Excitation integrated contactor

Abstract

An excitation integrated contactor comprises a shell, a driving system, a contact system, an electronic ignition assembly and an excitation execution piece, and the contact system is located in a sealed cavity; the electronic ignition assembly comprises an electronic ignition device and an electronic ignition device shell, the electronic ignition device shell penetrates through the shell to abut against the sealing cavity, the sealing element penetrates through the electronic ignition device shell, the excitation execution part penetrates through the sealing element to seal one end of the sealing element, and the other end of the sealing element is in sealed connection with the sealing cavity; one end of the excitation executing part corresponds to the movable contact plate, the other end of the excitation executing part corresponds to the electronic ignition device, a gap between the electronic ignition assembly and the shell is filled with a first sealing part, and the first sealing part seals a gap between the shell of the electronic ignition device and the sealing cavity; in a normal working state, a gap is reserved between the excitation execution piece and the movable contact plate. By arranging the sealing element and the first sealing element, the overall sealing performance of the contactor and the mechanical strength of the shell are improved.

Description

Technical Field

[0001] This invention relates to the field of switching devices for circuits, specifically to contactors with integrated excitation and disconnection functions. Background Technology

[0002] Currently, the protection measures for DC circuit systems (especially wind power, photovoltaic, energy storage and electric vehicles) are fuses and contactors. The contactor is mainly responsible for connecting and disconnecting the rated load and current below. However, due to the limited protection range of the fuse, the contactor sometimes needs to disconnect a certain overload current. The contactor has limited ability to disconnect large currents. When the fault current is too large, it will cause the contacts to weld together or even explode.

[0003] The Chinese patent application CN 222514865 U filed by the applicant discloses an integrated excitation contactor, including a drive system and a contact system, and also includes an integrated excitation source, an excitation action component, and a sealing element. The sealing element is set for a moving contact, with one end fixed and the other end being a free end. The excitation action component is fixedly connected to the free end of the sealing element. The excitation source drives the excitation action component to displace, forcibly causing the contact system to open. At the same time, it causes the sealing element to undergo elastic deformation that can be restored to its initial position. When the arc is extinguished and the driving force is reduced, the sealing element, the moving contact, and the excitation action component are all reset to their initial positions when normally open. The advantage lies in its ability to forcibly disconnect under overload current, and the contactor can resume normal function after the overload current disappears. However, in actual use, it still has defects. When the excitation source is activated, the contactor's sealing performance is not strong, which causes the pressure of the high-pressure gas released by the excitation source to drop relatively quickly. Before the arc is completely extinguished, due to the leakage of high-pressure gas, the end of the moving contact away from the stationary contact is subjected to the force of the leaking gas, as well as the reduction of gas pressure on the excitation actuation component. Combined with the elasticity of the sealing element, the guide rod carrier is reset, causing the moving contact to lose its force and displace towards the stationary contact. When the drive coil is still energized, the moving contact and the stationary contact re-conduct, causing the circuit to be connected and resulting in significant losses. Summary of the Invention

[0004] The purpose of this invention is to provide an integrated excitation contactor that, by improving the sealing performance of the contactor, ensures that the high-pressure gas released from the excitation source remains at a high pressure, providing a continuous force to the forcibly disconnected moving contact, preventing the moving contact from re-contacting the stationary contact, and improving the working reliability of the contactor.

[0005] To achieve the above objectives, the present invention provides an integrated contactor, comprising a housing, a drive system and a contact system located within the housing, wherein the contact system is located in a sealed chamber;

[0006] The contact system includes a stationary contact and a moving contact plate. The stationary contact passes through the top of the housing and the sealed chamber, with one end located outside the housing and the other end located inside the sealed chamber. The moving contact plate is located inside the sealed chamber.

[0007] An electronic ignition assembly is installed on the top of the housing. The electronic ignition assembly includes an electronic ignition device and a tubular electronic ignition device housing. The electronic ignition device is fixedly installed in one end of the electronic ignition device housing and the end is closed. The electronic ignition device housing passes through the housing and abuts against the top of the sealed chamber.

[0008] A sealing element is provided in the housing of the electronic ignition device. The sealing element is retractable and has a certain supporting strength. One end of the sealing element is sealed and fixedly connected to the sealing chamber, and the other end is set towards the electronic ignition device.

[0009] The actuator is displaced through the sealing element, with one end located in the sealing chamber and corresponding to the moving contact plate, and the other end fixedly connected to the end of the sealing element facing the electronic ignition device and closed thereoff. The end of the actuator fixedly connected to the sealing element is in sealed contact with the inner wall of the electronic ignition device housing. The sealing element provides support for the actuator and defines its initial position.

[0010] A first sealing element is filled in the gap between the contact surface of the electronic ignition device housing and the housing, and the first sealing element seals the gap between the electronic ignition device housing and the housing, as well as the gap between the electronic ignition device housing and the sealed chamber.

[0011] In normal operation, a gap is maintained between the actuator and the moving contact plate, and the drive system drives the contact system to open and close. When there is an overload current, the electronic ignition device acts according to the received trigger signal, releases high-pressure gas as a driving force, drives the actuator to move along the inner wall of the electronic ignition device housing, and the actuator drives the moving contact plate to move away from the stationary contact, thus opening the circuit with a large gap.

[0012] Preferably, the electronic ignition component is connected to the housing via a snap-fit ​​connection.

[0013] Preferably, a second seal is provided between the outer casing of the electronic ignition device and the sealed chamber.

[0014] Preferably, a groove is provided on the end face of the housing of the electronic ignition device, and the second seal is disposed in the groove.

[0015] Preferably, the sealing element is a bellows.

[0016] Preferably, the gap between the stationary contact and the contact surface of the housing is filled with the first seal.

[0017] Preferably, the first seal is filled in the gap between the outer shell and the sealed chamber.

[0018] Preferably, the actuating component includes a piston, a first moving guide rod, and a guide rod carrier. The piston is fixedly connected to one end of the sealing element facing the electronic ignition device. The guide rod carrier is located in the sealing chamber corresponding to the moving contact plate. The first moving guide rod passes through the sealing element, and its two ends are fixedly connected to the piston and the guide rod carrier, respectively.

[0019] Preferably, the first moving guide rod and the guide rod carrier are integrally formed.

[0020] Preferably, a partition is provided in the housing to isolate the contact system from the drive system, and a sealing assembly is provided on the partition, the sealing assembly and the partition forming the sealed chamber.

[0021] Preferably, a magnetic steel frame is provided between the side wall of the sealing assembly and the outer shell, and a permanent magnet is provided on the magnetic steel frame.

[0022] Preferably, the gap is filled with epoxy resin to form the first seal.

[0023] The excitation integrated contactor of the present invention improves the sealing performance of the space between the electronic ignition assembly and the excitation actuator by filling the gap between the contactor housing and the electronic ignition device housing, and the gap between the stationary contact and the housing with epoxy resin to form a first sealing element. This prevents the high-pressure propellant gas released by the electronic ignition device from leaking outward and enhances the insulation between the contacts. Filling the sealed chamber of the contactor with epoxy resin between it and the housing not only improves the sealing effect of the sealed chamber against inert gases, but also improves the overall mechanical strength. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the external structure.

[0025] Figure 2 This is a schematic diagram of the internal structure.

[0026] Figure 3 This is a schematic diagram of the electronic ignition device.

[0027] Figure 4 This is a schematic diagram of the installation structure of the electronic ignition device and its housing.

[0028] Figure 5 This is a top view of the structure of the first sealing element.

[0029] Figure label:

[0030] 1. Electronic ignition device housing; 2. Electronic ignition device; 3. Piston; 4. First moving guide rod; 5. Sealing element; 6. Stationary contact; 7. Magnet frame; 8. Guide rod carrier; 10. Moving contact plate; 11. Moving contact plate bracket; 12. Moving iron core; 13. Drive coil; 14. Housing; 15. Sealing assembly; 16. Permanent magnet; 17. First seal; 18. Snap hole; 19. Snap buckle; 20. First seal. Detailed Implementation

[0031] The excitation integrated contactor of the present invention includes a housing, and a drive system and a contact system located in the housing, wherein the contact system is located in a sealed chamber;

[0032] The contact system includes a stationary contact and a moving contact plate. The stationary contact passes through the top of the housing and the sealed chamber, with one end located outside the housing and the other end located inside the sealed chamber; the moving contact plate is located in the sealed chamber.

[0033] An electronic ignition assembly is installed on the top of the housing. The electronic ignition assembly includes an electronic ignition device and a tubular electronic ignition device housing. The electronic ignition device is fixedly installed in one end of the electronic ignition device housing and the end is closed. The electronic ignition device housing passes through the housing and abuts against the top of the sealed chamber.

[0034] A sealing element is provided in the housing of the electronic ignition device. The sealing element is retractable and has a certain supporting strength. One end of the sealing element is sealed and fixedly connected to the sealing chamber, and the other end is set towards the electronic ignition device.

[0035] The actuator is displaced through the sealing element. One end of the actuator is located in the sealing chamber and is positioned corresponding to the moving contact plate. The other end is fixedly connected to the end of the sealing element facing the electronic ignition device and is closed. The end of the actuator fixedly connected to the sealing element is in sealed contact with the inner wall of the electronic ignition device housing. The sealing element provides support for the actuator and defines its initial position.

[0036] A first seal is filled in the gap between the contact surfaces of the electronic ignition device housing and the housing, and the first seal seals the gap between the electronic ignition device housing and the gap between the electronic ignition device housing and the sealed chamber.

[0037] In normal operation, a gap is maintained between the actuator and the moving contact plate, and the drive system drives the contact system to open and close the circuit breaker. When there is an overload current, the electronic ignition device acts according to the received trigger signal, releases high-pressure gas as the driving force, drives the actuator to move along the inner wall of the electronic ignition device housing, and drives the moving contact plate to move away from the stationary contact, thus opening the circuit breaker with a large opening distance.

[0038] 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.

[0039] This invention excites an integrated contactor, see below. Figures 1 to 5 The circuit includes a housing 14, within which a contact system and a drive system are housed. The drive system drives the contact system to open and close the circuit. The housing 14 is internally divided into two chambers by a partition, with the drive system and contact system located in different chambers separated by the partition. The drive system includes a drive coil 13 and a moving iron core 12 located in the hollow portion of the drive coil 13. One end of a push rod is fixedly mounted on the moving iron core 12, and the other end passes through the partition and is located in the chamber containing the contact system. A moving contact plate bracket 11 is mounted on the push rod, and a moving contact plate 10 is mounted on the moving contact plate bracket 11. The chamber containing the drive system also contains a stationary iron core, a magnetic ring, and other structures. For details of the drive system's structure, refer to the drive system structure of a magnetically driven contactor.

[0040] A sealing assembly 15 is provided on the partition in the chamber containing the contact system. The sealing assembly 15 has a cap-like structure and is sealed to the partition, forming a sealed chamber. The contact system is located in the sealed chamber formed by the sealing assembly 15 and the partition, and the sealed chamber is filled with inert gas for arc extinguishing. The top of the outer shell 14 presses on the top of the sealing assembly 15, and the outer shell 14 positions the sealing assembly 15. In some embodiments, the sealing assembly 15 is a ceramic cover, which is sealed and fixed to the partition to form a sealed chamber. A magnetic steel frame 7 is provided between the side wall of the sealing assembly 15 and the outer shell 14, and a permanent magnet 16 is mounted on the magnetic steel frame 7.

[0041] Two stationary contacts 6 are fixedly fixed at intervals on the top of the sealing assembly 15. The stationary contacts 6 are fixedly connected to the sealing assembly 15 by welding, sealing the contact surface between the stationary contacts 6 and the sealing assembly 15. One end of the stationary contact 6 is located in the sealed chamber, and the other end passes through the top of the housing 14 and can be connected to the external circuit of the contactor. A mounting through hole penetrating the top of the sealing assembly 15 is provided on the top of the sealing assembly 15 between the two stationary contacts 6. A mounting boss 17 is provided on the housing 14 at the mounting through hole corresponding to the sealing assembly 15. The mounting boss 17 protrudes from the top outer surface of the housing 14 and has a hollow portion that extends through the thickness of the mounting boss 17, allowing communication between the inside and outside of the housing 14. A locking hole 18 is provided on the side wall of the mounting boss 17 located on the outer side of the housing 14. The mounting boss 17 is integrally formed with the housing 14.

[0042] The electronic ignition assembly includes an electronic ignition device 2 and an electronic ignition device housing 1. The electronic ignition device housing 1 has a tubular structure. The electronic ignition device 2 is nested and fixedly installed in one end of the electronic ignition device housing 1, sealing one end of the electronic ignition device housing 1. The high-pressure gas release end of the electronic ignition device 2 is located in the electronic ignition device housing 1. The electronic ignition device 2 is a gas generator capable of producing high-pressure gas. A buckle 19 is provided at the corresponding position of the snap hole 18 on the outer periphery of the electronic ignition device housing 1. The electronic ignition assembly is installed in the hollow part of the mounting boss 17. The buckle 19 of the electronic ignition device housing 1 snaps into the snap hole 18 of the mounting boss 17 to form a snap-fit ​​structure, so that the electronic ignition assembly is installed in the mounting boss 17. The end of the electronic ignition device housing 1 away from the electronic ignition device 2 passes through the top of the housing 14 and abuts against the top of the sealing assembly 15, so that the mounting through hole of the sealing assembly 15 corresponding to the mounting boss is located in the electronic ignition device housing 1. The high-pressure gas release end of the electronic ignition device 2 faces the sealing assembly 15. To improve the sealing performance between the electronic ignition device housing 1 and the sealing assembly 15, a sealing ring (not shown) is provided between the contact surfaces of the electronic ignition device housing 1 and the sealing assembly 15 to form a second seal. Specifically, the second seal may have a groove formed on the end face of the end of the electronic ignition device housing 1 that abuts against the sealing assembly 15, with the sealing ring protruding from the groove. When the electronic ignition assembly is engaged with the mounting boss 17, the sealing ring on the electronic ignition device housing 1 is pressed tightly between the electronic ignition device housing 1 and the sealing assembly 15, forming a seal. By providing the second seal, the electronic ignition assembly and the sealing assembly 15 are sealed, preventing the high-pressure gas released by the electronic ignition device from leaking through the gap between them, thereby reducing the high-pressure gas pressure.

[0043] The inner wall of the electronic ignition device housing 1 between the high-pressure gas release end of the electronic ignition device 2 and the sealing assembly 15 is a guide structure for linear displacement.

[0044] The sealing element 5 is a hollow bellows structure made of metal, such as copper, aluminum, or an alloy, which gives it a certain degree of flexibility and sufficient support strength. The sealing element 5 is located in the housing 1 of the electronic ignition device, with one end fixedly connected to the top outer surface of the sealing assembly 15 by brazing, and the other end facing the electronic ignition device 2.

[0045] The actuator includes a first moving guide rod 4, a piston 3, and a guide rod carrier 8. The piston 3 is located within the housing 1 of the electronic ignition device and between the sealing element 5 and the electronic ignition device 2. The piston 3 and the sealing element 5 are fixedly connected to the end facing the electronic ignition device 2 in a sealed manner, such as by welding or adhesive bonding. The sealing element 5 provides support and defines the initial position of the actuator. The piston 3 and sealing element 5 seal the mounting hole at the top of the sealing assembly 15, maintaining a sealed chamber formed by the partition and sealing assembly 15, preventing leakage of the inert gas filled in the sealed chamber. The piston 3 is in sealed contact with the inner wall of the housing 1 of the electronic ignition device. This sealing contact can be achieved by either setting a sealing ring on the outer circumferential surface of the piston 3 where it contacts the inner wall of the housing 1, or by a tight fit or interference fit between the piston 3 and the inner wall of the housing 1. The guide rod carrier 8, made of insulating material, is located in the sealed chamber formed by the sealing assembly 15 and the partition plate, and is positioned corresponding to the moving contact plate 10. Under normal opening and closing conditions, a certain distance is maintained between the guide rod carrier 8 and the moving contact plate 10; that is, the guide rod carrier 8 does not affect the normal opening and closing action of the moving contact plate 10. The first moving guide rod 4 passes through the sealing element 5. One end of the first moving guide rod 4 passes through the mounting hole at the top of the sealing assembly 15 and is fixedly connected to the guide rod carrier 8 located in the sealed chamber. The other end passes through the sealing element 5 and is fixedly connected to the piston 3. The first moving guide rod 4 and the guide rod carrier 8 can be independent structures, connected by threads or other connection methods, or they can be an integrated structure, such as integral injection molding. When the electronic ignition device acts according to the received trigger signal and releases high-pressure gas, the high-pressure gas acts on the piston 3, driving the piston 3 to move linearly along the inner wall of the electronic ignition device housing 1, carrying the first moving guide rod 4 and the guide rod carrier 8 together to move and contact the moving contact plate 10, while simultaneously compressing the sealing element 5.

[0046] The gaps between the electronic ignition device housing 1 and the hollow portion of the mounting boss 17, the gaps between the stationary contact 6 and the top contact surface of the housing 14, and the gaps between the sealing assembly 15 and the housing 14 are respectively filled with epoxy resin to form a first seal 20.

[0047] The epoxy resin in the gap between the electronic ignition device housing 1 and the inner wall of the hollow part of the mounting boss 17 enters the top outer surface of the sealing assembly 15, sealing not only the gap between the electronic ignition device housing 1 and the hollow part of the mounting boss 17, but also the gap between the end face of the electronic ignition device housing 1 and the sealing assembly 15. This ensures that the high-pressure gas released by the electronic ignition device 2 is in the sealed space between the electronic ignition device housing 1, the sealing element 5, the piston 3 and the electronic ignition device 2, and will not leak.

[0048] The gap between the stationary contact 6 and the top of the housing 14 is filled with epoxy resin to seal the gap between the stationary contact and the housing 14 and prevent gas leakage from the housing 14.

[0049] Epoxy resin is filled in the gap between the sealing assembly 15 and the housing 14 to ensure the sealing of the sealing assembly and the partition, improve the sealing performance of the sealing assembly and the partition, prevent leakage of the filled inert gas, and at the same time improve the sealing strength of the housing 14 and the sealing chamber where the contact system is located, improve the mechanical strength of the sealing assembly 15 and the housing 14, and improve the mechanical strength of the outer surface of the sealing assembly 15 and the welded positions on the housing 14.

[0050] Working principle:

[0051] Under normal conditions, the drive system drives the contact system to open and close the circuit normally, and the guide rod carrier 8 and the electronic ignition device 2 do not operate.

[0052] When there is an overload current and forced tripping is required, the electronic ignition device 2 operates according to the received trigger signal, releasing high-pressure gas to act on the piston 3, driving the piston 3 to move the first moving guide rod 4 and the guide rod carrier 8 in a straight line along the inner wall of the electronic ignition device housing 1. The guide rod carrier 8 abuts against the moving contact plate 10, causing the moving contact plate 10, the moving contact plate support 11, the push rod, and the moving iron core to move away from the stationary contact 6. When the displacement reaches the normal tripping position, the moving iron core, the push rod, and the moving contact plate support 11 stop moving, and the guide rod carrier 8 continues to abut against the moving contact plate 10, further compressing the contact spring, forming a large opening distance between the moving contact plate 10 and the stationary contact 6 that is greater than the normal tripping distance. Meanwhile, because the first seal 20 seals the gap between the electronic ignition assembly and the housing 14, and seals the contact surface between the sealing element 5 and the sealing assembly 15, the electronic ignition device and the piston 3 are always kept under high pressure. Therefore, after the large opening distance is opened, the high pressure gas keeps pressing against the piston 3, so that the guide rod carrier 8 keeps pressing against the moving contact plate 10 and will not rebound. It is always in the large opening distance opening state, which improves the working reliability of the contactor.

Claims

1. An energizing integrated contactor, characterized by, The device comprises a shell, a drive system and a contact system in the shell, and the contact system is in a sealed chamber; The contact system comprises a static contact and a dynamic contact plate, the static contact is arranged on the top of the shell and the sealed chamber, and one end of the static contact is outside the shell and the other end is inside the sealed chamber; the dynamic contact plate is arranged in the sealed chamber; An electronic ignition assembly is arranged on the top of the shell, the electronic ignition assembly comprises an electronic ignition device and a tubular electronic ignition device shell, the electronic ignition device is fixedly arranged in one end of the electronic ignition device shell and closes the end, and the electronic ignition device shell penetrates through the shell and reaches the top of the sealed chamber; A sealing element is arranged in the electronic ignition device shell, the sealing element is retractable and has a certain supporting strength, one end of the sealing element is fixedly connected with the sealed chamber, and the other end is arranged towards the electronic ignition device; An excitation execution member is arranged in the sealing element in a displacement manner, one end of the excitation execution member is arranged in the sealed chamber and corresponds to the dynamic contact plate, and the other end is fixedly connected with the end of the sealing element towards the electronic ignition device and closes the end, the end of the excitation execution member fixedly connected with the sealing element is in sealing contact with the inner wall of the electronic ignition device shell, and the sealing element supports and limits the initial position of the excitation execution member; A first sealing element is arranged in the gap between the contact surface of the electronic ignition device shell and the shell, and the first sealing element seals the gap between the electronic ignition device shell and the shell and the gap between the electronic ignition device shell and the sealed chamber; In a normal working state, a gap is reserved between the excitation execution member and the dynamic contact plate, and the drive system drives the contact system to open and close; when there is an overload current, the electronic ignition device acts according to the received trigger signal, releases high-pressure gas as a driving force, drives the excitation execution member to displace along the inner wall of the electronic ignition device shell, and drives the dynamic contact plate to displace towards the direction away from the static contact to open and close at a large distance.

2. The energizing integrated contactor of claim 1, wherein, The electronic ignition assembly and the shell are connected by a clamping buckle mode.

3. The energizing integrated contactor of claim 2, wherein, A second sealing element is arranged between the electronic ignition device shell and the sealed chamber.

4. The energizing integrated contactor of claim 3, wherein, A groove is arranged on the end surface of the electronic ignition device shell, and the second sealing element is arranged in the groove.

5. The energizing integrated contactor of claim 1, wherein, The sealing element is a bellows.

6. The energizing integrated contactor of claim 1, wherein, The first sealing element is arranged in the gap between the contact surface of the static contact and the shell.

7. The energizing integrated contactor of claim 6, wherein, The first sealing element is arranged in the gap between the shell and the sealed chamber.

8. The energizing integrated contactor of claim 1, wherein, The excitation execution member comprises a piston, a first dynamic guide rod and a guide rod carrier, the piston is fixedly connected with the end of the sealing element towards the electronic ignition device, the guide rod carrier is arranged in the sealed chamber and corresponds to the dynamic contact plate, and the first dynamic guide rod is arranged in the sealing element and is fixedly connected with the piston and the guide rod carrier at both ends.

9. The energizing integrated contactor of claim 8, wherein, The first dynamic guide rod and the guide rod carrier are integrally formed.

10. The energizing integrated contactor of claim 1, wherein, A partition is arranged in the shell to isolate the contact system from the driving system, and a sealing assembly is arranged on the partition, and the sealing assembly and the partition form the sealed chamber.

11. The energizing integrated contactor of claim 10, wherein, A magnetic steel frame is arranged between the sealing assembly side wall and the shell, and a permanent magnet is arranged on the magnetic steel frame.

12. The energizing integrated contactor according to any one of claims 1 to 11, characterized in that, The first sealing member is formed by filling epoxy resin at the gap.

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