A direct current contactor with high insulation withstand voltage

Abstract

The application relates to the technical field of contactors, in particular to a direct-current contactor with high insulation withstand voltage, which comprises an arc extinguishing cover and a conducting contact post, the conducting contact post extends into the inside of the arc extinguishing cover, the inside of the arc extinguishing cover is further provided with a movable contact plate and an insulation rod group seat, the movable contact plate is driven to move by the insulation rod group seat, the movable contact plate is in contact with or separated from the conducting contact post, and the on-off control of the contactor is realized; after being switched to a high insulation withstand voltage state, the direct-current contactor is kept in communication, the control push tube is physically separated from the insulation rod group seat, the insulation withstand voltage performance is greatly improved, and the special high-voltage working condition is coped with.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of contactors, in particular to a DC contactor with high insulation withstand voltage. BACKGROUND

[0002] The DC contactor is an electromagnetic control device specially used for connecting or cutting off the DC circuit, and the core function is to realize remote and automatic control of high-power loads in a DC power supply system. With the rapid development of the energy storage market and the continuous progress of technology, the demand for high insulation withstand voltage of DC contactors is increasing in the super-charging platform of new energy vehicle fast-charging market, such as 800v, 1000v, etc.

[0003] The DC contactor in the prior art has limited withstand voltage performance under the same material specification. When facing occasional high-voltage working conditions with high load, the withstand voltage performance is insufficient, and the high-voltage region is prone to creepage breakdown to the low-voltage region, causing damage to the low-voltage electrical system. If the contactor is directly set according to the highest voltage peak value that may occur in the use scene, the cost will increase due to the large area layout under the condition that only occasional high-voltage load occurs in some scenes, and the volume of the contactor with higher withstand voltage performance usually grows in proportion. Due to the volume limitation of the contactor, even the space cannot meet the hard conditions of installation. SUMMARY

[0004] The purpose of the present application is to provide a DC contactor with high insulation withstand voltage to solve the problem of insufficient withstand voltage performance of the existing DC contactor in the background art.

[0005] To achieve the above purpose, the present application provides the following technical scheme: a DC contactor with high insulation withstand voltage, comprising an arc extinguishing cover and a conducting contact post, the conducting contact post extends into the inside of the arc extinguishing cover, the inside of the arc extinguishing cover is further provided with a moving contact plate and an insulation rod group seat, the moving contact plate is driven to move by the insulation rod group seat, so that the moving contact plate and the conducting contact post are in contact or separated from each other, thereby realizing the on-off control of the contactor; a cover-in platform is fixedly arranged on the inner wall of the arc extinguishing cover, an extension pin capable of extending and retracting is arranged in the insulation rod group seat, a control push tube is arranged below the insulation rod group seat, the axial movement of the control push tube can drive the insulation rod group seat to move, and the control push tube and the insulation rod group seat can be actively separated; when the extension pin extends, the extension pin is limited and clamped on the upper part of the cover-in platform in the contact state of the moving contact plate and the conducting contact post, and after the control push tube and the insulation rod group seat are actively separated, the moving contact plate and the conducting contact post remain in contact.

[0006] The two sides of the insulating rod group seat are fixedly provided with rib structures, a lateral groove is formed below the two sides of the insulating rod group seat, and a bottom groove is formed in the bottom of the insulating rod group seat, so that the creepage length of the moving contact plate to the control push tube is increased through cooperation of the rib structures, the lateral groove and the bottom groove; and the bottom of the arc extinguishing cover is provided with a PC insulating sheet.

[0007] The insulating rod group seat is provided with an expansion cavity hole, an expansion pin is inserted into the expansion cavity hole, and the expansion pin is in sealing contact with the inner wall surface of the expansion cavity hole; the insulating rod group seat is also provided with a gas pressure flow channel, a center butt joint groove is formed in the center position of the lower surface of the insulating rod group seat, and the center butt joint groove is communicated with the expansion cavity hole through the gas pressure flow channel; the upper end of the control push tube is inserted into the center butt joint groove, and the outer surface of the control push tube is in sealing contact with the inner wall surface of the center butt joint groove.

[0008] The inner wall surface of the center butt joint groove is provided with an annular lock groove, a pipe wall lock block is inserted into the sidewall of the control push tube, a lock block spring sheet is fixedly connected between the pipe wall lock block and the inner wall of the control push tube, and the lock block spring sheet applies an elastic driving force to the pipe wall lock block, so that the pipe wall lock block has a tendency to retract into the control push tube.

[0009] The inner wall surface of the center butt joint groove is provided with an annular lock groove, a pipe wall lock block is inserted into the sidewall of the control push tube, a lock block spring sheet is fixedly connected between the pipe wall lock block and the inner wall of the control push tube, and the lock block spring sheet applies an elastic driving force to the pipe wall lock block, so that the pipe wall lock block has a tendency to retract into the control push tube.

[0010] When the control push tube is inserted into the center butt joint groove, the pressure in the expansion cavity hole is changed by the pressure change in the control push tube, so as to control the expansion and contraction of the expansion pin.

[0011] The lower end of the control push tube is provided with a sealing ring sleeve, the control inner shaft passes through the sealing ring sleeve, and the control inner shaft and the sealing ring sleeve are in sealing contact, the lower end of the sealing ring sleeve is fixedly provided with a driving frame, and the outer surface of the driving frame is provided with a limiting cover, so that the driving frame can only drive the control inner shaft to move axially.

[0012] The driving frame is provided with a screw rod shaft which is screwed, and the screw rod shaft can drive the driving frame to move along the axial direction of the control inner shaft when the screw rod shaft rotates, the end of the screw rod shaft is provided with a micro motor for driving the screw rod shaft to rotate, the outer surface of the limiting cover is fixedly provided with a motor mounting cylinder, and the micro motor is fixedly installed in the motor mounting cylinder.

[0013] The surface of the control push tube is provided with a flexible air pipe, and the other end of the flexible air pipe is provided with a variable pressure cavity pipe; the inside of the variable pressure cavity pipe is provided with a cavity pipe piston, the inside of the variable pressure cavity pipe generates positive pressure or negative pressure through the axial movement of the cavity pipe piston, and then the transmission of the flexible air pipe changes the internal pressure of the control push tube.

[0014] A one-way beam valve is embedded and installed on the cavity pipe piston, and the one-way beam valve remains closed when the inside of the variable pressure cavity pipe is under positive pressure, and performs flow limiting and air suction when the inside of the variable pressure cavity pipe is under negative pressure.

[0015] A cavity spring is arranged above the cavity pipe piston, a connecting frame is fixedly arranged below the cavity pipe piston, a magnetic attraction ring is fixedly arranged outside the connecting frame, and an electromagnet module is arranged above the magnetic attraction ring; when the electromagnet module is powered on, a magnetic force can be generated to attract the magnetic attraction ring to move upward, at this time, the cavity pipe piston overcomes the elastic support force of the cavity spring and moves upward, so that the inside of the variable pressure cavity pipe is under positive pressure.

[0016] A moving iron core is fixedly arranged outside the control push tube, an iron core spring is arranged above the moving iron core, and a control coil is sleeved outside the moving iron core; when the control coil is powered on, a magnetic driving force can be applied to the moving iron core to make the moving iron core move axially against the elastic force of the iron core spring.

[0017] Compared with the prior art, the beneficial effects of the present application are:

[0018] The present application has the switching function of high insulation withstand voltage state through the structure of cover inner platform, telescopic pin and control push tube, etc., and has the advantages of quick response of traditional DC contactor on-off action in conventional mode, and the control push tube is physically separated from the insulation rod group seat while keeping the DC contactor connected after switching to high insulation withstand voltage state, thereby greatly improving the insulation withstand voltage performance to cope with accidental special high pressure working conditions. The working conditions suitable for the DC contactor of the present application can be flexibly adjusted, and the application range is wide.

[0019] The telescopic pin, variable pressure cavity pipe and one-way beam valve are arranged in the DC contactor of the present application, and the structure cooperates to prevent misconnection mode, and when switching to misconnection prevention mode, the situation that the moving iron core overcomes the elastic force of the iron core spring due to external force impact and causes misconnection of the DC contactor can be effectively avoided, and the safety is greatly improved in high-risk high-demand working conditions.

[0020] The present application greatly improves the creepage length of the moving contact plate and the holding spring to the control push tube through the arrangement of the rib structure, lateral groove and bottom groove, and compared with the contactor structure in the prior art, the withstand voltage performance in conventional mode is improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 Fig. 1 is a schematic diagram of the overall structure of the present application.

[0022] Figure 2 Fig. 2 is a schematic diagram of the front perspective view of the present application.

[0023] Figure 3 Fig. 3 is a schematic diagram of the side perspective view of the upper part of the present application.

[0024] Figure 4 Fig. 4 is a schematic diagram of the side perspective view of the lower part of the present application.

[0025] Figure 5 Fig. 5 is a schematic diagram of the parts of the present application.

[0026] Figure 6 Fig. 6 is a schematic diagram of the variable pressure cavity tube of the present application.

[0027] Figure 7 Fig. 7 is a schematic diagram of the insulating rod group seat of the present application.

[0028] Figure 8 Fig. 8 is a schematic diagram of the moving iron core of the present application.

[0029] Figure 9 Fig. 9 is a schematic diagram of the variable pressure cavity tube of the present application.

[0030] Figure 10 Fig. 10 is a sectional view of the one-way beam valve.

[0031] In the figure: 1, arc-extinguishing cover; 2, conducting contact post; 3, moving contact plate; 4, insulating rod group seat; 5, cover inner platform; 6, telescopic pin; 7, control push tube; 401, rib structure; 402, lateral recess; 403, bottom recess; 101, PC insulating sheet; 701, telescopic cavity hole; 702, air pressure flow channel; 703, center butt joint groove; 704, annular lock groove; 705, tube wall lock block; 706, lock block elastic sheet; 707, control inner shaft; 708, inner wall ring protrusion; 709, sealing ring sleeve; 710, driving frame body; 711, limiting outer cover; 712, screw shaft; 713, micro motor; 714, motor mounting cylinder; 715, flexible air pipe; 716, variable pressure cavity tube; 717, cavity tube piston; 718, one-way beam valve; 719, cavity tube spring; 720, connecting frame; 721, magnetic attraction ring; 722, electromagnet module; 8, moving iron core; 801, iron core spring; 802, control coil; 102, copper bar; 9, insulating bakelite; 901, mounting angle iron; 301, upper pressing frame; 302, movable supporting frame; 303, retaining spring; 723, beam micro hole; 724, annular eave; 725, one-way valve disc; 726, valve disc spring. DETAILED DESCRIPTION

[0032] Clearly, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present application.

[0033] Please refer to Figures 1 to 10 , the present application provides a technical solution: a DC contactor with high insulation withstand voltage, comprising an arc extinguishing cover 1 and a conducting contact post 2, as shown in Figure 2 , the upper part of the conducting contact post 2 is detachably installed with a copper bar 102 through a screw, the conducting contact post 2 and the copper bar 102 are symmetrically provided with two groups, the external circuit is connected with the two groups of corresponding copper bars 102 respectively, in the closed conducting state of the DC contactor, the two groups of copper bars 102 are in a mutual communication state, at this time the external circuit is connected, in the open state of the DC contactor, the two groups of copper bars 102 are in a breaking state, at this time the external circuit is disconnected, the conducting contact post 2 extends into the inside of the arc extinguishing cover 1, the inside of the arc extinguishing cover 1 is further provided with a moving contact plate 3 and an insulating rod group seat 4, the moving contact plate 3 is driven to move by the insulating rod group seat 4, so that the moving contact plate 3 contacts or separates from the conducting contact post 2, thereby realizing the on-off control of the contactor; as shown in Figure 5 and Figure 7 , an upper pressing frame 301 is embedded and fixed on the insulating rod group seat 4, the moving contact plate 3 is arranged below the upper pressing frame 301, and the moving contact plate 3 is limited by the upper pressing frame 301; the lower part of the moving contact plate 3 is fixedly provided with a movable supporting frame 302, and a retaining spring 303 is arranged below the movable supporting frame 302, the retaining spring 303 provides an upward supporting elastic force for the movable supporting frame 302; when the insulating rod group seat 4 moves upward to drive the moving contact plate 3 to conductively contact the conducting contact post 2, the retaining spring 303 will be slightly compressed to ensure stable contact.

[0034] An inner cover plate 5 is fixedly arranged on the inner wall of the arc extinguishing cover 1, as shown in Figure 3 , the inner cover plate 5 is provided with two groups and is symmetrically distributed on the inner walls of the arc extinguishing cover 1. The insulating rod group seat 4 is provided with an extendable and retractable expansion pin 6, which can be positionally stable through friction force after being extended or retracted to the position. A control pushing tube 7 is arranged below the insulating rod group seat 4, the control pushing tube 7 is a circular tubular hollow structure, the insulating rod group seat 4 can be driven to move through the axial movement of the control pushing tube 7, and the control pushing tube 7 and the insulating rod group seat 4 can be actively separated; in the contact state of the moving contact plate 3 and the conducting contact post 2, when the expansion pin 6 is extended, the expansion pin 6 will be limited and clamped on the upper part of the inner cover plate 5, at this time the control pushing tube 7 and the insulating rod group seat 4 are actively separated, and the moving contact plate 3 and the conducting contact post 2 remain in contact.

[0035] The outer fixed setting of the control push tube 7 is provided with a moving iron core 8, the upper part of the moving iron core 8 is provided with an iron core spring 801, the outer part of the moving iron core 8 is sleeved with a control coil 802, when the control coil 802 is energized, the magnetic driving force can be applied to the moving iron core 8, so that the moving iron core 8 moves axially against the elastic force of the iron core spring 801.

[0036] As shown in Figure 2 The bottom of the DC contactor is provided with an insulating bakelite 9, the insulating bakelite 9 has insulation, and the two sides of the insulating bakelite 9 are fixedly installed with mounting angle irons 901 through screws, the mounting angle irons 901 are provided with nail holes, and the DC contactor is fixedly installed through the mounting angle irons 901.

[0037] The two sides of the insulating rod group seat 4 are fixedly provided with rib structures 401, the lower part of the rib structures 401 is provided with lateral recesses 402 at the positions of the two sides of the insulating rod group seat 4, and the bottom of the insulating rod group seat 4 is provided with a bottom recess 403, the rib structures 401, the lateral recesses 402 and the bottom recess 403 are matched to increase the creepage length of the moving contact plate 3 to the control push tube 7, and the rib structures 401, the lateral recesses 402 and the bottom recess 403 are arranged to increase the moving path when the current flows along the surface of the insulating rod group seat 4, thereby improving the withstand voltage performance.

[0038] The bottom of the arc extinguishing cover 1 is provided with PC insulating sheets 101, the PC insulating sheets 101 are provided with a plurality of groups, and the high-voltage inside of the arc extinguishing cover 1 is isolated from the low-voltage area through the PC insulating sheets 101. Figure 3

[0039] The DC contactor can also inject two-component silicone into the required area on the inside of the shell, thereby improving the withstand voltage performance of the product, the two-component silicone has low viscosity, high flowability and soft rubber state after curing, and the two-component silicone has good electrical insulation performance after curing.

[0040] The insulating rod group seat 4 is provided with an expansion cavity hole 701, the expansion pin 6 is inserted into the expansion cavity hole 701, and the expansion pin 6 is in sealing contact with the inner wall surface of the expansion cavity hole 701, the insulating rod group seat 4 is also provided with a gas pressure flow channel 702, the lower surface of the insulating rod group seat 4 is provided with a center butt joint groove 703, the center butt joint groove 703 is communicated with the expansion cavity hole 701 through the gas pressure flow channel 702, and the upper end of the control push tube 7 is inserted into the center butt joint groove 703, and the outer surface of the control push tube 7 is in sealing contact with the inner wall surface of the center butt joint groove 703.

[0041] ​The inner wall surface of the center butt joint groove 703 is provided with an annular lock groove 704, the side wall of the control push tube 7 is provided with a tube wall lock block 705, the tube wall lock block 705 and the inner wall of the control push tube 7 are fixedly connected with a lock block spring piece 706, the lock block spring piece 706 applies an elastic driving force to the tube wall lock block 705, so that the tube wall lock block 705 has a tendency to retract and move towards the inside of the control push tube 7.

[0042] The inside of the control push tube 7 is also provided with a control inner shaft 707, the control inner shaft 707 can be axially moved and adjusted, when the control inner shaft 707 moves to the corresponding position of the tube wall lock block 705, the tube wall lock block 705 can be moved outward by extruding the lock block spring piece 706, at this time, the tube wall lock block 705 is clamped in the annular lock groove 704, so that the insulating rod group seat 4 and the control push tube 7 are relatively locked;

[0043] The inner wall surface of the control push tube 7 is fixedly provided with an inner wall ring convex 708, the control inner shaft 707 is limited and supported by the inner wall ring convex 708, so that the control inner shaft 707 is located at the axis position of the control push tube 7; when the control push tube 7 is inserted into the inside of the center butt joint groove 703, the pressure change in the telescopic cavity hole 701 is driven by the pressure change in the inside of the control push tube 7, so as to control the telescopic movement of the telescopic pin 6.

[0044] The lower end of the control push tube 7 is provided with a sealing ring sleeve 709, the control inner shaft 707 penetrates through the sealing ring sleeve 709, and the control inner shaft 707 and the sealing ring sleeve 709 are in sealing contact, the lower end of the sealing ring sleeve 709 is fixedly provided with a driving frame body 710, the outside of the driving frame body 710 is sleeved with a limiting outer cover 711, the limiting outer cover 711 limits the rotation of the driving frame body 710, so that the driving frame body 710 can only drive the axial movement of the control inner shaft 707.

[0045] The driving frame body 710 is spirally matched with a lead screw shaft 712, the lead screw shaft 712 can drive the driving frame body 710 to move along the axis of the control inner shaft 707 when the lead screw shaft 712 rotates, the end of the lead screw shaft 712 is provided with a micro motor 713 for driving the rotation of the lead screw shaft 712, the outside of the limiting outer cover 711 is fixedly provided with a motor mounting cylinder 714, and the micro motor 713 is fixedly installed in the inside of the motor mounting cylinder 714; as shown in Figure 8 In the present application, the limiting outer cover 711 and the moving iron core 8 are fixedly installed by welding or screws, so when the moving iron core 8 moves up and down, the structures such as the limiting outer cover 711, the motor mounting cylinder 714 and the micro motor 713 move along, and the power supply of the micro motor 713 adopts flexible wires to avoid affecting the up and down movement of the moving iron core 8.

[0046] Similarly, a flexible air tube 715 is provided on the surface of the control push tube 7. The flexible air tube 715 can also bend and move, thereby avoiding affecting the up and down movement of the moving iron core 8. The other end of the flexible air tube 715 is connected to a transformer chamber tube 716.

[0047] The pressure-changing chamber 716 is equipped with a chamber piston 717. The axial movement of the chamber piston 717 generates positive or negative pressure inside the pressure-changing chamber 716. The pressure inside the control push tube 7 is then controlled by the transmission of the flexible air tube 715.

[0048] A one-way flow valve 718 is embedded in the piston 717 of the chamber. The one-way flow valve 718 remains closed when there is positive pressure inside the transformer chamber 716, and allows for flow-limited intake when there is negative pressure inside the transformer chamber 716. Figure 9 The one-way beam valve 718 installed in the middle has the following specific principle: Figure 10 As shown, the one-way beam valve 718 has a beam micro-hole 723, and an annular rim 724 is provided at the end of the one-way beam valve 718. A one-way valve disc 725 is provided on the upper part of the annular rim 724, and a valve disc spring 726 is provided on the upper part of the one-way valve disc 725. When the inside of the transformer chamber 716 is under positive pressure, the one-way valve disc 725 is pressed tightly against the annular rim 724 under the positive gas pressure, so that the one-way beam valve 718 remains closed. When the inside of the transformer chamber 716 is under negative pressure, the one-way valve disc 725 moves up and opens. At this time, the gas entering the transformer chamber 716 is beamed through the beam micro-hole 723 to achieve micro-limited gas intake.

[0049] A cavity spring 719 is provided above the cavity piston 717, and a connecting frame 720 is fixedly provided below the cavity piston 717. A magnetic ring 721 is fixedly provided outside the connecting frame 720, and an electromagnet module 722 is provided above the magnetic ring 721. When the electromagnet module 722 is energized, it can generate magnetic force to attract the magnetic ring 721 to move upward. At this time, the cavity piston 717 overcomes the elastic support force of the cavity spring 719 and moves upward, so that the inside of the transformer cavity 716 is under positive pressure.

[0050] In this invention, the DC contactor is connected to an external circuit via copper busbars 102. Two sets of copper busbars 102 are provided, and the two sets of copper busbars 102 can be switched on and off. In normal use, such as... Figure 7 As shown, the inner control shaft 707 is in the upward position. At this time, the pipe wall locking block 705 is squeezed into the annular locking groove 704 under the pressure of the inner control shaft 707, and the control push tube 7 and the insulating rod assembly seat 4 are relatively locked. The up and down movement of the control push tube 7 can drive the insulating rod assembly seat 4 to move up and down.

[0051] refer to Figure 2 and Figure 3As shown, when the control coil 802 is energized, the control coil 802 drives the moving iron core 8 to move upward through magnetic force. At this time, the iron core spring 801 is elastically compressed, and the moving iron core 8 drives the control push tube 7 to move upward, which in turn causes the insulating rod assembly 4 to drive the moving contact plate 3 to move upward. The moving contact plate 3 contacts the conducting contact post 2, making the two sets of copper busbars 102 conductive, thus completing the connection control of the external circuit. After the control coil 802 is de-energized, under the restoring force of the iron core spring 801, the moving iron core 8 and the control push tube 7 move downward. Similarly, the insulating rod assembly 4 and the moving contact plate 3 move downward synchronously, and the two sets of copper busbars 102 disconnect.

[0052] Under certain intermittent operating conditions, the electrical system needs to withstand higher voltages. That is, when the moving contact plate 3 is in contact with the conducting contact post 2 and the two sets of copper busbars 102 are conducting, the voltage flowing through the copper busbars 102 will be higher. In traditional DC contactors, the high voltage can easily creep along the surface of the insulating rod base 4 to the control push tube 7 through the moving contact plate 3 and the holding spring 303. Once creepage occurs, the high voltage will cause the low voltage parts such as the control coil 802 to break down through the control push tube 7, resulting in large-scale burnout of the low voltage electrical system.

[0053] When higher voltage is required, the insulating rod assembly 4 is in the upward position, and the moving contact plate 3 is in contact with the conducting contact post 2; for example Figure 3 As shown, Figure 3 The insulating rod assembly 4 shown is in the lowered position, according to Figure 3 As shown in the diagram, when the insulating rod assembly 4 is in the upward-moved position, the telescopic pin 6 is located on the upper part of the inner platform 5; first, the electromagnet module 722 is energized, such as... Figure 9 As shown, after the electromagnet module 722 is energized, it attracts the magnetic ring 721 to move upward, which in turn moves the piston 717 of the cavity tube upward. At this time, the inside of the transformer cavity tube 716 is under positive pressure, the one-way flow valve 718 remains closed, and the positive pressure inside the transformer cavity tube 716 enters the control push tube 7 through the flexible air tube 715, enters the air pressure channel 702 along the control push tube 7, and enters the telescopic cavity hole 701 through the air pressure channel 702 to drive the telescopic pin 6 to extend. (Reference) Figure 7 As shown in the image.

[0054] With the insulating rod assembly seat 4 in its upward-positioned state, when the telescopic pin 6 extends, it engages with the upper part of the inner platform 5, locking the insulating rod assembly seat 4 in a locked position and preventing it from moving downwards. At this time, the micro motor 713 controls the lead screw shaft 712 to rotate, causing the drive frame 710 to move downwards, which in turn moves the inner control shaft 707 downwards. (Refer to...) Figure 7 As shown, when the inner shaft 707 moves down, the pipe wall locking block 705 retracts inward under the elastic force of the locking block spring 706, at which time the control push tube 7 and the insulating rod assembly seat 4 are unlocked.

[0055] The power supply of the control coil 802 is turned off, and under the elastic force of the core spring 801, the control push tube 7 and the moving iron core 8 move downward, at this time, the control push tube 7 is directly physically separated from the insulating rod group seat 4, so that the DC contactor is switched to a high insulation voltage state, which can bear higher voltage, and the risk of breakdown in the high and low voltage area is reduced.

[0056] In the above process, when the control push tube 7 is separated from the insulating rod group seat 4, the upper part of the control push tube 7 is opened, and the positive pressure in the control push tube 7 is completely discharged, so that the cavity tube piston 717 is directly moved upward to the position, and the telescopic pin 6 is maintained in the extended state by the friction force, and is clamped above the cover inner platform 5, avoiding the downward movement of the insulating rod group seat 4.

[0057] In the reset, the control coil 802 is powered on first, so that the moving iron core 8 and the control push tube 7 move upward, the control push tube 7 is reinserted into the center butt joint groove 703, and then the control inner shaft 707 is controlled to move upward, so that the tube wall lock block 705 is clamped into the annular lock groove 704, and the control push tube 7 and the insulating rod group seat 4 are locked with each other, at this time, the power supply of the electromagnet module 722 is turned off, and when the electromagnet module 722 loses power, the magnetic force disappears, under the elastic pushing force of the cavity tube spring 719, the cavity tube piston 717 moves downward to reset, so that the inside of the pressure changing cavity tube 716 is in a negative pressure state, and similarly, the negative pressure passes through the flexible air pipe 715, the control push tube 7 and the air pressure flow channel 702 and other structures, and attracts the telescopic pin 6 to retract, when the telescopic pin 6 retracts to the position, the cavity tube piston 717 has not yet descended to the position, at this time, the slow beam flow is introduced through the one-way beam valve 718, so that the cavity tube piston 717 descends to the position after a corresponding period of time.

[0058] After the above reset is completed, the contactor of the present application returns to the normal state for use, and the above state adjustment switching takes more words in the action description, but in actual operation, only 1-2 seconds are needed to complete the switching control, which can quickly switch and adjust.

[0059] The DC contactor in the prior art drives the control push tube 7 to move up and down through the upward and downward movement of the moving iron core 8, realizes the on-off control of the contactor, however, in the off state of the contactor, the moving iron core 8 only relies on the elastic pressure of the core spring 801 to avoid upward movement, when the contactor is impacted by external force, due to the inertia of the moving iron core 8, once the inertia is enough to overcome the elastic support force of the core spring 801, the moving iron core 8 will move upward for a moment even if the control coil 802 is not powered on, which will cause the contactor to be mistakenly turned on for a moment, and bring great safety hazards.

[0060] The above structure design of the present application can prevent the problem at the same time. Figure 3The insulating rod group seat 4 shown in the middle is in the state of being lowered to position, and the contactor is disconnected. The electromagnetic module 722 is powered to make the inside of the variable pressure cavity tube 716 positive pressure, and the telescopic pin 6 is driven to extend. At this time, the telescopic pin 6 will be clamped below the lower plate 5 in the cover, so that the insulating rod group seat 4 and the control push tube 7 will not be moved upward to cause the contactor to be mistakenly turned on.

[0061] Only in the state of the contactor being disconnected, the electromagnetic module 722 is powered, which can avoid the possibility of the contactor being mistakenly turned on, and has higher safety.

[0062] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A DC contactor having high insulation withstand voltage, comprising an arc chute and a conducting post, the conducting post extending into the interior of the arc chute, characterized by: The inside of the arc extinguishing cover is further provided with a moving contact plate and an insulating rod group seat, the moving contact plate is driven to move by the insulating rod group seat, the moving contact plate is in contact with or separated from the conducting contact post, and the on-off control of the contactor is realized. The inner wall of the arc extinguishing cover is fixedly provided with an inner cover platform, the insulating rod group seat is provided with an extendable and retractable extension pin, and the lower portion of the insulating rod group seat is provided with a control push tube. The axial movement of the control push tube can drive the insulating rod group seat to move, and the control push tube and the insulating rod group seat can be actively separated. When the extension pin is extended in the contact state of the moving contact plate and the conducting contact post, the extension pin is limited and clamped on the upper portion of the inner cover platform. At this time, the control push tube and the insulating rod group seat are actively separated, and the moving contact plate and the conducting contact post remain in contact.

2. The DC contactor with high insulation withstand voltage according to claim 1, characterized in that: The two sides of the insulating rod group seat are fixedly provided with a rib structure, a lateral groove is formed at the positions of the two sides of the insulating rod group seat below the rib structure, and a bottom groove is formed at the bottom of the insulating rod group seat. The rib structure, the lateral groove and the bottom groove are matched to increase the creepage length of the moving contact plate to the control push tube. The bottom of the arc extinguishing cover is provided with a PC insulating sheet.

3. The DC contactor with high insulation withstand voltage according to claim 1, characterized in that: The insulating rod group seat is provided with an extension cavity hole, the extension pin is inserted into the inside of the extension cavity hole, and the extension pin is in sealing contact with the inner wall surface of the extension cavity hole. The insulating rod group seat is further provided with an air pressure flow channel, a center butt joint groove is formed at the center position of the lower surface of the insulating rod group seat, and the center butt joint groove is communicated with the extension cavity hole through the air pressure flow channel. The upper end of the control push tube is inserted into the inside of the center butt joint groove, and the outer surface of the control push tube is in sealing contact with the inner wall surface of the center butt joint groove.

4. The DC contactor with high insulation withstand voltage according to claim 3, characterized in that: The inner wall surface of the center butt joint groove is provided with an annular lock groove, the sidewall of the control push tube is provided with a pipe wall lock block, and the pipe wall lock block and the inner wall of the control push tube are fixedly connected with a lock block spring piece. The lock block spring piece applies an elastic driving force to the pipe wall lock block, so that the pipe wall lock block has a tendency to move back to the inside of the control push tube.

5. The DC contactor with high insulation withstand voltage according to claim 4, characterized in that: The inside of the control push tube is further provided with a control inner shaft, the control inner shaft can move axially, and when the control inner shaft moves to the corresponding position of the pipe wall lock block, the pipe wall lock block can move outward by extruding the lock block spring piece. At this time, the pipe wall lock block is clamped in the annular lock groove, so that the insulating rod group seat and the control push tube are relatively locked. The inner wall surface of the control push tube is fixedly provided with an inner wall ring convex, the control inner shaft is limited and supported by the inner wall ring convex, and the control inner shaft is located at the axis position of the control push tube. When the control push tube is inserted into the inside of the center butt joint groove, the pressure in the extension cavity hole is changed by the pressure change in the inside of the control push tube, so as to control the extension and retraction of the extension pin.

6. The DC contactor with high insulation withstand voltage according to claim 5, characterized in that: The lower end of the control push tube is provided with a sealing ring sleeve, the control inner shaft passes through the sealing ring sleeve, and the control inner shaft and the sealing ring sleeve are in sealing contact. The lower end of the sealing ring sleeve is fixedly provided with a driving frame body, and the outside of the driving frame body is provided with a limiting cover. The limiting cover limits the rotation of the driving frame body, so that the driving frame body can only drive the control inner shaft to move axially.

7. The DC contactor with high insulation withstand voltage according to claim 6, characterized in that: The driving frame body is provided with a screw rod shaft in screwing mode, the screw rod shaft can drive the driving frame body to move along the axial direction of the control inner shaft when rotating, the screw rod shaft is provided with a micro motor for driving the screw rod shaft to rotate at the end, the outer part of the limiting cover is fixedly provided with a motor mounting cylinder, and the micro motor is fixedly mounted in the inner part of the motor mounting cylinder.

8. The DC contactor with high insulation withstand voltage according to claim 5, characterized in that: The surface of the control push tube is communicated with a flexible air pipe, and the other end of the flexible air pipe is communicated with a variable pressure cavity pipe. The inside of the variable pressure cavity pipe is provided with a cavity pipe piston, the inside of the variable pressure cavity pipe generates positive pressure or negative pressure through the axial movement of the cavity pipe piston, and then the inside pressure of the control push tube is changed and controlled through the transmission of the flexible air pipe.

9. The DC contactor with high insulation withstand voltage according to claim 8, characterized in that: The cavity pipe piston is embedded with a one-way beam valve, the one-way beam valve remains closed when the inside of the variable pressure cavity pipe is under positive pressure, and the one-way beam valve performs flow limiting and inhales air when the inside of the variable pressure cavity pipe is under negative pressure. The cavity pipe piston is provided with a cavity pipe spring above, the cavity pipe piston is fixedly provided with a connecting frame below, the connecting frame is fixedly provided with a magnetic attraction ring outside, the magnetic attraction ring is provided with an electromagnet module above, the electromagnet module can generate magnetic force and attract the magnetic attraction ring to move upward after being powered on, at this time, the cavity pipe piston moves upward by overcoming the elastic support force of the cavity pipe spring, so that the inside of the variable pressure cavity pipe is under positive pressure.

10. The DC contactor with high insulation withstand voltage according to claim 1, characterized in that: The outside of the control push tube is fixedly provided with a moving iron core, the moving iron core is provided with an iron core spring above, and the moving iron core is provided with a control coil outside, the control coil can exert a magnetic driving force on the moving iron core after being powered on, so that the moving iron core moves axially by overcoming the elastic force of the iron core spring.

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