A direct current contactor with an exciting function

Abstract

A direct current contactor with excitation function, comprising a housing, a driving system, a contact system and an excitation system; the contact system comprises a static contact and a movable contact plate assembly in a sealed chamber, and the static contact is located outside the housing; the excitation system comprises an electronic ignition assembly and a retractable excitation execution assembly; in an abnormal situation, the electronic ignition assembly acts according to the received trigger signal, and the released driving force acts on the excitation execution assembly to drive the excitation execution assembly to stretch or compress, drive the movable contact plate assembly to displace to open a large distance and trip, and the excitation execution assembly permanently deforms to resist the movable contact plate assembly; the gap between the housing and the sealed chamber and the gap between the static contact and the housing are respectively filled with sealing materials. Through the permanent deformation of the excitation execution assembly and the filling of the sealing materials, the movable contact plate assembly is maintained at a large open distance tripping position.

Description

Technical Field

[0001] This invention relates to the field of circuit switching devices, specifically to DC contactors with excitation 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 a DC contactor with an excitation function, 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 a DC contactor with an excitation function. By using an excitation actuator that undergoes permanent deformation and improving the sealing performance of the contactor, the excitation actuator after the large opening distance is opened is made to abut against the moving contact assembly, keeping it in the large opening distance open position, providing a continuous force to the moving contact assembly, preventing the moving contact assembly from re-contacting the stationary contact, and improving the working reliability of the contactor.

[0005] To achieve the above objectives, the present invention provides a DC contactor with an excitation function, comprising a housing, a drive system and a contact system for normal opening and closing of the DC contactor, and an excitation system with an excitation function for forcibly opening the contact system under abnormal conditions.

[0006] The contact system includes a stationary contact and a moving contact assembly. One end of the stationary contact and the moving contact assembly are located in a sealed chamber within the housing, while the other end of the stationary contact is located outside the housing and serves as the terminal of the DC contactor. The drive system is located within the housing. Under normal operating conditions, the drive system drives the moving contact assembly to move, and the contact system performs opening and closing operations under normal operating conditions.

[0007] The excitation system includes an electronic ignition component and a retractable excitation execution component. The electronic ignition component is disposed on the housing and located outside the sealed chamber. In abnormal circumstances, the electronic ignition component acts according to the received trigger signal, and the driving force released acts on the excitation execution component, driving the excitation execution component to stretch or compress.

[0008] The cavity at one end of the excitation execution component is connected to the cavity at the end of the electronic ignition component that releases the driving force, and the other end passes through the sealed chamber and is positioned corresponding to the moving contact plate component, with a gap maintained between them. The excitation execution component seals the contact point with the sealed chamber, keeping the sealed chamber sealed. When the contact system is operating normally, the excitation system does not operate.

[0009] The gap between the outer shell and the sealed chamber, and the gap between the stationary contact and the outer shell, are respectively filled with sealing material;

[0010] During the stretching or compression process, the excitation execution component drives the moving contact plate assembly to move, forming a large opening distance with the stationary contact to open the circuit. The excitation execution component undergoes permanent deformation and comes into contact with the moving contact plate assembly after the large opening distance is opened.

[0011] Preferably, the excitation execution component includes an elastic support and a push rod assembly; the elastic support has telescopic properties and a supporting function, and is a tubular structure with both ends through it. One end of the elastic support is sealed and fixedly connected to the sealed chamber, and the other end is a free end sealed and connected to one end of the push rod assembly. The push rod assembly seals the end of the elastic support connected to it, and the other end of the push rod assembly is located in the sealed chamber and is disposed corresponding to the moving contact plate assembly. When the electronic ignition component releases the driving force, the driving force acts on the push rod assembly, driving the push rod assembly to displace. The push rod assembly drives the moving contact plate assembly to displace and perform a large-distance opening with the stationary contact. At the same time, the displacement of the push rod assembly causes the elastic support to stretch or compress until permanent deformation occurs.

[0012] Preferably, a through hole is provided in the sealed chamber, and the elastic support is located in the sealed chamber. One end of the support is sealed and fixed to the sealed chamber located on the outer periphery of the through hole, and the other end is a free end. When the free end is oriented toward the moving contact plate assembly, the cavity at one end of the electronic ignition assembly that releases the driving force is connected to the hollow part of the elastic support through the through hole. When the free end of the elastic support is oriented toward the electronic ignition assembly, the cavity at one end of the push rod assembly that faces the stationary contact is connected to the cavity at one end of the electronic ignition assembly that releases the driving force.

[0013] Preferably, a bushing structure is provided in the sealed chamber. The bushing structure is a tubular structure with both ends open. One end of the bushing structure is sealed to the wall of the sealed chamber located on the outer periphery of the through hole, and the other end is suspended. The elastic support member passes through the bushing structure. One end of the support member facing the moving contact plate assembly is sealed and fixed to the suspended end of the bushing structure, and the other end facing the electronic ignition assembly is a free end. The push rod assembly passes through the elastic support member. One end of the push rod assembly is sealed to the free end of the elastic support member, and the other end of the push rod assembly is provided corresponding to the moving contact plate assembly.

[0014] Preferably, when the free end of the elastic support is oriented toward the electronic ignition assembly, one end of the push rod assembly that is sealed to the free end passes through the through hole and is located outside the sealed chamber. A buffer groove is provided on the end face of one end of the push rod assembly that is sealed to the free end, and the end of the electronic ignition assembly that releases the driving force is provided corresponding to the buffer groove.

[0015] Preferably, the bushing structure is integrally formed with the cavity wall of the sealed chamber; or, the end of the elastic support member facing the moving contact plate assembly is turned outward and extends towards the electronic ignition assembly to form the bushing structure.

[0016] Preferably, the electronic ignition assembly includes an ignition tube housing and an electronic ignition tube. The ignition tube housing passes through the housing, with one end located inside the housing and abutting against the sealed chamber, and the other end protruding outside the housing and housing the electronic ignition tube. The elastic support is located outside the sealed chamber and passes through the ignition tube housing. One end of the elastic support facing the moving contact plate assembly is sealed and fixed to the sealed chamber, while the other end facing the electronic ignition tube is a free end, sealed and connected to one end of the push rod assembly. The other end of the push rod assembly passes through the elastic support and the cavity wall of the sealed chamber and is located in the sealed chamber. One end of the electronic ignition tube that releases the driving force corresponds to one end of the push rod assembly sealed and connected to the elastic support. One end of the push rod assembly sealed and connected to the elastic support is in sealed contact with the inner wall of the ignition tube housing.

[0017] Preferably, the ignition tube housing has one end of the electronic ignition tube protruding outside the housing, and the ignition tube housing is connected to the housing by a snap-fit ​​mechanism.

[0018] Preferably, the signal receiving end of the electronic ignition component is electrically connected to one end of the conductive sheet, and the other end of the conductive sheet is located at the end of the drive system away from the electronic ignition component, serving as the connection end of the signal receiving end.

[0019] Preferably, the electronic ignition assembly is an electronic ignition tube, wherein the electronic ignition tube is directly disposed in the housing; or the electronic ignition assembly includes an ignition tube housing and an electronic ignition tube, wherein the electronic ignition tube is disposed in one end of the ignition tube housing, wherein the ignition tube housing is directly disposed in the housing.

[0020] A cavity is provided between the signal receiving end of the electronic ignition tube and the outer shell, or a cavity is provided between the signal receiving end of the electronic ignition tube and the inner wall of the ignition tube outer shell.

[0021] The cavity between the signal receiving end of the electronic ignition tube and the outer shell, and the cavity between the signal receiving end of the electronic ignition tube and the inner wall of the ignition tube outer shell, are sealed by filling with sealing material or by the conductive sheet to form a sealed overflow cavity.

[0022] The gap between the electronic ignition tube and the housing, and the gap between the electronic ignition tube and the ignition tube housing, are connected to the overflow cavity; when the electronic ignition tube releases high-pressure gas as a driving force, the high-pressure gas overflows into the overflow cavity.

[0023] Preferably, the push rod assembly includes a sleeve structure, a push rod, and a piston. The push rod passes through the elastic support member. The piston and the sleeve structure are located at both ends of the elastic support member and are fixedly connected to both ends of the push rod. The piston is located in the sealed chamber and is positioned corresponding to the moving contact plate assembly. The sleeve structure is sealed to the free end of the elastic support member and closes the free end of the elastic support member. A buffer groove is provided at one end of the sleeve structure facing the electronic ignition assembly, and the end of the electronic ignition assembly that releases the driving force is positioned corresponding to the buffer groove. At least one limiting structure is provided on the outer periphery of the sleeve structure.

[0024] Preferably, a diversion hole is provided on one end face of the sleeve structure facing the electronic ignition assembly, and part of the driving force is applied to the sleeve structure through the diversion hole.

[0025] Preferably, the sleeve structure and the push rod are an integral structure.

[0026] Preferably, one end of the push rod assembly facing the moving contact plate assembly is configured as a piston structure, and at least one guide hole is provided on the piston structure, which extends through both ends of the piston displacement direction.

[0027] Preferably, the housing consists of at least two parts: one part is the housing portion of the chamber where the contact system is located, and the other part is the housing portion of the chamber where the drive system is located; the electronic ignition assembly is integrally formed with the housing portion of the chamber where the contact system is located.

[0028] The DC contactor with excitation function of the present invention keeps the moving contact assembly in the large-distance open position by exciting the permanent deformation of the actuator, thereby improving the reliability of the opening.

[0029] By filling the gaps between the contactor housing and the electronic ignition assembly, the stationary contact and the housing, and the housing and the sealed chamber with sealing material, the sealing performance of the entire housing structure is improved. This prevents the leakage of high-pressure propellant gas released by the electronic ignition assembly, maintaining a high-pressure state inside the housing. This further positions the moving contact assembly at the large-distance open position and enhances the insulation between the contacts. Filling the sealed chamber between the contactor and the housing with sealing material not only improves the sealing effect of the sealed chamber against inert gases but also increases the overall mechanical strength. A sleeve structure on the push rod assembly buffers the high-pressure gas, reducing the impact force on the housing and improving its impact resistance. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of a sealing elastic element installed inside a sealing cavity.

[0031] Figure 2 yes Figure 1 A schematic diagram of the external structure.

[0032] Figure 3 This is a schematic diagram of a structure in which the sealing elastic element is located outside the sealing cavity.

[0033] Figure 4 yes Figure 3 A schematic diagram of the external structure.

[0034] Figure 5 This is a schematic diagram of a structure in which a sealing elastic element is installed in a sealing cavity and is equipped with a bushing structure.

[0035] Figure 6 This is a schematic diagram of the sleeve structure and the push rod integrally formed structure.

[0036] Figure 7 This is a structural diagram of a sleeve structure as an independent part.

[0037] Figure 8 This is a schematic diagram of a piston structure.

[0038] Figure 9 This is a schematic diagram of a structure with conductive sheets.

[0039] Figure 10 This is a schematic diagram of the external structure with conductive sheets.

[0040] Figure 11 This is a schematic diagram of a structure with an overflow cavity.

[0041] Figure 12 yes Figure 11 Enlarged view of part A in the middle.

[0042] Figure label:

[0043] 1. Electronic ignition assembly; 2. Ignition tube housing; 3. Elastic support; 4. Push rod; 5. Sealed housing structure; 6. Piston; 7. Stationary contact; 8. Moving contact plate; 9. Moving iron core; 10. Drive coil assembly; 11. Housing; 12. Sealed chamber; 13. Bushing structure; 14. Sleeve structure; 15. Push rod; 16. Sealing material; 17. Buffer groove; 18. Limiting structure; 19. Hole structure; 20. Conductive sheet; 21. Overflow cavity. Detailed Implementation

[0044] The present invention provides a DC contactor with an excitation function, comprising a housing, a drive system and a contact system for normal opening and closing of the DC contactor, and an excitation system having an excitation function for forcibly opening the contact system under abnormal conditions.

[0045] The contact system includes a stationary contact and a moving contact assembly. One end of the stationary contact and the moving contact assembly are located in a sealed chamber inside the housing, while the other end of the stationary contact is located outside the housing as the terminal of the DC contactor. The drive system is located inside the housing. Under normal operating conditions, the drive system drives the moving contact assembly to move, and the contact system performs opening and closing operations under normal operating conditions.

[0046] The excitation system includes an electronic ignition component and a retractable excitation execution component. The electronic ignition component is mounted on the housing and located outside the sealed chamber. In abnormal circumstances, the electronic ignition component acts according to the received trigger signal, and the driving force released acts on the excitation execution component, driving the excitation execution component to stretch or compress.

[0047] One end of the excitation execution component is connected to the cavity at the end of the electronic ignition component that releases the driving force, and the other end passes through the sealed chamber and is set to the moving contact plate component, with a gap maintained between the excitation execution component and the sealing chamber. The contact point between the excitation execution component and the sealing chamber is sealed to keep the sealing chamber sealed. When the contact system is opening and closing under normal operating conditions, the excitation system does not operate.

[0048] The gaps between the outer shell and the sealed chamber, and between the stationary contact and the outer shell, are filled with sealing material.

[0049] During the stretching or compression process, the excitation actuator drives the moving contact assembly to move, forming a large opening distance with the stationary contact to open the circuit. The excitation actuator undergoes permanent deformation and comes into contact with the moving contact assembly after the large opening distance is opened.

[0050] 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 solutions of this invention.

[0051] The DC contactor with excitation function of the present invention is shown below. Figures 1 to 2 The circuit includes a housing 11, in which a partition divides the housing 11 into two chambers. The contact system and the drive system are located in different chambers within the housing 11. Under normal operating conditions, the drive system drives the contact system to perform normal opening and closing operations.

[0052] A sealed housing structure 5 is provided in the chamber containing the contact system. The sealed housing structure 5 is sealed to the partition, forming a sealed chamber 12 between the sealed housing structure 5 and the partition. The sealed chamber 12 can be a vacuum or filled with an inert gas as an arc-extinguishing medium. The top of the sealed housing structure 5 is pressed against the top of the outer shell 11. The sealed housing structure 5 is a dome-shaped structure made of ceramic. The sealed housing structure 5 can be welded to the partition, or other sealing methods can be used.

[0053] The drive system mainly includes a drive coil assembly 10, a moving iron core 9, a moving guide rod, a stationary iron core, and a reaction spring. One end of the moving guide rod is fixedly connected to the moving iron core 9, and the other end passes through a partition and is located in the sealed chamber 12 formed by the sealed housing structure 5 and the partition. The moving contact plate assembly is fixedly mounted on the moving guide rod. When the drive coil is energized, it drives the moving iron core, which in turn moves the moving guide rod and the moving contact plate assembly, causing the contact system to close. When the drive coil is de-energized, the moving contact plate assembly opens the circuit with the stationary contact. This drive system is existing technology for DC contactors. For any issues not covered herein, please refer to the drive systems in existing DC contactors.

[0054] The contact system includes a moving contact assembly and two stationary contacts 7. The moving contact assembly includes a moving contact support assembly and a moving contact 8. The moving contact 8 is movably mounted on the moving contact support assembly, which is fixedly mounted on a moving guide rod. The two stationary contacts 7 are mounted on the top of the housing 11 with an insulating gap. One end of each stationary contact 7 is located outside the housing 11, and the other end passes through the top of the housing 11 and the top of the sealing assembly 12 and is located in the sealed chamber.

[0055] Mounting holes are respectively provided at corresponding positions on the top of the outer casing 11 and the sealing housing structure 5 between the two stationary contacts 7. The electronic ignition assembly 1 is fixedly installed in the mounting hole on the top of the outer casing 11. The signal receiving end of the electronic ignition assembly is located outside the outer casing 11, and the end of the electronic ignition assembly that releases high-pressure gas faces the inside of the outer casing 11. The electronic ignition assembly includes an electronic ignition tube 1 and an ignition tube outer casing 2. The electronic ignition assembly may not have an ignition tube outer casing 2. When the electronic ignition assembly does not have an ignition tube outer casing 2, the electronic ignition tube is directly installed in the mounting hole of the outer casing 11. A ring-shaped sealing contact structure is provided on the inner wall of the outer casing 11 around the mounting hole inside the outer casing 11. The sealing contact structure abuts against the top of the sealing housing structure 5, so that the gap between the mounting hole on the outer casing and the outer casing and sealing housing structure 5 on the outer periphery of the mounting hole is not connected. In order to improve the sealing performance, a sealing ring is provided between the sealing contact structure and the sealing housing structure 5 for sealing. When the electronic ignition assembly is equipped with an ignition tube housing 2, the ignition tube housing 2 passes through a mounting hole on the housing, and one end of the ignition tube housing 2 abuts against the top of the sealing housing structure 5, so that the cavity where the high-pressure gas release end of the electronic ignition tube is located in the ignition tube housing is not connected to the gap between the housing and the sealing housing structure 5 on the outer periphery of the mounting hole. To improve the sealing performance, a sealing ring is provided between the ignition tube housing and the sealing housing structure 5.

[0056] An elastic support 3 is provided in the sealed chamber 12 formed by the sealed housing structure 5 and the partition. The elastic support 3 has a certain elasticity and a certain supporting strength. The elastic support 3 is a tubular structure with two through ends, such as a corrugated metal pipe. One end of the elastic support 3 is fixedly connected to the outer periphery of the mounting hole at the top of the sealed housing structure 5 by a sealed connection, and the other end is a free end, which is sealed to a push rod assembly. The push rod assembly seals the end of the elastic support 3 that is sealed to it. The push rod assembly is set to correspond to the moving contact plate assembly. When the moving contact plate assembly is closed, a gap is maintained between the push rod assembly and the moving contact plate assembly. Therefore, the push rod assembly does not affect the closing action of the moving contact plate assembly during normal operation. The sealed connection between the elastic support 3 and the sealed housing structure 5, and the sealed connection between the push rod assembly and the end of the elastic support 3, can be achieved by welding or by adhesive bonding.

[0057] The push rod assembly includes a push rod 4 and a piston 6. The end of the push rod 4 is welded and sealed to the end of the elastic support 3, thus sealing the end of the elastic support 3. The push rod 4 and the piston 6 are fixedly connected, or the push rod 4 and the piston 6 are an integral structure. The piston 6 is positioned corresponding to the moving contact plate of the moving contact plate assembly. A groove is provided at the end of the piston 6 facing the moving contact plate, allowing this end to abut against the moving contact plate. The displacement of the piston 6 drives the moving contact plate and the moving contact plate support assembly to move away from the stationary contact 7. To improve seismic resistance, at least one limiting structure is provided on the outer periphery of the push rod 4 or the piston 6. The limiting structure is a limiting protrusion protruding from the outer periphery of the push rod 4 or the piston 6, and is engaged at a limiting notch on the inner wall of the sealed housing structure. Alternatively, a supporting limiting structure can be provided on the partition, with the limiting structure mounted on the supporting limiting structure. When the push rod and piston move, the limiting structure is first disengaged to release the limiting, and then the push rod and piston 6 begin to move.

[0058] The sealing performance of the sealing chamber 12 formed between the sealing housing structure 5, the top mounting hole of the sealing housing structure 5 is sealed by the sealing connection between the elastic support 3 and the sealing housing structure 5, and the sealing connection between the push rod assembly and the end of the elastic support 3.

[0059] Sealing material 16, made of epoxy resin, is filled in the gaps between the contact surfaces of the stationary contact 7 and the housing 11, the gaps between the sealing housing structure 5 and the housing 11, and the gaps between the contact surfaces of the electronic ignition assembly 1 and the housing 11. Filling with sealing material improves the sealing performance of the entire housing structure. Simultaneously, filling the gaps between the sealing housing structure 5 and the housing 11 with sealing material also enhances the mechanical strength of the housing.

[0060] The high-pressure gas (driving force) release end of the electronic ignition assembly 1 corresponds to the mounting hole at the top of the sealed housing structure 5. Due to the filling of the sealing material and the sealing of the elastic support 3, the cavity where the high-pressure gas release end of the electronic ignition assembly 1 is located is connected to the hollow part of the elastic support 3. The high-pressure gas released by the electronic ignition assembly 1 acts on the push rod 4 through the hollow part of the elastic support 3, driving the push rod 4 and the piston 6 to move together toward the moving contact plate assembly.

[0061] Working principle:

[0062] Under normal operating conditions, when the drive coil of the drive system is energized, it drives the moving contact plate assembly to move and close the contact system. When the drive coil is de-energized, the moving contact plate assembly moves away from the stationary contact and opens the contact system.

[0063] In case of abnormal conditions (such as overload current or short circuit current), the electronic ignition assembly 1 acts according to the received trigger signal, releasing high-pressure gas as driving force to drive the push rod 4 and piston 6 to move towards the moving contact plate assembly. The piston 6 contacts the moving contact plate 8 and moves away from the stationary contact 7. When the moving contact plate 8 moves to the normal opening position, the moving contact plate support assembly stops moving, and the piston 6 continues to contact the moving contact plate 8 to compress the contact spring, realizing the large opening distance between the moving contact plate 8 and the stationary contact 7. During the process of the moving contact plate assembly moving to the large opening distance opening position, the elastic support 3 is stretched from elastic to permanent deformation and loses its elasticity.

[0064] Due to the permanent deformation of the elastic support 3, it will not rebound, thus improving the stability of the large-distance opening of the moving contact assembly. At the same time, the filling of the sealing material improves the sealing performance of the overall shell structure, ensuring that the high-pressure gas acting on the push rod 4 remains under high pressure. The combination of the permanent deformation of the elastic support 3 and the high-pressure gas acting on the push rod 4 ensures the stability of the large-distance opening of the moving contact assembly and the insulation performance after opening.

[0065] Since the moving contact plate is driven by a piston to forcibly disconnect the circuit, the displacement speed of the moving contact plate is much greater than that during normal disconnection. As the moving contact plate moves rapidly, the electric arc generated during disconnection is quickly stretched, causing the arc to cool down and extinguish, thus completing the disconnection process.

[0066] Figure 1 The elastic support 3 is disposed within the sealed chamber 12, but can also be disposed outside the sealed chamber 12. (See attached image) Figure 3 and Figure 4The electronic ignition assembly 1 includes an electronic ignition tube 1 and an ignition tube housing 2. The ignition tube housing 2 passes through the top of the housing 11, with one end abutting against the top of the sealing housing structure 5 and the other end protruding outside the housing 11 to lengthen the ignition tube housing 2. The electronic ignition tube 1 is located at the end of the ignition tube housing 2 located outside the housing and seals the end of the ignition tube housing 2.

[0067] The elastic support 3 is inserted into the ignition tube housing 2. One end of the support is sealed and fixed to the top of the sealing housing structure 5, for example, by welding. The other end is set towards the electronic ignition tube 1.

[0068] The push rod assembly includes a push rod 4 and a piston 6. The longitudinal section of the push rod 4 is T-shaped, with its transversely oriented end face located between the elastic support 3 and the electronic ignition tube 1. The push rod 4 is sealed to the end of the elastic support 3 facing the electronic ignition tube 1, forming a closed end. The vertically oriented rod portion of the push rod 4 passes through the hollow portion of the elastic support 3 and the mounting hole at the top of the sealing housing structure 5, and is connected and fixed to the piston 6 located in the sealing chamber 12. The end of the push rod 4 that is sealed to the elastic support 3 is in close contact or sealed to the inner wall of the ignition tube housing 2. This sealing contact can be achieved by providing a sealing ring on the outer circumference of the end of the push rod 4. Sealing material is filled in the gaps between the housing 11 and the sealing housing structure 5, the gap between the stationary contact 7 and the housing 11, and the gap between the ignition tube housing 2 and the housing 11. The sealing connection between the elastic support, the sealed housing structure, the partition, and the end face of the push rod facing the electronic ignition tube forms a sealed chamber 12. The sealing performance is further improved by the sealing material filled on the outer periphery, preventing inert gas, high-pressure gas released by the electronic ignition tube, etc. from leaking out of the outer shell.

[0069] Working principle:

[0070] Under normal operating conditions, when the drive coil of the drive system is energized, it drives the moving contact plate assembly to move and close the contact system. When the drive coil is de-energized, the moving contact plate assembly moves away from the stationary contact and opens the contact system.

[0071] In case of abnormal conditions (such as overload current or short-circuit current), the electronic ignition tube 1 activates according to the received trigger signal, releasing high-pressure gas as a driving force to drive the push rod 4 to move along the ignition tube housing 2, causing the piston 6 to move towards the moving contact plate assembly. The piston 6 contacts the moving contact plate 8 and moves away from the stationary contact 7. When the moving contact plate 8 reaches the normal open position, the moving contact plate support assembly stops moving, and the piston 6 continues to contact the moving contact plate 8, compressing the contact spring and achieving a large-distance opening between the moving contact plate 8 and the stationary contact 7. During the process of the moving contact plate assembly moving to the large-distance opening position, the elastic support 3 is compressed from elasticity until it is permanently deformed and loses its elasticity. Under the combined action of the high-pressure gas released by the electronic ignition tube 1 and the permanent deformation of the elastic support 3, the piston 6 is ensured to always contact the moving contact plate, keeping it in the large-distance position.

[0072] Figure 1 The elastic support member is installed in the sealed chamber 12. Because one end is sealed and fixed to the sealed housing structure 5, while the other end is suspended, its seismic resistance is reduced. When no limiting structure is provided on the push rod and piston, the elastic support member may expand and contract under vibration and impact, potentially causing malfunction and forcibly opening the moving contact plate, resulting in unstable closing state of the contact system under normal operating conditions. To solve the above defects, a bushing structure 13 is provided in the sealed chamber 12 to support and limit the initial position of the elastic support member 3. Figure 1 The tension of the medium elastic support 3 becomes Figure 5 The compression of the elastic support member 3 in the middle. See the detailed structure for reference. Figure 5 Mounting holes are provided at corresponding positions on the top of the outer casing 11 and the sealing housing structure 5, such as between the two stationary contacts 7. The electronic ignition tube 1 is directly fixedly installed in the mounting hole of the outer casing 11. A bushing structure 13 is fixedly connected to the outer periphery of the mounting hole inside the sealing housing structure 5. The bushing structure 13 is a cylindrical structure with both ends through, which has a certain supporting strength and is not easily deformed. One end of the bushing structure 13 is sealed and fixed to the sealing housing structure 5 by welding or integral molding, and the other end is suspended in the sealing chamber 12. The end face of the suspended bushing structure 13 is partially closed, and a ring-shaped limiting end face is formed on the inner wall of the bushing structure 13 at the end face to partially close the suspended end. The elastic support 3 is disposed in the hollow part of the bushing structure 13. One end of the elastic support 3 is fixed to the limiting end face of the bushing structure 13 that is suspended by welding. The other end of the elastic support 3 is disposed towards the top of the sealing shell structure 5. The bushing structure 14 forms a support for the elastic support 3 and the push rod assembly.

[0073] The bushing structure 13 can be an independent structure, with its two ends welded to the sealing shell structure and the elastic support respectively. Alternatively, the bushing structure 13 can be integrally formed on the sealing shell structure. In addition, the bushing structure 13 can be integrally formed on the outer periphery of the elastic support 3, for example, when the elastic support 3 is a metal bellows, the end of the metal bellows facing the piston is flipped outward and then stretched towards the other end. The open end of the bushing structure 13 is sealed and fixed to the sealing shell structure, which saves the assembly process of sealing the bushing structure 13 with the elastic support.

[0074] The push rod assembly includes a sleeve structure 14, a push rod 15, and a piston 6. The sleeve structure 14 and piston 6 are located outside the two ends of the elastic support member 3, respectively. Piston 6 is located between the bushing structure 13 and the moving contact plate assembly, and sleeve structure 14 is located between the elastic support member 3 and the electronic ignition tube 1. Push rod 15 passes through the hollow portion of the elastic support member 3, and its two ends are connected and fixed to the sleeve structure 14 and piston 6, respectively, to form the push rod assembly. (See reference...) Figure 6 The sleeve structure 14 is a concave structure with one end open and the other end closed. The recessed part of the concave structure is a buffer recess 17 with a buffering function. The sleeve structure 14 and the push rod 15 are integrally formed; or, see Figure 7 The sleeve structure 14 is an independent part, a concave structure with buffer grooves at both ends. The open end of the sleeve structure 14 facing the elastic support is connected to the push rod 15, and the push rod 15 closes the open end of the sleeve structure 14 facing the elastic support 3, forming a closed end. The closed end of the sleeve structure 14 is welded and sealed to the end of the elastic support 3, thus closing the opening of the elastic support 3 facing the electronic ignition tube. The open end of the sleeve structure 14 passes through the mounting hole at the top of the sealing housing structure 5 and abuts against the top inner wall of the outer shell 11. The end of the electronic ignition tube 1 that releases high-pressure gas is located in the buffer groove of the sleeve structure 14, so that the high-pressure gas released by the electronic ignition tube 1 is buffered by the buffer groove, reducing the pressure of the high-pressure gas before acting on the sleeve structure 14.

[0075] At least one limiting structure 18 is provided on the outer peripheral surface of the sleeve structure 14. The limiting structure 18 is a limiting protrusion that is relatively easy to break. A limiting notch is provided on the top outer surface of the sealing housing structure 15. The limiting structure 18 on the sleeve structure 14 is engaged with the limiting notch on the top outer surface of the sealing housing structure 15, thereby limiting the initial position of the sleeve structure 14, i.e., the push rod assembly and the elastic support 3, and improving the vibration and impact resistance.

[0076] The push rod assembly, including the sleeve structure 14, push rod 15, and piston 6, can also be applied to... Figure 3 In the structure.

[0077] Working principle:

[0078] Under normal operating conditions, when the drive coil of the drive system is energized, it drives the moving contact plate assembly to move and close the contact system. When the drive coil is de-energized, the moving contact plate assembly moves away from the stationary contact and opens the contact system.

[0079] In case of abnormal conditions (such as overload current or short circuit current), the electronic ignition tube 1 acts according to the received trigger signal, releasing high-pressure gas as a driving force. After the pressure of the high-pressure gas is reduced by the buffer groove, it acts on the sleeve structure 14, first causing the sleeve structure 14 to disconnect from the connection with the limiting structure 18, releasing the limit. Then, the sleeve structure 14 is driven to move towards the moving contact plate assembly along with the piston 6. The piston 6 touches the moving contact plate 8 and moves away from the stationary contact 7. When the moving contact plate 8 moves to the normal opening position, the moving contact plate support assembly stops moving. The sleeve structure 14 and the piston 6 continue to touch the moving contact plate 8 and move, compressing the contact spring, realizing the large opening distance between the moving contact plate 8 and the stationary contact 7. During the process of the moving contact plate assembly moving to the large opening distance opening position, the elastic support 3 is elastically compressed in the bushing structure 14 until it is permanently deformed and loses its elasticity. Under the combined action of the high-pressure gas released by the electronic ignition tube 1 and the permanent deformation of the elastic support 3, the piston 6 is kept in contact with the moving contact plate and kept in the large opening position.

[0080] In the above embodiments, the buffer groove of the sleeve structure 14 is used to reduce the pressure of the high-pressure gas. The greater the reduction in high-pressure gas pressure, the lower the displacement rate of the push rod assembly, and the relatively lower the opening speed of the large-distance circuit breaker. The smaller the volume of the buffer groove of the sleeve structure 14, the smaller the reduction in high-pressure gas pressure, the greater the force acting on the push rod assembly, the greater the displacement rate of the push rod assembly, and the shorter the breaking response time. Therefore, the operating speed of the push rod assembly can be controlled by the size of the buffer groove structure of the sleeve structure 14.

[0081] In the above embodiments, see Figure 8 The piston 6 has a groove at one end facing the moving contact plate assembly, and a connection hole for connecting to the push rod is located at the center of the piston 6. A flow-guiding perforation structure 19 is provided on the end face or outer periphery of the piston 6, extending through both ends of the piston 6 in the displacement direction. At least one perforation structure 19 is provided. When the piston 6 moves, the airflow that obstructs the piston 6's movement passes through the flow-guiding perforation structure 19, reducing resistance to piston 6 displacement, increasing the piston 6's displacement rate, and thus increasing the breaking speed.

[0082] Based on the above embodiments, a conductive sheet 20 for connection can also be provided outside the sealed chamber and the chamber where the drive system is located, see [reference]. Figure 9 and Figure 10One end of the conductive sheet 20 is electrically connected to the signal receiving end of the electronic ignition assembly located outside the housing. The other end of the conductive sheet 20 is located outside the cavity where the drive system is located, serving as the connection end between the signal receiving end and the external environment. This ensures insulation and isolation between the high-voltage and low-voltage ends, with sufficient insulation distance to improve insulation capability. The conductive sheet 20 and the signal receiving end are integrally connected by welding.

[0083] When the electronic ignition tube 1 is directly installed in the mounting hole of the housing and is not integrally formed, the signal receiving end of the electronic ignition tube 1 is located in the mounting hole, which is equivalent to the signal receiving end passing through the mounting hole. Therefore, there is a cavity between the signal receiving end and the housing 11. When the electronic ignition tube 1 is installed in the ignition tube housing 2 and is not integrally formed, the signal receiving end is located in the ignition tube housing, and there is also a cavity between the signal receiving end and the ignition tube housing 2. There is an assembly gap between the electronic ignition tube 1 and the mounting hole, and there is an assembly gap between the electronic ignition tube 1 and the ignition tube housing 2. The high-pressure gas released by the electronic ignition tube 1 may leak to the outside of the housing through the assembly gap, thereby reducing the pressure of the high-pressure gas inside the housing. To solve this defect, see Figure 11 and Figure 12 In the cavities between the signal receiver and the ignition tube housing 2, and between the signal receiver and the housing 11, a sealing material 16 (such as epoxy resin) is filled from the outside of the housing to seal one end of the cavity facing the outside of the housing, forming an overflow cavity 21 isolated from the outside of the housing. This cavity can also be sealed by a conductive sheet electrically connected to the signal receiver. When sealed by a conductive sheet, the conductive sheet and the signal receiver are integrally connected by welding. A small portion of the high-pressure gas released by the explosion of the electronic ignition tube 1 will enter the overflow cavity 21 through the assembly gap, achieving the purpose of collecting the overflow gas, and also reducing the pressure of the high-pressure gas and buffering the impact of the high-pressure gas on the housing.

[0084] Because the cavity between the electronic ignition tube and the push rod assembly is relatively small, the pressure of the high-pressure gas released by the electronic ignition tube is very high, which can cause a great impact on the housing. In order to reduce the damage to the housing caused by the impact, a cavity can also be opened on the inner wall of the housing between the electronic ignition tube and the push rod assembly. This increases the volume of the cavity between the electronic ignition tube and the push rod assembly, thereby reducing the pressure of the high-pressure gas released by the electronic ignition assembly, providing a certain buffer against the impact, and improving the impact resistance of the housing.

[0085] In the above embodiments, a sealing ring is provided at the contact surface between the electronic ignition assembly and the sealing housing structure 5, or at the contact surface between the top of the outer shell of the electronic ignition tube and the sealing housing structure 5, to prevent the sealing material from entering the cavity where the high-pressure gas is released from the electronic ignition tube during filling. Of course, a sealing ring may not be provided, as long as there is tight contact.

[0086] In the above embodiments, the electronic ignition component can be independent and fixedly connected to the housing, or it can be integrally injection molded with the housing to form a single structure. For ease of assembly, the housing consists of at least two parts: one part is the housing portion located in the chamber containing the contact system, and the other part is the housing portion located in the chamber containing the drive system. The housing portion located in the chamber containing the contact system is integrally injection molded with the electronic ignition component; in this case, it is not necessary to fill the space between the electronic ignition component and the housing with sealing material.

Claims

1. A DC contactor with excitation function, characterized in that, It includes a housing, a drive system and a contact system for the normal opening and closing of a DC contactor, and an excitation system with an excitation function for forcibly opening the contact system under abnormal conditions; The contact system includes a stationary contact and a moving contact assembly. One end of the stationary contact and the moving contact assembly are located in a sealed chamber in the housing, and the other end of the stationary contact is located outside the housing as the terminal of the DC contactor. The drive system is located in the housing. Under normal operating conditions, the drive system drives the moving contact plate assembly to move, and the contact system performs opening and closing operations under normal operating conditions. The excitation system includes an electronic ignition component and a retractable excitation execution component. The electronic ignition component is disposed on the housing and located outside the sealed chamber. In abnormal circumstances, the electronic ignition component acts according to the received trigger signal, and the driving force released acts on the excitation execution component, driving the excitation execution component to stretch or compress. The cavity at one end of the excitation execution component is connected to the cavity at the end of the electronic ignition component that releases the driving force, and the other end passes through the sealed chamber and is positioned corresponding to the moving contact plate component, with a gap maintained between them. The excitation execution component seals the contact point with the sealed chamber, keeping the sealed chamber sealed. When the contact system is operating normally, the excitation system does not operate. The gap between the outer shell and the sealed chamber, and the gap between the stationary contact and the outer shell, are respectively filled with sealing material; During the stretching or compression process, the excitation execution component drives the moving contact plate assembly to move, forming a large opening distance with the stationary contact to open the circuit. The excitation execution component undergoes permanent deformation and comes into contact with the moving contact plate assembly after the large opening distance is opened.

2. The DC contactor with excitation function according to claim 1, characterized in that, The excitation execution component includes an elastic support and a push rod assembly. The elastic support has telescopic properties and a supporting function. The elastic support is a tubular structure with both ends extending through it. One end of the elastic support is sealed and fixedly connected to the sealed chamber, and the other end is a free end that is sealed and connected to one end of the push rod assembly. The push rod assembly seals the end of the elastic support connected to it. The other end of the push rod assembly is located in the sealed chamber and is positioned corresponding to the moving contact plate assembly. When the electronic ignition component releases the driving force, the driving force acts on the push rod assembly, driving the push rod assembly to displace. The push rod assembly drives the moving contact plate assembly to displace and perform a large-distance opening with the stationary contact. At the same time, the displacement of the push rod assembly causes the elastic support to stretch or compress until permanent deformation occurs.

3. The DC contactor with excitation function according to claim 2, characterized in that, in The sealed chamber has a through hole, and the elastic support is located in the sealed chamber. One end of the support is sealed and fixed to the sealed chamber located on the outer periphery of the through hole, and the other end is a free end. When the free end is oriented toward the moving contact plate assembly, the cavity at one end of the electronic ignition assembly that releases the driving force is connected to the hollow part of the elastic support through the through hole. When the free end of the elastic support is oriented toward the electronic ignition assembly, the cavity at one end of the push rod assembly that faces the stationary contact is connected to the cavity at one end of the electronic ignition assembly that releases the driving force.

4. The DC contactor with excitation function according to claim 3, characterized in that, A bushing structure is provided in the sealed chamber. The bushing structure is a tubular structure that extends through both ends. One end of the bushing structure is sealed to the wall of the sealed chamber located on the outer periphery of the through hole, and the other end is suspended. The elastic support member passes through the bushing structure. One end of the support member facing the moving contact plate assembly is sealed and fixed to the suspended end of the bushing structure, and the other end facing the electronic ignition assembly is a free end. The push rod assembly passes through the elastic support member. One end of the push rod assembly is sealed to the free end of the elastic support member, and the other end of the push rod assembly is positioned corresponding to the moving contact plate assembly.

5. The DC contactor with excitation function according to claim 4, characterized in that, When the free end of the elastic support is oriented toward the electronic ignition assembly, one end of the push rod assembly, which is sealed to the free end, passes through the through hole and is located outside the sealed chamber. A buffer groove is provided on the end face of the push rod assembly that is sealed to the free end, and the end of the electronic ignition assembly that releases the driving force is provided corresponding to the buffer groove.

6. The DC contactor with excitation function according to claim 4, characterized in that, The bushing structure is integrally formed with the cavity wall of the sealed chamber; or, the end of the elastic support member facing the moving contact plate assembly is turned outward and extends towards the electronic ignition assembly to form the bushing structure.

7. The DC contactor with excitation function according to claim 2, characterized in that, The electronic ignition assembly includes an ignition tube housing and an electronic ignition tube. The ignition tube housing passes through the housing, with one end located inside the housing and abutting against the sealed chamber, and the other end protruding outside the housing and housing the electronic ignition tube. The elastic support is located outside the sealed chamber and passes through the ignition tube housing. One end of the elastic support facing the moving contact plate assembly is sealed and fixed to the sealed chamber, while the other end facing the electronic ignition tube is a free end, sealed and connected to one end of the push rod assembly. The other end of the push rod assembly passes through the elastic support and the cavity wall of the sealed chamber and is located inside the sealed chamber. One end of the electronic ignition tube that releases the driving force corresponds to one end of the push rod assembly sealed and connected to the elastic support. One end of the push rod assembly sealed and connected to the elastic support is in sealed contact with the inner wall of the ignition tube housing.

8. The DC contactor with excitation function according to claim 7, characterized in that, The ignition tube housing has one end of the electronic ignition tube protruding outside the housing, and the ignition tube housing is connected to the housing by a snap-fit ​​method.

9. The DC contactor with excitation function according to claim 1, characterized in that, The signal receiving end of the electronic ignition component is electrically connected to one end of the conductive sheet, and the other end of the conductive sheet is located outside the chamber where the drive system is located, serving as the connection end of the signal receiving end.

10. The DC contactor with excitation function according to claim 9, characterized in that, The electronic ignition assembly is an electronic ignition tube, wherein the electronic ignition tube is directly disposed in the housing; or the electronic ignition assembly includes an ignition tube housing and an electronic ignition tube, wherein the electronic ignition tube is disposed in one end of the ignition tube housing, wherein the ignition tube housing is directly disposed in the housing. A cavity is provided between the signal receiving end of the electronic ignition tube and the outer shell, or a cavity is provided between the signal receiving end of the electronic ignition tube and the inner wall of the ignition tube outer shell. The cavity between the signal receiving end of the electronic ignition tube and the outer shell, and the cavity between the signal receiving end of the electronic ignition tube and the inner wall of the ignition tube outer shell, are sealed by filling with sealing material or by the conductive sheet to form a sealed overflow cavity. The gap between the electronic ignition tube and the housing, and the gap between the electronic ignition tube and the ignition tube housing, are connected to the overflow cavity; when the electronic ignition tube releases high-pressure gas as a driving force, the high-pressure gas overflows into the overflow cavity.

11. The DC contactor with excitation function according to claim 2, characterized in that, The push rod assembly includes a sleeve structure, a push rod, and a piston. The push rod passes through the elastic support member. The piston and the sleeve structure are located at both ends of the elastic support member and are fixedly connected to both ends of the push rod. The piston is located in the sealed chamber and is positioned corresponding to the moving contact plate assembly. The sleeve structure is sealed to the free end of the elastic support member and closes the free end of the elastic support member. A buffer groove is provided at the end of the sleeve structure facing the electronic ignition assembly, and the end of the electronic ignition assembly that releases the driving force is positioned corresponding to the buffer groove. At least one limiting structure is provided on the outer periphery of the sleeve structure.

12. The DC contactor with excitation function according to claim 11, characterized in that, The sleeve structure and the push rod are an integral structure.

13. The DC contactor with excitation function according to claim 2, characterized in that, The end of the push rod assembly facing the moving contact plate assembly is configured as a piston structure, and at least one flow-guiding pore structure is provided on the piston structure, which extends through both ends of the piston displacement direction.

14. The DC contactor with excitation function according to claim 1, characterized in that, The housing consists of at least two parts: one part is the housing of the chamber where the contact system is located, and the other part is the housing of the chamber where the drive system is located; the electronic ignition assembly is integrally formed with the housing of the chamber where the contact system is located.

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