Active and passive integrated protection recoverable excitation integrated contactor

Abstract

The utility model relates to a recoverable excitation integrated contactor with active and passive integrated protection, which comprises a driving system, a contact system, an excitation ignition assembly, a magnetic tripping device, a microswitch, a first piston, a second piston, a melt cutting push rod, an auxiliary contact system and an arc extinguishing melt, the drive coil loop is connected with a trigger loop of the excitation ignition assembly in parallel and connected with a normally-closed contact and a normally-open contact of the microswitch in series, the state change of the drive coil loop and the trigger loop is controlled through a magnetic tripping device linked with the microswitch, and a trigger signal is provided for the excitation ignition assembly. The first piston is driven to enable the auxiliary contact system to be conducted so that the arc extinguishing melt can be connected to the main loop in parallel, the second piston is driven to drive the elastic piece to move so that the contact system can be forcibly opened, and then the first piston drives the melt cutting-off push rod to disconnect the arc extinguishing melt. Through excitation integration, the breaking capacity of the contactor is improved, and the current matching difficulty with the fuse is reduced; and after the protection action, the normal switching-on and switching-off functions of the contactor are maintained.

Description

Technical Field

[0001] The invention relates to the field of circuit protection, in particular to a contactor, in particular to a recoverable excitation integrated contactor with active and passive integrated protection. Background Art

[0002] At present, the protection measures for DC circuit systems (especially wind power, photovoltaics, energy storage and electric vehicles, etc.) are fuses plus contactors. The contactors are mainly responsible for connecting and disconnecting the rated load and the current below. However, due to the limited protection range of the fuse, it cannot be well matched with the contactor to form a reliable full-range fault current protection, which is easy to form contact welding and explosion in the protection circuit. In addition, since the fuse is a thermal melt protection, in the circuit where the fuse and the contactor are matched for protection, the two are installed in series, and the temperature rise and power consumption are very large.

[0003] Chinese patent application 202210250275.5 discloses a fuse integrated contactor, in which an explosive pack, an igniter, and a piston are integrated. The igniter ignites the explosive pack to react chemically to release high-pressure gas as a driving force, driving the piston to move, forcing the moving contact and the static contact to be out of contact after closing. After the contactor is closed, the coil is always energized to provide the moving contact with a continuous magnetic field force toward the static contact to maintain the closed state. When the driving force drives the piston to move and the moving and static contacts after closing are forced to separate, the magnetic field force provided by the coil must be overcome before the moving and static contacts can be out of conductive contact. The defects are: in the case of high current, forcing the moving contact to separate will generate a large arc between the moving and static contacts. The presence of a large arc may cause the circuit to be disconnected incompletely and unreliably, and at the same time cause ablation of the device, causing safety hazards. Summary of the invention

[0004] In order to solve the problems existing in the prior art, the present invention provides an excitation integrated contactor, in which at least one group of fuse branches with normally open breaks are installed in parallel on the contactor terminals connected to the main circuit, and the fuse is fixed in quartz sand. The excitation integrated contactor can realize the functions of a traditional contactor in the normal current separation and combination process, and can quickly close the fuse branches with parallel normally open breaks connected in parallel on the contactor terminals through the ignition action of the excitation actuator when overload and short circuit occur, and quickly open the opening distance between the moving and static contacts of the contactor to a larger position to avoid welding and explosion of the contactor contacts, and transfer the faulty large current in the main circuit to the parallel fuse branch, so that the large current extinguishes the arc in the quartz sand, greatly improving the short-circuit breaking capacity of the contactor. Since the fuse is not connected to the live circuit under normal current, the temperature rise and power consumption are very low; when the overload or short circuit fault is evacuated, the opening distance of the contactor is restored to the initial position to prepare for the next circuit separation and combination.

[0005] To achieve the purpose of the present invention, a technical solution is provided, which is a recoverable excitation integrated contactor with active and passive integrated protection, comprising a drive system and a contact system respectively located in different chambers, wherein the contact system comprises a moving contact and two stationary contacts, and the drive system drives the contact system to realize the opening and closing functions of the recoverable excitation integrated contactor with active and passive integrated protection;

[0006] An excitation ignition assembly, a first piston, an auxiliary contact system, a melt-cut push rod and an arc-extinguishing melt are sequentially arranged outside the chamber where the contact system and the drive system are located; the auxiliary contact system and the melt-cut push rod are respectively located on the displacement path of the first piston, and the melt is located on the displacement path of the melt-cut push rod; a second piston is arranged corresponding to the moving contact, which can force the moving contact and the static contact to be separated, and the second piston is connected with the chamber where one end of the high-pressure gas release of the excitation ignition assembly is located through an air flow channel. In the initial position, the first piston closes the air flow channel; the second piston is inserted into an elastic member, one end of the elastic member is fixed, and the other end is a free end suspended, and the second piston is fixedly connected to the free end of the elastic member, and when the high-pressure gas passing through the air flow channel drives the second piston to displace, the second piston can drive the elastic member to undergo elastic deformation;

[0007] One end of the arc-extinguishing fuse is conductively connected to one of the static contacts, and the other end is connected to the other static contact through the auxiliary contact system; in the initial position, the auxiliary contact system retains an insulating break, so that there is no conduction between the arc-extinguishing fuse and the static contact; the arc-extinguishing fuse is inserted in the arc-extinguishing medium;

[0008] The driving coil circuit of the driving system is connected in parallel with the trigger circuit of the excitation ignition component, and the driving coil circuit and the trigger circuit are respectively connected in series with the normally closed contact and the normally open contact of the micro switch;

[0009] It also includes a magnetic tripping device, which is linked with the micro switch to drive the micro switch to change the state of the drive coil circuit and the trigger circuit;

[0010] When an overload or short-circuit current occurs, the magnetic tripping device is actuated, causing the micro switch to change its switch state in a linked manner, the normally closed contact of the drive coil circuit becomes normally open, the circuit where the drive coil is located is disconnected, the drive coil is powered off, and the normally open contact of the trigger circuit becomes normally closed, causing the trigger circuit of the excitation ignition component to be turned on, and a trigger signal is sent to the excitation ignition component;

[0011] The excitation ignition component releases high-pressure gas according to the trigger signal, drives the first piston to displace so that the insulating break of the auxiliary contact system is turned on, and the fuse is connected in parallel in the main circuit where the static contact is located; as the first piston displaces, the air flow channel opens, and the high-pressure gas drives the second piston to displace through the air flow channel, forcing the moving contact and the static contact to be opened; the first piston continues to displace, drives the fuse-cutting push rod to displace, and disconnects the arc-extinguishing fuse. When the pressure of the high-pressure gas decreases, the elastic member drives the second piston to return to a normal open position.

[0012] Preferably, the magnetic tripping device comprises: a moving magnet, a static magnet, and a tension spring; the static magnet is arranged around one of the static contacts, the moving magnet is rotatably arranged on the outside of the static magnet, and an air gap is retained between the moving magnet and the static magnet, and a tension spring is arranged on the moving magnet to restore the moving magnet to its initial position; the moving magnet is linked to the micro switch; the magnetic tripping device and the micro switch are respectively located on the outside of the contact system and the chamber where the excitation ignition component is located.

[0013] Preferably, the moving magnet is hingedly arranged on the outside of the static magnet, and an L-shaped lever is arranged on the moving magnet, and the L-shaped lever is linked with the contact of the micro switch; when the static magnet absorbs the moving magnet and rotates, the L-shaped lever is driven to move, and the L-shaped lever drives the micro switch contact to move to change the switching state of the micro switch.

[0014] Preferably, a first conductor is fixedly provided on the impact end face of the first piston, the auxiliary contact system comprises a second conductor and a third conductor which are relatively spaced and insulated, the insulating break is formed between opposite ends of the first conductor and the third conductor, the ends of the second conductor and the third conductor which are away from each other are respectively conductively connected to the arc-extinguishing fuse and the static contact; the melt-cutting push rod is located at the insulating break; when the first piston displaces with the first conductor, the first conductor enters the insulating break, so that the second conductor and the third conductor are conductively connected, so that the arc-extinguishing fuse is connected in parallel to the main circuit, and at the same time, the first conductor drives the melt-cutting push rod to displace.

[0015] Preferably, the chamber where the arc-extinguishing melt is located is separated from the chamber where the first piston and the excitation ignition assembly are located by a middle partition, and a displacement channel is provided in the middle partition and the chamber where the arc-extinguishing melt is located; the melt-cutting push rod is integrally formed on the middle partition, and the connection between the melt-switching push rod and the middle partition is a disconnection weak point; an annular boss is provided on the outer peripheral side of the connection between the middle partition and the melt-cutting push rod in the direction of the first piston, and one end of the melt-cutting push rod is located in the displacement channel; the arc-extinguishing melt passes through the displacement channel and is located on the displacement path of the melt-cutting push rod; the free ends of the second conductor and the third conductor are placed on the annular bosses on the opposite sides of the melt-cutting push rod, and are bent into the bosses to form the insulating fracture.

[0016] Preferably, the elastic member is a bellows, one end of which is fixed to the outside of the chamber where the contact system is located, and the other end is a free end, one end of the airflow channel is located in the bellows, the second piston is inserted into the airflow channel in the bellows, and one end of the second piston is fixedly connected to the free end of the bellows; a contact push rod is fixed on the impact end of the second piston, and an open trumpet-shaped groove is provided on the end face of the contact push rod facing the moving contact.

[0017] Preferably, an arc isolation plate is provided in the chamber where the contact system is located, and a limiting structure is provided on the arc isolation plate for limiting the forced displacement of the moving contact; when the second piston forces the moving contact and the static contact to form a large-break opening, the limiting structure limits the moving contact.

[0018] Preferably, the chamber where the drive system and the contact system are located is separated by a sealing partition, and a sealing cover plate is arranged on the sealing partition to form a sealed chamber where the contact system is located; an excitation shell is arranged on one side of the chamber where the drive system and the contact system are located, and the excitation ignition component, the first piston, the auxiliary contact system, the melt-cutting push rod, and the arc-extinguishing melt are arranged in the excitation shell; the excitation shell part where the excitation ignition component and the first piston are located is a convex structure; a shell is arranged in the chamber where the drive system and the contact system are located and outside the excitation shell; one end of the static contact passes through the sealing cover plate and the shell and is located outside the shell, and the excitation ignition component passes through the excitation shell and the shell and is located outside the shell; the static magnet is located at the static contact between the shell and the sealing cover plate, the dynamic magnet is hinged on the outside of the excitation shell, one end of the tension spring and the micro switch are respectively located on the outside of the convex structure part of the excitation shell.

[0019] Preferably, a reaction spring is arranged on the outside of the melt-cutting push rod; a compression cross bar is arranged on the outside of the impact end of the first piston, and the compression cross bar extends beyond the upper end surface of the reaction spring to extend out of the chamber where the excitation ignition component is located and is located on the contact side of the microswitch contact; a disconnection weak point is arranged on the compression cross bar; when the first piston is displaced, the compression cross bar is driven to displace, compressing the reaction spring and squeezing the contact of the microswitch so that the microswitch always maintains the state after the switch state is changed; when the first displacement reaches the terminal position, the compression cross bar is disconnected from the disconnection weak point, and the reaction spring drives the compression cross bar to return to the initial position, and loses the squeezing of the contact of the microswitch.

[0020] Preferably, a guide rod is provided on the compression cross rod, and the guide rod is inserted into the free end of the reaction spring.

[0021] Preferably, the annular boss on the outer side of the melt-cutting push rod is arranged corresponding to the disconnection weak point of the pressing cross bar.

[0022] Preferably, the excitation ignition component also retains a connection node communicating with an external trigger circuit.

[0023] Through the excitation integration technology, the overload breaking capacity of the contactor can be improved and the difficulty of current matching with the fuse can be reduced; and when the excitation ignition component is actuated, the contact system and drive system of the contactor will not be damaged, and the normal opening and closing functions of the contactor will be maintained. The user can choose whether to perform maintenance and replacement according to their own protection strategy. When maintenance and replacement are not performed, the integrated excitation contactor that has been actuated can continue to realize the opening and closing functions of the contactor, thereby reducing the maintenance cost on the user side.

[0024] By arranging the magnetic tripping device outside the contactor and the excitation housing, and the excitation housing adopting a convex structure, interference with the normal operation of the contactor and the excitation ignition component can be avoided, and space can be saved.

[0025] By setting the reaction spring and the compression crossbar, the recovery speed of the excitation integrated contactor can be accelerated after the first action, so that the micro switch returns to its original position, the drive coil circuit is turned on again, and the trigger circuit is disconnected. By setting the bellows, after the second piston is displaced, the second piston can return to its initial position under the elastic force of the bellows, and the moving contact can return to its initial position when the gate is normally opened under the action of the driving reaction spring, so that the contactor as a whole returns to the state when the gate is normally opened. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a circuit principle diagram of the present invention.

[0027] Figure 2It is a schematic diagram of the three-dimensional appearance structure.

[0028] Figure 3 yes Figure 2 Schematic diagram of the front view structure.

[0029] Figure 4 Schematic diagram of the three-dimensional structure of Example 1 after removing the outer shell.

[0030] Figure 5 Example 1 Figure 4 Schematic diagram of the AA section structure.

[0031] Figure 6 yes Figure 5 Schematic diagram of the MM cross-section structure.

[0032] Figure 7 yes Figure 5 Schematic diagram of the KK cross-section structure.

[0033] Figure 8 It is a schematic diagram of the three-dimensional structure of Example 2 after removing the outer shell.

[0034] Fig. 9 Example 2 Figure 8 A schematic diagram of the cross-sectional structure of the center line of the excitation ignition component where the center line connecting the two static contacts is located is vertical.

[0035] Fig.10 yes Fig. 9 Schematic diagram of the JJ cross-section structure.

[0036] Fig.11 yes Fig. 9 Schematic diagram of the BB cross-section structure.

[0037] Reference numerals:

[0038] Static contact 1, moving contact 2, moving guide rod 3, arc isolation plate 4, static iron core 5, moving iron core 6, gas channel 7, static iron core 8, bellows 9, second piston 10, contact push rod 11, arc isolation plate 12, contact spring 13, drive coil 14, housing 15, excitation ignition component 16, excitation upper cover 17, first piston 18, first conductor 19, middle partition 20, arc extinguishing melt 21,

[0039] Arc extinguishing medium 22, lower shell 23, tension spring 24, magnetic suction door 25, L-shaped lever 251, micro switch 26, contact piece 261 of micro switch, melt cut-off push rod 27, second conductor 28, third conductor 29, sealing cover plate 31, reaction spring 32, compression cross bar 33, magnetic tripping device 35, drive coil circuit 36, trigger circuit 37, external trigger circuit 38. DETAILED DESCRIPTION

[0040] The active and passive integrated protection recoverable excitation integrated contactor of the present invention comprises a drive system and a contact system respectively located in different chambers, the contact system comprises a moving contact and two stationary contacts, and the drive system drives the contact system to realize the opening and closing functions of the contactor;

[0041] An excitation ignition assembly, a first piston, an auxiliary contact system, a melt-cut push rod and an arc-extinguishing melt are sequentially arranged in a chamber on one side of the chamber where the contact system and the drive system are located; the auxiliary contact system and the melt-cut push rod are respectively located on the displacement path of the first piston, and the melt is located on the displacement path of the melt-cut push rod; a second piston is arranged corresponding to the moving contact, which can force the moving contact and the static contact to be separated, and the second piston is fixedly arranged on an elastic member that can be extended and retracted along the displacement direction of the second piston. The second piston is connected to the chamber where the high-pressure gas release end of the excitation ignition assembly is located through an airflow channel. When in the initial position, the first piston closes the airflow channel;

[0042] One end of the arc-extinguishing melt is conductively connected to one of the particle-size contacts, and the other end is conductively connected to another static contact through an auxiliary contact system. In the initial position, the auxiliary contact system retains an insulating break, so that there is no conduction between the arc-extinguishing melt and the static contact; the arc-extinguishing melt is arranged in the arc-extinguishing medium;

[0043] The driving coil circuit of the driving system is connected in parallel with the trigger circuit of the excitation ignition component, the normally closed contact of the micro switch is connected in series to the driving coil circuit, and the normally open contact of the micro switch is connected in series to the trigger circuit; the excitation ignition component also retains a connection node connected to the external trigger circuit;

[0044] The magnetic tripping device comprises a moving magnet, a static magnet and a tension spring; the static magnet is arranged around one of the static contacts, the moving magnet is rotatably arranged outside the static magnet, and an air gap is reserved between the moving magnet and the static magnet, and a tension spring is arranged on the moving magnet to restore the moving magnet to an initial position; the moving magnet is linked to a micro switch; the magnetic tripping device and the micro switch are respectively located outside the contact system and the chamber where the excitation ignition component is located;

[0045] When overload or short circuit current occurs, the static magnet absorbs and fixes the dynamic magnet. During the displacement of the dynamic magnet, the micro switch changes the switch state, the normally closed contact of the drive coil circuit becomes normally open, and the normally open contact of the trigger circuit becomes normally closed, sending a trigger signal to the excitation ignition component;

[0046] The ignition component is stimulated to move, driving the first piston to displace so that the insulating break of the auxiliary contact system is turned on, and the fuse is connected in parallel in the main circuit where the static contact is located; as the first piston moves, the air flow channel opens, and the high-pressure gas drives the second piston to move through the air flow channel, forcing the moving contact and the static contact to form a large break and open the gate; the first piston continues to move, driving the fuse-cutting push rod to move, disconnecting the arc-extinguishing fuse.

[0047] See also Figure 1 Combined with Figure 3 First, the switching circuit of the magnetic tripping device and the micro switch of the above technical solution and the principle of sending the trigger signal are explained:

[0048] A static conductive magnet 8 of a magnetic tripping device 35 is arranged on one of the static contacts 1 of the contactor, and a dynamic conductive magnet on the magnetic suction door 25 of the magnetic tripping device 35 is linked with a micro switch contact piece 261 of the micro switch 26 .

[0049] The NC point (normally closed point) of the micro switch 26 is connected in series to the contactor drive coil circuit 36, and the NO point (normally open point) is connected in series to the trigger circuit 37 of the excitation ignition component 16. The trigger circuit of the excitation ignition component 16 is connected in parallel with the contactor coil circuit.

[0050] Under normal load conditions, the contactor coil circuit is closed to provide power to the drive coil, and the contactor works normally to open and close the switch to realize the on and off of the electrical circuit. The trigger circuit of the excitation ignition component 16 is disconnected, and the excitation ignition component 16 does not operate.

[0051] The excitation ignition component 16 has a separate spare node, which can be connected to the external trigger circuit 38 controlled by the client's control system to receive the trigger signal sent actively. The static conductive magnet 8 installed on the static contact 1 and the dynamic conductive magnet on the magnetic suction door 25 set on the excitation upper cover 17 form a magnetic tripping device 35.

[0052] When a large current of a certain threshold is generated in the main circuit, the static magnet 8 will generate an induced magnetic field, and the static magnet 8 absorbs and displaces the moving magnet and fixes it. During the displacement of the moving magnet, the contact piece 261 of the microswitch 26 is toggled to change the state of the microswitch 26, so that the normally closed point of the contactor coil circuit is opened, and the contactor coil is de-energized. At the same time, the normally open point in the trigger circuit of the excitation ignition component 16 connected in series is closed, so that the trigger circuit of the excitation ignition component 16 is closed, and the trigger circuit of the excitation ignition component 16 is powered by the contactor coil power supply to trigger the excitation ignition component 16, driving the first piston 18 to connect the arc extinguishing fuse 21 to the main circuit of the contactor that has not been disconnected. At the same time, the second piston 10 is displaced to disengage the moving contact 2 from the static contact 1 and form a large-break opening; the first piston continues to displace, driving the melt-cutting push rod to disconnect the arc extinguishing fuse 21.

[0053] The following is a detailed description of the preferred embodiments. The description of the direction position in the text is based on the direction shown in the drawings and does not constitute a limitation on the technical solution.

[0054] Example 1

[0055] See also Figures 2 to 7 The excitation integrated contactor of the present invention comprises a housing 15, a contactor structure is arranged in the housing 15, and a magnetic tripping device, an excitation ignition assembly, a first piston, an auxiliary contact system, a melt, a push rod, a second piston, and an elastic member are integrated outside the contactor structure. Two terminals 1 are spaced apart at the top of the housing, and an electronic ignition device 16 is arranged on the center line of the line connecting the two terminals 1.

[0056] The contactor comprises a contact system and a drive module. The contact system and the drive system are respectively located in different housing cavities. The contact system is located above the drive system. The housings where the contact system and the drive system are located are separated by a partition.

[0057] The driving system includes a driving coil 14, a moving guide rod 3, a static iron core 5, a moving iron core 6, and a magnetic ring. The driving coil 14 is wound on the coil frame, the moving guide rod 3 is fixed on the moving iron core 6, and the magnetic ring displaces the outer periphery of the driving coil. A reaction spring is sleeved on the moving guide rod 3 between the static iron core and the moving iron core, and the reaction spring is always in a compressed state. The static iron core 5 is located between the driving coil 14 and the partition.

[0058] A sealing cover plate 31 is arranged on the partition, so that the cavity where the contact system is located forms a sealed cavity, and a gas arc extinguishing medium, such as an inert gas, such as nitrogen, can be filled in the cavity. The contact system includes two static contacts 1 and a moving contact 2. The static contact 1 is arranged on the top of the sealing cover plate 31 at intervals, one end of which passes through the sealing cover plate 31 and is located in the sealed cavity formed by the sealing cover plate 31 and the partition, and the other end of which passes through the shell and is located outside the shell, and can be connected to an external circuit. One end of the moving guide rod 3 passes through the partition and is located in the cavity where the moving contact 2 is located. The moving contact 2 is arranged on the moving guide rod 3 and supported by the contact spring 13. Under normal circumstances, the driving coil is energized, the static iron core 5 absorbs the moving iron core 6 to drive the moving guide rod 3 to drive the moving contact 2 to move, the moving contact 2 and the static contact 1 are in conductive contact, and the contactor is normally closed. When the driving coil is de-energized, under the action of the reaction spring 30, the contact spring 13, and the gravity of the moving contact 2, the moving contact 2 and the static contact 1 are separated from the conductive contact, and the contactor is opened. Arc isolation plates (4, 12) are respectively arranged on the sealing partition and on the opposite sides of the moving contact 2. The arc isolation plates are provided with limiting grooves for limiting the displacement of the moving contact to form a limiting structure. When the moving contact and the static contact form a large-break opening, the limiting structure limits the displacement position of the moving contact to protect the contact spring 13.

[0059] In the present invention, the contact system and the drive system of the contactor can adopt a conventional contactor structure, and under normal circumstances, the normal working state of the contactor is realized. Therefore, in the present invention, if there are any unfinished matters in the description of the contact system and the drive system of the contactor, please refer to the prior art of the contactor.

[0060] A boss protruding from the top is provided on the top outer surface of the sealing cover plate 31 between the two static contacts 1, and a through hole penetrating the sealing cover plate 31 is provided on the boss, and the through hole is provided corresponding to the moving contact. The elastic member 9 is inserted into the through hole of the sealing cover plate 31 and is arranged in contact with the inner wall of the through hole. One end of the elastic member 9 extends out of the through hole of the sealing cover plate 31 to form a free end. The free end of the elastic member 9 is located in the sealed cavity formed by the sealing cover plate and the sealing partition. The other end of the elastic member 9 is located on the top outer surface of the sealing cover plate 31, and the other end is flanged to form a limiting edge, which is fixedly arranged on the outer surface of the sealing cover plate 31 at the periphery of the through hole of the sealing cover plate 31 to form a position limit for the elastic member 9. An airflow channel 7 is provided on the top outer surface of the sealing cover plate 31. The airflow channel 7 is a separately made part, which is in an inverted L shape as a whole, and is a tubular structure with two ends open. One end of the airflow channel 7 is inserted into the elastic member 9 from the top outer surface of the sealing cover plate 31, and the elastic member 9 is pressed tightly into the through hole of the sealing cover plate 31. A support member is integrally formed on the outer periphery of the airflow channel 7, and the support member is located between the sealing cover plate and the housing to support the airflow channel 7. A second piston 10 is provided in the airflow channel 7 in the through hole of the sealing cover plate 31, and the second piston 10 closes the end of the airflow channel 7, and the second piston 10 is welded to the free end of the elastic member 9. When high-pressure gas passes through the airflow channel 7, the high-pressure gas can drive the second piston 10 to drive the elastic member 9 to expand and contract in the sealed cavity formed by the sealing cover plate and the sealing partition.

[0061] A contact push rod 11 is fixedly arranged on the second piston 10, and the contact push rod 11 is arranged corresponding to the moving contact 2. The contact push rod 11 is made of insulating material, and its longitudinal section is in the shape of an open trumpet-shaped structure, that is, a trumpet-shaped groove is arranged on the end surface facing the moving contact 2. When the moving contact 2 moves for normal opening and closing, the contact push rod 11 will not affect the movement of the moving contact 2.

[0062] A lower housing 23 and an excitation cover 17 are respectively arranged on one side of the cavity where the contact system and the drive system are located, and the excitation cover 17 and the lower housing 23 form an excitation housing. The excitation cover 17 has a convex structure, and the excitation cover 17 is arranged on the lower housing 23 and connected to the lower housing 23 by screws. A middle partition 20 is arranged between the lower housing 23 and the excitation cover 17, which separates the lower housing and the cover into two independent sealed cavities.

[0063] A static magnet 8 is arranged around the periphery of one of the static contacts 1 between the sealing cover plate 31 and the outer shell 15. The static magnet 8 is arranged in a U-shape or a C-shape to semi-surround the static contact 1, and its open end faces the side where the excitation cover is located. A magnetic shielding layer is arranged on the periphery of the static magnet 8 except for the open end to prevent the magnetic field from affecting other components and actions. A magnetic door 25 is arranged at the open end of the static magnet 8, and one side of the magnetic door 25 is hinged at the outer position of the excitation cover 17 adjacent to the sealing cover. A dynamic magnet is arranged on the end face of the magnetic door 15 facing the static magnet 8. A tension spring 24 is arranged on the outer surface of the magnetic door 25, and the other end of the tension spring 24 is fixedly arranged on the outer side surface of the excitation cover 17. In the initial position, an air gap is reserved between the magnetic door 25 and the open end of the static magnet 8 to ensure that when the magnetic attraction force generated by the static magnet 8 is large enough, the magnetic door 25 can be adsorbed and rotated toward the static magnet 8, and the magnetic door 25 can be fixed on the static magnet 8. The static magnet, the dynamic magnet, the magnetic door and the tension spring form a magnetic tripping device.

[0064] The micro switch 26 is fixedly arranged on the outside of the excitation upper cover 17. The magnetic door 25 is provided with an L-shaped lever 251. One end of the L-shaped lever is located on the outside of the contact piece 261 of the micro switch 26, and forms a linkage with the contact piece 261. When the magnetic door 25 rotates toward the static conductive magnet 8, and the static conductive magnet 8 adsorbs and fixes the magnetic door 25, the L-shaped lever moves along with the magnetic door 25, and moves the contact piece 261 of the micro switch 26, changing the switch state of the micro switch 26, disconnecting the drive coil circuit, and connecting the trigger circuit, and then the drive coil power supply is used to supply power to the excitation ignition component 16, thereby increasing the trigger signal.

[0065] The excitation ignition assembly 16 and the first piston 18 are arranged in a sealed cavity formed by the excitation upper cover 17 and the middle partition plate 20 , and the melt 21 is located in a sealed cavity formed by the lower shell 23 and the middle partition plate 20 .

[0066] A communication channel protruding outward and having two ends connected is provided on one side of the excitation upper cover 17 corresponding to the airflow channel 7. One end of the communication channel is opened between the sealing cover plate 31 and the shell 15, and the other end is opened on the inner wall of the excitation upper cover 17. One end of the airflow channel 7 is sleeved in one end of the communication channel between the sealing cover plate and the shell, so that the airflow channel 7 is connected to the cavity where the high-pressure gas release end of the excitation ignition component 16 is located through the communication channel. The support member on the periphery of the airflow channel 17 is located outside the communication port.

[0067] The excitation upper cover 17 has a convex structure. The excitation ignition assembly 16 is a gas generating device that can release high-pressure gas according to the received trigger signal. The excitation ignition assembly 16 is arranged on the top of the excitation upper cover 17 and closes the top of the excitation upper cover 17. The excitation ignition assembly 16 is located on the same side of the two static contacts 1 and on the center line of the line connecting the two static contacts 1.

[0068] The first piston 18 disposed in the excitation upper cover 17 is in sealing contact with the excitation upper cover 18. In the initial position, the first piston 18 closes the opening of the communication channel on the side wall of the excitation upper cover 17, so that the airflow channel 7 is not connected to the cavity where the high-pressure gas release end of the excitation ignition component 16 is located. A groove is provided on the end face of the first piston 18 facing the excitation ignition component 16, and the high-pressure gas release end of the excitation ignition component 16 is located in the groove at the end face of the first piston 18. A first conductor 19 is fixedly provided on the end face of the first piston 18 facing the middle partition 20, and the first conductor 19 protrudes toward the middle partition 20.

[0069] A melt-cut push rod 27 protruding from the surface of the middle partition is integrally formed on the middle partition 20 corresponding to the first conductor 19, and an annular limiting boss protruding from the surface of the middle partition is respectively provided on both sides of the middle partition 20 on the outer peripheral side of the melt-cut push rod 27. The integral connection between the melt-cut push rod 27 and the middle partition 20 is a disconnection weak point, and its thickness is relatively thin. When impacted by the first conductor 19, it will be disconnected from the disconnection weak point and separated from the middle partition 20.

[0070] A supporting boss of an annular structure protruding from the bottom is provided on the bottom of the lower shell 23. The limiting boss of the middle partition 20 facing the lower shell 23 is supported on the supporting boss on the lower shell 23, and the contact surface forms a sealed contact. A displacement channel for the melt switching push rod 27 to move is formed in the limiting boss and the supporting boss of the middle partition 20. An arc extinguishing chamber is formed between the displacement channel and the lower shell 23, and the arc extinguishing chamber is filled with an arc extinguishing medium 22, which is quartz sand or other solid materials that can participate in arc extinguishing. The arc extinguishing melt 21 passes between the middle partition 20 and the lower shell 23, through the arc extinguishing medium and the displacement channel, one end of the arc extinguishing melt 21 is conductively connected to one of the static contacts 1, and the other end of the arc extinguishing melt 21 is conductively connected in series with another static contact through a conductive auxiliary contact system, forming an arc extinguishing melt 21 connected in parallel to the main circuit in which the moving contact and the static contact are conductive. The auxiliary contact system is similar to a switch structure. In the initial position, the auxiliary contact system is in a disconnected state, and the arc-extinguishing fuse 21 is not connected in parallel to the main circuit.

[0071] The auxiliary contact system includes a second conductor 28 and a third conductor 29 with insulating spacings facing each other, wherein the second conductor 28 is conductively connected to one end of the arc-extinguishing melt, and the third conductor 29 is conductively connected to the stationary contact 1. The free ends of the second conductor 28 and the third conductor 29 are respectively placed on the limiting bosses of the middle partition 20 facing the first piston, and are bent into the limiting bosses. The free ends of the second conductor 28 and the third conductor 29 are in a contact sheet structure, inclined close to the melt-cutting push rod 27, and located on the displacement path of the first conductor 19. When the first conductor 19 is displaced between the second conductor 28 and the third conductor 29, the free ends of the second conductor 28 and the third conductor 29 are in conductive contact with the first conductor 19 to conduct the arc-extinguishing melt and the stationary contact. Since the free ends are in a contact sheet structure, reliable conductive contact can be ensured under the action of elastic force.

[0072] The arrangement of the second conductor 28 and the third conductor 29 of the auxiliary contact system is not limited to the above structure, and can also be arranged in a manner of being staggered and insulated with an upper and lower spacing, and the first conductor drives the second conductor 28 and the third conductor 29 to overlap and contact at one end of the staggered position; in this case, the end of the melt-cut push rod facing the first piston can form a support for the staggered and overlapping end of the third conductor 29, and after the first piston drives the second conductor 28 and the third conductor 29 to conduct electricity, it continues to drive the overlapping end of the second conductor 28 and the third conductor 29 to displace, thereby pushing the melt-cut push rod to displace.

[0073] The working principle of this embodiment:

[0074] Under normal working conditions, the contactor works normally to realize the normal function of the contactor, that is, the driving coil is energized, the moving iron core drives the moving guide rod and the moving contact to move toward the static contact, the moving contact and the static contact are in conductive contact, the closing circuit is realized, and the main circuit where the moving contact and the static contact are located is turned on; when the driving coil is de-energized, under the action of the reaction spring, the contact spring and gravity, the moving iron core drives the moving guide rod and the moving contact to move toward the driving coil, realizing normal opening circuit.

[0075] When overload or short circuit current occurs, the magnetic attraction force generated on the static conductive magnet 8 is large enough to displace the magnetic attraction door 25 toward the static conductive magnet 8, and the L-shaped lever drives the contact of the micro switch 26 to change the switch state of the micro switch 26, disconnecting the drive coil circuit and connecting the trigger circuit, and sending a trigger signal to the excitation ignition component 16 through the drive coil power supply and the connected trigger circuit. The excitation ignition component 16 ignites according to the trigger signal, releases high-pressure gas as a driving force, drives the first piston 18 to drive the first conductor 19 to displace toward the direction of the melt cutting push rod 27, and the first conductor 19 drives the melt cutting push rod 27 to disconnect and displace from the middle partition 20, and the first conductor 19 is inserted between the second conductor 8 and the third conductor 29, so that the arc extinguishing fuse 21 is connected in parallel to the main circuit. When the first piston moves with the first conductor and the arc-extinguishing melt is connected in parallel to the main circuit, the first piston is displaced, exposing the connecting channel, so that the airflow channel 7 is connected with the chamber where the high-pressure gas release end of the excitation ignition component 16 is located, and the high-pressure gas drives the second piston 10 to move through the airflow, and the second piston 10 drives the bellows 9 to undergo reversible elastic deformation. The contact push rod 11 on the second piston 10 forces the moving contact 2 to break away from the conductive contact with the static contact 1, forcing the gate to open, and forming a large-distance opening break greater than the normal opening distance between the moving contact and the static contact, that is, a large-break opening; the moving contact 2 is displaced to the limiting groove at the arc isolation plate (4, 12) to limit and isolate the arc.

[0076] When the moving contact and the stationary contact are out of conductive contact, the first piston drives the first conductor to continue to push the fuse-cutting push rod 27 to continue to move along the displacement channel, breaking the arc-extinguishing fuse 21, and completely disconnecting the main circuit.

[0077] Since high temperature is generated when the ignition component is stimulated to release high-pressure gas, when the temperature of the high-temperature high-pressure gas decreases, the gas pressure of the high-pressure gas decreases accordingly, and when the driving force applied to the second piston is less than the bellows elastic force, the second piston can return to its initial position driven by the bellows elastic force, and the moving contact also returns to its original position under the action of the reaction spring, thereby restoring the normal opening and closing function of the contactor and realizing the normal function of the contactor.

[0078] If replacement is required, only the excitation part needs to be replaced to realize the full functions of the excitation integrated contactor. Customers can choose not to replace the contactor according to their usage preferences, so that the contactor can continue to perform normal opening and closing functions.

[0079] When an abnormal situation occurs (vehicle collision, environmental fire, etc.), the magnetic release device does not operate. At this time, the node connected to the client's external trigger circuit can actively send a trigger signal to the excitation ignition component through the trigger circuit, so that the excitation ignition component can be activated and the first piston can be driven to move.

[0080] By sending a trigger signal through the passive conduction of the trigger circuit or actively sending a trigger signal externally, active and passive triggering of the excitation ignition component can be achieved, thereby improving working reliability and expanding response scenarios (overload, short circuit, collision, fire, etc.).

[0081] Arc extinguishing principle:

[0082] Before the moving contact and the stationary contact are forced to open, the auxiliary contact system is turned on through the first piston, the first conductor and the auxiliary contact system, so that the arc-extinguishing fuse is connected in parallel to the main circuit; before the moving contact and the stationary contact are forced to open, since the resistance of the arc-extinguishing fuse is much greater than the resistance of the main circuit, the current almost all passes through the main circuit, and the current of the parallel fuse can be ignored;

[0083] Then the moving contact and the static contact are forced to open. During the forced opening, since the impedance between the moving contact and the static contact gradually increases to form an insulating state, its resistance gradually increases and is much greater than the resistance of the parallel fuse. Most of the current flowing through the static contact and the moving contact flows through the parallel fuse. At this time, the current in the main circuit is reduced to an extremely low level. Therefore, after the moving contact and the static contact are forced to open, the arc generated between the breaks after the opening is very small, and the arc can be easily extinguished by air or a gas-filled arc extinguishing medium, and no arc erosion of the moving contact and the static contact is caused. Since the resistance of the arc extinguishing fuse is very large, sufficient current limiting is achieved for the current flowing through the arc extinguishing fuse, so that the current is reduced. When the arc extinguishing fuse 21 is cut off, the arc generated at its break is relatively small, and the break and the arc are located in the arc extinguishing medium, and the arc extinguishing medium participates in the arc extinguishing, thereby improving the arc extinguishing capability.

[0084] The advantages of the technical solution of the present invention are:

[0085] When the contactor is in normal working condition, the arc extinguishing fuse is not connected in parallel to the main circuit, so as not to increase the impedance of the main circuit; only when abnormal conditions such as overload and short-circuit current occur, the arc extinguishing fuse is connected in parallel to the main circuit to participate in arc extinguishing. Since the arc extinguishing fuse is connected in parallel to the main circuit for a very short time, the overall power consumption of the excitation integrated contactor is relatively low.

[0086] The drive coil circuit and the trigger circuit are disconnected by the linkage of the micro switch and the magnetic release device. The drive coil power supply is used to provide a trigger signal for the excitation ignition component, and the power supply of the contactor itself is used to achieve triggering, making the structure simpler. When the main circuit is disconnected after the gate is opened, the magnetic suction door can be restored to its initial position under the action of the tension spring, and the contact of the micro switch is moved to restore the micro switch to its initial state.

[0087] The magnetic tripping device is arranged on the stationary contact, and the micro switch is located outside the excitation upper cover of the convex structure, so that the space is fully utilized and the volume of the contactor structure integrated with the excitation is smaller.

[0088] Furthermore, the micro switch for energizing the integrated contactor can be automatically restored.

[0089] Example 2

[0090] The appearance structure of Example 2 is the same as that of Example 1. The internal structure is specifically described as an example.

[0091] See also Figures 8 to 11 On the basis of the above technical solution, a reaction spring 32 and a compression cross bar 33 are added to the excitation integrated contactor. This is achieved by the following structure: a reaction spring 32 is arranged on the middle partition 20 in the excitation upper cover 17, and the elastic force direction of the reaction spring 32 is the same as the displacement direction of the first piston. The reaction spring 32 is located on one side of the limiting boss of the middle partition 20. A compression cross bar 33 is arranged on the outer side of the first piston 18, and the compression cross bar 33 passes through the top of the reaction spring 32 and the side wall of the excitation upper cover 17, and is located on one side of the contact piece 261 of the micro switch 26, and the compression cross bar 33 is located below the L-shaped lever. A guide rod is arranged below the compression cross bar 33, and the guide rod is arranged on the upper part of the hollow part of the reaction spring 32. A disconnection weak point is arranged at the side wall position of the compression cross bar 33 corresponding to the annular limiting boss of the middle partition 20. When the first piston 18 drives the compression cross bar 33 to move, the compression cross bar 33 compresses the reaction spring 32, and at the same time, the compression cross bar 33 squeezes the contact of the micro switch 26 and gradually moves downward. When the first piston drives the first conductor to drive the melt-cutting push rod to disconnect the melt, the first piston drives the compression cross bar to move to the limiting boss of the middle partition and makes the compression cross bar disconnect from the weak point under the action of the limiting boss and detach from the first piston. In this process, the compression cross bar makes the contact of the micro switch always in the NC point disconnected and NO point closed state. When the compression cross bar 33 is disconnected from the weak point, the compression cross bar 33 loses the pressure on the reaction spring 32. Under the elastic force of the reaction spring 32, the compression cross bar is lifted toward the excitation ignition component, and the contact of the micro switch loses the extrusion of the compression cross bar. At the same time, due to the power failure of the main circuit, the magnetic tripping device loses the magnetic field force. Under the action of the tension spring, the magnetic suction door opens and returns to the initial position, and the micro switch returns to the initial state, that is, the drive coil circuit is turned on and the trigger circuit is disconnected; the second piston returns to the initial position under the elastic force of the bellows, and the moving contact returns to the normal opening position under the elastic force of the reaction spring. The contactor structure as a whole returns to the normal opening state. The excitation part structure such as the excitation ignition component and the first piston loses the excitation effect. The client can choose whether to repair and replace the excitation integrated contactor according to his own wishes. When choosing to repair and replace, it only runs the normal function of the contactor, thereby reducing the client's use cost.

Claims

1. A recoverable excitation integrated contactor with active and passive integrated protection, characterized in that: It includes a drive system and a contact system respectively located in different chambers, the contact system includes a moving contact and two stationary contacts, and the drive system drives the contact system to realize the opening and closing function of the recoverable excitation integrated contactor of the active and passive integrated protection; An excitation ignition assembly, a first piston, an auxiliary contact system, a melt-cut push rod and an arc-extinguishing melt are sequentially arranged outside the chamber where the contact system and the drive system are located; the auxiliary contact system and the melt-cut push rod are respectively located on the displacement path of the first piston, and the melt is located on the displacement path of the melt-cut push rod; a second piston is arranged corresponding to the moving contact, which can force the moving contact and the static contact to be separated, and the second piston is connected with the chamber where one end of the high-pressure gas release of the excitation ignition assembly is located through an air flow channel. In the initial position, the first piston closes the air flow channel; the second piston is inserted into an elastic member, one end of the elastic member is fixed, and the other end is a free end suspended, and the second piston is fixedly connected to the free end of the elastic member, and when the high-pressure gas passing through the air flow channel drives the second piston to displace, the second piston can drive the elastic member to undergo elastic deformation; One end of the arc-extinguishing fuse is conductively connected to one of the static contacts, and the other end is connected to the other static contact through the auxiliary contact system; in the initial position, the auxiliary contact system retains an insulating break, so that there is no conduction between the arc-extinguishing fuse and the static contact; the arc-extinguishing fuse is inserted in the arc-extinguishing medium; The driving coil circuit of the driving system is connected in parallel with the trigger circuit of the excitation ignition component, and the driving coil circuit and the trigger circuit are respectively connected in series with the normally closed contact and the normally open contact of the micro switch; It also includes a magnetic tripping device, which is linked with the micro switch to drive the micro switch to change the state of the drive coil circuit and the trigger circuit; When an overload or short-circuit current occurs, the magnetic tripping device is actuated to cause the micro switch to change its switch state, the normally closed contact of the drive coil circuit becomes normally open, the drive coil circuit is disconnected, the drive coil is powered off, and the normally open contact of the trigger circuit becomes normally closed, causing the trigger circuit of the excitation ignition component to be turned on, and a trigger signal is sent to the excitation ignition component; The excitation ignition component releases high-pressure gas according to the trigger signal, drives the first piston to displace so that the insulating break of the auxiliary contact system is turned on, and the fuse is connected in parallel in the main circuit where the static contact is located; as the first piston displaces, the air flow channel opens, and the high-pressure gas drives the second piston to displace through the air flow channel, forcing the moving contact and the static contact to be opened; the first piston continues to displace, drives the fuse-cutting push rod to displace, and disconnects the arc-extinguishing fuse. When the pressure of the high-pressure gas decreases, the elastic member drives the second piston to return to a normal open position.

2. The recoverable excitation integrated contactor according to claim 1, characterized in that: The magnetic tripping device comprises: a moving magnet, a static magnet and a tension spring; the static magnet is arranged around one of the static contacts, the moving magnet is rotatably arranged outside the static magnet, and an air gap is reserved between the moving magnet and the static magnet, and a tension spring is arranged on the moving magnet to restore the moving magnet to its initial position; the moving magnet is linked to the micro switch; the magnetic tripping device and the micro switch are respectively located outside the chamber where the contact system and the excitation ignition component are located.

3. The recoverable excitation integrated contactor according to claim 2, characterized in that: The moving magnet is hingedly arranged on the outside of the static magnet, and an L-shaped lever is arranged on the moving magnet, and the L-shaped lever is linked with the contact piece of the micro switch; when the static magnet absorbs the moving magnet and rotates, the L-shaped lever is driven to move, and the L-shaped lever drives the micro switch contact piece to move to change the switching state of the micro switch.

4. The recoverable excitation integrated contactor according to claim 1, characterized in that: A first conductor is fixedly arranged on the impact end face of the first piston, and the auxiliary contact system includes a second conductor and a third conductor that are relatively spaced and insulated, and the insulating fracture is formed between the opposite ends of the first conductor and the third conductor, and the ends of the second conductor and the third conductor that are far away from each other are respectively conductively connected to the arc-extinguishing fuse and the static contact; the fuse-cutting push rod is located at the insulating fracture; when the first piston moves with the first conductor, the first conductor enters the insulating fracture, so that the second conductor and the third conductor are conductively connected, so that the arc-extinguishing fuse is connected in parallel to the main circuit, and at the same time, the first conductor drives the fuse-cutting push rod to move.

5. The recoverable excitation integrated contactor according to claim 4, characterized in that: The chamber where the arc-extinguishing melt is located is separated from the chamber where the first piston and the excitation ignition assembly are located by a middle partition, and a displacement channel is provided in the middle partition and the chamber where the arc-extinguishing melt is located; the melt-cutting push rod is integrally formed on the middle partition, and the connection between the melt-switching push rod and the middle partition is a disconnection weak point; an annular boss is provided on the outer peripheral side of the connection between the middle partition and the melt-cutting push rod in the direction of the first piston, and one end of the melt-cutting push rod is located in the displacement channel; The arc-extinguishing melt passes through the displacement channel and is located on the displacement path of the melt-cutting push rod; the free ends of the second conductor and the third conductor are placed on the annular bosses on opposite sides of the melt-cutting push rod and are bent into the bosses to form the insulating fracture.

6. The recoverable excitation integrated contactor according to claim 1, characterized in that: The elastic member is a bellows, one end of which is fixed to the outside of the chamber where the contact system is located, and the other end is a free end. One end of the airflow channel is located in the bellows, and the second piston is inserted into the airflow channel in the bellows, and one end of the second piston is fixedly connected to the free end of the bellows; a contact push rod is fixed on the impact end of the second piston, and an open trumpet-shaped groove is provided on the end face of the contact push rod facing the moving contact.

7. The recoverable excitation integrated contactor according to claim 1, characterized in that: An arc isolation plate is provided in the chamber where the contact system is located, and a limiting structure for limiting the displacement of the moving contact is provided on the arc isolation plate; when the second piston forces the moving contact and the static contact to form a large-break opening, the limiting structure limits the moving contact.

8. The recoverable excitation integrated contactor according to claim 2, characterized in that: The chamber where the drive system and the contact system are located is separated by a sealing partition, and a sealing cover plate is arranged on the sealing partition to form a sealed chamber where the contact system is located; an excitation shell is arranged on one side of the chamber where the drive system and the contact system are located, and the excitation ignition component, the first piston, the auxiliary contact system, the melt-cutting push rod, and the arc-extinguishing melt are arranged in the excitation shell; the excitation shell part where the excitation ignition component and the first piston are located is a convex structure; a shell is arranged in the chamber where the drive system and the contact system are located, and outside the excitation shell; One end of the static contact passes through the sealing cover plate and the outer shell and is located outside the outer shell, and the excitation ignition assembly passes through the excitation shell and the outer shell and is located outside the outer shell; the static magnet is located at the static contact between the outer shell and the sealing cover plate, and the dynamic magnet is hinged on the outside of the excitation shell, one end of the tension spring and the micro switch are respectively located on the outside of the convex structure part of the excitation shell.

9. The recoverable excitation integrated contactor according to any one of claims 1 to 8, characterized in that: A reaction spring is arranged on the outside of the melt-cutting push rod; a compression cross bar is arranged on the outside of the impact end of the first piston, and the compression cross bar extends beyond the upper end surface of the reaction spring and extends out of the chamber where the excitation ignition component is located, and is located on the contact side of the microswitch contact; a disconnection weak point is arranged on the compression cross bar; when the first piston is displaced, the compression cross bar is driven to displace, compressing the reaction spring, and squeezing the contact of the microswitch so that the microswitch always maintains the state after the switch state is changed; when the first displacement reaches the terminal position, the compression cross bar is disconnected from the disconnection weak point, and the reaction spring drives the compression cross bar to return to the initial position, and loses the squeezing of the contact of the microswitch.

10. The recoverable excitation integrated contactor according to claim 9, characterized in that: A guide rod is arranged on the compression cross bar, and the guide rod is penetrated in the free end of the reaction force spring.

11. The recoverable excitation integrated contactor according to claim 9, characterized in that: The annular boss on the outer side of the melt-cutting push rod is arranged corresponding to the disconnection weak point of the pressing cross bar.

12. The recoverable excitation integrated contactor according to claim 1, characterized in that: The excitation ignition component also retains a connection node that communicates with an external trigger circuit.

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