Integrated contactor with excitation function

Abstract

The utility model relates to the field of circuit protection, in particular to an integrated contactor with an excitation function, a first excitation ignition assembly, a first piston, an auxiliary contact system, a melt cut-off piece, a melt and a second piston are integrated in the contactor, and the melt and the auxiliary contact system are connected in series between two groups of static contacts. The second piston is driven by the first excitation ignition assembly or the second excitation ignition assembly; in a normal working state, the auxiliary contact system is not conducted, when overload current, short-circuit current or abnormal conditions occur, the first excitation ignition assembly acts to release driving force, the first piston is driven to displace, the auxiliary contact system is conducted, the melt is connected into a main loop in a parallel connection mode, then the second piston displaces, and after the contact system is switched off, the auxiliary contact system is switched on. And the first piston pushes the melt cutting piece to break the melt. When the device works normally, loss is low, and when overload, short circuit or abnormal conditions exist, zero-current cutting-off of a main loop can be achieved, and the breaking capacity and the breaking reliability are improved.

Description

Technical Field

[0001] The invention relates to the field of circuit protection, in particular to a contactor, in particular to an integrated contactor with an excitation function in which a fuse is integrated. 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 contactor is mainly responsible for the connection and disconnection of rated load and below current, and the fuse is mainly responsible for protective disconnection under overload and short circuit conditions. Due to the uncertainty of the fuse's protection of low overload current, the matching between the two devices, the fuse and the contactor, makes it impossible to achieve full-range current protection. At the same time, it is impossible to provide a safe and reliable isolation break when dealing with special accident situations (such as electric vehicle collisions). In addition, due to the large resistance of the fuse itself, a large amount of heat will be generated during the application process, the power consumption is large, and the two devices are also complex and occupy a large space in matching and space use.

[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 piston is driven by the driving force to move and the moving and static contacts are forced to separate after closing, 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] The technical problem to be solved by the present invention is to provide an integrated contactor with an excitation function. When an overload, short-circuit current or abnormal situation occurs, a fuse is first introduced in parallel in the main circuit formed by the moving contact and the stationary contact, and then the moving contact and the stationary contact are separated from the conductive contact, and then the fuse is melted or cut off. Zero current disconnection between the moving contact and the stationary contact is achieved, a large arc is avoided between the moving contact and the stationary contact, and the breaking capacity and breaking safety performance are improved.

[0005] In order to solve the above technical problems, the technical solution provided by the present invention is an integrated contactor with an excitation function, comprising: a drive system, a contact system, the contact system comprising a moving contact and two stationary contacts, the drive system comprising a displaceable moving guide rod, the moving contact being displaceably arranged on the moving guide rod; under normal working conditions, the moving guide rod of the drive system drives the moving contact and the stationary contact to open and close;

[0006] The integrated contactor is integrated with a first excitation ignition component, a first piston, an auxiliary contact system, a fuse cut-off piece, and a fuse which are sequentially arranged; the auxiliary contact system includes a moving auxiliary contact and a static auxiliary contact, and in an initial state, the moving auxiliary contact and the static auxiliary contact are insulated from each other; the fuse is connected in series with the auxiliary contact system, and the two ends of a branch formed by the series connection of the fuse and the auxiliary contact system are respectively connected in series between the two static contacts; the auxiliary contact system is arranged between the first piston and the fuse cut-off piece, and the fuse is penetrated in the arc extinguishing medium; in a normal working state, the moving auxiliary contact and the static auxiliary contact are insulated from each other;

[0007] A second piston is arranged between the two stationary contacts and opposite to the moving guide rod, and the second piston is driven by the first excitation ignition component or by the second excitation ignition component;

[0008] When the moving contact and the static contact are closed to form a main circuit, when an overload current, a short circuit current or an abnormal situation occurs, the first excitation ignition component releases a driving force according to the received trigger signal, drives the first piston to move, makes the moving auxiliary contact and the static auxiliary contact conductively contact, and connects the melt to the main circuit in parallel;

[0009] Then, the second piston is displaced to separate the moving contact from the static contact, and then the first piston pushes the melt cut-off piece to cut off the melt.

[0010] Preferably, when the second piston is driven by the first excitation ignition component, the top of the second piston is connected to the cavity between the driving force release end of the excitation ignition component after the displacement of the first piston and the first piston through an air channel, and when the first piston is in an initial position, the first piston closes the air channel; when the first excitation ignition component is actuated according to the received trigger signal, the first excitation ignition component drives the first piston to displace so that the moving auxiliary contact and the static auxiliary contact are in conductive contact, and after the melt is connected to the main circuit in parallel, the driving force released by the first excitation ignition component drives the second piston to displace through the air channel, and the second piston pushes the moving guide rod or the moving contact to displace, so that the moving contact and the static contact are forced to break away from conductive contact to open the gate, and after the moving contact and the static contact are broken away from conductive contact, the first piston pushes the melt cut-off piece to disconnect the melt.

[0011] Preferably, when the second piston is driven by the second excitation ignition component, a resistor is connected in series at the signal receiving end of the second excitation ignition component, or a resistor is connected in series in the trigger signal sending circuit of the second excitation ignition component; when the trigger signal is sent to the first excitation ignition component and the second excitation ignition component, the first excitation ignition component first acts to release the driving force, drives the first piston to displace so that the moving auxiliary contact and the static auxiliary contact are in conductive contact, and after the melt is connected to the main circuit in parallel, the second excitation ignition component then acts to release the driving force, drives the second piston to displace, pushes the moving guide rod or the moving contact to displace, so that the moving contact and the static contact are forced to break away from conductive contact to open the gate, and after the moving contact and the static contact are broken away from conductive contact, the first piston pushes the melt cut-off piece to disconnect the melt.

[0012] Preferably, one end of the moving auxiliary contact is conductively connected to one of the static contacts, and one end of the static auxiliary contact is conductively connected to one end of the melt, or one end of the static auxiliary contact is conductively connected to one of the static contacts, one end of the moving auxiliary contact is conductively connected to one end of the melt, and the other end of the melt is conductively connected to another static contact. The moving auxiliary contact and the static auxiliary contact are offset and arranged on the displacement path of the first piston with an insulation distance therebetween. When the moving auxiliary contact is driven by the first piston, the moving auxiliary contact is displaced toward the static auxiliary contact and conductively contacts therewith, so that the melt is connected to the main circuit in parallel.

[0013] Preferably, the movable auxiliary contact and the static auxiliary contact are in conductive contact in a flat plate manner, in conductive contact by interference insertion, or in conductive contact by stamping deformation insertion.

[0014] Preferably, when the conductive contact is made in a flat plate manner, the movable auxiliary contact and the static auxiliary contact are both flat plate structures, and when they are in conductive contact, the two opposite surfaces of the movable auxiliary contact and the static auxiliary contact are in conductive contact;

[0015] When the contact is made by interference insertion, the movable auxiliary contact is a columnar structure, and the position of the static auxiliary contact corresponding to the columnar structure is set as a hollow structure or a hollow structure. When they are in conductive contact, the columnar structure of the movable auxiliary contact is inserted into the hollow structure of the static auxiliary contact, or penetrates and is inserted into the hollow structure of the static auxiliary contact, so that the static auxiliary contact is in conductive contact by interference insertion.

[0016] When the movable auxiliary contact is in contact by means of stamping deformation and insertion for conductive contact, the movable auxiliary contact is a flat plate structure, and the static auxiliary contact is a hollow structure. The first piston drives the movable auxiliary contact to enter the hollow structure of the static auxiliary contact in a deformed state, and makes conductive contact with the static auxiliary contact. At the same time, the impact end of the first piston passes through the hollow structure of the static auxiliary contact, and drives the fuse cut-off piece to disconnect the melt.

[0017] Preferably, when the movable auxiliary contact is a columnar structure, a spike structure is provided on the outer peripheral surface of the columnar structure.

[0018] Preferably, when the movable auxiliary contact is a columnar structure, the movable auxiliary contact is protrudingly arranged on the impact end surface of the first piston.

[0019] Preferably, the static auxiliary contact and the dynamic auxiliary contact are respectively conductively connected to the static contact and the fuse through soft connecting wires.

[0020] Preferably, it comprises a melt shell and a melt cover plate covering the melt shell, a displacement channel is opened on the melt shell and the melt cover plate at the corresponding position of the melt cut-off piece, an arc extinguishing medium is filled between the melt shell and the melt cover plate outside the displacement channel, and the melt passes through the arc extinguishing medium and the displacement channel; the melt cut-off piece is integrally connected to the melt cover plate at the displacement channel; when the first piston is driven to displace, the moving auxiliary contact and the static auxiliary contact are first brought into conductive contact, and then continue to displace to disconnect the melt cut-off piece from the melt cover plate, and drive the melt cut-off piece to displace along the displacement channel to disconnect the melt.

[0021] Preferably, a first annular protrusion is provided on the surface of the melt cover plate located at the displacement channel facing the first piston, the static auxiliary contact includes a conductive contact portion, a limiting edge is provided at the end of the conductive contact portion, the conductive contact portion of the static auxiliary contact is penetrated in the first protrusion, and the limiting edge is overlapped on the end of the first protrusion; when the first piston is displaced, the dynamic auxiliary contact is driven to enter the first protrusion in a stamping deformation manner, and after conductive contact with the static auxiliary contact; the impact end of the first piston passes through the first protrusion to drive the melt cut-off piece to disconnect from the melt cover plate.

[0022] Preferably, the drive system and the contact system are integrated in a contactor housing, and the wiring terminal of the static contact is located outside the contactor housing; the melt cover plate, the melt housing, the melt, the auxiliary contact system, and the first piston are integrated in an excitation housing, and the excitation housing is fixedly connected to the outside of the contactor housing in a detachable manner, and the two free ends of the auxiliary contact system and the melt connected in series are respectively extended out of the excitation housing, and are conductively connected to the wiring terminal of the static contact outside the contactor housing in a detachable manner; the excitation housing is filled with an inert gas.

[0023] Preferably, the drive system and the contact system are respectively located in two adjacent and insulated chambers, and the integrated contactor is filled with an inert gas for arc extinguishing.

[0024] Its beneficial effects are:

[0025] When the contactor is in normal working condition, since the fuse is not connected to the main circuit, the temperature rise and power loss caused by the fuse are zero. Therefore, under normal working condition, the power loss and heat generation of the contactor with integrated excitation function are reduced;

[0026] By connecting the parallel fuse in case of overload, short circuit or abnormal situation, the moving and static contacts form a main circuit to achieve zero current cutoff, avoiding high current arc when the moving and static contacts are disconnected, and avoiding possible ablation and damage to the moving and static contacts.

[0027] By attaching an external excitation shell to the outside of the contactor shell, when the second piston and the second excitation ignition assembly are not integrated in the contactor shell, after the first excitation ignition assembly is actuated, the contactor shell and its internal components can perform normal opening and closing operations, and only the external excitation shell needs to be removed; when maintenance and replacement are required, only the external excitation shell needs to be replaced, which can reduce the maintenance and replacement costs.

[0028] Through the external excitation shell, standard modular production can be achieved. When it is necessary to introduce an excitation function in the contactor, it can be achieved by directly plugging in the external excitation shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the appearance structure of Example 1.

[0030] Figure 2 yes Figure 1 Schematic diagram of the structure from a perspective parallel to the line connecting the two static contacts.

[0031] Figure 3 yes Figure 1 Schematic diagram of the structure from a perspective perpendicular to the line connecting the two static contacts.

[0032] Figure 4 yes Figure 1 A three-dimensional partial cross-sectional structural schematic diagram of .

[0033] Figure 5 yes Figure 2 AA section view.

[0034] Figure 6 yes Figure 2 CC cross-sectional view.

[0035] Figure 7 yes Figure 3 BB cross-sectional view.

[0036] Figure 8-1 It is a schematic diagram of the initial position structure of the auxiliary contact system with stamping deformation conductive contact.

[0037] Figure 8-2 It is a schematic diagram of the structure of the auxiliary contact system after conductive contact, including the first piston movement position.

[0038] Figure 8-3 Schematic diagram of the structure of the auxiliary contact system after conductive contact.

[0039] Fig. 9 It is a schematic diagram of the appearance structure of Example 2.

[0040] Fig.10 yes Fig. 9 Schematic diagram of the structure from a perspective perpendicular to the line connecting the two static contacts.

[0041] Fig.11 yes Fig.10 EE cross-sectional view.

[0042] Fig.12 It is a schematic diagram of the appearance structure of Example 4.

[0043] Fig.13 It is a schematic diagram of the connection between the fuse and the static contact through a set of auxiliary contact systems.

[0044] Fig.14 Schematic diagram of the connection between the melt and the stationary contact through two sets of auxiliary contact systems.

[0045] Fig.15 It is a schematic diagram of two fuses connected in series through a set of auxiliary contact systems and then connected to the static contact.

[0046] Reference numerals:

[0047] Shell 10, top chamber 11, bottom chamber 12, excitation chamber 13, static contact 14, moving contact 15, drive coil 16, magnetic ring 161, moving iron core 17, static iron core 18, moving guide rod 19, moving contact spring 20, first excitation ignition assembly 21, first piston 22, sleeve 221, melt cover plate 23, melt 24, moving auxiliary contact 25, static auxiliary contact 26, melt shell 27, support column 28, arc extinguishing medium 29, first protrusion 30, second protrusion 31, melt cut-off piece 33, guide cylinder 34, airway 35, second piston 36, second excitation ignition assembly 37, excitation shell 38, contactor shell 39, connection end 40, partition plate 41, sealing cover plate 42, arc extinguishing chamber 43, auxiliary contact system 44. DETAILED DESCRIPTION

[0048] The integrated contactor with excitation function of the present invention comprises: a driving system and a contact system, wherein the contact system comprises a moving contact and two stationary contacts, and the driving system comprises a movable moving guide rod, on which the moving contact is displaceably arranged; under normal working state, the moving guide rod of the driving system drives the moving contact and the stationary contact to open and close;

[0049] The integrated contactor is integrated with a first excitation ignition component, a first piston, an auxiliary contact system, a fuse cut-off piece, and a fuse which are arranged in sequence; the auxiliary contact system includes a moving auxiliary contact and a static auxiliary contact, and in the initial state, the moving auxiliary contact and the static auxiliary contact are insulated from each other; the fuse and the auxiliary contact system are connected in series, and the two ends of the branch formed by the series connection of the fuse and the auxiliary contact system are respectively connected in series between the two static contacts; the auxiliary contact system is arranged between the first piston and the fuse cut-off piece, and the fuse is penetrated in the arc extinguishing medium; in the normal working state, the moving auxiliary contact and the static auxiliary contact are insulated from each other;

[0050] A second piston is arranged between the two stationary contacts and opposite to the moving guide rod, and the second piston is driven by the first excitation ignition component or by the second excitation ignition component;

[0051] When the moving contact and the static contact are closed to form a main circuit, when an overload current, a short circuit current or an abnormal situation occurs, the first excitation ignition component releases the driving force according to the received trigger signal, drives the first piston to move, makes the moving auxiliary contact and the static auxiliary contact to be in conductive contact, and connects the melt to the main circuit in parallel;

[0052] Then, the second piston moves to separate the moving contact from the stationary contact, and the first piston pushes the melt-cutting piece to disconnect the melt.

[0053] The above technical solution is specifically described with reference to a preferred embodiment. The directional words involved in the description are based on the directions shown in the drawings and do not constitute a limitation on the technical solution of the present invention.

[0054] Example 1

[0055] See also Figures 1 to 7 The integrated contactor with excitation function of the present invention comprises a housing 10, which is mainly divided into four mutually insulated chambers, namely, a top chamber 11, a bottom chamber 12, an excitation chamber 13 and an arc extinguishing chamber 43. The top chamber 11 is located above the bottom chamber 12, and the top chamber 11 and the bottom chamber 12 are separated by a partition 41. The excitation chamber 13 and the arc extinguishing chamber 43 are located on the sides of the top chamber 11 and the bottom chamber 12, and the excitation chamber 13 is located above the arc extinguishing chamber 43, and the excitation chamber 13 and the arc extinguishing chamber 43 are separated by a melt cover plate 23. The top chamber 11, the bottom chamber 12 and the excitation chamber 13 are respectively filled with gaseous arc extinguishing media, such as air, inert gas, such as nitrogen.

[0056] The housing 10 is provided with a contact system, a drive system, a first excitation ignition assembly 21 , a first piston 22 , an auxiliary contact system, a melt cut-off piece 23 , a melt 24 , and a second piston 36 .

[0057] A sealing cover plate 42 is arranged on the partition plate 41 and the melt cover plate 23. The sealing cover plate 42 is located in the housing 10. A protective sleeve 221 is arranged in the sealing cover plate 42 to divide the internal space of the sealing cover plate 42 into a top chamber 11 and an excitation chamber 13. The chamber where the protective sleeve 221 is located is the excitation chamber 13. The contact system is arranged in the top chamber 11, and the drive system is arranged in the bottom chamber 12. The contact system includes a static contact 14 and a moving contact 15. There are two static contacts 14, and the two static contacts 14 are arranged on the sealing cover plate 42 with insulation, one end of which passes through the sealing cover plate 42 and the housing 10 and is located outside the housing 10, and the other end of which passes through the sealing cover plate 42 and is located inside the sealing cover plate 42. The terminal of the static contact 14 extends out of the housing 10 and can be conductively connected to the outside. The terminal of the static contact 14 is a terminal post structure, and a threaded connection hole is opened on it. The moving contact 15 is located in the sealing cover plate 42, and is arranged opposite to the two groups of stationary contacts. In the initial position, the moving contact 15 and the stationary contact 14 maintain an insulation distance, and are in a normal opening position.

[0058] The driving system includes a driving coil 16, a moving iron core 17, a static iron core 18, and a moving guide rod 19. The moving guide rod 19 is fixedly arranged on the moving iron core 17, the static iron core 18 is located at the top of the bottom chamber 12, and the moving iron core 17 is located below the static iron core 18. A magnetic ring 161 is arranged on the outer periphery of the moving iron core 17, the static iron core 18, and the driving coil 16, and the magnetic ring 161 is located below the partition. The upper end of the moving guide rod 19 passes through the static iron core 18, the magnetic ring and the partition and is located in the top chamber 11. A limiting ring rib is arranged on the outer periphery of the moving guide rod 19 in the top chamber 11, and a limiting plate is arranged on the upper end of the moving guide rod 19. The moving contact 15 is inserted between the limiting ring rib and the limiting plate. A moving contact spring 20 is sleeved between the moving contact 15 and the limiting ring rib to support the moving contact 15. The moving contact can be displaced along the moving guide rod, and the contact spring 20 is always in a compressed state. When the moving contact and the static contact are in conductive contact, the moving contact spring 20 buffers the impact force during contact. The moving guide rod 19 moves synchronously with the moving contact, and relative displacement may also occur. For example, the moving guide rod 19 drives the moving contact and the static contact to close, but at the moment of closing, the moving guide rod 19 still has a certain displacement. At this time, due to the obstruction of the static contact, the moving contact stops moving, and a relative displacement occurs between the moving guide rod and the moving contact. The contact spring is further compressed to buffer the impact force when the moving contact and the static contact are in conductive contact. When the moving guide rod is displaced to open the moving contact and the static contact, the moving guide rod is displaced first, and then contacts the moving contact, and moves synchronously with the moving contact to open the door. When the moving contact is driven by an external force and breaks away from the conductive contact with the static contact to open the door, the moving contact is displaced relative to the moving guide rod, and the contact spring is further compressed.

[0059] The inner diameter of the through hole on the partition through which the moving guide rod 19 passes is larger than the outer diameter of the moving guide rod and smaller than the outer diameter of the limiting ring rib. In the normal opening position, the limiting ring rib on the moving guide rod 19 is located above the through hole on the partition. The through hole on the partition is sealed by a magnetic conductive ring located below the partition.

[0060] The protective sleeve 221 and the melt cover plate form an excitation chamber 13, and the melt shell 27 and the melt cover plate 23 form an arc extinguishing chamber 43, that is, the melt cover plate 23 is arranged between the protective sleeve 221 and the melt shell 27. The first excitation ignition assembly 21, the first piston 22, and the auxiliary contact system are arranged in the excitation chamber 13. The melt 24 and the arc extinguishing medium 29 are arranged in the arc extinguishing chamber 43.

[0061] The first excitation ignition component 21 is a gas generating device that can ignite according to the received trigger signal and release high-pressure gas as a driving force. The first excitation ignition component 21 is located at the top of the sleeve 221, and its signal receiving end passes through the top of the sleeve 221 and the shell 10, and is located outside the shell 10, and can be connected to the external trigger signal sending end. Its driving force release end is located inside the sleeve 221.

[0062] The first piston 22 is located below the first excitation ignition component 21. In this embodiment, the first piston 22 is T-shaped, and a groove is provided at the large end close to the first excitation ignition component 21. The driving force release end of the first excitation ignition component 21 is located in the groove at the end face of the first piston 22, so that the released driving force can be concentrated on the first piston 22 at the first time; the small end is the impact end. A sealing ring is provided on the outer peripheral side surface of the large end of the first piston 22, and the sealing ring is in sealing contact with the inner wall of the sleeve 221 to achieve the initial position positioning of the first piston 22.

[0063] An air passage 35 and a guide cylinder 34 integrally connected to the air passage 35 are integrally formed on the sealing cover plate 42. A communication port is provided at the position of the sleeve 221 corresponding to the air passage 35, so that the air passage 35 is connected to the cavity between the end of the electronic ignition component driving force release and the first piston. In the initial position, the first piston 22 closes the communication port of the sleeve 221, that is, closes the air passage 35. The guide cylinder 34 is located between the two static contacts 14, and a second piston 36 is arranged in the guide cylinder 34, and the second piston 36 is arranged opposite to the moving guide rod 19. A sealing ring is arranged on the outer periphery of the second piston 36, so that the second piston 36 is in sealing contact with the guide cylinder 34.

[0064] A melt shell 27 is arranged below the melt cover plate 23, and the melt cover plate 23 closes the melt shell 27, so that the melt cover plate 23 and the melt shell 27 form an arc extinguishing chamber 43. A support column 28 protruding from the bottom of the melt shell is arranged at the bottom of the melt shell 27, and a groove for displacement is arranged on the upper end surface of the support column. A first protrusion 30 protruding from the upper surface is arranged on the upper surface of the melt cover plate 23, and the impact end of the first piston is arranged corresponding to the hollow part of the first protrusion 30. A second protrusion 31 protruding from the lower surface of the melt cover plate 23 is arranged at the position of the melt cover plate 23 corresponding to the support column. Hollow parts are respectively opened on the first protrusion 30 and the second protrusion 31. The second protrusion 31 on the lower surface of the melt cover plate 23 is docked with the support column 28 of the melt shell 27, and the hollow parts of the first protrusion 30 and the second protrusion 31 and the groove of the support column 28 form a displacement channel. The cavity between the melt cover plate 23 and the melt shell 27 outside the displacement channel is filled with an arc extinguishing medium 29, which is quartz sand.

[0065] The melt cut-off piece 33 is located in the displacement channel between the first protrusion 30 and the second protrusion 31 of the melt cover plate 23, and is integrally connected to the melt cover plate 23, and the connection is set to be a disconnection weak point, such as a thinned thickness, or a hollow structure that is easy to disconnect mechanically. The melt cut-off piece 33 is set corresponding to the first piston. The melt 24 is set in the arc extinguishing medium and the displacement channel between the melt cover plate 23 and the melt shell 27. After the two ends of the melt 24 pass through the melt cover plate 23, one end of the melt 24 is conductively connected to one of the static contacts, and the other end is conductively connected to the other static contact through the auxiliary contact system. The melt 24 is located on the displacement path of the melt cut-off piece 33. The resistance of the melt 24 is much greater than the resistance of the main circuit formed after the static contact and the moving contact are conductively contacted. A narrow neck and a pre-break are set on the melt 24, and the narrow neck and pre-break of the melt 24 are located in the arc extinguishing medium. Positioning structures such as positioning columns are provided in the melt cover and the melt housing to position the melt 24. When the first piston is displaced, the movable auxiliary contact and the static auxiliary contact can be brought into conductive contact, so that the melt cut-off piece 33 is disconnected from the melt cover at the disconnection weak point.

[0066] The auxiliary contact system 44 includes a moving auxiliary contact 25 and a static auxiliary contact 26. One end of the melt 24 is conductively connected to one end of the static auxiliary contact 26 through a flexible connector, and the other end of the melt 24 is conductively connected to one of the static contacts 14. One end of the moving auxiliary contact 25 is conductively connected to another static contact 14 through a flexible connector, and the other end of the moving auxiliary contact 25 and the other end of the static auxiliary contact 26 are arranged in a displacement direction of the first piston 22 at a certain insulation distance, that is, the other end of the moving auxiliary contact 25 and the other end of the static auxiliary contact 26 are arranged opposite to each other in the displacement direction of the first piston at a certain insulation distance, and in the initial position, the insulation distance is maintained. When the first piston is displaced, the other end of the moving auxiliary contact 25, which is arranged in a certain insulation distance and in a displaced and overlapping manner, can be driven to conductively contact with the other end of the static auxiliary contact 26, so that the melt 24 is connected in parallel to the main circuit formed after the static contact and the moving contact are closed. The other end of the movable auxiliary contact 25 and the other end of the stationary auxiliary contact 26 are supported by the fusible cut-off piece 23 , respectively.

[0067] For the specific structure of auxiliary contact system, see Figure 8-1 to Figure 8-3The static auxiliary contact 26 has a hollow portion, and an outward-turned limiting edge is provided on the end surface of the hollow portion facing the dynamic auxiliary contact 25. The static auxiliary contact 26 is located in the hollow portion of the limiting convex ring 30 of the melt cover plate 23, and its limiting edge is laid on the end of the limiting convex ring 30 to support the static auxiliary contact 26. One end of the dynamic auxiliary contact 25 has a flat plate structure, and one end of the flat plate structure is suspended and staggered and overlapped between the limiting convex ring 30 and the first piston. When the first piston is driven to move, the impact end of the first piston drives one end of the flat plate structure of the moving auxiliary contact 25 to move toward the direction of the static auxiliary contact 26, and the impact end of the first piston brings one end of the flat plate structure of the moving auxiliary contact 25 into the hollow part of the static auxiliary contact 26, so that one end of the flat plate structure of the moving auxiliary contact 25 is deformed under the impact of the first piston and then conductively contacts with the static auxiliary contact. The first piston continues to move, passes through the static auxiliary contact and the limiting convex ring 30, drives the melt cut-off piece 33 to disconnect from the melt cover plate 23, and then moves along the displacement channel to break the first melt, and the fracture of the first melt is located in the arc extinguishing medium.

[0068] In the above description, the auxiliary contact system is made of conductive material, the fusible cut-off piece is made of insulating material, the impact end of the first piston can be made of conductive material or insulating material, and the second piston is made of insulating material.

[0069] The working principle of this embodiment:

[0070] Under normal working conditions, the first excitation ignition component, the first piston, and the second piston do not move, and the drive system and the contact system work normally, achieving normal opening and closing of the contactor.

[0071] When there is an overload or short-circuit current, the first excitation ignition component receives a trigger signal, ignites and releases high-pressure gas as a driving force, drives the first piston 22 to move first, and the first piston 22 drives the moving auxiliary contact to move toward the static auxiliary contact. The moving auxiliary contact 25 is deformed by stamping and conductively contacts with the static auxiliary contact 26, and the melt 24 is connected in parallel to the main circuit formed by the conductive contact between the static contact and the moving contact; after the melt 24 is connected to the main circuit, due to the displacement of the first piston 22, the opening at the sleeve 221 is connected to the cavity between the first excitation ignition component and the first piston, and the driving force enters the guide cylinder 34 through the airway 35, driving the second piston 36 to move, and the second piston 36 pushes the moving guide rod to move, forcing the moving contact 15 and the static contact 14 to break away from the conductive contact, and then drives the moving contact 15 to move to the normal opening position. After the moving contact 15 and the static contact 14 are separated from the conductive contact, the static fuse 24 with a large current in the main circuit flows through, and the fuse 24 is melted under the thermal effect; while the second piston 34 pushes the moving contact and the static contact to separate from the conductive contact, the first piston 22 continues to move to separate the fuse cut-off piece 33 from the fuse cover plate 23, and the fuse cut-off piece 33 moves along the displacement channel. When the moving contact and the static contact are separated from the conductive contact and the moving contact is moved to the normal opening position, the first piston 22 drives the fuse cut-off piece 33 to break the fuse 24, thereby realizing the zero current cut-off of the main circuit.

[0072] When an abnormal situation occurs, the difference from overload or short-circuit current is that since there is no large current in the main circuit, after the moving contact and the static contact are out of conductive contact, no large current will flow through the fuse, and the fuse will not melt. The fuse can only be disconnected mechanically through the fuse cut-off piece.

[0073] Arc extinguishing principle:

[0074] Under normal working conditions, current flows through the main circuit formed by the static contact and the moving contact connected in series. Since the auxiliary contact system is in an insulated disconnected state, the fuse 24 is not connected to the main circuit, and no current flows through the fuse 24. The fuse 24 will not produce any temperature rise or power loss.

[0075] When there is an overload or short-circuit current, the fuse 24 is first connected to the main circuit in parallel. Since the resistance of the fuse 24 is much larger than the resistance of the main circuit, the current flowing through the fuse 24 is very small and can be ignored. As the second piston causes the moving contact and the stationary contact to break away from the conductive contact, the resistance of the main circuit is instantly very large, and the current flows through the fuse 24. After the moving contact and the stationary contact break away from the conductive contact, almost no arc is generated at the fracture formed between the moving and stationary contacts, or the generated arc is very small. The arc generated when the moving contact and the stationary contact break away from the conductive contact is extinguished by the gas arc extinguishing medium filled in the top chamber; a large current flows through the fuse, and due to the large resistance of the fuse, a current limit is formed, and the current flowing through the fuse 24 is reduced by multiples. Under the thermal effect, the fuse is first melted from the narrow neck in the arc extinguishing medium. Due to the reduction in current, the generated arc is relatively small and is extinguished by the arc extinguishing medium; as the first piston continues to move, the fuse cut-off piece 33 is pushed to mechanically disconnect the fuse 24 from the pre-break, forming a physical insulating fracture on the fuse 24 in the arc extinguishing medium, and completely disconnecting the circuit.

[0076] When there is an abnormal situation, the melt can only be mechanically disconnected from the pre-break of the melt by the first piston driving the melt cut-off piece. Since the break of the melt is located in the arc extinguishing medium, the arc extinguishing medium directly participates in arc extinguishing.

[0077] In this embodiment, the moving guide rod driven by the second piston drives the moving contact to move, and the contact system is opened to the normal opening position through the moving guide rod. In other embodiments, the moving contact can also be driven by the second piston to drive the moving guide rod to move. Since the second piston presses the moving contact and thus presses the moving contact spring, when the second piston drives the moving contact to move, large-break opening is achieved. When the large-break opening is achieved, the insulation distance between the moving and static contacts is greater than the insulation distance between the moving and static contacts during normal opening.

[0078] Example 2

[0079] See also Figures 9 to 11 On the basis of Example 1, no opening communicating with the airway is provided on the sleeve 221 and the guide cylinder 34, and the airway is removed.

[0080] A second excitation ignition component 37 is provided on the housing 10 above the second piston 36, and one end of the second excitation ignition component 37 for releasing the driving force is located in the guide tube 34. A resistor is connected in series to the signal receiving end of the second excitation ignition component 37. The first excitation ignition component 21 and the second excitation ignition component are respectively connected to the trigger signal sending circuit to receive the trigger signal. Since the first excitation ignition component has no resistor connected in series, the first excitation ignition component is directly triggered after receiving the trigger signal, and the ignition releases the driving force; the second excitation ignition component is connected in series with a resistor, and the actual current signal received by the second excitation ignition component is smaller than the triggering current, then the second excitation ignition component needs to accumulate for a certain period of time to reach the required ignition temperature, and ignite, thereby realizing the control of the sequential actions of the first excitation ignition component and the second excitation ignition component.

[0081] In other embodiments, a resistor may be connected in series in the trigger signal sending circuit connected to the second excitation ignition component to reduce the trigger signal current received by the second excitation ignition component, thereby realizing the sequential action of the first excitation ignition component and the second excitation ignition component.

[0082] Embodiment 1 controls the sequential movement of the first piston and the second piston through the airway and the airway opening. Embodiment 2 reduces the trigger current received by the second excitation ignition component through a series resistor to control the sequential movement of the first excitation ignition component and the second excitation ignition component, thereby realizing the sequential movement of the first piston and the second piston.

[0083] Except that the first excitation ignition component and the second excitation ignition component are controlled to move in sequence through a series resistor, which is different from the first piston and the second piston being controlled to move in sequence through an airway, other operating principles are the same as those in Example 1.

[0084] Example 3

[0085] The structures of the above-mentioned embodiments 2 to 3 are shown in FIG. Fig.12The first excitation ignition assembly 21, the first piston 22, the auxiliary contact system, the fuse cut-off piece 23, the fuse 24, etc. located in the excitation chamber 13 and the arc extinguishing chamber 43 are integrated into a separate excitation housing 38, and the excitation housing 38 is filled with arc extinguishing gas. The contact system, the drive system, the second piston, and the second excitation ignition assembly located in the top chamber and the bottom chamber are integrated to form a contactor 39, which can realize the normal opening and closing function of the contactor. When the contactor does not include the second piston and the second excitation ignition assembly, it is actually an ordinary contactor structure. In the excitation housing 38, the two connection ends 40, that is, the two free ends of the series-connected fuse and auxiliary contact system, extend out of the excitation housing, bend and extend outward to one side of the excitation housing. Connecting through holes are provided on the two connection ends 40. In the contactor 39, the wiring terminals of the two static contacts 14 are located outside the contactor housing, and connecting threaded holes are provided at the wiring terminals. The excitation housing 38 is fixedly connected to one side surface of the contactor 39 by bolts, and the two connection terminals 40 are placed on the terminal of the static contact of the contactor. The terminal 40 of the excitation housing and the terminal of the contactor are conductively connected together by screws.

[0086] The structure of this embodiment is convenient for modular production. At the same time, when an overload, short circuit or abnormal situation occurs, after the excitation shell is actuated, when the second piston and the second excitation ignition assembly are not integrated in the contactor, the contactor can continue to perform normal opening and closing operations. If the excitation shell needs to be replaced, only the external excitation shell needs to be replaced.

[0087] In the above embodiments, the melt 24 is connected to the stationary contact through a set of auxiliary contact systems 44, and the connection method is as follows: Fig.13 The auxiliary contact system can also be set up as two groups, and the connection method is as follows: Fig.14 As shown, Fig.14 When connected through two sets of auxiliary contact systems 44, the first piston 22 needs to make the two sets of auxiliary contact systems 44 conductively connected; it can also be designed as two melts connected in series, such as Fig.15 As shown, one end of the two fuses 24 is respectively conductively connected to the stationary contact, and the two fuses are connected via a set of auxiliary contact systems 44 .

[0088] The conductive contact between the movable auxiliary contact 25 and the static auxiliary contact 26 in the above-mentioned embodiments can be in the form of flat plate conductive contact, interference insertion conductive contact, or stamping deformation insertion conductive contact.

[0089] Regardless of the conductive contact mode, the adjacent ends of the movable auxiliary contact 25 and the static auxiliary contact 26 are staggered and insulated. Staggered insulation setting structure: one end of the static auxiliary contact 26 is located on the displacement path of one end of the movable auxiliary contact 25, and an insulation distance is reserved between one end of the static auxiliary contact 26 and one end of the movable auxiliary contact 25; when one end of the movable auxiliary contact 25 is displaced by the first piston, one end of the movable auxiliary contact 25 can be in conductive contact with one end of the static auxiliary contact 26.

[0090] When conducting contact is made in a flat plate manner, one end of the static auxiliary contact 26 and one end of the moving auxiliary contact 25 which are arranged with offset insulation are both planar structures. After conducting contact, the surface of one end of the moving auxiliary contact 25 is in conductive contact with the surface of one end of the static auxiliary contact 26.

[0091] In order to buffer the impact force during conductive contact, an insulating guide column is provided, and the movable auxiliary contact 25 and the static auxiliary contact 26 are respectively inserted into the guide column, and a spring is sleeved on the guide column to support the movable auxiliary contact 25 and the static auxiliary contact 26. When the movable auxiliary contact 25 is impacted by the first piston and conductively contacts with the static auxiliary contact 26, it is compressed by the spring under the driving of the impact force, thereby achieving impact force buffering.

[0092] When the contact is made by interference insertion and conductive contact, one end of the movable auxiliary contact 25 is a columnar structure, and one end of the static auxiliary contact 26 opposite to one end of the columnar structure of the movable auxiliary contact 25 is a structure such as a groove structure or a hollow structure that allows the columnar structure to be inserted. When one end of the columnar structure of the movable auxiliary contact 25 is driven and displaced by the first piston, one end of the columnar structure of the movable auxiliary contact 25 can be inserted into the groove of the static auxiliary contact 26 by interference to make conductive contact, or break through the hollow structure and make conductive contact with the static auxiliary contact 26 by interference. In order to improve the contact performance, a spike structure is provided on the periphery of the columnar structure of the movable auxiliary contact 25.

[0093] When one end of the movable auxiliary contact 25 is a columnar structure, the movable auxiliary contact 25 can be arranged on the impact end surface of the first piston, and the movable auxiliary contact 25 is connected to the static contact through a flexible connecting wire.

[0094] When contacting by stamping deformation and insertion, refer to Figure 8-1 to Figure 8-3, one end of the movable auxiliary contact 25 is a flat plate structure, and the static auxiliary contact 26 has a hollow part and a limiting edge, and its shape is similar to a U-shaped structure. When one end of the movable auxiliary contact 25 flat plate structure is impacted by the first piston, the movable auxiliary contact 25 is bent toward the static auxiliary contact 26 and contacts the static auxiliary contact 26, and its two side edges overlap the limiting edges of the static auxiliary contact 26. Under the impact force of the first piston, the movable auxiliary contact 25 continues to deform under the joint action of the first piston and the static auxiliary contact 26 until the flat plate structure is deformed into a U-shaped guide groove structure that can pass through the hollow part of the static auxiliary contact 26. The first piston continues to move, moves along the U-shaped guide groove structure of the movable auxiliary contact 25, passes through the hollow part of the static auxiliary contact 26, and presses the deformed end of the movable auxiliary contact 25 against one side of the hollow part of the static auxiliary contact 26. During the entire deformation process until the end, the movable auxiliary contact 25 and the static auxiliary contact 26 always maintain a conductive contact state.

[0095] In each embodiment of the present invention, when the first piston is actuated to connect the melt in parallel to the main circuit formed by the conductive contact between the static contact and the moving contact, the drive coil is de-energized; alternatively, after the second piston forcibly opens the moving contact and the static contact, the drive coil is de-energized, and the drive coil is de-energized in a manner that the control system controls the entire system to de-energize.

Claims

1. An integrated contactor with an excitation function, characterized in that: include: A drive system and a contact system, wherein the contact system comprises a moving contact and two stationary contacts, and the drive system comprises a movable moving guide rod, on which the moving contact is displaceably arranged; under normal working conditions, the moving guide rod of the drive system drives the moving contact and the stationary contact to open and close; The integrated contactor is integrated with a first excitation ignition component, a first piston, an auxiliary contact system, a fuse cut-off piece, and a fuse which are sequentially arranged; the auxiliary contact system includes a moving auxiliary contact and a static auxiliary contact, and in an initial state, the moving auxiliary contact and the static auxiliary contact are insulated from each other; the fuse is connected in series with the auxiliary contact system, and the two ends of a branch formed by the series connection of the fuse and the auxiliary contact system are respectively connected in series between the two static contacts; the auxiliary contact system is arranged between the first piston and the fuse cut-off piece, and the fuse is penetrated in the arc extinguishing medium; in a normal working state, the moving auxiliary contact and the static auxiliary contact are insulated from each other; A second piston is arranged between the two stationary contacts and opposite to the moving guide rod, and the second piston is driven by the first excitation ignition component or by the second excitation ignition component; When the moving contact and the static contact are closed to form a main circuit, when an overload current, a short circuit current or an abnormal situation occurs, the first excitation ignition component releases a driving force according to the received trigger signal, drives the first piston to move, makes the moving auxiliary contact and the static auxiliary contact conductively contact, and connects the melt to the main circuit in parallel; Then, the second piston is displaced to separate the moving contact from the static contact, and then the first piston pushes the melt cut-off piece to cut off the melt.

2. The integrated contactor with excitation function according to claim 1, characterized in that: When the second piston is driven by the first excitation ignition component, the top of the second piston is connected to the cavity between the driving force release end of the excitation ignition component after the displacement of the first piston and the first piston through the air channel. When the first piston is in the initial position, the first piston closes the air channel; when the first excitation ignition component is actuated according to the received trigger signal, the first excitation ignition component drives the first piston to displace so that the moving auxiliary contact and the static auxiliary contact are in conductive contact, and after the melt is connected to the main circuit in parallel, the driving force released by the first excitation ignition component drives the second piston to displace through the air channel, and the second piston pushes the moving guide rod or the moving contact to displace so that the moving contact and the static contact are forced to break away from conductive contact to open the gate. After the moving contact and the static contact are broken away from conductive contact, the first piston pushes the melt cut-off piece to disconnect the melt.

3. The integrated contactor with excitation function according to claim 1, characterized in that: When the second piston is driven by the second excitation ignition component, a resistor is connected in series at the signal receiving end of the second excitation ignition component, or a resistor is connected in series in the trigger signal sending circuit of the second excitation ignition component; when the trigger signal is sent to the first excitation ignition component and the second excitation ignition component, the first excitation ignition component first acts to release the driving force, drives the first piston to move so that the moving auxiliary contact and the static auxiliary contact are in conductive contact, and after the melt is connected to the main circuit in parallel, the second excitation ignition component then acts to release the driving force, drives the second piston to move, pushes the moving guide rod or the moving contact to move, so that the moving contact and the static contact are forced to break away from conductive contact to open the gate, and after the moving contact and the static contact are broken away from conductive contact, the first piston pushes the melt cut-off piece to disconnect the melt.

4. The integrated contactor with excitation function according to claim 1, characterized in that: One end of the moving auxiliary contact is conductively connected to one of the static contacts, one end of the static auxiliary contact is conductively connected to one end of the melt, or one end of the static auxiliary contact is conductively connected to one of the static contacts, one end of the moving auxiliary contact is conductively connected to one end of the melt, and the other end of the melt is conductively connected to another static contact. The moving auxiliary contact and the static auxiliary contact are offset and arranged on the displacement path of the first piston with an insulation distance therebetween. When the moving auxiliary contact is driven by the first piston, the moving auxiliary contact is displaced toward the static auxiliary contact and conductively contacts therewith, so that the melt is connected to the main circuit in parallel.

5. The integrated contactor with excitation function according to claim 4, characterized in that: The movable auxiliary contact and the static auxiliary contact are in conductive contact in a flat plate manner, in conductive contact in an interference insertion manner, or in conductive contact in a stamping deformation insertion manner.

6. The integrated contactor with excitation function according to claim 5, characterized in that: When conducting contact in a flat plate manner, the movable auxiliary contact and the static auxiliary contact are both flat plate structures. When conducting contact is made, the two opposite surfaces of the movable auxiliary contact and the static auxiliary contact are in conducting contact; When the contact is made by interference insertion, the movable auxiliary contact is a columnar structure, and the position of the static auxiliary contact corresponding to the columnar structure is set as a hollow structure or a hollow structure. When they are in conductive contact, the columnar structure of the movable auxiliary contact is inserted into the hollow structure of the static auxiliary contact, or penetrates and is inserted into the hollow structure of the static auxiliary contact, so that the static auxiliary contact is in conductive contact by interference insertion. When the movable auxiliary contact is in contact by means of stamping deformation and insertion for conductive contact, the movable auxiliary contact is a flat plate structure, and the static auxiliary contact is a hollow structure. The first piston drives the movable auxiliary contact to enter the hollow structure of the static auxiliary contact in a deformed state, and makes conductive contact with the static auxiliary contact. At the same time, the impact end of the first piston passes through the hollow structure of the static auxiliary contact, and drives the fuse cut-off piece to disconnect the melt.

7. The integrated contactor with excitation function according to claim 6, characterized in that: When the movable auxiliary contact is a columnar structure, a spike structure is provided on the outer peripheral surface of the columnar structure.

8. The integrated contactor with excitation function according to claim 6, characterized in that: When the movable auxiliary contact is a columnar structure, the movable auxiliary contact is protrudingly arranged on the impact end surface of the first piston.

9. The integrated contactor with excitation function according to claim 6, characterized in that: The static auxiliary contact and the dynamic auxiliary contact are respectively connected to the static contact and the fuse through flexible connecting wires.

10. The integrated contactor with excitation function according to any one of claims 2 or 3, characterized in that: It also includes a melt shell and a melt cover plate covering the melt shell, wherein a displacement channel is provided on the melt shell and the melt cover plate at positions corresponding to the melt cut-off piece, an arc extinguishing medium is filled between the melt shell and the melt cover plate outside the displacement channel, and the melt passes through the arc extinguishing medium and the displacement channel; The melt cut-off piece is integrally connected to the melt cover plate at the displacement channel; when the first piston is driven to displace, the movable auxiliary contact and the static auxiliary contact are first brought into conductive contact, and then continue to displace to disconnect the melt cut-off piece from the melt cover plate, and drive the melt cut-off piece to displace along the displacement channel to disconnect the melt.

11. The integrated contactor with excitation function according to claim 10, characterized in that: A first annular protrusion is arranged on the surface of the melt cover plate located at the displacement channel facing the first piston, the static auxiliary contact includes a conductive contact portion, and a limiting edge is arranged at the end of the conductive contact portion, the conductive contact portion of the static auxiliary contact is penetrated in the first protrusion, and the limiting edge is overlapped on the end of the first protrusion; when the first piston is displaced, the dynamic auxiliary contact is driven to enter the first protrusion in a stamping deformation manner, and after conductive contact with the static auxiliary contact; the impact end of the first piston passes through the first protrusion to drive the melt cut-off piece to be disconnected from the melt cover plate.

12. The integrated contactor with excitation function according to claim 10, characterized in that: The drive system and the contact system are integrated in the contactor housing, and the terminal of the static contact is located outside the contactor housing; the melt cover plate, the melt housing, the melt, the auxiliary contact system, and the first piston are integrated in the excitation housing, and the excitation housing is fixedly connected to the outside of the contactor housing in a detachable manner. After the two free ends of the auxiliary contact system and the melt connected in series extend out of the excitation housing respectively, they are conductively connected to the terminal of the static contact outside the contactor housing in a detachable manner; the excitation housing is filled with an inert gas.

13. The integrated contactor with excitation function according to claim 1, characterized in that: The drive system and the contact system are respectively located in two adjacent and insulated chambers, and the integrated contactor is filled with an inert gas for arc extinguishing.

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