Direct-current contactor capable of executing high-current breaking for multiple times

Abstract

A direct current contactor capable of executing large current breaking for multiple times comprises a shell, a driving system, a contact system, an electronic ignition assembly and a telescopic action execution assembly. The action execution assembly is arranged in the shell corresponding to the movable contact plate; the electronic ignition assembly is arranged at the top of the shell corresponding to the action execution assembly; the electronic ignition assembly comprises an electronic ignition tube shell and at least two electronic ignition tubes, and an exhaust channel communicated with the exterior of the shell is formed in the shell wall of the electronic ignition tube shell. The action execution assembly is in sealing contact with the inner wall of the electronic ignition tube shell, and when the contact system is normally switched on and switched off, one end of the action execution assembly located in the electronic ignition tube shell seals the exhaust channel; in a normal working state, the action execution assembly and the electronic ignition assembly do not act, and the driving system drives the contact plate to move, so that the contact system performs normal opening and closing. Through the multiple independent electronic ignition tubes and the exhaust channels, multiple times of large-current breaking are achieved, and the breaking capacity and the utilization rate of the contactor are improved.

Description

Technical Field

[0001] This invention relates to the field of circuit protection, specifically to a DC contactor capable of repeatedly interrupting large currents for circuit protection. Background Technology

[0002] Currently, overload in DC contactors is resolved by the series-connected fuses (or circuit breakers) blowing. If the fuse or circuit breaker does not blow in time, the contactor may explode, and the continuing arc after the explosion could ignite the contactor. If the fuse blows in time, the entire main circuit will be disconnected, requiring the fuse to be removed and replaced during maintenance, increasing operating costs. To solve this problem, an electronic ignition tube is integrated into the DC contactor. Under normal operating conditions, the contactor opens and closes normally. When there is an overload current in the main circuit, the electronic ignition tube activates, forcibly driving the contact system to open with a large distance. However, this type of contactor with an integrated electronic ignition tube can only interrupt a large current once. Moreover, after interruption, due to the pressure of the high-pressure gas, it is difficult for the contactor to reset and interrupt normally, resulting in a reduced service life and decreased utilization rate. Summary of the Invention

[0003] The purpose of this invention is to provide a DC contactor capable of performing multiple high-current interruptions. By setting multiple electronic ignition tubes and exhaust port structures, and in conjunction with a retractable actuation component, it can be reset after performing multiple high-current interruptions and perform opening and closing operations under normal working conditions.

[0004] To achieve the above objectives, the present invention provides a DC contactor capable of repeatedly performing high-current interruption, comprising a housing, a drive system, a contact system, an electronic ignition assembly, and a retractable actuation assembly; the contact system comprises a stationary contact and a moving contact plate, and the drive system drives the moving contact plate to move, thereby enabling the contact system to perform opening and closing operations under normal operating conditions;

[0005] The motion execution component is disposed in the housing corresponding to the movable contact plate; the electronic ignition component is disposed on the top of the housing corresponding to the motion execution component;

[0006] The electronic ignition assembly includes an electronic ignition tube housing and at least two independent electronic ignition tubes disposed in the electronic ignition tube housing. An exhaust hole communicating with the outside of the housing is provided on the shell wall of the electronic ignition tube housing to form an exhaust channel.

[0007] One end of the action execution component is located inside the electronic ignition tube housing and is in sealed contact with the inner wall of the electronic ignition tube housing, while the other end is located outside the electronic ignition tube housing and is arranged corresponding to the moving contact plate. When the contact system is normally opening and closing, one end of the action execution component located inside the electronic ignition tube housing closes the exhaust channel.

[0008] In normal working condition, the action execution component and the electronic ignition component do not operate, and the drive system drives the moving contact plate to move, so that the contact system can perform normal opening and closing.

[0009] When there is an overcurrent in the main circuit, one of the electronic ignition tubes in the electronic ignition assembly activates according to the received trigger signal, releasing high-pressure gas as a driving force to drive the actuation component to displace along the inner wall of the electronic ignition tube housing, driving the moving contact plate to displace away from the stationary contact, thus performing a large-distance opening. During the opening process, the actuation component is compressed or stretched to generate elastic force. The actuation component located in the electronic ignition tube housing opens the exhaust channel, and the high-pressure gas released by the electronic ignition tube is discharged to the outside of the housing through the exhaust channel. When the gas pressure in the electronic ignition tube housing is less than the sum of the elastic force of the actuation component and the gas pressure in the cavity where the contact system is located, the actuation component and the moving contact plate reset, and the moving contact plate resets to the normal opening position.

[0010] Preferably, the electronic ignition assembly further includes a sleeve, which is nested within the electronic ignition tube housing and conforms to the inner wall of the electronic ignition tube housing. An exhaust notch is provided at the end of the sleeve away from the electronic ignition tube, and the exhaust notch communicates with the exhaust hole to form the exhaust channel. One end of the actuation component located within the electronic ignition tube housing is disposed within the sleeve and is in sealed contact with the inner wall of the sleeve. During normal opening and closing of the contact system, the actuation component closes the exhaust notch.

[0011] Preferably, the end face of the sleeve facing the electronic ignition tube is partially closed, and the partially closed end face is configured as an arc-shaped structure.

[0012] Preferably, the electronic ignition assembly is snap-fitted to the housing.

[0013] Preferably, the actuation component includes a retractable support and a push rod assembly. The support has a hollow structure, with one end sealed to the sealed cavity where the contact system is located, and the other end located in the housing of the electronic ignition tube. The push rod assembly passes through the support, with one end of the push rod assembly facing the electronic ignition tube located between the support and the electronic ignition tube. The push rod assembly passes through the end of the support, and one end of the push rod assembly located in the housing of the electronic ignition tube is in sealed contact with the housing of the electronic ignition tube. When the contact system is normally opening and closing, the push rod assembly closes the exhaust channel. The other end of the push rod assembly passes through the support and enters the sealed cavity where the contact system is located, corresponding to the moving contact plate. In normal operation, a gap is maintained between the push rod assembly and the moving contact plate.

[0014] Preferably, an elastic element for buffering the impact energy of the push rod assembly is sleeved on the outer periphery of the push rod assembly located in the support member.

[0015] Preferably, the elastic element includes at least one disc spring, and at least one washer is provided at the disc spring.

[0016] Preferably, the support member is a corrugated pipe with supporting strength.

[0017] Preferably, a partition is provided in the housing to divide the interior of the housing into two cavities, with the drive system and the contact system located in different cavities; an insulating sealing assembly is provided in the cavity where the contact system is located, and the sealing assembly is sealed to the partition to form a sealed cavity; one end of the moving contact plate of the contact system and one end of the stationary contact plate that contacts the moving contact plate are respectively located in the sealed cavity; one end of the electronic ignition assembly passes through the housing and abuts against the sealing assembly, one end of the support member is sealed on the sealing assembly, and the other end is located in the housing of the electronic ignition tube of the electronic ignition assembly; one end of the push rod assembly passes through the sealing assembly and is located in the sealed cavity and is positioned corresponding to the moving contact plate, and the other end of the push rod assembly is located in the housing of the electronic ignition tube; the sealed cavity is filled with inert gas.

[0018] Preferably, the moving contact plate is mounted on the moving contact plate support assembly, which is connected to the drive system. The drive system drives the moving contact plate support assembly to open and close the circuit breaker along with the moving contact plate.

[0019] Preferably, a magnetic steel frame is provided between the side of the sealing assembly and the housing, and a permanent magnet is provided on the magnetic steel frame.

[0020] The DC contactor of the present invention is equipped with at least two electronic ignition tubes through an electronic ignition assembly, and is also provided with an exhaust port, so that the DC contactor has the ability to interrupt high current multiple times (forced opening capability) without affecting the normal opening and closing of the DC contactor; and there is no need to repair the contactor or replace parts.

[0021] The electronic ignition assembly is snap-fitted to the housing, facilitating replacement of the assembly after all ignition tubes have activated, thus reducing operating costs. Therefore, apart from the ignition tubes, which are single-use components, all other parts in the contactor are reusable.

[0022] By integrating an electronic ignition component into the contactor and incorporating multiple electronic ignition tubes, the contactor itself has the ability to break overload current. This avoids the structure of contactor-fuse protection in series with fuses, as well as the matching problem between contactor and fuse. Compared with the current contactor-fuse-in-series structure, this reduces the installation volume and improves product integration and service life.

[0023] The contactor of this invention has a faster high-current breaking speed. The breaking capacity of the contactor is improved by filling the sealed cavity with inert gas, and it can perform repeated breaking. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural diagram of the DC contactor of the present invention.

[0025] Figure 2 yes Figure 1 A schematic diagram of the structure viewed in cross-section along the electronic ignition tube and perpendicular to the line connecting the two stationary contacts.

[0026] Figure 3 yes Figure 1 A schematic diagram of the structure viewed in cross-section along the line connecting the centers of the two stationary contacts.

[0027] Figure 4 This is a three-dimensional structural diagram of the electronic ignition assembly.

[0028] Figure 5 This is a top view of the electronic ignition assembly.

[0029] Figure 6 This is a cross-sectional view of the exhaust port of the electronic ignition assembly.

[0030] Figure 7 This is a schematic diagram of the outer shell structure of the electronic ignition tube.

[0031] Figure 8 This is a schematic diagram of the sleeve structure.

[0032] Figure labels;

[0033] 1. Electronic ignition tube; 2. Electronic ignition tube housing; 3. Push rod head; 4. Push rod; 5. Support component; 6. Gasket; 7. Disc spring; 8. Adapter component; 9. Piston; 10. Sealing assembly; 11. Moving contact plate support assembly; 12. First housing; 13. Sleeve; 14. Moving iron core; 15. Coil frame; 16. Second housing; 17. Stationary contact; 18. Moving contact plate; 19. Permanent magnet; 20. Magnet frame; 21. Fixing sleeve; 22. Buckle; 23. Through hole; 24. Nested ring wall; 25. Exhaust groove; 26. Exhaust hole; 27. Exhaust notch. Detailed Implementation

[0034] The present invention provides a DC contactor capable of repeatedly performing high-current interruption, comprising a housing, a drive system, a contact system, an electronic ignition assembly, and a retractable actuation assembly; the contact system comprises a stationary contact and a moving contact plate, and the drive system drives the moving contact plate to move, thereby enabling the contact system to perform opening and closing operations under normal operating conditions.

[0035] The motion execution component and the corresponding moving contact plate are located inside the housing; the electronic ignition component and the corresponding motion execution component are located on the top of the housing.

[0036] The electronic ignition assembly includes an electronic ignition tube housing and at least two independent electronic ignition tubes disposed in the electronic ignition tube housing. An exhaust port communicating with the outside of the housing is provided on the shell wall of the electronic ignition tube housing to form an exhaust channel.

[0037] One end of the action execution component is located inside the electronic ignition tube housing and is in sealed contact with the inner wall of the electronic ignition tube housing. The other end is located outside the electronic ignition tube housing and is set corresponding to the moving contact plate. When the contact system is normally opening and closing, the end of the action execution component located inside the electronic ignition tube housing closes the exhaust channel.

[0038] In normal working condition, the action execution component and the electronic ignition component do not operate, and the drive system drives the moving contact plate to move, so that the contact system can perform normal opening and closing.

[0039] When there is an overcurrent in the main circuit, one of the electronic ignition tubes in the electronic ignition assembly activates according to the received trigger signal, releasing high-pressure gas as a driving force to drive the actuation component to move along the inner wall of the electronic ignition tube housing, and drive the moving contact plate to move away from the stationary contact, thus performing a large-distance opening. During the opening process, the actuation component is compressed or stretched to generate elastic force. The actuation component located in the electronic ignition tube housing opens the exhaust channel, and the high-pressure gas released by the electronic ignition tube is discharged to the outside of the housing through the exhaust channel. When the gas pressure in the electronic ignition tube housing is less than the sum of the elastic force of the actuation component and the gas pressure in the cavity where the contact system is located, the actuation component and the moving contact plate reset, and the moving contact plate resets to the normal opening position.

[0040] The following describes preferred embodiments in detail with reference to the accompanying drawings. The directional terms used are for reference only and do not constitute a limitation on the technical solution of this invention.

[0041] The present invention relates to a DC contactor capable of repeatedly performing high-current interruptions, see [link / reference]. Figures 1 to 3 It includes a housing, and a contact system, a drive system, an actuation component, and an electronic ignition component housed within the housing. The drive system drives the contact system to open and close normally. In the event of an overload current, the electronic ignition component releases the driving force, driving the actuation component to displace. The displacement energy of the actuation component forces the contact system to open at a large distance, thus disconnecting the circuit in the event of an overload current.

[0042] In this embodiment, the outer casing is formed by vertically joining a hollow first casing 12 and a second casing 16, with the first casing 12 positioned above the second casing 16. In other embodiments, the outer casing may have other structural forms, and the casing formed by joining the first casing 12 and the second casing 16 does not constitute a limitation on the outer casing. The first casing 12 and the second casing 16 are separated by a partition. The drive system is disposed in the second casing 16, while the contact system, the actuation component, and the electronic ignition component are disposed in the first casing 12.

[0043] A sealing assembly 10 is provided in the first housing 12. The sealing assembly 10 has a cover-like structure and is sealed to the partition, forming a sealed cavity between the sealing assembly 10 and the partition. The sealing assembly 10 is made of ceramic. A space is maintained between the side of the sealing assembly 10 and the side of the first housing 12, and the top of the sealing assembly 10 is pressed and fixed by the top of the first housing 12. A magnetic steel frame 20 is provided in the space between the side wall of the sealing assembly 10 and the side of the first housing 12, and a permanent magnet 19 is provided on the magnetic steel frame 20. The sealed cavity formed by the sealing assembly 10 and the partition is filled with an arc-extinguishing gas, such as an inert gas.

[0044] The drive system is a conventional structure for DC contactors, including a coil, coil frame 15, moving iron core 14, stationary iron core, moving guide rod, and magnetic ring. The coil is wound on the coil frame 15, and the moving iron core 14 is located in the hollow part of the coil frame 15. The stationary iron core and magnetic ring are located below the partition. One end of the moving guide rod is fixed to the moving iron core 14, and a reaction spring is provided between the moving iron core and the stationary iron core; the other end passes through the partition and is located in the sealed cavity formed by the sealing assembly 10 and the partition. During normal opening and closing, the coil is energized, and the moving iron core 14 moves with the moving guide rod, causing the contact system to close normally. When the coil is de-energized, the normal opening occurs under the action of the reaction spring or under the combined action of the reaction spring, the moving contact plate, and the moving contact plate support assembly. The drive system of the DC contactor of this invention is a conventional structure, and the specific structure can be referred to in the coil drive system of existing DC contactors. The coil drive system in existing DC contactors can all be used as the drive system of this invention.

[0045] The contact system includes a stationary contact 17, a moving contact plate 18, and a moving contact plate support assembly 11. Both the moving contact plate 18 and the moving contact plate support assembly 11 are located within the sealed cavity formed by the sealing assembly 10 and the partition. Two stationary contacts 17 are spaced apart at the top of the housing; one end of each contact is located outside the housing as a connection point between the contactor and an external circuit, while the other end passes through the first housing 12 and the sealing assembly 10, residing within the sealed cavity formed by the sealing assembly 10 and the partition. The contact surface between the stationary contact 17 and the sealing assembly 10 is in sealed contact.

[0046] The moving contact plate support assembly 11 is fixedly mounted on the moving guide rod located in the sealing assembly 10. The displacement of the moving guide rod causes the moving contact plate support assembly 11 to move as well. The moving contact plate support assembly includes a support base, a support bracket, a lower magnetic conductor, a moving contact plate 18, an upper magnetic conductor, a contact spring, and other structures. The support base is fixedly mounted on the moving guide rod, and the support bracket is mounted on the support base. The lower magnetic conductor, the moving contact plate, and the upper magnetic conductor are arranged on the support bracket from bottom to top. The support bracket can move relative to the support base, or the moving contact plate can move relative to the support bracket, to buffer the impact force on the moving contact plate when it closes with the stationary contact. The two ends of the moving contact plate 18 are respectively positioned corresponding to two stationary contacts 17. The above description of the structure of the moving contact plate support assembly is only a simplified description. Since the moving contact plate support assembly is existing technology for DC contactors, the structure of the moving contact plate support assembly of existing DC contactors can be used as the moving contact plate support assembly 11 of this application.

[0047] A tubular retaining sleeve 21 is integrally formed on the top outer surface of the first housing 12. The retaining sleeve 21 protrudes from the top of the first housing 12 and is located between the two stationary contacts 17. A locking hole is provided on the side wall of the retaining sleeve 21. The hollow portion of the retaining sleeve 21 penetrates the top of the first housing 12 and communicates with the interior of the first housing 12. A mounting hole penetrating the top of the sealing assembly 10 is provided on the top of the sealing assembly 10. This mounting hole is located in the top region of the sealing assembly 10 corresponding to the hollow portion of the retaining sleeve 21.

[0048] Electronic ignition assembly, see Figures 4 to 8 The system includes an electronic ignition tube 1, an electronic ignition tube housing 2, and a sleeve 13. The electronic ignition tube 1 is a gas generating device that releases high-pressure gas as a driving force upon receiving a trigger signal. The electronic ignition tube housing 2 has a tubular structure, and a buckle 22 is provided on the outer surface of the electronic ignition tube housing 2 at the corresponding snap hole position of the fixing sleeve 21. At least two electronic ignition tubes 1 are provided at the outer end of the electronic ignition tube housing 2 facing outwards. The electronic ignition tube 1 closes the outer end of the electronic ignition tube housing 2 facing outwards. The signal receiving end of the electronic ignition tube 1 is located outside the housing and can receive external trigger signals. The high-pressure gas releasing end of the electronic ignition tube 1 is located in the hollow part of the electronic ignition tube housing 2. In this embodiment, two electronic ignition tubes 1 are used. The two or more electronic ignition tubes are set independently and operate independently upon receiving trigger signals, without affecting each other. When an overload current occurs and the contact system needs to be forcibly tripped, only one electronic ignition tube can be triggered, while the others remain inactive. Once the main circuit is restored to normal, there is no need to replace the electronic ignition tubes, and the circuit can continue to be used directly. When an overload current occurs again in the main circuit, the other electronic ignition tube will be triggered, forcibly tripping the contact system. Therefore, the number of forced trips during an overload current in the main circuit depends on the number of electronic ignition tubes.

[0049] The sleeve 13 is a hollow tubular structure with both ends open. One end is partially closed, and a through hole 23 is formed on the partially closed end face for the high-pressure gas released by the electronic ignition tube 1 to pass through. The partially closed end face of the through hole 23 is set with an arc-shaped structure. The end wall of the partially closed end extends towards the electronic ignition tube 1, forming a nesting annular wall 24 that can be nested into the hollow part of the electronic ignition tube housing 2. An annular nesting groove is provided at the top of the hollow part of the electronic ignition tube housing 2 corresponding to the nesting annular wall 24. The sleeve 13 fits tightly against the inner wall of the electronic ignition tube housing 2 and is fitted into the nesting groove in the electronic ignition tube housing 2. A mechanical seal structure is formed at the top of the sleeve 13 and the electronic ignition tube housing 2 to prevent the high-pressure gas released by the electronic ignition tube 1 from entering between the electronic ignition tube housing and the sleeve, ensuring that the high-pressure gas released by the electronic ignition tube drives the contact system to perform a large-distance tripping. The electronic ignition tube 1 is located inside the outer casing groove, with its driving force release end located outside the partially closed end of the sleeve 13. The high-pressure gas released by the electronic ignition tube 1 enters the sleeve through a through hole on the partially closed end face of the sleeve 13. By providing the sleeve 13 in the electronic ignition tube housing 2, the resistance of the electronic ignition tube housing 2 to the impact of high-pressure gas is improved. When the strength of the electronic ignition tube housing 2 is sufficient to resist the impact of the high-pressure gas released by the electronic ignition tube, the sleeve 13 may not be provided.

[0050] On the inner wall of the end of the electronic ignition tube housing 2 away from the electronic ignition tube 1, an exhaust groove 25 is formed, which is connected to an exhaust hole 26 provided on the housing wall of the electronic ignition tube housing 2. The exhaust hole 26 is connected to the outside of the housing. The length direction of the exhaust groove 25 is the same as the displacement direction of the moving contact plate. At the position corresponding to the exhaust groove on the sleeve 13, an exhaust notch 27 is formed, which penetrates the inner wall of the sleeve 13. The exhaust notch 27 is connected to the exhaust groove 25, and a complete exhaust channel is formed through the exhaust notch 27, the exhaust groove 25 and the exhaust hole 26.

[0051] When the electronic ignition assembly is mounted on the first housing 12, the snap-fit ​​22 on the outer shell 2 of the electronic ignition tube of the electronic ignition assembly engages with the snap-fit ​​hole of the fixing sleeve 21 of the first housing 12, so that the electronic ignition assembly is mounted on the first housing 12 by snap-fit ​​connection, and the end of the electronic ignition assembly away from the electronic ignition tube 1 abuts against the top surface of the sealing assembly 10. The mounting hole opened on the top of the sealing assembly 10 is located in the area corresponding to the inner wall of the sleeve 13 of the electronic ignition assembly. An adapter 8 is fixedly provided on the inner wall of the sealing assembly 10, and the adapter 8 is sealed to the sealing assembly 10, sealing the mounting hole on the sealing assembly 10.

[0052] The motion execution component includes a retractable support 5 and a push rod assembly. The push rod assembly includes a push rod 4, a push rod head 3, and a piston 9.

[0053] The support member 5 has its lower end fixedly connected to the adapter 8 through the mounting hole. The support member 5 and the adapter 8 are sealed together, for example, by welding. The support member 5 is a hollow and expandable tubular structure with a certain supporting strength. In this embodiment, the support member is a corrugated metal pipe. The upper end of the support member 5 extends into the sleeve 13 of the electronic ignition assembly, and in the initial position, it passes over the exhaust notch 27 on the sleeve 13. That is, in the initial position, the upper end of the support member 5 is closer to the electronic ignition tube 1 than the end of the exhaust notch 27 facing the electronic ignition tube 1.

[0054] The push rod head 3 is disposed in the hollow part of the sleeve 13. The push rod head 3 is located between the support member 5 and the electronic ignition tube 1. One end of the push rod head 3 passes through the through hole 23 corresponding to the electronic ignition tube, so that the high-pressure gas released by the electronic ignition tube can act on the push rod head 3 along the end face of the partially closed arc structure. The other end of the push rod head 3 is sealed to the end of the support member 5, for example, by welding or adhesive bonding. The push rod head 3, the support member 5, and the support member 5 sealed to the sealing assembly 10 achieve the sealing of the mounting hole at the top of the sealing assembly 10, keeping the sealing cavity formed by the sealing assembly and the partition plate in a sealed state. A sealing ring is provided on the outer periphery of the push rod head 3 to ensure a sealed contact between the push rod head 3 and the inner wall of the sleeve 13. In the initial position, the sealed contact between the push rod head 3 and the inner wall of the sleeve 13 prevents the exhaust port 27 from communicating with the cavity between the push rod head 3 and the electronic ignition tube 1. That is, the push rod head 3 seals the exhaust port 27, preventing the exhaust hole 26 from being open. The push rod 4 is displaceably inserted through the hollow part of the support member 5. One end of the push rod 4 is fixedly connected to the push rod head 3, and the other end passes through the adapter 8 and is fixedly connected to the piston 9. The piston 9 is located in the sealed cavity formed by the sealing assembly 10 and the partition. The piston 9 is positioned corresponding to the moving contact plate support assembly. Under normal flow conditions, the piston 9 does not affect the opening and closing of the circuit between the moving contact plate and the stationary contact, and the DC contactor operates normally. The piston 9 is made of insulating material. To further reduce the size, the end face of the piston 9 corresponding to the moving contact plate is set with a flared structure to form a clearance space to ensure the normal displacement of the moving contact plate.

[0055] A disc spring 7 and a washer 6 are fitted onto the push rod 4 within the support member 5. The disc spring 7 and washer 6 are supported by a connector 8. Multiple disc springs 7 and washer 6 can be provided. The disc spring 7 buffers the impact energy generated when the actuator moves. The cutting time can be adjusted by adjusting the parameters of the washer and disc spring. The more washer 7s, the faster the piston cuts off the main circuit and the stronger the breaking capacity; the more disc spring 6s, the better the protection of the entire moving contact plate support assembly and the better the connection of the contactor main circuit.

[0056] Working principle:

[0057] Under normal operating conditions, the drive system drives the contact system to open and close normally, the actuation component and the electronic ignition component do not operate, and the actuation component closes the exhaust port, that is, closes the exhaust passage.

[0058] When there is an overcurrent and forced tripping is required, the first electronic ignition tube activates according to the received trigger signal, releasing high-pressure gas. The high-pressure gas passes through the through hole 23 along the closed end face of the sleeve and acts on the push rod head 3, driving the push rod head 3, along with the push rod 4 and piston 9, to move linearly towards the moving contact plate assembly along the inner wall of the sleeve in the electronic ignition tube housing 2. The piston 9 abuts against the moving contact plate, causing the moving contact plate assembly, moving guide rod, and moving iron core to move together away from the stationary contact. First, the moving contact plate is moved to the normal tripping position, and then the piston 9 continues to move, further compressing the contact spring of the moving contact plate assembly, causing the moving contact plate to trip with a large opening distance from the stationary contact. The large opening distance is greater than the normal tripping distance. During the tripping process... In the middle, the support member 5 and the disc spring are compressed by the push rod head 3 respectively. The support member 5 and the disc spring buffer the impact brought by the push rod head 3. After the large opening distance is opened, the push rod head 3 is moved to the bottom of the exhaust notch 27, so that the exhaust notch 27 is exposed and the exhaust channel is opened. The high pressure gas released by the electronic ignition tube 1 is discharged to the outside of the housing along with the exhaust notch 27, reducing the gas pressure between the electronic ignition tube and the push rod head in the electronic ignition tube housing. When the gas pressure between the electronic ignition tube and the push rod head 3 is reduced to less than the sum of the elastic force of the support member 5, the disc spring 7 and other elastic members and the gas pressure in the sealed cavity where the contact system is located, the moving contact plate assembly and the moving iron core are reset to the initial position of the moving contact plate assembly when the normal opening is performed under the action of the elastic force. After resetting to the initial position, the drive system and contact system remain in normal condition and can continue to perform opening and closing operations under normal working conditions. When the main circuit experiences an overload current again, the other electronic ignition tubes are triggered, repeating the above-mentioned large-distance opening and reset operations. Once all electronic ignition tubes have been triggered, the contactor only has the ability to perform normal opening and closing operations, but it does not have the ability to force the contact system to open with a large distance when encountering an overload current. At this point, replacing the electronic ignition components will restore the contactor's ability to force opening.

Claims

1. A DC contactor capable of repeatedly interrupting large currents, characterized in that, It includes a housing, a drive system, a contact system, an electronic ignition assembly, and a retractable actuation assembly; the contact system includes a stationary contact and a moving contact plate, and the drive system drives the moving contact plate to move, so that the contact system can open and close the circuit breaker under normal operating conditions; The motion execution component is disposed in the housing corresponding to the movable contact plate; the electronic ignition component is disposed on the top of the housing corresponding to the motion execution component; The electronic ignition assembly includes an electronic ignition tube housing and at least two independent electronic ignition tubes disposed in the electronic ignition tube housing. An exhaust hole communicating with the outside of the housing is provided on the shell wall of the electronic ignition tube housing to form an exhaust channel. One end of the action execution component is located inside the electronic ignition tube housing and is in sealed contact with the inner wall of the electronic ignition tube housing, while the other end is located outside the electronic ignition tube housing and is arranged corresponding to the moving contact plate. When the contact system is normally opening and closing, one end of the action execution component located inside the electronic ignition tube housing closes the exhaust channel. In normal working condition, the action execution component and the electronic ignition component do not operate, and the drive system drives the moving contact plate to move, so that the contact system can perform normal opening and closing. When there is an overcurrent in the main circuit, one of the electronic ignition tubes in the electronic ignition assembly activates according to the received trigger signal, releasing high-pressure gas as a driving force to drive the actuation component to move along the inner wall of the electronic ignition tube housing, driving the moving contact plate to move away from the stationary contact, thus performing a large-distance opening circuit breaker. During the opening process, the actuation component is compressed or stretched to generate elastic force. The actuation component located in the electronic ignition tube housing opens the exhaust channel, and the high-pressure gas released by the electronic ignition tube is discharged to the outside of the housing through the exhaust channel. When the gas pressure in the housing of the electronic ignition tube is less than the sum of the elastic force of the actuation component and the gas pressure in the cavity where the contact system is located, the actuation component and the moving contact plate are reset, and the moving contact plate is reset to the normal open position.

2. The DC contactor according to claim 1, characterized in that, The electronic ignition assembly also includes a sleeve, which is nested in the electronic ignition tube housing and fits against the inner wall of the electronic ignition tube housing. An exhaust notch is provided at the end of the sleeve away from the electronic ignition tube, and the exhaust notch communicates with the exhaust hole to form the exhaust channel. One end of the actuation component located in the housing of the electronic ignition tube is disposed in the sleeve and is in sealed contact with the inner wall of the sleeve; when the contact system is normally opening and closing, the actuation component closes the exhaust port.

3. The DC contactor according to claim 2, characterized in that, The sleeve is partially closed at one end facing the electronic ignition tube, and the partially closed end face is configured as an arc-shaped structure.

4. The DC contactor according to claim 1, characterized in that, The electronic ignition assembly is snapped together with the housing.

5. The DC contactor according to claim 1, characterized in that, The actuation component includes a retractable support and a push rod assembly. The support has a hollow structure, with one end sealed to the sealed cavity where the contact system is located, and the other end located in the outer shell of the electronic ignition tube. The push rod assembly passes through the support, with one end of the push rod assembly facing the electronic ignition tube located between the support and the electronic ignition tube. The push rod assembly passes through the end of the support, and one end of the push rod assembly located in the outer shell of the electronic ignition tube is in sealed contact with the outer shell of the electronic ignition tube. When the contact system is normally opening and closing, the push rod assembly closes the exhaust channel. The other end of the push rod assembly passes through the support member and enters the sealed cavity where the contact system is located, and is set corresponding to the moving contact plate. In normal operation, a gap is maintained between the push rod assembly and the moving contact plate.

6. The DC contactor according to claim 5, characterized in that, An elastic element is provided around the outer periphery of the push rod assembly located in the support member to buffer the impact energy of the push rod assembly.

7. The DC contactor according to claim 6, characterized in that, The elastic element includes at least one disc spring, and at least one washer is provided at the disc spring.

8. The DC contactor according to claim 5, characterized in that, The support component is a corrugated pipe with supporting strength.

9. The DC contactor according to claim 5, characterized in that, A partition is provided in the housing to divide the interior of the housing into two cavities, with the drive system and the contact system located in different cavities. An insulating sealing assembly is provided in the cavity where the contact system is located, and the sealing assembly is sealed to the partition to form a sealed cavity. The moving contact plate of the contact system and one end of the stationary contact that contacts the moving contact plate are located in the sealed cavity. One end of the electronic ignition assembly passes through the housing and abuts against the sealing assembly. One end of the support member is sealed on the sealing assembly, and the other end is located in the housing of the electronic ignition tube of the electronic ignition assembly. One end of the push rod assembly passes through the sealing assembly, is located in the sealed cavity, and is positioned corresponding to the moving contact plate. The other end of the push rod assembly is located in the housing of the electronic ignition tube. The sealed cavity is filled with inert gas.

10. The DC contactor according to claim 9, characterized in that, The moving contact plate is mounted on the moving contact plate support assembly, which is connected to the drive system. The drive system drives the moving contact plate support assembly to open and close the circuit breaker along with the moving contact plate.

11. The DC contactor according to claim 9, characterized in that, A magnetic steel frame is provided between the side of the sealing assembly and the housing, and a permanent magnet is provided on the magnetic steel frame.

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