Breaking integrated contactor

Abstract

The invention relates to the field of circuit protection, in particular to a breaking integrated contactor which comprises a magnetic driving system and a contact system, the contact system comprises a moving contact assembly and two static contact assemblies, each static contact assembly comprises a static contact, an excitation ignition assembly and a piston, and each static contact assembly comprises a static contact and a conducting bar. A conducting bar of at least one static contact assembly is correspondingly provided with a piston; when the excitation ignition assembly acts according to a received trigger signal, the driving force is released, the driving force drives the piston to move, the impact end of the piston cuts off the conducting bar corresponding to the impact end, and a conductive loop conducted after the moving contact assembly and the static contact assembly are in conductive contact is cut off. By cutting off the conducting bar of the static contact assembly, large current can be broken, the breaking reliability is improved, and the response speed is increased.

Description

Technical Field

[0001] The present invention relates to the field of circuit protection, and in particular to a contactor for circuit protection, specifically, a breaking integrated contactor. Background Art

[0002] The protection measures for DC loop systems (especially in wind power, photovoltaic, energy storage, electric vehicles, etc.) are fuses plus contactors. The contactor mainly undertakes the connection and disconnection of currents at and below the rated load, and the fuse mainly undertakes the protective disconnection in case of overload and short circuit. The matching situation between the two devices of the fuse and the contactor results in the inability to achieve full-range current protection, and at the same time, it is impossible to provide a safe and reliable isolation break in the face of special accident situations (such as a collision of an electric vehicle). Moreover, there are also complexities and large space occupation in the assembly and space use of the two devices.

[0003] Chinese Patent Application No. 202210250275.5 discloses a fuse integrated contactor, which integrates an explosive package, an igniter, and a piston in the contactor. The igniter ignites to drive the explosive package to undergo a chemical reaction to release high-pressure gas as a driving force, driving the piston to move, and forcing the moving contact and the static contact assembly after closing to separate from contact. After the contactor is closed, the coil is always energized to provide a continuous magnetic force towards the static contact for the moving contact to maintain the closed state. When driving the piston to move through the driving force to force the static and moving contacts to separate after closing, it is necessary to overcome the magnetic force provided by the coil in order to separate the static and moving contacts from conductive contact. Its existing defect is that in the case of large current, forcing the moving contact to separate will generate a large arc between the static and moving contacts. The existence of the large arc may lead to incomplete and unreliable circuit breaking, and at the same time cause ablation of the device, resulting in potential safety hazards. Summary of the Invention

[0004] The object of the present invention is to integrate an excitation module on the contactor, so that when the contactor breaks a large current, the generated arc is very small or even no arc is generated, the breaking reliability is high, and the safety performance is improved.

[0005] To achieve the above object, the technical solution provided by the present invention is a breaking integrated contactor, including a magnetic drive system and a contact system. The contact system includes a moving contact assembly and two static contact assemblies. The static contact assembly includes a static contact. Under normal working conditions, the magnetic drive system drives the moving contact assembly and the static contact assembly to close and open. It further includes: an excitation ignition assembly and a piston, wherein:

[0006] Each of the static contact assemblies includes a static contact and a conductive bar electrically connected to the static contact. The other ends of the conductive bars corresponding to the two static contacts respectively serve as the connection ends of the breaking integrated contactor. Alternatively, one static contact assembly includes a static contact and a conductive bar electrically connected thereto, and the other static contact assembly includes a static contact and a terminal electrically connected to the static contact. The other ends of the conductive bar and the terminal respectively serve as the connection ends of the breaking integrated contactor;

[0007] At least one piston is correspondingly arranged at the conductive bar of the static contact assembly;

[0008] When the excitation ignition assembly operates according to the received trigger signal and releases the driving force, the driving force drives the piston to displace, and the impact end of the piston cuts off the corresponding conductive bar, disconnecting the conductive loop conducted after the moving contact assembly and the static contact assembly are in conductive contact.

[0009] Preferably, when there are two or more pistons:

[0010] One piston is correspondingly arranged for each conductive bar of each static contact. When the driving force drives the piston to displace, the conductive bars corresponding to the pistons are disconnected successively or simultaneously;

[0011] Alternatively, one piston is correspondingly arranged for the moving contact assembly and at least one conductive bar of the static contact respectively; when the driving force drives the piston to displace, the conductive bar corresponding to the piston is first disconnected, and then the moving contact assembly corresponding to the piston is pushed to displace and separate from the static contact assembly;

[0012] Alternatively, while disconnecting the conductive bar corresponding to the piston, the moving contact assembly is pushed to displace and separate from the static contact assembly.

[0013] Preferably, when there is one piston arranged corresponding to the moving contact assembly, the distance between the piston corresponding to the conductive bar and the conductive bar is less than the distance between the piston corresponding to the moving contact assembly and the moving contact assembly, so that after the conductive bar is first disconnected, the moving contact assembly and the static contact assembly are separated.

[0014] Preferably, when there is one piston arranged corresponding to the moving contact assembly, on the current-carrying path of applying the driving force to the piston arranged corresponding to the moving contact assembly, a gas deflector for reducing the gas flow rate is arranged. The gas deflector gradually increases the driving force applied to the piston arranged corresponding to the moving contact assembly, so that the piston arranged corresponding to the conductive bar acts first and the piston arranged corresponding to the moving contact assembly acts later.

[0015] Preferably, when there is a piston arranged corresponding to the moving contact assembly, a gas guide plate for reducing the gas flow rate is arranged on the current-carrying path for applying a driving force to the piston arranged corresponding to the moving contact assembly. A spring is arranged on the piston corresponding to the moving contact assembly. The gas guide plate causes the driving force applied to the piston arranged corresponding to the moving contact assembly to gradually increase. The elastic force of the spring can cancel out a part of the driving force applied to the piston arranged corresponding to the moving contact assembly, so that the piston arranged corresponding to the conductive bar moves first, and the piston arranged corresponding to the moving contact assembly moves later.

[0016] Preferably, when there is a piston arranged corresponding to the moving contact assembly, a spring is arranged on the piston corresponding to the moving contact assembly. The elastic force of the spring can cancel out a part of the driving force applied to the piston arranged corresponding to the moving contact assembly, so that the piston arranged corresponding to the conductive bar moves first, and the piston arranged corresponding to the moving contact assembly moves later.

[0017] Preferably, when there are two or more pistons,

[0018] the pistons are combined to form a composite piston with an integral structure. The number of impact ends on the composite piston is at least the same as the number of the pistons, and the impact ends on the composite piston are in the same direction as the corresponding directions of the pistons;

[0019] The conductive bar of each static contact is respectively arranged corresponding to the impact end of a composite piston. When the composite piston displaces, the conductive bar corresponding to the impact end of the composite piston is disconnected successively or simultaneously; or,

[0020] The moving contact assembly and the conductive bar of at least one static contact are respectively arranged corresponding to the impact end of a composite piston; when the composite piston displaces, the impact end first disconnects the conductive bar corresponding to it, and then pushes the moving contact assembly corresponding to it to displace and separate from the static contact assembly. Or, when the impact end disconnects the conductive bar corresponding to the impact end of the composite piston, it simultaneously pushes the moving contact assembly to displace and separate from the static contact assembly.

[0021] Preferably, an arc extinguishing device is also arranged at the conductive bar of the static contact assembly provided with the piston. The arc extinguishing device is used for auxiliary arc extinguishing after the piston disconnects the conductive bar.

[0022] Preferably, the arc extinguishing device is one of the following structural forms or a combination of multiple structural forms:

[0023] The arc extinguishing device includes an arc extinguishing chamber and an arc extinguishing melt. The arc extinguishing chamber is filled with an arc extinguishing medium. After passing through the arc extinguishing chamber, the arc extinguishing melt is connected in parallel at both ends of the corresponding conductive bar disconnected by the piston.

[0024] Alternatively, the arc extinguishing device is a metal wire mesh structure, and the metal wire mesh structure is located on the outer periphery of the piston displacement path after the conductive bar is disconnected.

[0025] Alternatively, the arc extinguishing device is an arc extinguishing grid structure, and the arc extinguishing grid structure is located on the outer periphery of the piston displacement path after the conductive bar is disconnected.

[0026] Alternatively, the arc extinguishing device includes a metal wire mesh structure and an arc extinguishing melt. After passing through the metal wire mesh structure, the arc extinguishing melt is connected in parallel at both ends of the corresponding conductive bar disconnected by the piston.

[0027] When the arc extinguishing device includes an arc extinguishing melt, after the piston cuts off the conductive bar, it cuts off the arc extinguishing melt connected in parallel on the conductive bar.

[0028] Preferably, when the magnetic force drive system is an electromagnetic drive system, the wire connecting the drive coil of the electromagnetic drive system to the power supply can be disconnected by at least one of the pistons.

[0029] Preferably, the contact system, the excitation ignition device, the piston, and the arc extinguishing device are arranged in a sealed chamber structure within the housing of the disconnecting integrated contactor, and the sealed chamber structure is filled with a gas arc extinguishing medium.

[0030] Preferably, the sealed chamber structure is divided into two mutually insulated chambers by a partition. The moving contact assembly and the static contact are located in the same chamber, and the arc extinguishing device, the excitation ignition assembly, the piston, and the disconnection location of the conductive bar are located in the same chamber.

[0031] Preferably, when the piston moves to the termination position, its position is locked.

[0032] Preferably, when the piston moves to the termination position, its position locking can be achieved by the piston being in interference fit with the termination position or a hook structure.

[0033] Preferably, when the excitation ignition assembly receives a trigger signal, the magnetic force drive system receives a tripping signal to drive the moving contact assembly to separate from the static contact assembly and break the conductive contact.

[0034] The breaking integrated contactor of the present invention integrates an excitation component in the contactor. When the circuit is in an overloaded or abnormal situation (such as a collision accident of a new energy vehicle or certain specific situations where the circuit needs to be disconnected), the excitation component can disconnect the conductive bar connecting the static contact assembly to the circuit and the arc extinguishing fuse in the shortest response time, cut off the main circuit, and extinguish the arc through the arc extinguishing device, making the arc generated in the main circuit very small or even non-existent, improving the breaking reliability and safety. At the same time, the response speed is increased, the possibility of the moving and static contacts rebounding and reconnecting the circuit after separating from the conductive contact is avoided, and the breaking reliability is improved. By cooperating the excitation component with the magnetic drive system of the contactor itself, the breaking of a large range of currents is realized, making the breaking more reliable and improving the breaking capacity and the breaking current range. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a schematic diagram of the external structure of the present invention.

[0036] Figure 2 is a schematic diagram of the sectional structure of the single piston of the present invention.

[0037] Figure 3 is a schematic diagram of the arc extinguishing chamber structure with quartz sand as the arc extinguishing medium.

[0038] Figure 4 is a schematic diagram of the arc extinguishing chamber structure with a metal wire mesh as the arc extinguishing medium.

[0039] Figure 5 is a schematic diagram of the arc extinguishing chamber structure with an arc extinguishing grid as the arc extinguishing medium.

[0040] Figure 6 is a schematic diagram of the structure where a piston and an arc extinguishing device are respectively arranged at the conductive bars of two static contact assemblies.

[0041] Figure 7 is a schematic diagram of the structure where pistons are respectively arranged at the conductive bar of one static contact assembly and the corresponding position of the moving contact assembly, in the normal opening state, and the two pistons do not move.

[0042] Figure 8 is Figure 7 a schematic diagram of the structure in the normal closing state of, and the two pistons do not move.

[0043] Figure 9 is a schematic diagram of the structure after the two pistons move, forming a large break greater than the break at normal opening between the moving contact assembly and the static contact.

[0044] Figure 10 is a schematic diagram of the contactor structure with three pistons.

[0045] Figure 11It is a partial structural schematic diagram in which a spring and a gas deflector are provided at the piston position corresponding to the moving contact assembly.

[0046] Figure 12 It is Figure 11 a three-dimensional structural schematic diagram.

[0047] Figure 13 It is a structural schematic diagram in which two pistons are integrated into a first composite piston. Among them, one impact end is arranged corresponding to the busbar, and one impact end is arranged corresponding to the moving contact assembly.

[0048] Figure 14 It is a structural schematic diagram in which two pistons are integrated into a second composite piston. Among them, two impact ends are arranged corresponding to the busbar.

[0049] Figure 15 It is a structural schematic diagram in which three pistons are integrated into a third composite piston. Among them, two impact ends are arranged corresponding to the busbar, and one impact end is arranged corresponding to the moving contact assembly.

[0050] Figure 16 It is a structural schematic diagram in which a wire disconnecting component is provided on the coil connection wire of the magnetic drive system.

[0051] Figure 17 It is a contactor operation logic timing diagram with a piston arranged corresponding to the busbar.

[0052] Figure 18 It is a contactor operation logic timing diagram with pistons arranged corresponding to the busbar and the moving contact assembly.

[0053] Reference numerals:

[0054] housing 100, sleeve 101;

[0055] magnetic drive system 200, drive coil 201, moving iron core 202, drive coil connection wire 2011, wire disconnecting component 2012;

[0056] contact system 300, moving contact assembly 301, static contact 351, busbar 352, contactor connection end 3521, weak disconnection point 3522, horizontal section part 3523

[0057] excitation ignition component 400;

[0058] piston 500, spring 520, gas deflector 530;

[0059] arc extinguishing device, arc extinguishing chamber 601, arc extinguishing fuse 602, metal wire mesh structure 604, arc extinguishing grid structure 605, fuse disconnection component 606;

[0060] The first composite piston 700, the impact end 701 of the first composite piston, the impact end 702 of the first composite piston, the groove 703, the second composite piston 720, the impact end 721 of the second composite piston, the impact end 722 of the second composite piston, the guide post 723, the third composite piston 740, the impact end 741 of the third composite piston, the impact end 742 of the third composite piston, the impact end 743 of the third composite piston. Detailed implementation mode

[0061] The breaking integrated contactor of the present invention includes a magnetic drive system and a contact system. The contact system includes a moving contact assembly and two static contact assemblies. The static contact assembly includes a static contact. In the normal working state, the magnetic drive system drives the moving contact assembly and the static contact assembly to close and open. It further includes: an excitation ignition assembly and a piston, wherein:

[0062] Each static contact assembly respectively includes a static contact and a conductive bar electrically connected to the static contact. The other ends of the conductive bars corresponding to the two static contacts are respectively used as the connection ends of the breaking integrated contactor. Or, one static contact assembly includes a static contact and a conductive bar electrically connected thereto, and the other static contact assembly includes a static contact and a terminal electrically connected to the static contact. The other ends of the conductive bar and the terminal are respectively used as the connection ends of the breaking integrated contactor;

[0063] A piston is correspondingly arranged at the conductive bar of at least one static contact assembly;

[0064] When the excitation ignition assembly acts according to the received trigger signal and releases the driving force, the driving force drives the piston to displace, and the impact end of the piston cuts off the conductive bar corresponding to it, disconnecting the conductive loop conducted after the moving contact assembly and the static contact assembly are in conductive contact.

[0065] For the above technical solution, preferred embodiments are now given and described in detail with reference to the drawings.

[0066] Refer to Figure 1 and Figure 2 , the breaking integrated contactor of the present invention includes a housing 100. The housing 100 includes a bottom cavity and a sealed chamber structure. The sealed chamber structure is separated by a partition to form two mutually insulated cavities. One cavity is an intermediate cavity, and the other is a top cavity. The intermediate cavity is adjacent to the bottom cavity.

[0067] A magnetic drive system 200 is arranged in the bottom cavity, a contact system 300 is arranged in the intermediate cavity, an excitation ignition assembly 400, a piston 500, and an arc extinguishing device are arranged in the top cavity. A gas arc extinguishing medium is filled in the sealed chamber structure 102. The gas arc extinguishing medium is nitrogen or an inert gas mixture. The sealed chamber structure 102 is preferably encapsulated with epoxy resin, and ceramic encapsulation can also be used.

[0068] In the illustrated embodiments of the present invention, it is arranged in this way, but in some other embodiments, the contents arranged in each chamber of the housing can be adjusted.

[0069] The magnetic drive system 200 and the contact system 300 are prior art of contactors. Only a simple description of their structures is given here: The contact system 300 includes a moving contact assembly 301 and a static contact assembly. The contacts are made of red copper or copper alloy materials, and silver alloy contacts are welded to the ends of the contacts. The static contact assembly includes a static contact 351 and a conductive bar 352. The static contact and the conductive bar 352 are integrally formed. One end of the conductive bar 352 extends out of the housing 100 as the connection end of the contactor and can be connected to an external circuit or a conductive connection device. The static contact 351 is fixedly arranged in the chamber where the contact system 300 is located. The conductive bar 352 passes through the partition 103 of the sealed chamber, is arranged in the chamber where the piston 500 and the arc extinguishing device are located, and extends out of the housing to serve as the contactor connection end 3521. The two static contacts 351 and the conductive bar 352 are arranged opposite to each other at intervals. The moving contact assembly 301 is arranged opposite to the two static contacts 351, and the moving contact assembly 301 straddles the gap between the two static contacts 351. The magnetic drive system 200 drives the contact system 300 to close and open. The magnetic drive system 200 is energized to close, de-energized to open. The magnetic drive system 200 is an electromagnetic drive or a permanent magnet drive, realizing the closing and opening of the moving and static contacts under normal working conditions (under rated load). The normal closing and opening signals of the contactor can send closing and opening instructions to the magnetic drive system 200 through an external control module. When there is an overload, short-circuit current, or abnormal situation when the contactor is closed, a tripping instruction is sent to the excitation ignition assembly 400 through the external control module; when there is an overload or short-circuit current, a tripping instruction can also be sent to the excitation ignition assembly 400 through the internal control module integrated inside.

[0070] The excitation ignition assembly 400, which is a gas generating device in this embodiment, can be ignited according to the received trigger signal and release high-pressure gas as the driving force. The excitation ignition assembly 400 is in the top chamber. It can be arranged at the top of the housing or on the side of the housing, as long as it can provide driving force for the piston.

[0071] The trigger signal of the excitation ignition assembly can send a trigger signal to the signal receiving end of the excitation ignition assembly through the external control module, or can also send a trigger signal through the internal control module integrated in itself. When sending a trigger signal through the internal control module, the contactor also integrates a detection device connected to the internal control module inside. The detection device is used to detect the current signal or voltage signal of the circuit and send it to the internal control module. When the detected current signal or voltage signal exceeds the set value, the internal control module sends a trigger signal to the excitation ignition assembly 400.

[0072] Under normal operating conditions, the internal control module does not send a trigger signal to the excitation ignition component. Only when an overload or short-circuit current occurs, the internal control module is triggered and sends a trigger signal to the excitation ignition component 400. For example, the internal control module includes a magnetic trip device (equivalent to a current detection device) and a signal trigger circuit arranged on the static contact component. When an overload or short-circuit current occurs, the magnetic trip device operates to conduct the signal trigger circuit, and then a signal is sent to the excitation ignition component through the signal trigger circuit.

[0073] The magnetic trip device includes a static magnetic conductor arranged around the static contact component and a moving magnetic conductor arranged on one side of the static magnetic conductor. When an overload or short-circuit current occurs, the static magnetic conductor adsorbs the moving magnetic conductor. When the moving magnetic conductor displaces, it drives the switch of the signal trigger circuit to close, conducts the signal trigger circuit, and then sends a signal to the excitation ignition component through the signal trigger circuit.

[0074] When an overload or short-circuit current occurs, the external control module or the internal control module can send a trigger signal. Or when an abnormal situation occurs, such as an accident (vehicle collision, abnormal ambient temperature, etc.), the external control module sends a trigger signal to the excitation ignition component 400. When the excitation ignition component 400 is arranged on the housing, a sealed contact is maintained between its contact surface with the housing to prevent the high-pressure gas released by the excitation ignition component 400 from overflowing outside the housing, causing a safety hazard.

[0075] The piston 500 is made of an insulating material. In order to make the cavity between the piston 500 and the excitation ignition component 400 a sealed cavity, a sealed contact is made between the contact surface of the piston 500 and the housing 100. The sealed contact is achieved by: setting a seal at the contact surface between the piston 500 and the housing, or by using an interference fit method to achieve contact sealing. Under normal operating conditions, the piston 500 is fixedly arranged at the initial position. In order to keep the piston 500 at the initial position under normal operating conditions, it is achieved through a limiting structure or the interference fit between the piston 500 and the housing. The limiting structure is generally implemented by an uneven structure. For example, a limiting groove is arranged on the housing, and a limiting protrusion is arranged at the corresponding position of the piston. The position of the piston is limited by the limiting protrusion being stuck in the limiting groove.

[0076] The impact end of the piston 500 is arranged facing the part of the conductive bar to be disconnected. When the piston 500 is driven by a driving force, the piston 500 can displace and disconnect the conductive bar 352 from the part of the conductive bar 352 to be disconnected. A weak disconnection part is arranged at the part of the conductive bar 352 to be disconnected to reduce the mechanical strength of the part of the conductive bar to be disconnected, so that it can be disconnected immediately when impacted by the piston. The disconnected part of the conductive bar moves along the designed disconnection movement trajectory until the termination position.

[0077] The piston 500 can also be arranged relative to the moving contact assembly. When the piston 500 is driven by the driving force released by the exciting ignition assembly 400, the piston 500 can compulsorily push the moving contact assembly to displace, so that it is separated from the static contact assembly and the conductive contact is broken.

[0078] In the present invention, first, it is necessary to satisfy that the piston 500 and the arc extinguishing device are arranged on the busbar of a static contact assembly. Secondly, the piston 500 can be arranged on the busbars of all static contact assemblies, or the piston 500 can be arranged corresponding to the moving contact assembly. When overload, short-circuit current or abnormal conditions occur (such as vehicle collision, etc.), the busbar of the static contact assembly can be cut off by the piston 500 at the fastest response speed, and the main circuit is disconnected. In order to form multiple break points, the moving contact assembly can be pushed to be separated from the static contact assembly and the conductive contact is broken later, or when the busbar of the static contact assembly is disconnected, the moving contact assembly is synchronously pushed to be separated from the static contact assembly and the conductive contact is broken. In the present invention, it is preferably to first disconnect the busbar of the static contact assembly and then push the moving contact assembly to be separated from the static contact assembly and the conductive contact is broken.

[0079] Arc extinguishing device, at least one arc extinguishing device is arranged in the contactor. The arc extinguishing device can include an arc extinguishing chamber 601 and an arc extinguishing fuse 602, see Figure 3。The arc extinguishing melt 602 is connected in parallel at both ends of the part of the conductive bar 352 that needs to be disconnected, that is, both ends of the arc extinguishing melt 602 are located on both sides of the part of the conductive bar 352 that needs to be disconnected. In this way, it can be ensured that after the conductive bar is disconnected, the current flowing through the conductive bar will flow through the arc extinguishing melt 602. The resistance of the arc extinguishing melt 602 is much greater than that of the conductive bar 352 to ensure that under normal working conditions, the current flows through the static contact and the conductive bar, and only after the conductive bar is disconnected, the current will flow through the arc extinguishing melt 602 for current limiting. The arc extinguishing chamber 601 is filled with an arc extinguishing medium. In this embodiment, the arc extinguishing medium is quartz sand. The arc extinguishing melt 602 passes through the arc extinguishing medium in the arc extinguishing chamber 601, so that the disconnected part of the arc extinguishing melt 602 is located in the arc extinguishing medium to assist in arc extinguishing through the arc extinguishing medium. A melt disconnecting component 606 is clamped on the arc extinguishing melt 602 corresponding to the piston 500. A channel for the displacement of the melt disconnecting component 606 is provided in the housing. The initial position of the melt disconnecting component 606 adopts a limiting structure, which can be realized by a groove and protrusion structure, or by interference fit or other structural methods. After the piston 500 disconnects the conductive bar 352, the melt disconnecting component 606 drives the melt disconnecting component 606 to disconnect the arc extinguishing melt for arc extinguishing. There can be one or more arc extinguishing melts 602, which is determined according to design requirements. In order to ensure that the disconnected part of the arc extinguishing melt is located in the arc extinguishing chamber, a weak disconnecting point is provided on the arc extinguishing melt. By providing the arc extinguishing melt, after disconnecting the conductive bar of the static contact component connected to the main circuit, the parallel melt can be cut off in stages, and zero-current cutting of the main circuit can be achieved. The arc extinguishing device can also remove the arc extinguishing chamber, and a metal wire mesh structure is provided on the inner wall or in the chamber where the arc extinguishing melt is located. When the arc extinguishing melt is disconnected, the generated arc can be cut, cooled, and extinguished by the metal wire mesh. The arc extinguishing chamber can also be removed, and an arc extinguishing grid structure is provided in the chamber where the arc extinguishing melt is located. When the arc extinguishing melt is disconnected, the generated arc can be cut, cooled, and extinguished by the metal wire mesh.

[0080] The arc extinguishing device can also be without an arc extinguishing melt, such as Figure 4 the metal wire mesh structure 604 in []. The metal wire mesh is preferably made of copper wire or stainless steel wire, and the metal wire mesh is used for cooling and extinguishing the arc. The metal wire mesh is located on the outer periphery of the piston displacement path after the conductive bar is disconnected.

[0081] The arc extinguishing device can also be without an arc extinguishing melt, such as Figure 5 the arc extinguishing grid structure 605 shown in []. The arc extinguishing grid 605 is a plurality of metal grid sheets arranged at intervals and arranged in a manner conducive to arc extinguishing, and its arrangement method satisfies the cutting, cooling, and extinguishing of the arc. For example, the arc extinguishing grid is located on the outer periphery of the piston displacement path after the conductive bar is disconnected.

[0082] The arc extinguishing device may also include an arc extinguishing chamber and an arc extinguishing fuse. A metal wire mesh structure or an arc extinguishing grid structure is provided in the arc extinguishing chamber, and a gas arc extinguishing medium is filled in the arc extinguishing chamber. The arc extinguishing fuse is connected in parallel at both ends of the corresponding conductive busbar disconnected by the piston.

[0083] The arc extinguishing device may also include an arc extinguishing chamber and an arc extinguishing fuse. A metal wire mesh structure is provided in the arc extinguishing chamber. After passing through the metal wire mesh structure, the arc extinguishing fuse is connected in parallel at both ends of the corresponding conductive busbar disconnected by the piston.

[0084] When the arc extinguishing device includes an arc extinguishing fuse, after the piston cuts off the conductive busbar, the arc extinguishing fuse connected in parallel on the conductive busbar is cut off.

[0085] When a piston 500 is correspondingly provided on the conductive busbar 352 of the static contact assembly, correspondingly, at least one arc extinguishing device is provided.

[0086] The following gives a preferred embodiment and specific description in conjunction with the drawings. In the following embodiments, there are two static contact assemblies, and the arc extinguishing device is in the structural form of an arc extinguishing chamber and a parallel fuse. In other embodiments, there may be one static contact assembly, and the arc extinguishing device may also be a metal wire mesh or an arc extinguishing grid. An abnormal situation refers to an accident occurring (such as a collision of a new energy vehicle) or a certain special condition being set (such as a fire, the ambient temperature exceeding the set value). The excitation ignition assembly 400 is provided at the top and is located in the top chamber. In the following examples, the abnormal situation will not be described again.

[0087] When the piston 500 is provided as one, see Figure 2, there are two static contact assemblies 300. Each set of static contact assemblies includes a static contact 351 and a bus bar 352. The two static contact assemblies are arranged oppositely at intervals. The static contact 351 is arranged in the middle chamber, and the bus bar 352 passes through the top chamber and bends out of the housing 100 from both sides at the top of the top chamber. One end of the bus bar 352 located outside the housing 100 is the contactor connection end 3521. A break-weakening part 3522 for reducing mechanical strength is provided on the bus bar 352 of one of the static contact assemblies located in the top chamber. A piston 500 is provided on one side of the break-weakening part 3522 of the bus bar 352. The impact end of the piston 500 is arranged facing the break-weakening part of the bus bar, and the piston 500 is sealed with the inside of the housing 100 through a seal. An arc extinguishing device is provided on the other side of the break-weakening part 3522 of the bus bar 352. The arc extinguishing device is composed of an arc extinguishing chamber 601 and an arc extinguishing fuse 602. The arc extinguishing fuse 602 is connected in parallel on both outer sides of the break-weakening part 3522 of the bus bar. The excitation ignition assembly 400 is arranged in the top chamber. Its signal receiving end is located outside the housing 100 and can be connected to an external trigger signal control source. The driving force release end of the excitation ignition assembly 400 is located in the top chamber, and there is a sealed cavity reserved between the driving force release end of the excitation ignition assembly 400 and the piston 500. When the excitation ignition assembly 400 acts according to the received trigger signal, releases high-pressure gas as the driving force, drives the piston 500 to displace against the limit structure, sequentially cuts off the break-weakening part 3522 of the bus bar, and then pushes the fuse disconnecting assembly 606 to act against the limit structure to disconnect the arc extinguishing fuse 602. The disconnecting part of the arc extinguishing fuse 602 is in the arc extinguishing medium of the arc extinguishing chamber, and arc extinguishing is assisted by the arc extinguishing medium.

[0088] Figure 2 Working principle of the structure:

[0089] Under normal working conditions, the magnetic drive system drives the contact system to close and open according to the closing and opening commands; in the normal closing working state, current flows through the bus bar, static contact, moving contact, static contact and bus bar.

[0090] When there is an overload, short - circuit current, or abnormal situation, the excitation ignition component ignites according to the received trigger signal, releases high - pressure gas as the driving force, drives the piston to displace against the limiting structure, disconnects the conductive bar at the weak point to form an isolation break. When the piston disconnects the conductive bar of the static contact component, almost all the current on the conductive bar is transferred to the arc - extinguishing melt. Therefore, the arc generated at the isolation break of the conductive bar is very small and can be easily extinguished by air. Then, it further pushes the melt disconnecting component to disconnect the arc - extinguishing melt to form a break. Since the resistance of the arc - extinguishing melt is much greater than that of the conductive bar, the current flowing through the arc - extinguishing melt is reduced several times. The arc generated at the break of the arc - extinguishing melt is relatively small, and the break of the arc - extinguishing melt is located in the arc - extinguishing medium, and the arc at the break of the arc - extinguishing melt is extinguished through the arc - extinguishing medium. Due to the existence of the arc - extinguishing melt, zero - current interruption of the circuit is achieved, improving the breaking capacity.

[0091] Figure 2 Among them, through an excitation ignition component and a piston, the conductive bar and the arc - extinguishing melt of one of the static contact components are disconnected successively, realizing the breaking under overload, short - circuit current or abnormal conditions, achieving zero - current interruption of the main circuit, and improving the breaking range and breaking capacity of the contactor.

[0092] When two pistons are provided, refer to Figure 6 On the basis of Figure 2 a piston 500 and an arc - extinguishing device are correspondingly arranged on the conductive bar 352 of the other static contact component. In the embodiment of Figure 6 , it includes an excitation ignition component 400, two pistons 500, and two arc - extinguishing devices. Disconnection weak points 3522 are respectively arranged on the conductive bars 352 of each group of static contact components. Two pistons 500 are arranged at intervals between the conductive bars 352 of the two static contact components, and there is a gap between the two pistons 500. The driving - force release end of the excitation ignition component 400 is located in the gap between the two pistons 500, and a sealed cavity is formed between the driving - force release end of the excitation ignition component 400 and the two pistons 500.

[0093] When the excitation ignition component 400 acts according to the received trigger signal, releases high - pressure gas as the driving force, the driving force drives the two pistons 500 to displace, and the two pistons 500 simultaneously and successively disconnect the corresponding conductive bar 352 and the arc - extinguishing melt 602.

[0094] Figure 6 The working principle of

[0095] Under normal working conditions, the magnetic - drive system drives the contact system to close and open according to the closing and opening commands; in the normal closing working state, the current flows through the conductive bar, static contact, moving contact, static contact, and conductive bar.

[0096] When there is an overload, short - circuit current, or abnormal situation, the excitation ignition component ignites according to the received trigger signal, releases high - pressure gas as the driving force, drives two pistons to displace against the limit structure, first breaks the weak part of the conductive bar to form a break, forms two isolation breaks on the main circuit. When forming the two isolation breaks, almost all the current on the conductive bar is transferred to the arc - extinguishing melt. Therefore, the arc generated at the isolation break of the conductive bar is very small and is easily extinguished by air; then it pushes the melt breaking component to break the arc - extinguishing melt to form a break. Since the resistance of the arc - extinguishing melt is much greater than that of the conductive bar, the current flowing through the arc - extinguishing melt is reduced several times, and the arc generated at the break of the arc - extinguishing melt is relatively small. Moreover, the break of the arc - extinguishing melt is located in the arc - extinguishing medium and is easily extinguished by the arc - extinguishing medium. The zero - current cut - off of the circuit is achieved by the break of the arc - extinguishing melt.

[0097] Two series - connected isolation breaks are formed on the main circuit by two pistons 500 for voltage division. At the same time, the current is limited by the arc - extinguishing melt, reducing the voltage at the break, making the generated arc smaller and making arc extinguishing easier, achieving the purpose of interrupting large currents and improving the breaking capacity.

[0098] When two pistons are provided, see Figures 7 to 9 , on the basis of Figure 2 , an additional piston 500 corresponding to the moving contact component 301 is added. Both pistons 500 are located between the two static contact components. The piston 500 provided for the moving contact component 301 is located between the top chamber and the middle chamber and is in sealed contact with the sealed chamber 102. Even during the displacement of the piston 500, it remains in sealed contact with the sealed chamber 102. See Figure 7 and Figure 8 , which is a schematic structural diagram of the normal working state when the two pistons 500 do not act. A sealed cavity is formed between the excitation ignition component 400 and the two pistons 500.

[0099] When the two pistons 500 act, preferably, the piston 500 first breaks the conductive bar 352 and then pushes the moving contact component to disengage from the static contact component to break the conductive contact. It is also possible that the piston 500 breaks the conductive bar 352 while pushing the moving contact component to disengage from the static contact component.

[0100] The advantage of the piston 500 first breaking the conductive bar 352 and then pushing the moving contact component to disengage from the static contact component is that when the conductive bar 352 is broken, almost all the current is transferred to the arc - extinguishing melt, and the arc at the break of the conductive bar is very small. The break of the arc - extinguishing melt can be extinguished by the arc - extinguishing device, improving the breaking capacity.

[0101] Breaking the conductive bar first and then pushing the moving contact component can be achieved in the following ways:

[0102] The distance between the impact end of the piston 500 corresponding to the conductive busbar 352 and the conductive busbar is smaller than the distance between the piston 500 corresponding to the moving contact assembly 301 and the moving contact assembly 301. The purpose is that after the excitation ignition assembly 400 releases the driving force according to the received trigger signal, the two pistons 500 are driven to act simultaneously. The piston 500 with a smaller distance from the conductive busbar disconnects the conductive busbar first, and the piston 500 with a larger distance from the moving contact assembly then pushes open the moving contact assembly to disconnect the conductive contact with the static contact assembly.

[0103] Alternatively, a current-limiting channel is provided between the piston 500 corresponding to the moving contact assembly and the excitation ignition device, so that the gas driving force acting on the piston 500 corresponding to the moving contact assembly gradually increases to overcome the limiting structure and cause its displacement, thereby realizing the later action of the piston 500 corresponding to the moving contact assembly.

[0104] Alternatively, a spring is provided at the piston 500 corresponding to the moving contact assembly to offset part of the driving force through the spring, so that it acts later.

[0105] Forcing the moving contact assembly to disconnect the conductive contact with the static contact assembly through the piston 500 can form a large break when the insulation distance between the moving contact assembly and the static contact assembly is greater than the distance during normal opening. The large break between the moving and static contacts can avoid the re-ignition of the arc between the contacts of the contactor and the welding of the contacts.

[0106] Working principle:

[0107] Under normal working conditions, the magnetic drive system drives the contact system to open and close according to the opening and closing instructions; in the normal closing working state, the current flows through the conductive busbar, static contact, moving contact, static contact and conductive busbar.

[0108] When there is an overload, short-circuit current, or abnormal situation, the excitation ignition assembly releases the driving force according to the received trigger signal. The driving force drives the piston corresponding to the conductive busbar to disconnect the conductive busbar first. When the conductive busbar is disconnected, almost all of the current is transferred to flow through the static arc extinguishing fuse. Therefore, the arc when the conductive busbar is disconnected is very small and is easily extinguished by the air; then the arc extinguishing fuse is disconnected to extinguish the arc. At the same time as the arc extinguishing fuse is disconnected, the piston corresponding to the moving contact assembly drives the moving contact assembly to disconnect the conductive contact with the static contact, forming a large break greater than that during normal opening between the moving and static contacts, thereby forming three breaks in the main circuit (one break on the conductive busbar and two breaks between the moving and static contacts). The voltage-sharing effect of the series breaks and the current-limiting effect of the arc extinguishing fuse make the arc at the break smaller. The arc at the break of the arc extinguishing fuse is extinguished by the arc extinguishing medium, and the arc at the break formed by the moving and static contacts is extinguished by the gas arc extinguishing medium filled in the sealed chamber structure. The zero-current disconnection of the circuit is achieved through the arc extinguishing fuse.

[0109] When three pistons are provided, see Figure 10 at Figure 7On this basis, a piston 500 and an arc extinguishing device are added at the bus bar 352 of another static contact component. The contactor is provided with an excitation ignition component 400, three pistons 500, and two arc extinguishing devices. The corresponding pistons 500 and arc extinguishing devices are respectively arranged on both sides of the bus bar 352. The three pistons are located between the two static contact components, and the two arc extinguishing devices are located outside the bus bar 352. Among them, the two pistons 500 corresponding to the bus bars 352 of the two static contact components are relatively spaced and arranged in the top chamber, and the other piston 500 corresponding to the moving contact component 301 extends into the middle chamber. The three pistons 500 are in sealed contact with the sealed chamber 102. A gap is formed between the three pistons 500, and the driving force release end of the excitation ignition component 400 is located in the gap, making the structure more compact. A sealed cavity is formed between an excitation ignition component and the three pistons. The excitation ignition component ignites according to the received trigger signal, releases the driving force, and drives the three pistons 500 to act respectively. Among them, the two pistons 500 first cut off the corresponding bus bars 352, forming two breaks on the main circuit. Since when the two pistons 500 cut off the corresponding bus bars 352, almost all the current flowing through the bus bar flows through the arc extinguishing fuse 602, and in addition, the two breaks formed on the bus bar are connected in series and have a voltage dividing effect. Therefore, under the action of the arc extinguishing fuse shunt and the series break voltage division, the arcs at the two breaks formed at the bus bar are very small and are easily extinguished by air; after the break of the bus bar, the piston drives the fuse disconnecting component to disconnect the arc extinguishing fuse 602. At the same time, the piston corresponding to the moving contact component pushes the moving contact component to separate from the static contact component to form a large break. Since multiple series breaks are formed after the disconnection of the arc extinguishing fuse and between the moving and static contacts, the arc becomes smaller after the current limiting of the arc extinguishing fuse and the voltage division of multiple series breaks, and is extinguished by the arc extinguishing medium and the gas arc extinguishing medium. Through three excitation components, four breaks are formed on the main circuit, and the voltage of the arc is reduced by the voltage division of multiple series breaks to improve the breaking capacity.

[0110] In this embodiment, preferably, the bus bar is disconnected first, or the moving and static contacts are separated from conductive contact. Of course, it is also possible that the disconnection of the bus bar and the separation of the moving and static contacts from conductive contact are carried out simultaneously. However, in this case, only the voltage of the arc is reduced by the voltage division of multiple series breaks, and the arc extinguishing effect of the arc extinguishing fuse shunt and current limiting cannot be utilized.

[0111] In order to disconnect the bus bar first and then separate the moving and static contacts from conductive contact, the following method is adopted:

[0112] The distance between the impact end of the piston 500 corresponding to the conductive bar 352 and the conductive bar is smaller than the distance between the piston 500 corresponding to the moving contact assembly 301 and the moving contact assembly 301. The purpose is that after the excitation ignition assembly 400 releases the driving force according to the received trigger signal, the three pistons 500 are driven to act simultaneously. The two pistons 500 with a smaller distance from the conductive bar disconnect the conductive bar first, and the piston 500 with a larger distance from the moving contact assembly then pushes the moving contact assembly to disengage from the static contact assembly and break the conductive contact.

[0113] It is also possible to set a spring, a gas deflector, or a combination of a spring and a gas deflector to gradually increase the driving force applied to the piston 500 of the corresponding moving contact assembly 301, so that the piston 500 of the corresponding moving contact assembly 301 acts after the piston corresponding to the conductive bar, realizing that the conductive bar is disconnected first and the moving contact assembly and the static contact assembly are then switched off.

[0114] See Figure 11 and Figure 12 , the piston 500 has a convex structure, and the small end is the impact end. A spring 520 is sleeved on the outer periphery of the impact end of the piston 500 corresponding to the moving contact assembly 301. The spring 520 is located on the displacement path of the piston 500, and the spring 520 forms a support for the piston 500. When the piston 500 displaces, the spring 520 is compressed, causing the spring 520 to generate an elastic force opposite to the driving force released by the excitation ignition assembly 400. The generated elastic force cancels out a part of the driving force initially applied to the piston 500, making it take longer for the driving piston 500 to overcome the limit structure that maintains its initial position, thereby extending the time for the piston 500 to displace to the moving contact assembly 301, realizing that the conductive bar is disconnected first and the moving and static contacts are then disengaged from the conductive contact.

[0115] See Figure 11 and Figure 12, a gas deflector 530 can also be provided in front of one end of the piston 500 corresponding to the moving contact assembly 301 facing the excitation ignition assembly 400, and the gas deflector 530 is fixed on the sealed cavity structure. The gas deflector 530 covers most of the gas flow passage between the excitation ignition assembly 400 and the piston 500 of the corresponding moving contact assembly 301, so that the high-pressure gas released by the excitation ignition assembly 400 can only be applied to the piston 500 through the narrow passage at the gas deflector 530. When the excitation ignition assembly 400 acts to release the driving force, the pressure of the high-pressure gas entering between the piston 500 and the gas deflector 530 through the narrow passage at the gas deflector 530 is buffered, and the pressure of the high-pressure gas applied to the piston for the first time is reduced and not enough to overcome the initial limit structure of the piston and the elastic force of the spring at the first time. Only when the high-pressure gas passing through the narrow passage at the gas deflector 530 accumulates and the gas pressure applied to the piston 500 gradually increases to be able to overcome the initial limit structure and the elastic force of the spring, will the piston 500 displace to push the moving thick head assembly to separate from the static contact to form a large break.

[0116] The spring 520 can also not be provided and only the gas deflector is provided to achieve this. It is also possible to make the gas deflector completely cover the gas flow passage between the excitation ignition assembly 400 and the piston 500 of the corresponding moving contact assembly 301, but several through holes are opened on the gas deflector so that part of the high-pressure gas passes through the through holes of the gas deflector.

[0117] See Figure 13 , take Figures 7 to 9The pistons corresponding to the conductive bars of two static contact assemblies and the pistons corresponding to the moving contact assembly are combined to form an independent first composite piston 700. The first composite piston 700 has two independent impact ends (701, 702). Among them, the impact end 701 is arranged corresponding to the conductive bar 352 of one of the static contact assemblies, and the impact end 702 passes through the partition between the top chamber and the middle chamber and is arranged corresponding to the moving contact assembly 301. There is an interference fit between the impact end 702 and the partition, and the limit of the first composite piston 700 is realized through the interference fit structure. Both impact ends (701, 702) are arranged on one end of the first composite piston 700 facing the moving contact assembly 301. Since the moving contact assembly 301 is located in the middle chamber and the conductive bar of the static contact assembly is located in the top chamber, it is required that the impact end 702 corresponding to the moving contact assembly extends into the middle chamber through the partition, and the impact end 701 corresponding to the conductive bar is located in the top chamber. Therefore, the length of the impact end 702 corresponding to the moving contact assembly is longer than the length of the impact end 701 corresponding to the conductive bar 352. In order to ensure that the impact end 701 corresponding to the conductive bar can disconnect the conductive bar, the conductive bar corresponding to the impact end 701 is horizontally bent outward, so that the first composite piston 700 is located outside the bent part of the conductive bar 352, and the arc extinguishing device is located inside the bent part, so that the horizontal section part 3523 at the bent part of the conductive bar faces the impact end 701.

[0118] A sleeve 101 is provided in the top chamber. The upper end of the sleeve 101 is turned outwards to form a limiting edge, and the limiting edge of the sleeve 101 is clamped in the top chamber to fix the sleeve 101. A groove 703 is provided at one end of the first composite piston 700 facing the excitation ignition assembly 400. A limiting ring groove is provided at the bottom of the groove 703 corresponding to the position of the sleeve 101. In the initial position of the first composite piston 700 under normal working conditions, the sleeve 101 is inserted into the limiting ring groove of the first composite piston 700, and the limiting of the first composite piston 700 is realized through the contact between the sleeve 101 and the limiting ring groove, and the first composite piston 700 displaces relative to the sleeve 101. A sealed cavity is formed between the first composite piston 700 and the excitation ignition assembly 400 through the sleeve 101. Due to the dimensional errors and fitting errors between various components, the actual fit between the first composite piston 700 and the sleeve 101 may be a small clearance fit. The existence of the small clearance needs to satisfy that the driving force released by the excitation ignition assembly 400 is sufficient to push the first composite piston 700 to displace and cut off the busbar, and push the moving contact assembly to separate from the static contact assembly. The excitation ignition assembly 400 acts according to the received trigger signal, releases the driving force into the sleeve 101, and the driving force drives the first composite piston 700 to displace along the sleeve 101. The impact end 701 sequentially cuts off the busbar and the parallel fuse, and the impact end 702 pushes the moving contact assembly to force the moving contact assembly to separate from the static contact assembly in terms of electrical conduction. The distances of the impact end 701 and the impact end 702 of the first composite piston 700 from the busbar and from the moving contact assembly can be designed according to the sequential disconnection order. In this application, the busbar needs to be disconnected first. In Figure 13 In the embodiment, the two pistons are combined into one, reducing the number of pistons and the number of components, and reducing the assembly error.

[0119] See Figure 14 , combine Figure 6 the two pistons corresponding to the busbars of the two static contact assemblies in respectively, to form an independent second composite piston 720. The second composite piston 720 is provided with impact ends, and the number of the impact ends provided is the same as the number of the pistons combined into the second composite piston 720, and the corresponding setting directions of the impact ends are also the same as the corresponding setting directions of the pistons combined into the second composite piston 720.

[0120] The second composite piston 720 includes two impact ends (721, 722), which are arranged on both sides of one end of the second composite piston 720 facing the moving contact assembly. A guide post 723 is arranged between the two impact ends (721, 722). The busbars 352 of the two static contact assemblies are respectively bent horizontally outward to form bent portions, and the two busbars after bending form an inverted convex shape. A break-weakening portion 3522 is arranged at the horizontal section portion 3523 of the bent portion of the busbar 352. The second composite piston 720 is arranged outside the bent portion of the busbar. The break-weakening portion 3522 is arranged at the horizontal section portion 3523 of the bent portion of one busbar 352 corresponding to each of its two impact ends (721, 722). The arc extinguishing device is arranged inside the bent portion of the busbar. The guide post 723 is located between the two busbars 32, and the guide post 723 is in interference fit with the busbar to realize the limit of the second composite piston 720.

[0121] A sleeve 101 is arranged in the top chamber. The upper end of the sleeve 101 turns outwards to form a limiting edge, and the limiting edge of the sleeve 101 is clamped in the top chamber to fix the sleeve 101. A groove is opened at one end of the second composite piston 720 facing the excitation ignition assembly 400, and a limiting ring groove is opened at the position corresponding to the sleeve 101 at the bottom of the groove. In the initial position of the second composite piston 720 under normal working conditions, the sleeve 101 is inserted into the limiting ring groove of the second composite piston 720, and the second composite piston 720 displaces relative to the sleeve 101. A sealed cavity is formed between the second composite piston 720 and the excitation ignition assembly 400. Due to the dimensional errors and fitting errors between various components, the actual fit between the first composite piston 700 and the sleeve 101 may be a small clearance fit. The existence of the clearance ensures that the driving force released by the excitation ignition assembly 400 is sufficient to push the first composite piston 700 to displace, cut off the busbar, and push the moving contact assembly and the static contact assembly to trip. The excitation ignition assembly 400 acts according to the received trigger signal, releases the driving force into the sleeve 101, and the driving force drives the second composite piston 720 to displace along the sleeve 101, and the two impact ends (721, 722) sequentially cut off the corresponding busbars and parallel fuses.

[0122] The distances between the two impact ends (721, 722) of the second composite piston 720 and the corresponding busbars can be the same or different. When the distances are the same, the two impact ends (721, 722) simultaneously disconnect the corresponding busbars. When the distances are different, the two impact ends (721, 722) disconnect the corresponding busbars successively.

[0123] See Figure 15 In Figure 14On the basis of this, the guide post 723 is extended to form an impact end 743, and the third impact end 743 extends into the intermediate chamber and is correspondingly arranged with the moving contact assembly to form a third composite piston 740. Figure 13 On the basis of Figure 10 this, three pistons are combined into a third composite piston 740, which has three impact ends (741, 742, 743). When the excitation ignition assembly 400 operates according to the received trigger signal, after the two impact ends (741, 742) of the third composite piston 740 disconnect the corresponding busbars, the impact end 743 then pushes the moving contact assembly.

[0124] The distances from the three impact ends of the third composite piston 740 to the corresponding busbars and the distance to the moving contact assembly can be the same or different; when the distances are the same, when the three impact ends simultaneously disconnect the corresponding busbars, the moving contact assembly and the static contact assembly are tripped; when the distances are different, the corresponding busbars are simultaneously or successively disconnected first, and finally the moving contact assembly and the static contact assembly are tripped.

[0125] Figure 13 and Figure 14 and Figure 15 In the embodiments of

[0126] the above Figure 2 and Figures 6 to 15 the purpose is to reduce the number of pistons, simplify the number of components, shorten the assembly cycle, reduce the assembly error, reduce the product volume, and lower the production cost.

[0127] In some embodiments, when the magnetic drive system 200 is an electromagnetic drive, on the basis of the above various embodiments, refer to Figure 16 , the connecting wire 2011 of the drive coil is introduced into the top chamber, and a wire disconnecting assembly 2012 can also be provided on the wire 2011. In this case, when there is an overload or abnormal situation, the magnetic drive coil does not need to receive a tripping instruction. When the excitation ignition assembly receives the trigger signal and operates, releases the driving force, drives the piston to first cut off the busbar, and at the same time cuts off the arc extinguishing fuse, it also pushes the wire disconnecting assembly provided on the wire 2011 to disconnect the wire 2011 of the drive coil, so that the drive coil is powered off, and then the moving and static contacts are tripped.

[0128] In each of the above embodiments, when the piston moves to the end position, it is locked by the locking mechanism, and the piston will not rebound. For example, when the piston moves to the end position, interference fit with the end position is used to achieve locking, or a hook structure is used to achieve locking.

[0129] Refer to Figure 17 , which is a timing logic diagram of the operation of a contactor. In this timing logic diagram, no piston is provided for the moving contact assembly, and a piston is only provided for the busbar. At the same time, when a trigger signal is sent to the excitation ignition assembly, no opening signal is sent to the magnetic drive system; the arc extinguishing device includes an arc extinguishing fuse. It can be seen from Figure 17 that during the time period from t0 to t1, the contactor is in a normal state, and neither the excitation ignition assembly nor the piston operates. The busbar and the arc extinguishing fuse are conducting, and the drive coil is energized. At time t1, an overload or abnormal situation occurs, and the external control module or the internal control module sends a trigger signal to the excitation ignition assembly. The excitation ignition assembly is triggered, and the piston operates. During the time period from t1 to t2, the piston overcomes the initial position limit and moves to the busbar. At time t2, the busbar is disconnected by the piston. At this time, the arc extinguishing fuse and the contact system are conducting, and the drive coil is energized. During the time period from t2 to t3, the piston moves to the wire connecting the arc extinguishing fuse and the drive coil to the power supply. At time t3, the piston drives the fuse disconnecting assembly and the wire disconnecting assembly to disconnect the wire connecting the arc extinguishing fuse and the drive coil, and the drive coil is de-energized. During the time period from t3 to t4, the moving contact assembly and the static contact assembly change from the closed state to the open state. Thus, all the operations of the contactor are completed.

[0130] Refer to Figure 18 , which is another schematic diagram of the logic timing of the contactor. In this logic timing, the arc extinguishing device in the contactor does not include an arc extinguishing fuse, and it can be set as a metal wire mesh structure or an arc extinguishing grid structure. The external control module or the internal control module sends an opening signal to the control power supply of the magnetic drive system while sending a trigger signal to the excitation ignition assembly. No piston is provided for the corresponding moving contact assembly.

[0131] It can be seen from Figure 18It can be seen that at time t1, when an overload or abnormal situation occurs, the external control module or the internal control module sends a trigger signal to the excitation ignition component and also sends a trip signal to the magnetic drive system. When the excitation ignition component triggers the release of the driving force, the driving coil is de-energized; the piston moves, and during the period from t1 to t2, the piston overcomes the initial position limit and moves to the conductive row. At the same time, the moving contact assembly gradually breaks away from the conductive contact with the static contact assembly under the action of the elastic force. Since the piston response speed is much greater than the response speed of the spring elastic force of the moving contact assembly, at time t2, when the conductive row is disconnected by the piston, the contact system is still in the closed and conductive state, and during the period from t2 to t3, the moving contact assembly and the static contact assembly change from the closed state to the open state. At this point, all the actions of the contactor are completed.

[0132] In the above embodiments, when the pistons provided in the contactor are independently provided, one piston can only correspond to one conductive row or corresponding moving contact, and the piston has at least one impact end, and the impact end of the piston is used to cut off the corresponding conductive row or push the corresponding moving contact to move. When two or more pistons are combined into a composite piston, the composite piston has at least the same number of impact ends as the pistons, and each impact end is equivalent to an independently provided piston.

[0133] In the present invention, when there are multiple pistons, a single excitation ignition assembly is used to trigger the drive, and the multiple pistons can be connected to the cavity where the driving force release end of the excitation ignition assembly is located through the air channel. The volume of the high-pressure gas delivered to each piston through the air channel can be controlled by adjusting the length and cross-sectional area of ​​the air channel corresponding to each piston, thereby realizing the adjustment of the driving force, realizing the displacement time of the pistons corresponding to the conductive row and the moving contact, and realizing the disconnection sequence of the conductive row and the moving contact.

Claims

1. A disconnect integrated contactor, comprising a magnetic drive system and a contact system. The contact system includes a moving contact assembly and two stationary contact assemblies. The stationary contact assembly includes a stationary contact. In the normal operating state, the magnetic drive system drives the moving contact assembly and the stationary contact assembly to open and close. It is characterized in that, It further includes: An excitation ignition component and a piston, wherein: Each of the static contact components respectively includes a static contact and a conductive bar electrically connected to the static contact. The other ends of the conductive bars corresponding to the two static contacts respectively serve as the connection ends of the breaking integrated contactor. Or, one of the static contact components includes a static contact and a conductive bar electrically connected thereto, and the other static contact component includes a static contact and a terminal electrically connected to the static contact. The other ends of the conductive bar and the terminal respectively serve as the connection ends of the breaking integrated contactor; At least one piston is correspondingly arranged at the conductive bar of the static contact component; When the excitation ignition component acts according to the received trigger signal and releases the driving force, the driving force drives the piston to displace, and the impact end of the piston cuts off the corresponding conductive bar, disconnecting the conductive loop conducted after the moving contact component and the static contact component are in conductive contact.

2. The sectionalized integrated contactor according to claim 1, wherein, When there are more than two pistons: One piston is respectively arranged corresponding to the conductive bar of each static contact. When the driving force drives the piston to displace, the conductive bars corresponding to the pistons are disconnected successively or simultaneously; Or, one piston is respectively arranged corresponding to the moving contact component and the conductive bar of at least one static contact. When the driving force drives the piston to displace, first disconnect the conductive bar corresponding to the piston, and then push the moving contact component corresponding to the piston to displace and separate from the static contact component; Or, while disconnecting the conductive bar corresponding to the piston, push the moving contact component to displace and separate from the static contact component.

3. The segmented integrated contactor according to claim 2, wherein When one piston is arranged corresponding to the moving contact component, the distance between the piston corresponding to the conductive bar and the conductive bar is less than the distance between the piston corresponding to the moving contact component and the moving contact component, so that after the conductive bar is disconnected first, the moving contact component and the static contact component are separated.

4. The sectional integrated contactor according to claim 2, characterized in that, When one piston is arranged corresponding to the moving contact component, on the current-carrying path for applying the driving force to the piston arranged corresponding to the moving contact component, a gas deflector for reducing the gas flow rate is arranged. The gas deflector makes the driving force applied to the piston arranged corresponding to the moving contact component increase gradually, so that the piston arranged corresponding to the conductive bar acts first, and the piston arranged corresponding to the moving contact component acts later.

5. The sectional integrated contactor according to claim 4, characterized in that, When one piston is arranged corresponding to the moving contact component, on the current-carrying path for applying the driving force to the piston arranged corresponding to the moving contact component, a gas deflector for reducing the gas flow rate is arranged, and a spring is arranged on the piston corresponding to the moving contact component. The gas deflector makes the driving force applied to the piston arranged corresponding to the moving contact component increase gradually, and the elastic force of the spring can offset a part of the driving force applied to the piston arranged corresponding to the moving contact component, so that the piston arranged corresponding to the conductive bar acts first, and the piston arranged corresponding to the moving contact component acts later.

6. The segmented integrated contactor according to claim 2, wherein, When there is one piston arranged corresponding to the moving contact assembly, a spring is arranged on the piston corresponding to the moving contact assembly, and the elastic force of the spring can offset a part of the driving force applied to the piston arranged corresponding to the moving contact assembly, so that the piston arranged corresponding to the conductive bar acts first, and the piston arranged corresponding to the moving contact assembly acts later.

7. The segmented integrated contactor according to claim 2, wherein When there are two or more pistons, each piston is combined to form a composite piston with an integral structure. The number of impact ends on the composite piston is at least the same as the number of pistons, and the impact ends on the composite piston are in the same direction as the pistons; each conductive bar of each static contact is respectively arranged corresponding to the impact end of a composite piston. When the composite piston is displaced, the conductive bars corresponding to the impact ends of the composite piston are disconnected successively or simultaneously; or, the moving contact assembly and the conductive bars of at least one static contact are respectively arranged corresponding to the impact end of a composite piston; when the composite piston is displaced, the impact end first disconnects the conductive bar corresponding to it, and then pushes the moving contact assembly corresponding to it to be displaced and separated from the static contact assembly. Or, when the impact end disconnects the conductive bar corresponding to the impact end of the composite piston, it pushes the moving contact assembly to be displaced and separated from the static contact assembly at the same time.

8. The sectionalized integrated contactor according to any one of claims 1 to 7, characterized in that, An arc extinguishing device is also arranged at the conductive bar of the static contact assembly provided with the piston, and the arc extinguishing device is used for auxiliary arc extinguishing after the piston disconnects the conductive bar.

9. The segmented integrated contactor according to claim 8, characterized in that, The arc extinguishing device is one of the following structural forms or a combination of multiple structural forms: The arc extinguishing device includes an arc extinguishing chamber and an arc extinguishing melt. The arc extinguishing chamber is filled with an arc extinguishing medium; after passing through the arc extinguishing chamber, the arc extinguishing melt is connected in parallel at both ends of the corresponding conductive bar disconnected by the piston; or, the arc extinguishing device is a metal wire mesh structure, and the metal wire mesh structure is located on the outer periphery of the piston displacement path after the conductive bar is disconnected; or the arc extinguishing device is an arc extinguishing grid structure, and the arc extinguishing grid structure is located on the outer periphery of the piston displacement path after the conductive bar is disconnected; or, the arc extinguishing device includes a metal wire mesh structure and an arc extinguishing melt. After passing through the metal wire mesh structure, the arc extinguishing melt is connected in parallel at both ends of the corresponding conductive bar disconnected by the piston; When the arc extinguishing device includes an arc extinguishing melt, after the piston cuts off the conductive bar, the arc extinguishing melt connected in parallel on the conductive bar is cut off.

10. The segmented integrated contactor according to any one of claims 1 to 7, characterized in that, When the magnetic force driving system is an electromagnetic driving system, the wire connecting the driving coil of the electromagnetic driving system to the power supply can be disconnected by at least one piston.

11. The segmented integrated contactor according to any one of claims 1 to 7, characterized in that, The contact system, the excitation ignition device, the piston, and the arc extinguishing device are arranged in a sealed chamber structure inside the housing of the breaking integrated contactor, and the sealed chamber structure is filled with a gas arc extinguishing medium.

12. The segmented integrated contactor according to claim 11, wherein, The sealed chamber structure is separated into two mutually insulated chambers by a partition. The moving contact assembly and the static contact are located in the same chamber, and the arc extinguishing device, the excitation ignition assembly, the piston, and the conductive bar disconnection position are located in the same chamber.

13. The segmented integrated contactor according to any one of claims 1 to 7, characterized in that, When the piston moves to the end position, its position is locked.

14. The segmented integrated contactor according to claim 13, wherein When the piston moves to the end position, its position locking can be achieved by the interference fit or the hook structure between the piston and the end position.

15. The segmented integrated contactor according to any one of claims 1 to 7, characterized in that, When the trigger signal received by the excitation ignition component, the magnetic drive system receives a trip signal, driving the moving contact component to disengage from the static contact component for electrical conduction.

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