Integrated motion type excitation integrated contactor

Abstract

The utility model relates to the field of circuit protection and contactors, in particular to an integrated motion type excitation integrated contactor which comprises a movable contact bridge, a static contact, a movable iron core, a static iron core, a movable guide rod, an excitation ignition assembly, a piston, an auxiliary contact assembly and at least one melt, and the melt is connected with the auxiliary contact assembly in series. The two ends of the auxiliary contact assembly and the melt which are connected in series are conductively connected with a static contact of the contactor, in the initial position, the auxiliary contact assembly is arranged in an insulated mode, and the melt and the static contact are not conducted; the excitation ignition assembly acts according to a received trigger signal and drives the piston to displace, the piston drives the static iron core, the movable iron core and the movable guide rod to displace, so that the auxiliary contact assembly is switched on, and after the melt is connected into a main loop in a parallel connection mode and a contact system of the contactor is driven to be switched off, the melt is disconnected in a mechanical mode. Under the normal function of the contactor, the power consumption of the contactor during normal work is reduced, and the breaking capacity of the contactor is improved.

Description

Technical Field

[0001] This invention relates to the fields of circuit protection and contactors, and also to a contactor that integrates a fuse, particularly an integrated motion-driven excitation contactor. Background Technology

[0002] Currently, the protection measures for DC circuit systems (especially wind power, photovoltaics, energy storage, and electric vehicles) consist of fuses and contactors. Contactors primarily handle the connection and disconnection of currents up to the rated load, while fuses mainly provide protective disconnection under overload and short-circuit conditions. However, due to the uncertainty of fuse protection against low overload currents, the matching between the fuse and contactor fails to achieve full-range current protection. Furthermore, it cannot provide a safe and reliable isolation point in special accident situations (such as collisions involving electric vehicles). Additionally, the high resistance of fuses generates significant heat and power consumption during application, and the combination of these two devices presents complexity and a large space requirement.

[0003] Chinese patent application 202210250275.5 discloses a fuse-integrated contactor that integrates an explosive charge, an igniter, and a piston. The igniter ignites the explosive charge, causing a chemical reaction that releases high-pressure gas, which in turn drives the piston to move, forcibly separating the moving and stationary contact assemblies after the circuit is closed. After the circuit is closed, the coil remains energized, providing a continuous magnetic field force to the moving contact towards the stationary contact to maintain the closed state. When the piston is driven by the driving force to forcibly separate the moving and stationary contacts, the magnetic field force provided by the coil must be overcome for the contacts to disengage. A drawback is that under high current conditions, forcibly separating the moving contacts can generate a large electric arc between them. This arc may result in incomplete and unreliable circuit breaking, and can also cause component burn-out, creating a safety hazard. Summary of the Invention

[0004] This invention provides an integrated motion-driven excitation contactor that can perform the functions of a contactor during normal current switching and closing. In the event of overload or short circuit, it can connect to a fuse element via an excitation actuator, thereby disconnecting the moving contact bridge of the contactor and introducing a large current into the fuse element branch for arc extinguishing, improving the breaking capacity of traditional contactors. At the same time, it forms a large isolation gap between the moving and stationary contacts of the contactor, preventing arc reignition and contact welding between the contacts. Through integration technology, the functions of contactor, overload breaking, and zero-current interruption are integrated into one device, which is convenient to install, small in size, and does not require consideration of parameter matching between components.

[0005] To achieve the above objectives, the present invention provides an integrated motion-driven excitation contactor, comprising: a housing, and a drive system, a contact system, an excitation ignition assembly, a piston, an auxiliary contact assembly, a first reaction force elastic element, and at least one fuse element disposed within the housing; the contact system and the fuse element are respectively located on the same side of the drive system, and the excitation ignition assembly and the piston are respectively located on the other side of the drive system away from the contact system;

[0006] The contact system includes a moving contact bridge assembly and two stationary contacts, with one end of the stationary contacts facing the drive system located on the displacement path of the moving contact bridge assembly.

[0007] The fuse is connected in series with the auxiliary contact assembly. The two ends of the fuse and the auxiliary contact assembly are electrically connected to the two stationary contacts, respectively. The auxiliary contact assembly includes a stationary auxiliary contact and a moving auxiliary contact. In the initial position, the stationary auxiliary contact and the moving auxiliary contact are insulated from each other, and the stationary auxiliary contact is located on the displacement path of the moving auxiliary contact.

[0008] The drive system includes a drive coil, a moving iron core, a stationary iron core, and a moving guide rod. The moving iron core and the stationary iron core are respectively located in the hollow part of the drive coil, and the stationary iron core is located below the moving iron core. The piston is arranged corresponding to the stationary iron core. A first limiting structure is provided on the displacement path of the moving iron core to limit the displacement distance of the moving iron core during normal opening and closing.

[0009] One end of the moving guide rod is fixedly connected to the moving iron core, and the other end is provided with at least two impact ends at an insulated interval; the impact ends are respectively provided for the fuse and the moving auxiliary contact; the moving contact bridge assembly passes through the moving guide rod;

[0010] The first reaction elastic element is located between the moving iron core and the stationary iron core;

[0011] Under normal operating conditions, when the drive coil is energized and de-energized, the displacement of the moving iron core drives the moving contact bridge assembly to achieve normal opening and closing of the circuit breaker with respect to the stationary contact.

[0012] When an overload current, short-circuit current, or abnormal situation occurs, the excitation ignition assembly operates according to the received trigger signal, providing driving force to drive the piston to move. The piston sequentially drives the stationary iron core and the moving iron core to move, overcoming the limitation of the first limiting structure. The moving iron core drives the moving guide rod to move synchronously. The moving guide rod drives the moving auxiliary contact to make conductive contact with the stationary auxiliary contact, so that the fuse is connected in parallel to the main circuit where the contact system is located. Then, it continues to drive the moving contact bridge assembly to open with the stationary contact. Finally, the moving guide rod disconnects the fuse or the electrical circuit where the fuse is located.

[0013] Preferably, when there are two fuses, the two fuses are connected in series through two stationary auxiliary contacts. In the initial position, the two stationary auxiliary contacts are insulated from each other. When the excitation ignition assembly is activated, the moving guide rod drives the moving auxiliary contact to make conductive contact with the two stationary auxiliary contacts, so that the two fuses connected in series are connected and connected in parallel to the main circuit.

[0014] Preferably, the two stationary auxiliary contacts are conductive spring-loaded structures, and the two stationary auxiliary contacts are arranged in a trumpet shape; the moving auxiliary contact is a conductive post structure; when the moving guide rod moves toward the stationary contact, the moving guide rod drives the moving auxiliary contact to insert between the two stationary auxiliary contacts and make conductive contact with the two stationary auxiliary contacts.

[0015] Preferably, each of the two static auxiliary contacts has a boss structure on its opposite side.

[0016] Preferably, the moving auxiliary contact is disposed on one of the impact ends of the moving guide rod.

[0017] Preferably, a sleeve is provided in the hollow portion of the drive coil, the moving iron core and the first limiting structure are respectively disposed in the sleeve, the stationary iron core is located in the end of the hollow portion facing the piston, and a second limiting structure is provided in the hollow portion to limit the initial position of the stationary iron core.

[0018] Preferably, the first limiting structure is a limiting protrusion that is spaced apart on the inner wall of the sleeve.

[0019] Preferably, the first reaction elastic element is a spring.

[0020] Preferably, the fusible element includes an arc-extinguishing chamber filled with an arc-extinguishing medium and a molten body passing through the arc-extinguishing medium; the cavity containing the contact system includes a protective cover and a sealing cover, and the arc-extinguishing chamber, a displacement channel for cutting off the molten body, and a displacement channel for a moving auxiliary contact are disposed between the protective cover and the sealing cover; the molten body passes through the displacement channel for cutting off the molten body, and the stationary auxiliary contact is located in the displacement channel for the moving auxiliary contact; one end of the molten body is electrically connected to one of the stationary contacts, and the other end of the molten body is electrically connected to the stationary auxiliary contact; the impact end of the moving guide rod is respectively disposed corresponding to the displacement channel for cutting off the molten body and the displacement channel for the moving auxiliary contact.

[0021] Preferably, a melt cutter is provided in the displacement channel for melt switching, and the melt is located on the displacement path of the melt cutter; when the moving guide rod is displaced, the impact end corresponding to the melt cutter drives the melt cutter to disconnect the melt.

[0022] Preferably, the melt cutter is integrally formed with the protective cover, and the impact end on the moving guide rod can push the melt cutter to displace after disconnecting from the connection with the protective cover.

[0023] Preferably, the two stationary contacts are L-shaped at one end facing the drive system, and the moving contact bridge assembly is located in the cavity between the two ends of the two stationary contacts; when closing, the moving contact bridge assembly is displaced toward the drive system, and when opening, the moving contact bridge assembly is displaced away from the drive system.

[0024] The integrated motion-driven excitation contactor of this invention can perform the functions of a contactor during normal opening and closing. In the event of overload or short circuit, it can activate the ignition assembly and piston to drive the drive system and auxiliary contact assembly, first connecting the fuse in parallel, then forcibly opening the contactor's moving contact bridge assembly and stationary contact. The moving guide rod then cuts off the fuse or the electrical circuit containing the fuse to extinguish the arc. Simultaneously, a large isolation gap is formed between the contactor's moving and stationary contacts, preventing arc reignition and contact welding between the moving contact bridge and stationary contact. Furthermore, because the fuse... The broken component is not connected to the main circuit under normal operating current. Therefore, compared with the traditional combination of contactor and fuse in series, the power consumption and temperature rise of the excitation integrated contactor proposed in this invention can be greatly reduced. Moreover, in the event of special accidents (such as collisions involving electric vehicles), it can achieve zero-current circuit interruption and provide a safe and reliable large-break isolation. In addition, through integration technology, the contactor function, overload interruption function and zero-current interruption function are integrated into one device, which is easy to install, small in size, and does not require consideration of parameter matching between components.

[0025] By positioning the ignition assembly and piston away from the contact system, the high-pressure gas released by the ignition assembly is prevented from impacting the contact system. Attached Figure Description

[0026] Figure 1 This is the circuit schematic of the present invention; the ignition component is not triggered.

[0027] Figure 2 yes Figure 1 Circuit diagram after triggering.

[0028] Figure 3 yes Figures 1 to 2 The logic timing diagram.

[0029] Figure 4 This is a schematic diagram of the external structure of the present invention.

[0030] Figure 5 This is a longitudinal cross-sectional view of the present invention along the connecting line between the centers of the two stationary contacts.

[0031] Figure 6 This is a longitudinal cross-sectional view of the present invention along the line connecting the two stationary contacts perpendicular to each other and located at the center of the two stationary contacts.

[0032] Figure 7 This is a partially enlarged schematic diagram of the initial positions of the static auxiliary contact and the moving auxiliary contact.

[0033] 1. Stationary contact, 101 conductive contact end, 2. Moving contact bridge, 201 contact spring, 3. Moving guide rod, 4. Moving iron core, 5. Stationary iron core, 6. Excitation ignition assembly, 601 signal receiving end, 7. Stationary auxiliary contact, 8. Housing, 801 sealing partition, 802 protective cover, 803 sealing cover, 804, 805 arc extinguishing chamber, 806, 807 displacement channel, 808 moving auxiliary contact displacement channel, 809 melt cutting component, 810 guide structure, 9. Drive coil, 901 coil frame, 902 first limiting structure, 903 sleeve, 11 melt, 13 moving auxiliary contact, 14 melt, 15 first reaction force elastic component, 16 fuse. Detailed Implementation

[0034] The directional terms described in this invention are defined according to the directions shown in the accompanying drawings and do not constitute a limitation on the structural positional relationships of this invention.

[0035] The integrated motion-driven excitation contactor of the present invention includes: a housing, and a drive system, a contact system, an excitation ignition assembly, a piston, an auxiliary contact assembly, a first reaction force elastic element, and at least one fuse disposed in the housing; the contact system and the fuse are respectively located on the same side of the drive system, and the excitation ignition assembly and the piston are respectively located on the other side of the drive system away from the contact system;

[0036] The contact system includes a moving contact bridge assembly and two stationary contacts, with the end of the stationary contacts facing the drive system located on the displacement path of the moving contact bridge assembly;

[0037] The fuse and the auxiliary contact assembly are connected in series. The two ends of the fuse and the auxiliary contact assembly are electrically connected to two stationary contacts respectively. The auxiliary contact assembly includes a stationary auxiliary contact and a moving auxiliary contact. In the initial position, the stationary auxiliary contact and the moving auxiliary contact are insulated from each other, and the stationary auxiliary contact is located on the displacement path of the moving auxiliary contact.

[0038] The drive system includes a drive coil, a moving iron core, a stationary iron core, and a moving guide rod. The moving iron core and the stationary iron core are located in the hollow part of the drive coil, and the stationary iron core is located below the moving iron core. The piston is set corresponding to the stationary iron core. A first limiting structure is set on the displacement path of the moving iron core to limit the displacement distance of the moving iron core during normal opening and closing.

[0039] One end of the moving guide rod is fixedly connected to the moving iron core, and at least two impact ends are provided with an insulating interval on the other end; the impact ends are respectively provided for the fuse and the moving auxiliary contact; the moving contact bridge assembly is movably passed through the moving guide rod;

[0040] The first reaction elastic element is located between the moving iron core and the stationary iron core;

[0041] Under normal operating conditions, when the drive coil is energized and de-energized, the displacement of the moving iron core drives the moving contact bridge assembly to achieve normal opening and closing of the circuit breaker with respect to the stationary contact.

[0042] When an overload current, short-circuit current, or abnormal situation occurs, the excitation ignition assembly operates according to the received trigger signal, providing driving force to drive the piston to move. The piston sequentially drives the stationary iron core and the moving iron core to move to overcome the limit of the first limit structure, driving the moving iron core to move synchronously with the moving guide rod. The moving guide rod drives the moving auxiliary contact to make conductive contact with the stationary auxiliary contact, so that the fuse is connected in parallel to the main circuit where the contact system is located. Then, it continues to drive the moving contact bridge assembly to open with the stationary contact. Finally, the moving guide rod disconnects the fuse or the electrical circuit where the fuse is located.

[0043] A fuse is a fuse or a fusible element, such as a fusible element.

[0044] See Figure 1 and Figure 2 The diagram below illustrates the basic circuit principle of this invention. Taking a fuse 16 as an example, the fuse 16 can be a fusible conductor or a fusible fuse element, such as a fusible element. The fuse 16 is connected in series with the stationary auxiliary contact 7 of the auxiliary contact assembly. Both ends of the series-connected fuse 16 and stationary auxiliary contact 7 are electrically connected to two stationary contacts 1, respectively. The fuse 16 is then connected in parallel to the main circuit where the stationary contact and moving contact bridge assembly are closed. Under normal operating conditions, the stationary auxiliary contact 7 and moving auxiliary contact 13 of the auxiliary contact assembly are insulated, preventing the fuse 16 from being connected to the main circuit where the stationary contact and moving contact bridge assembly are closed. The contactor performs normal opening and closing operations, and the ignition assembly does not operate. Because the fuse 16 is not connected to the main circuit during normal contactor operation, there is no additional power consumption or temperature rise.

[0045] When the contactor is in the closed state, if an overload current, short circuit current, or abnormal situation occurs, the ignition assembly is activated to drive the piston to move. Before the contactor opens, the piston moves the moving auxiliary contact 13 to make conductive contact with the stationary auxiliary contact 7, so that the circuit of the fuse 16 connected in series with the auxiliary contact assembly is connected. The fuse 16 is connected in parallel to the main circuit formed by the closing of the moving contact bridge 2 and the stationary contact 1. Then, while keeping the fuse 16 connected in parallel to the main circuit, the piston moves to drive the moving contact bridge and the stationary contact to open and disconnect the main circuit. The piston continues to move, and after a large break is formed between the moving contact bridge and the stationary contact, the fuse 16 is mechanically disconnected.

[0046] See Figure 3 Its logical timing is as follows:

[0047] Before time t0, it is the normal closing operation period. When an overload current occurs, during the time period t0-t1, the excitation ignition component receives the trigger signal. At time t1, the excitation ignition component is triggered. During the time period t1-t2, the piston moves. During the time period t2-t4, the fusible link enters the main circuit. During the time period t2-t3, the moving contact bridge and the stationary contact lose their conductive contact, the main circuit is disconnected, and the current flows through the fusible link. During the time period t3-t4, the fusible link is disconnected, completely disconnecting the main circuit.

[0048] Compared to traditional contactors, this invention, while fulfilling the basic functions of contactor opening and closing, can force the contactor to open with a large break by connecting the ignition assembly and piston to the fuse 16 in case of overload or short circuit. Simultaneously, the fuse 16 extinguishes the arc, preventing reignition of the arc between the moving and stationary contacts and contact welding. Furthermore, since the fuse 16 is not connected to the main circuit under normal operating current, the power consumption and temperature rise of the proposed integrated contactor are significantly reduced compared to the traditional combination of contactor and fuse 16 in series. Moreover, in special accident situations (such as collisions involving electric vehicles), it can achieve zero-current circuit disconnection and provide a safe and reliable large-break isolation. Through integration technology, contactor functions, overload disconnection functions, and zero-current disconnection functions are integrated into a single device, making installation convenient, compact, and eliminating the need to consider parameter matching between components.

[0049] Regarding the above technical solution, preferred embodiments are now described in detail with reference to the figures.

[0050] See Figures 4 to 7 The device includes a housing 8 with cavities, which is divided into two cavities by a sealing partition 801: a top cavity and a bottom cavity. A protective cover 802 is provided on the sealing partition 801 in the top cavity, and the sealing cover forms a sealed cavity between the protective cover 802 and the sealing partition 801.

[0051] The contact system includes two stationary contacts 1 insulated from each other and a moving contact bridge assembly. The stationary contacts 1 are terminal blocks, passing through the top of the housing 8 and the top of the protective cover 802, and are fixed to these structures. One end of the stationary contact 1 extends beyond the top of the housing 8 and can be connected to an external circuit. The other end, facing the drive system, is located in the sealed cavity formed by the protective cover 802 and the sealing partition 801, and is bent into an L-shape to form a conductive contact end 101. The conductive contact ends 101 of the two stationary contacts 1 are insulated from each other. The moving contact bridge assembly is located between the two stationary contacts 1 and in the cavity between the conductive contact end 101 and the protective cover 802. That is, the moving contact bridge assembly is located in the space between the two ends of the stationary contacts 1, and the conductive contact end 101 is located on the displacement path of the moving contact bridge assembly. When the moving contact bridge assembly moves towards the drive system, it makes conductive contact with the conductive contact end 101 of the stationary contacts.

[0052] The drive system is located in the lower cavity below the sealing partition 801. The drive system includes a drive coil 9, a coil frame 901 on which the drive coil is wound, a moving iron core 4, a stationary iron core 5, and a moving guide rod 3. The coil frame 901 has a hollow portion extending through both ends. A sleeve 903 is disposed within the hollow portion of the coil frame 901, and the sleeve 903 is supported by the coil frame. The moving iron core 4 passes through the sleeve 903. The stationary iron core 5 is disposed at the open end of the hollow portion of the coil frame below the moving iron core 4. A first limiting structure 902 is disposed on the inner wall of the sleeve 903. The first limiting structure 902 is located on the path of the moving iron core 4's displacement towards the stationary contact, and is located on the side of the moving iron core's stop position during normal opening, thus limiting the displacement position of the moving iron core during normal opening. In this embodiment, the first limiting structure 902 is a spaced-apart protrusion structure. When a large isolation gap is formed between the stationary contact and the moving contact bridge assembly during forced tripping, the first limiting structure 902 can be disconnected from the sleeve 903 under the impact of the moving iron core 4, thus releasing the position restriction on the moving iron core 4.

[0053] The first limiting structure 902 can also be provided on the moving iron core 4. A limiting protrusion is provided on the outer periphery of the end of the moving iron core 4 facing the stationary iron core 5 to form the first limiting structure 902. The first limiting structure 902 is limited by the support structure of the sleeve 903 by the coil frame. When a large break is formed between the stationary contact and the moving contact bridge assembly during forced opening, the first limiting structure 902 on the moving iron core 4 breaks, releasing the position limitation on the moving iron core 4.

[0054] The stationary iron core 5 and the hollow part of the coil frame are provided with a second limiting structure to position the initial position of the stationary iron core 5. During normal opening and closing, the stationary iron core 5 remains stationary.

[0055] The second limiting structure can be a concave-convex structure, such as a limiting protrusion on the stationary iron core 5, or a limiting groove formed on the inner wall of the open end of the hollow part of the coil frame 901. The limiting protrusion of the stationary iron core 5 is set in the limiting groove of the coil frame 901 to form the second limiting structure, and the stationary iron core 5 is fixed to the coil frame 901 by a magnetic ring. Alternatively, the stationary iron core can be set on the coil frame in an interference fit.

[0056] The moving iron core 4 and the stationary iron core 5 each have a receiving groove on one of their opposite end faces. A first reaction elastic element 15 is disposed between the moving iron core 4 and the stationary iron core 5, with its two ends located in the receiving grooves of the moving iron core 4 and the stationary iron core 5, respectively. This position of the first reaction elastic element 15 is defined, and the first reaction elastic element 15 is always in a compressed state. In this embodiment, the first reaction elastic element 15 is a spring.

[0057] The moving guide rod 3 is fixedly connected to the moving iron core 4 at one end, and passes through the sealing partition 801, located in the sealed cavity formed by the protective cover and the sealing partition. One end of the moving guide rod 3 in the sealed cavity is provided with three spaced-apart impact ends: a first impact end 301, a second impact end 302, and a third impact end 303. The second impact end 302 is located between the first impact end 301 and the second impact end 303, forming a three-pronged structure. The moving auxiliary contact 13 is fixedly disposed on the end of the second impact end 302 furthest from the moving iron core.

[0058] A movable contact bridge assembly is fitted onto the movable guide rod 3, which is located in the sealed cavity formed by the protective cover and the sealing partition. The movable contact bridge assembly includes a movable contact bridge 2 and a contact spring 201. The movable contact bridge 2 is fitted onto the movable guide rod 3 and can slide relative to the movable guide rod 3. A third limiting structure is provided on the outer periphery of the movable guide rod 3 on the side of the movable contact bridge 2 facing the movable iron core 4, which limits the displacement position of the movable contact bridge 2. A contact spring 201 is fitted between the movable contact bridge 2 and the impact end of the movable guide rod 3, and the contact spring 201 is in a compressed state.

[0059] Grooves are respectively provided on the top end face of the protective cover 802 on both sides of the two stationary contacts 1 facing the outer shell 8. A sealing cover 803 is provided on the top of the protective cover 802. The two grooves on the protective cover 802 and the sealing cover 803 respectively form two arc extinguishing chambers (804, 805). The arc extinguishing chambers (804, 805) are located on opposite sides of the two stationary contacts 1, and are also located outside the displacement path of the moving contact bridge assembly, so as not to affect the displacement of the moving contact bridge assembly.

[0060] Displacement channels (806, 807) are respectively provided in the two arc-extinguishing chambers (804, 805). A moving auxiliary contact displacement channel 808 is formed between the two arc-extinguishing chambers (804, 805) to allow the moving auxiliary contact 13 to move. The moving auxiliary contact displacement channel 808 is located between the two stationary contacts 1. The displacement channels (806, 807) and the moving auxiliary contact displacement channel 808 are respectively connected to the sealed cavity formed by the protective cover 802 and the sealing partition 801. The arc-extinguishing chambers (804, 805) are respectively filled with an arc-extinguishing medium, which can be solid or liquid, such as solid quartz sand or liquid arc-extinguishing gel.

[0061] A molten element 11 is inserted into the arc-extinguishing chamber 804, passing through the displacement channel 806; a molten element 14 is inserted into the arc-extinguishing chamber 805, passing through the displacement channel 807. The molten elements 11 and 14 are located between the protective cover and the sealing cover, respectively. One end of the molten element 11 is electrically connected to a stationary contact 1, and one end of the molten element 14 is electrically connected to another stationary contact 1. The other ends of the molten elements 11 and 14 are electrically connected to stationary auxiliary contacts 7, which are fixed by the mating surface of the sealing cover 803 and the protective cover 802. One end of the stationary auxiliary contacts 7 connected to the molten elements 11 and 14 enters the moving auxiliary contact displacement channel 808, and they are relatively insulated from each other within the moving auxiliary contact displacement channel 808. The two stationary auxiliary contacts 7 are made of conductive material and have a conductive spring structure. Conductive protrusions are pressed onto the surface of the conductive spring structure of the stationary auxiliary contacts 7. The purpose of the conductive protrusions is to facilitate conductive contact with the moving auxiliary contact by sliding contact. The two stationary auxiliary contacts 7 located in the moving auxiliary contact displacement channel 808 have a trumpet-shaped structure. The larger end of the trumpet-shaped structure faces the moving contact bridge side to facilitate the moving auxiliary contact entering between the two stationary auxiliary contacts 7.

[0062] The molten elements (11, 14), the arc-extinguishing chambers (804, 805), and the arc-extinguishing medium each form two fuse structures. The molten elements (11, 14) are respectively provided with a narrow neck and a mechanical break weak point, which are located in the arc-extinguishing medium in the arc-extinguishing chamber.

[0063] Two fuse structures are connected in series via stationary auxiliary contacts. The two ends of the two series-connected fuses are electrically connected to the two stationary contacts 1. In the initial and normal operating states, the two stationary auxiliary contacts 7 are insulated and disconnected; that is, the two fuse structures are not connected to the main circuit formed by the stationary contacts and the moving contact bridge. Only when the moving auxiliary contact 13 connects the two stationary auxiliary contacts 7 can the two series-connected fuses be connected to the main circuit in parallel through the auxiliary contact system. The resistance of the fusible elements (11, 14) is much greater than the resistance of the main circuit formed after the stationary contacts and the moving contact bridge make conductive contact.

[0064] A melt cutter 809 is provided in each of the displacement channels (806, 807), and the melt (11, 14) is located on the displacement path of the melt cutter 809. The melt cutter 809 is integrally formed with the protective cover, and the connection between the melt cutter 809 and the protective cover is the weak point of disconnection. The melt (11, 14) are located on the displacement path of the melt cutter 809. When the first impact end and the third impact end on the moving guide rod drive the melt cutter 809 in the displacement channels (806, 807) respectively, the melt cutter 809 is displaced after disconnecting from the weak point of disconnection, thus disconnecting the melt. The melt cutter 809 can also be set separately from the protective cover. The initial positioning of the melt cutter 809 is determined by the mating surface between the protective cover and the sealing cover. For example, a limiting protrusion can be set on the outer periphery of the melt cutter 809, and a limiting recess can be set on the mating surface between the protective cover and the sealing cover. The limiting protrusion on the outer periphery of the melt cutter 809 is set in the limiting recess to limit the initial position of the melt cutter 809. Of course, the melt cutter 809 can also be omitted, and the melt (11, 14) can be cut by the first impact end and the third impact end of the moving guide rod alone.

[0065] The first impact end 301 and the third impact end 303 of the moving guide rod 3 are respectively set to the displacement channels (806, 807), and the melt (11, 14) in the displacement channels are respectively located on the displacement paths of the first impact end 301 and the third impact end 303.

[0066] The second impact end 302, carrying the moving auxiliary contact 13, is positioned corresponding to the moving auxiliary contact displacement channel 808, with two stationary auxiliary contacts 7 located on the displacement path of the moving auxiliary contact 13. To facilitate the moving auxiliary contact 13's easier entry between the two flared stationary auxiliary contacts 7 and the formation of reliable contact, the end of the moving auxiliary contact 13 facing the stationary auxiliary contacts has a cone-like structure.

[0067] When closing, the drive coil is energized, and the stationary iron core 5 attracts the moving iron core 4. The moving iron core 4, along with the moving guide rod 3 and the moving contact bridge 2, moves towards the stationary iron core 5. The moving contact bridge 2 makes conductive contact with the conductive contact end 101 of the stationary contact 1. The first reaction force elastic element 15 and the contact spring 201 are further compressed. When opening, the drive coil is de-energized, the stationary iron core 5 loses its attraction, and the moving iron core 4, under the elastic force of the first reaction force elastic element 15, moves away from the stationary iron core 5, along with the moving guide rod 3 and the moving contact bridge 2. The moving contact bridge 2 disengages from the stationary contact 1, achieving normal opening. During normal opening, the first and third impact ends on the moving guide rod 3 do not contact the fusible element cutting element 809, the moving auxiliary contact 13 does not contact the stationary auxiliary contact 7, and the fusible elements 11 and 14 are not connected to the main circuit where the moving contact bridge and stationary contact are located during closing.

[0068] A guide structure 810 is provided in the outer casing 8 below the stationary iron core 5. The guide structure 810 contacts the magnetic ring and provides support for the magnetic ring. The hollow part of the guide structure 810 is positioned directly opposite the stationary iron core 5.

[0069] Piston 10 is disposed in guide structure 810, facing stationary iron core 5. When piston 10 moves, it enters the hollow part of coil frame and drives stationary iron core 5 to move after overcoming the limitation of the second limiting structure. Piston 10 is in sealed contact with the inner wall of guide cylinder. The sealed contact can be achieved by providing a seal on the contact surface between piston and guide cylinder, or by a tight fit.

[0070] The excitation ignition assembly 6 is disposed in the housing 8 below the piston 10. The driving force release end of the excitation ignition assembly 6 is located in the guide cylinder structure and is positioned towards the piston 10. A sealed cavity is formed between the excitation ignition assembly 6 and the piston 10. The signal receiving end 601 of the excitation ignition assembly 6 is located on the outside of the housing 8.

[0071] The excitation ignition assembly 6 is a gas generating device. The excitation ignition assembly 6 can act according to the received trigger signal and release high-pressure gas as driving force.

[0072] Working principle:

[0073] Under normal working conditions:

[0074] When the drive coil is energized, the stationary iron core 5 attracts the moving iron core 4 and moves downward. The moving iron core 4 drives the moving guide rod 3 and the moving contact bridge 2 to move downward together. The moving contact bridge makes conductive contact with the stationary contact, realizing normal closing. At this time, the displacement of the moving iron core causes the first reaction force elastic element 15 to be in a compressed state. At the same time, the contact spring is also in a further compressed state.

[0075] When the drive coil is de-energized, the elastic force of the first reaction elastic element 15 drives the moving iron core 4 to move the moving guide rod 3 away from the stationary iron core 5 and move upward, so that the moving contact bridge and the stationary contact are separated from the conductive contact, thus realizing normal circuit breaking.

[0076] When the main circuit experiences overload, short-circuit current, or abnormal conditions (such as a car collision), the excitation ignition assembly 6 activates according to the received trigger signal, releasing high-pressure gas as driving force to drive the piston 10 to move. The piston 10 drives the stationary iron core 5 and the moving iron core 4 to overcome the limit displacement. Since the moving contact bridge and the moving guide rod 3 are in movable contact and the contact spring 201 is in a further compressed state, when the moving iron core 4 drives the guide rod 3 to start moving, the moving contact bridge does not move and remains in the closed state with the stationary contact. The displacement of the moving guide rod carries the displacement of the moving auxiliary contact 13 to make conductive contact with the two stationary auxiliary contacts 7, connecting the two series-connected fuses in parallel to the main circuit where the stationary contact and the moving contact bridge are located. As the moving guide rod continues to move, the contact spring causes the moving contact bridge 2 to disengage from the stationary contact 1, thus opening the circuit and disconnecting the main circuit. The current flowing through the main circuit then flows through the fuse elements (11, 14) of the two fuses connected in series. When there is an overload current, after the moving contact bridge and the stationary contact disengage from the conductive contact, the fuse elements (11, 14) will melt first under the action of the large current. In abnormal situations, the fuse elements (11, 14) will not melt.

[0077] The piston continues to drive the stationary and moving iron cores, displacing the moving guide rod and increasing the opening distance between the moving contact bridge and the stationary contact. This creates a large-break opening between the moving contact bridge and the stationary contact. The two impact ends of the moving guide rod drive the melt cut-off element 809 to displace after disconnecting from the protective cover. The melt cut-off element 809 then disconnects the melt elements (11, 14), achieving zero-current disconnection of the main circuit. The disconnection point of the melt elements (11, 14) is located in the arc-extinguishing medium, and the arc generated there is extinguished by the arc-extinguishing medium.

[0078] Large-break tripping can prevent arc reignition and contact welding between the moving contact bridge and stationary contact of the contactor.

[0079] The contact system and arc-extinguishing chamber are located in a sealed cavity, which can further enhance the arc-extinguishing capability.

[0080] Since the fuse is not connected to the main circuit under normal operating current, the power consumption and temperature rise of the excitation integrated contactor proposed in this invention can be greatly reduced compared to the traditional combination of contactor and fuse in series. Moreover, in the event of a special accident (such as a collision involving an electric vehicle), it can achieve zero-current circuit interruption and provide a safe and reliable large-break isolation. In addition, through integration technology, the functions of contactor, overload interruption and zero-current interruption are integrated into one device, which is easy to install, small in size, and does not require consideration of parameter matching between components.

[0081] In the above embodiment, two fuses are connected in series via auxiliary contact assemblies and in parallel to the main circuit via the same auxiliary contact assembly. In other embodiments, a single fuse can be provided, with one end of the fuse electrically connected to one of the stationary contacts, and the stationary auxiliary contact assembly electrically connected to the other stationary contact. The stationary auxiliary contact and the end of the fuse element not electrically connected to the stationary contact are relatively insulated from each other. A moving auxiliary contact and a corresponding impulse terminal of a fuse are provided on the moving guide rod. When the moving guide rod is displaced, the moving auxiliary contact can electrically connect the relatively insulated ends of the fuse element and the stationary auxiliary contact, connecting the fuse in parallel to the main circuit, and the fuse is disconnected by the impulse terminal.

[0082] Alternatively, there can be multiple fuses and multiple sets of auxiliary contact assemblies, with the multiple fuses connected in parallel to the main circuit through the multiple sets of auxiliary contact assemblies. Or, with multiple fuses, as shown in the above embodiments, two fuses connected in series through auxiliary contact assemblies form a group, and multiple groups can be arranged side-by-side. A moving auxiliary contact assembly can be provided on the moving guide rod, making conductive contact with multiple stationary auxiliary contacts to achieve parallel connection of multiple fuses to the main circuit. Alternatively, multiple moving auxiliary contact assemblies can be provided on the moving guide rod, each corresponding to a set of stationary auxiliary contact assemblies.

[0083] When multiple fuses are installed, multiple impact ends are installed on the moving guide rod corresponding to the fuses.

Claims

1. An integrated motion-driven excitation contactor, characterized in that it includes: The housing, and the drive system, contact system, excitation ignition assembly, piston, auxiliary contact assembly, first reaction elastic element and at least one fuse element disposed in the housing; The contact system and the fuse are located on the same side of the drive system, and the excitation ignition assembly and the piston are located on the other side of the drive system away from the contact system. The contact system includes a moving contact bridge assembly and two stationary contacts, with one end of the stationary contacts facing the drive system located on the displacement path of the moving contact bridge assembly. The fuse is connected in series with the auxiliary contact assembly. The two ends of the fuse and the auxiliary contact assembly are electrically connected to the two stationary contacts, respectively. The auxiliary contact assembly includes a stationary auxiliary contact and a moving auxiliary contact. In the initial position, the stationary auxiliary contact and the moving auxiliary contact are insulated from each other, and the stationary auxiliary contact is located on the displacement path of the moving auxiliary contact. The drive system includes a drive coil, a moving iron core, a stationary iron core, and a moving guide rod. The moving iron core and the stationary iron core are respectively located in the hollow part of the drive coil, and the stationary iron core is located below the moving iron core. The piston is arranged corresponding to the stationary iron core. A first limiting structure is provided on the displacement path of the moving iron core to limit the displacement distance of the moving iron core during normal opening and closing. One end of the moving guide rod is fixedly connected to the moving iron core, and the other end is provided with at least two impact ends at an insulated interval; the impact ends are respectively provided for the fuse and the moving auxiliary contact; the moving contact bridge assembly passes through the moving guide rod; The first reaction elastic element is located between the moving iron core and the stationary iron core; Under normal operating conditions, when the drive coil is energized and de-energized, the displacement of the moving iron core drives the moving contact bridge assembly to achieve normal opening and closing of the circuit breaker with respect to the stationary contact. When an overload current, short-circuit current, or abnormal situation occurs, the excitation ignition assembly operates according to the received trigger signal, providing driving force to drive the piston to move. The piston sequentially drives the stationary iron core and the moving iron core to move, overcoming the limitation of the first limiting structure. The moving iron core drives the moving guide rod to move synchronously. The moving guide rod drives the moving auxiliary contact to make conductive contact with the stationary auxiliary contact, so that the fuse is connected in parallel to the main circuit where the contact system is located. Then, it continues to drive the moving contact bridge assembly to open with the stationary contact. Finally, the moving guide rod disconnects the fuse or the electrical circuit where the fuse is located.

2. The integrated motion-type excitation contactor according to claim 1, characterized in that, when there are two fuses, the two fuses are connected in series through two stationary auxiliary contacts, and in the initial position, the two stationary auxiliary contacts are insulated from each other; when the excitation ignition assembly is activated, the moving guide rod drives the moving auxiliary contact to make conductive contact with the two stationary auxiliary contacts, so that the two fuses connected in series are connected, and the two fuses connected in series are connected in parallel to the main circuit.

3. The integrated motion excitation contactor according to claim 2, characterized in that, The two stationary auxiliary contacts are conductive spring-loaded structures, and the two stationary auxiliary contacts are arranged in a trumpet shape; the moving auxiliary contact is a conductive post structure; when the moving guide rod moves toward the stationary contact, the moving guide rod drives the moving auxiliary contact to insert between the two stationary auxiliary contacts and make conductive contact with the two stationary auxiliary contacts.

4. The integrated motion excitation contactor according to claim 3, characterized in that, Each of the two static auxiliary contacts has a boss structure on its opposite side.

5. The integrated motion excitation contactor according to claim 1, characterized in that, The moving auxiliary contact is disposed on one of the impact ends of the moving guide rod.

6. The integrated motion-type excitation contactor according to claim 1, characterized in that, A sleeve is provided in the hollow part of the drive coil, the moving iron core and the first limiting structure are respectively disposed in the sleeve, the stationary iron core is located in the end of the hollow part facing the piston, and a second limiting structure is provided in the hollow part to limit the initial position of the stationary iron core.

7. The integrated motion excitation contactor according to claim 6, characterized in that, The first limiting structure consists of limiting protrusions spaced apart on the inner wall of the sleeve.

8. The integrated motion excitation contactor according to claim 1, characterized in that, The first reaction force elastic element is a spring.

9. The integrated motion excitation contactor according to claim 1, characterized in that, The fuse includes an arc-extinguishing chamber filled with an arc-extinguishing medium and a molten material passing through the arc-extinguishing medium; the cavity containing the contact system includes a protective cover and a sealing cover, and the arc-extinguishing chamber, a displacement channel for cutting off the molten material and a displacement channel for a moving auxiliary contact are provided between the protective cover and the sealing cover, the molten material passes through the displacement channel for cutting off the molten material, and the stationary auxiliary contact is located in the displacement channel for the moving auxiliary contact; One end of the melt is electrically connected to one of the stationary contacts, and the other end of the melt is electrically connected to the stationary auxiliary contact; the impact end of the moving guide rod is respectively set to correspond to the displacement channel for cutting off the melt and the displacement channel of the moving auxiliary contact.

10. The integrated motion excitation contactor according to claim 9, characterized in that, A melt cutter is provided in the displacement channel for melt switching, and the melt is located on the displacement path of the melt cutter; when the moving guide rod is displaced, the impact end corresponding to the melt cutter drives the melt cutter to disconnect the melt.

11. The integrated motion-type excitation contactor according to claim 10, characterized in that, The melt cutter is integrally formed with the protective cover, and the impact end on the moving guide rod can push the melt cutter to displace after it is disconnected from the protective cover.

12. The integrated motion-type excitation contactor according to any one of claims 1 to 11, characterized in that, The two stationary contacts are L-shaped with their ends facing the drive system, and the moving contact bridge assembly is located in the cavity between the two ends of the two stationary contacts. When the circuit is closed, the moving contact bridge assembly is displaced toward the drive system, and when the circuit is opened, the moving contact bridge assembly is displaced away from the drive system.

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