fit of the buckles 321214 arranged on the base 32121 and the bayonets 3209 arranged on the transmission part 3209, the interlocking fit between the transmission part 3209 and the base 32121 is realized. The structure is simple, the fit is stable and reliable, and the synchronism of the downward movement of the base 32121 and the transmission part 3209 is improved.

[0046] As Figure 8 , Figure 11 and Figure 13As shown, the base 32121 is made of insulating material. An upper portion of the base 32121 is provided with a sunk groove 321211 for accommodating the reed 32122. The reed 32122 is a sheet-like structure made of metal. A middle portion of the reed 32122 is limited and fixed within the sunk groove 321211. Two ends of the reed 32122 are bent upward respectively to form two wings 321222 that cooperate with two auxiliary static contacts 312.

[0047] As Figures 8 - 16 As shown, the auxiliary moving contact module 3212 further includes an upper cover 32124. The upper cover 32124 covers the middle portion of the reed 32122 and is fixedly connected to the base 32121, so that the middle portion of the reed 32122 is limited between the upper cover 32124 and the bottom wall of the sunk groove 321211 of the base 32121. Preferably, a width of the upper cover 32124 is the same as a width of the sunk groove 321211; a length of the upper cover 32124 is less than a length of the sunk groove 321211, so that there is a clearance for avoiding the auxiliary static contact 312 between the upper cover 32124 and a side wall of the sunk groove 321211, and the upper cover 32124 completely covers the middle portion of the reed 32122 and extends along a length direction of the upper cover 32124 to partially cover the wings 321222 at two ends of the reed 32122. On the premise of not affecting the cooperation between the wings 321222 and the auxiliary static contact 312, the upper cover 32124 is lengthened as much as possible, so that the reed 32122 is limited and fixed within a semi-closed sunk groove 321211 formed by the upper cover 32124 and the base 32121, effectively isolating the arc and reducing the risk of arc intrusion. Specifically, an upper limiting post 321212 is provided within the sunk groove 321211 of the base 32121. A limiting hole 321221 for limiting and cooperating with the upper limiting post 321212 is provided in a middle portion of the reed 32122; the upper cover 32124 is a sheet-like structure made of insulating material. A perforated column 321242 abutting against the reed 32122 is provided in a middle portion of the upper cover 32124. A central hole of the perforated column 321242 is fixedly fitted with the upper limiting post 321212. During installation, the reed 32122 is inserted into the sunk groove 321211 of the base 32121. The middle portion of the reed 32122 is sleeved on the upper limiting post 321212 through the limiting hole 321221. The upper cover 32124 covers the middle portion of the reed 32122, so that an upper portion of the upper limiting post 321212 is fixed within the central hole of the perforated column 321242 of the upper cover 32124, and the perforated column 321242 presses the middle portion of the reed 32122 to abut against the bottom wall of the sunk groove 321211.

[0048] As Figures 5 - 7As shown, the fixing 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 fixing bracket 3207. The transmission member 3209 is a U-shaped structure with an opening opposite to the upper magnetic sheet 3211, and its top is located in the accommodation space of the base 32121. The middle part of the moving contact bridge 3210 is installed on the inner side of the bottom edge of the transmission member 3209. The two ends of the moving contact bridge 3210 extend out of the accommodation space and are respectively matched with the two static contacts 311, so that the auxiliary moving contact module 3212 moves away from the arc movement direction of the main contact, reducing the risk of arc intrusion.

[0049] As Figures 20 - 21 shown, the driving module 3204 includes a metal rod 32041, an insulating seat 32042 and two support washers 32043. One end of the metal rod 32041 and one end of the support washer 32043 are jointly injection-molded into the insulating seat 32042. The metal rod 32041 is located in the middle of the insulating seat 32042 and between the two support washers 32043. As Figure 5 shown, the two side edges of the fixing bracket 3207 are provided with insertion holes that are inserted and matched with the other ends of the support washers 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 structures of the transmission member 3209 and the insulating seat 32042 for connecting the restoring spring 3208 can be structures such as a plane, a protrusion, or a groove.

[0050] The operating principle of the DC contactor in this embodiment is as Figure 3 shown. When the contact system 3 is in a non-excited state (the contactor is released), the moving iron core 3202 is pressed by the main spring 3203 and limited to the lower part of the iron core sleeve 3201, and is in a state of repulsion from the magnetic yoke 3205; the restoring spring 3208 presses the transmission member 3209 and the moving contact bridge 3210, the transmission member 3209 is closed with the upper magnetic sheet 3211, and the moving contact bridge 3210 is disconnected from the static contact 311; the pushing spring 32123 presses the auxiliary moving contact 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.

[0051] As Figure 4As shown, when the contact system 3 is in the excited state (the contactor is closed), after the moving iron core 3202 is excited, it overcomes the compression of the main spring 3203 and moves to the upper part of the iron core sleeve 3201, entering the state of closing with the yoke 3205. The restoring spring 3208 compresses the transmission part 3209 and the moving contact bridge 3210, causing the moving contact bridge 3210 to close 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 bracket 3207 and the upper magnetic sheet 3211 fixed on the driving module 3204 to move upward, disconnecting the transmission part 3209 from the upper magnetic sheet 3211. At the same time, the fixed bracket 3207 compresses the top push spring 32123 to upwardly press the auxiliary moving contact module 3212, so that the reed 32122 is closed with the auxiliary static contact 312, realizing the output of the current main contact closed state through the electrical circuit of the auxiliary moving contact module 3212.

[0052] When the main contact is welded, the transmission part 3209 and the moving contact bridge 3210 are synchronously fixed. Therefore, the downward force exerted by the transmission part 3209 on the base 32121 is equal to the welding force. And the transmission part 3209 is also tightly pressed together with the upper magnetic sheet 3211 under the action of the restoring spring 3028. The upper magnetic sheet 3209 receives an upward force from the transmission part 3209 (also approximately equal to the welding force). Thus, the moving contact bridge 3210, the transmission part 3209, and the upper magnetic sheet 3211 are all fixed and cannot move. However, the upward force exerted by the top push spring 32123 on the base 32121 always exists. Therefore, the base 32121 will not move downward without other external forces.

[0053] It should be noted that in the description of the present invention, the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in the usual placement during use. It is only for the convenience of description and does not indicate that the indicated device or element must have a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be construed as indicating relative importance.

[0054] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should all be regarded as belonging to the protection scope of the present invention.

Claims

1. Contact mechanism, comprising a driving module (3204), a fixed bracket (3207), a transmission member (3209), a moving contact bridge (3210), an auxiliary moving contact module (3212) and a restoring spring (3208) that provides an elastic restoring force for the transmission member (3209), the fixed bracket (3207) is fixed on the driving module (3204), the moving contact bridge (3210) is mounted on the transmission member (3209), 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 static contact (311), characterized in that: The auxiliary moving contact module (3212) includes a base (32121) and a reed (32122) limit-mounted on the base (32121). The fixed bracket (3207) is drivingly engaged with the base (32121) in the closing direction of the moving contact bridge (3210), so that when the moving contact bridge (3210) is closed with the static contact (311), the fixed bracket (3207) drives the base (32121) to move. The transmission member (3209) is drivingly engaged with the base (32121) in the opening direction of the moving contact bridge (3210), so that when the moving contact bridge (3210) is disconnected from the static contact (311), the transmission member (3209) drives the base (32121) to move synchronously.

2. The contact mechanism according to claim 1, wherein: Both ends of the base (32121) extend downward respectively to form two buckles (321214) located on both sides of the transmission member (3209). The two sides of the transmission member (3209) are provided with bayonets (32091), and the buckles (321214) extend into the bayonets (32091) and are in limit fit with the upper side of the bayonets (32091).

3. The contact mechanism according to claim 1, wherein: A push spring (32123) is provided between the base (32121) and the fixed bracket (3207). The push spring (32123) is a helical spring made of spring metal. The lower part of the base (32121) is provided with a lower limit post (321215) for limiting one end of the push spring (32123), and the upper part of the fixed bracket (3207) is provided with a convex bud for limiting the other end of the push spring (32123).

4. The contact mechanism according to claim 1, wherein: The upper part of the base (32121) is provided with a sinking groove (321211) for accommodating the reed (32122). The reed (32122) is a sheet-like structure. The middle part of the reed (32122) is limit-fixed in the sinking groove (321211). Both ends of the reed (32122) are bent upward respectively to form two wing pieces (321222) for cooperating with the two auxiliary static contacts (312).

5. The contact mechanism according to claim 4, characterized in that: The auxiliary moving contact module (3212) further includes an upper cover (32124). The upper cover (32124) covers the middle part of the reed (32122) and is fixedly connected to the base (32121), so that the middle part of the reed (32122) is limited between the upper cover (32124) and the bottom wall of the sinking groove (321211) of the base (32121).

6. The contact mechanism according to claim 5, characterized in that: An upper limit post (321212) is provided in the sinking groove (321211) of the base (32121). A limit hole (321221) for limit cooperation with the upper limit post (321212) is provided in the middle part of the reed (32122); the upper cover (32124) is a sheet-like structure. A perforated column (321242) in contact with the reed (32122) is provided in the middle part of the upper cover (32124), and the central hole of the perforated column (321242) is fixedly cooperated with the upper limit post (321212); And / or, the width of the upper cover (32124) is the same as that of the sunk groove (321211); the length of the upper cover (32124) is less than that of the sunk groove (321211), so that there is a clearance for avoiding the auxiliary static contact (312) between the upper cover (32124) and the side wall of the sunk groove (321211), and the upper cover (32124) partially covers the fin (321222).

7. The contact mechanism according to claim 1, characterized in that: It further includes an upper magnetic sheet (3211), the transmission member (3209) is a magnetic conductive structure arranged opposite to the upper magnetic sheet (3211), the base (32121) has an accommodation space, the fixing bracket (3207) is an inverted U-shaped structure, the top is located in the accommodation space, the upper magnetic sheet (3211) is fixed on the inner side of the top edge of the fixing bracket (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 moving contact bridge (3210) is installed on the inner side of the bottom edge of the transmission member (3209), and the two ends of the moving contact bridge (3210) extend out of the accommodation space and are respectively matched with the two static contacts (311).

8. The contact mechanism according to claim 7, characterized in that: The driving module (3204) includes a metal rod (32041), an insulating seat (32042) and two support gaskets (32043). One end of the metal rod (32041) and one end of the support gasket (32043) are jointly injection-molded into the insulating seat (32042). The metal rod (32041) is located in the middle of the insulating seat (32042) and between the two support gaskets (32043). The fixing bracket (3207) is provided with a socket hole for plugging and matching with the other end of the support gasket (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. Contact system, including a ceramic housing (31) and an arc extinguishing component (33), the arc extinguishing component (33) being mounted on the outer side wall of the ceramic housing (31), characterized in that: It further includes the contact mechanism (32) according to any one of claims 1-8. The ceramic housing (31) is installed on the magnetic yoke (3205) of the contact mechanism (32), and the part of the contact mechanism (32) located above the magnetic yoke (3205) is located inside the ceramic housing (31).

10. DC contactor, characterized in that: It includes a mutually buckled outer shell (1) and bottom cover (6), a plug (2), an electromagnetic system (4) installed in the outer shell (1), a control circuit (5) and the contact system (3) according to claim 9. The contact system (3) is installed on the electromagnetic system (4). The two auxiliary static contacts (312) of the contact system (3) are respectively electrically connected to the control circuit (5). The plug (2) is inserted into the jack on the outer shell (1) and is electrically connected to the control circuit (5).

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