Active and passive integrated fuse

Abstract

The active and passive integrated fuse comprises a shell, a first conducting bar, a melt and a second conducting bar, the first conducting bar, the melt and the second conducting bar penetrate through the shell and are sequentially connected in series, the melt is located in the shell, one end of the first conducting bar and one end of the second conducting bar are located outside the shell, and the other end of the first conducting bar and the other end of the second conducting bar are located in the shell; an electronic ignition device, a piston, arc striking structures and arc extinguishing structures are arranged in the shell, the piston corresponds to the melt, the arc striking structures are arranged on the sides, away from the initial position of the piston, of the first conducting bar and the second conducting bar respectively and located on the two sides of the displacement path of the piston, and the arc extinguishing structures are arranged in the arc striking directions of the arc striking structures. When fault current exists, the melt is fused, or when the electronic ignition device receives a trigger signal to act, the piston is driven to cut off the melt; and an electric arc generated when the melt is disconnected is led to the arc extinguishing structure through the arc striking structure for arc extinguishing. A traditional fuse is integrated in the excitation fuse, the product size is reduced, and active and passive protection is achieved at the same time.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of fuse, in particular to a kind of active and passive integrated fuse. BACKGROUND

[0002] Fuse is used for circuit protection, including traditional fuse and incentive fuse on the market at present.Incentive fuse generally includes electronic ignition device (gas generating device), piston, conducting row, through electronic ignition device receives trigger signal action, releases high-pressure gas as driving force, drives piston displacement, through the kinetic energy of piston cuts off conducting row, thereby disconnects the circuit where incentive fuse is located, realizes the active protection of circuit.The traditional fuse generally includes shell, fuse body, arc extinguishing medium, when fault current appears in circuit, fuse body temperature rises and fuses, disconnects the circuit where fuse body is located, realizes the passive protection of circuit.

[0003] The integrated characteristics of traditional fuse and incentive fuse on the market at present form active and passive integrated fuse.The main structure of which makes the fuse body of traditional fuse and the conducting row of incentive fuse in series, so that the fuse body of traditional fuse acts as signal fuse body, when fault current appears in circuit, traditional fuse fuses passively, disconnects the circuit, thereby realizes the passive protection of circuit, at the same time, electronic ignition device can also receive external trigger signal, sends trigger signal according to set trigger condition, makes electronic ignition device act, thereby cuts off conducting row, disconnects the circuit, realizes the active protection of circuit.

[0004] But the current is to use the simple series connection mode of traditional fuse and incentive fuse, which is relatively large in size, and is difficult to apply in a narrow space. SUMMARY

[0005] The present application integrates traditional fuse and incentive fuse, makes traditional fuse become part of incentive fuse, reduces product size, thereby realizes the active and passive protection of circuit.

[0006] In order to achieve the above object, the technical scheme provided by the application is a kind of active and passive integrated fuse, including shell, first conductive row and second conductive row are arranged in the shell, the first conductive row and the second conductive row are respectively used as the connection end of the active and passive integrated fuse at one end outside the shell, the first conductive row and the second conductive row are connected in series with the fuse at one end in the shell, forming the circuit that the first conductive row, the fuse and the second conductive row are connected in series; Electronic ignition device, piston, arc striking structure and arc extinguishing structure are arranged in the shell, the piston is arranged corresponding to the fuse, the chamber where the driving force release end of the electronic ignition device is located is communicated with the chamber where the one end of the piston away from the fuse is located; The arc striking structure is respectively electrically connected to the arc striking structure on the side of the first conductive row and the second conductive row away from the electronic ignition device, and is located on both sides of the displacement path of the piston; The arc striking structure strikes arc towards the direction away from the first conductive row and the second conductive row, and the arc extinguishing structure is arranged in the arc striking direction of the arc striking structure; When the circuit has fault current, the fuse is fused, or when the electronic ignition device receives the trigger signal and acts, releases high pressure gas, drives the piston to displace and cuts off the fuse; The arc generated when the fuse is disconnected is led to the arc extinguishing structure by the arc striking structure.

[0007] Preferably, the fuse is in an arc-shaped structure or a trapezoidal structure on the side of the first conductive row and the second conductive row away from the electronic ignition device, and the fuse is located between the arc striking structures.

[0008] Preferably, the distance between the arc striking structures located at the first conductive row and the second conductive row gradually increases along the displacement of the piston.

[0009] Preferably, the arc striking structure is an arc striking plate, and at least one side of the arc striking plate towards the displacement path of the piston is provided as an inclined surface structure or an arc surface structure.

[0010] Preferably, the arc extinguishing structure is a metal wire mesh structure or an arc extinguishing fuse structure, when the arc extinguishing structure is an arc extinguishing fuse structure, it includes an arc extinguishing shell, the arc extinguishing shell is filled with arc extinguishing medium, the arc extinguishing fuse is arranged in the arc extinguishing medium, the conductive column is electrically connected to both ends of the arc extinguishing fuse, the other end of the conductive column passes through the arc extinguishing shell and is located outside the arc extinguishing fuse structure, and is located at the arc striking direction of the arc striking structure at a certain distance, the arc striking structure can lead the arc generated when the fuse is disconnected to the conductive column, and the arc makes the arc extinguishing fuse of the arc extinguishing fuse structure fuse.

[0011] Preferably, when the arc extinguishing structure is a wire mesh structure, a limiting protrusion is arranged in the shell at a position corresponding to the front position of the displacement path of the impact end of the piston, and the wire mesh structure is arranged in the cavity of the shell on both sides of the limiting protrusion, when the piston is displaced to the terminal position, the impact end of the piston passes between the first and second conductive rows and contacts the limiting protrusion, two independent cavities are formed between the shell, the first and second conductive rows, the piston and the limiting protrusion, and the arc striking structure and the wire mesh structure are arranged in each independent cavity.

[0012] Preferably, when the arc extinguishing structure is an arc extinguishing fuse structure, a limiting protrusion is arranged at the end of the arc extinguishing fuse facing the fuse body, and the conductive column is arranged on both sides of the limiting protrusion, when the piston is displaced to the terminal position, the impact end of the piston passes between the first and second conductive rows and contacts the limiting protrusion, two independent cavities are formed between the shell, the first and second conductive rows, the piston, the arc extinguishing fuse structure and the limiting protrusion, and the arc striking structure and the conductive column are arranged in each independent cavity.

[0013] Preferably, a wire mesh structure is arranged on the outer periphery of the conductive column outside the arc extinguishing fuse structure.

[0014] Preferably, the electronic ignition device further comprises a conductive wire and an energy storage element, support structures are arranged on both sides of the piston, the conductive wire is arranged in a noose structure around the end of the piston away from the fuse body and the arc striking structure and around the outer periphery of the support structure to support the piston, the part of the conductive wire passing through the arc striking structure is located on the displacement path of the piston, the energy storage element is located in the shell and abuts against the end of the piston away from the fuse body in an energy storage state, the conductive wire cooperates with the energy storage element to limit the initial position of the piston, when the circuit has a fault current, the fuse is fused, the arc striking structure strikes an arc, the conductive wire generates heat to reduce mechanical strength, the support and limitation of the piston are released, the energy storage element releases energy to drive the piston to be located between the first and second conductive rows, or the electronic ignition device acts according to the received trigger signal to drive the piston to overcome the limitation of the conductive wire and break the fuse.

[0015] Preferably, the energy storage element is a tension spring or a torsion spring, and the energy storage state of the energy storage element is a compressed state or a stretched state.

[0016] Preferably, one end of the energy storage element is connected to the end of the piston away from the fuse body, and the other end is connected to the shell or the conductive row.

[0017] Preferably, the shell comprises a first shell, a second shell and a third shell spliced in sequence, the first conductive row, the fuse body, the second conductive row, the arc leading structure, the support structure and the second shell form an integrated structure, the electronic ignition device and the piston are located in the first shell, and the arc leading structure and the arc extinguishing structure are located in the third shell.

[0018] The active-passive integrated fuse of the application reduces the product volume by integrating the traditional fuse in the excitation fuse. The arc leading structure and the arc extinguishing structure are arranged, the arc leading structure leads the electric arc to the arc extinguishing structure to extinguish the arc, and the arc is far away from the fuse breaking point.

[0019] The arc-shaped fuse body is arranged on the side away from the initial position of the piston and between the first conductive row and the second conductive row, which helps the arc after the fuse breaking to be directly led to the arc extinguishing structure by the arc leading structure. If the fuse body is arranged between the first conductive row and the second conductive row or close to the initial position of the piston, the arc leading and extinguishing effect is better.

[0020] The conductive wire and the energy storage element are arranged to support and limit the piston. When the fuse body is broken, the conductive wire is broken due to the temperature rise and the reduction of the mechanical strength, such as softening or breaking of the conductive wire. Under the driving of the energy storage element, the piston is driven to displace into the first conductive row and the second conductive row, and the first conductive row and the second conductive row are insulated by the piston, thereby improving the insulation performance after the fuse breaking.

[0021] When the conductive wire (metal wire or carbon fiber) is broken before the fuse body breaking, the breaking point of the conductive wire is generally between the two arc leading structures, and the distance between the breaking points is increasing, so that the distance between the two ends of the conductive wire after breaking is closer and closer to the arc leading structure, and the arc generated by the breaking of the conductive wire is more easily led to the arc extinguishing structure by the arc leading structure, which is more conducive to the extinction of the arc.

[0022] The arc extinguishing structure adopts the fuse body structure to extinguish the arc. Since the fuse body structure has breaking capacity and can consume a large amount of energy, the overall breaking capacity and arc extinguishing capacity of the product can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structure diagram of the application without the conductive wire.

[0024] Figure 2 is a structure diagram of the application with the conductive wire before the fuse body breaking.

[0025] Figure 3 is a structure diagram of the application with the conductive wire after the fuse body breaking. Figure 2 is a B-B cross-sectional structure diagram of the application.

[0026] Figure 4This is a schematic diagram of a structure where the melt melts and the piston is displaced under the action of the energy storage element.

[0027] Figure 5 yes Figure 4 Schematic diagram of the BB cross-section structure.

[0028] Figure 6 yes Figure 2 A schematic diagram of the explosion structure.

[0029] Figure 7 It is a schematic diagram of a structure with a conductive wire, an arc-extinguishing structure that is a fuse, and a molten element that has not melted.

[0030] Figure 8 yes Figure 7 A schematic diagram of the structure after the melt is broken.

[0031] Figure label:

[0032] First housing 1, second housing 2, third housing 3, limiting protrusion 31, first conductive busbar 4, second conductive busbar 5, molten material 6, piston 7, electronic ignition device 8, arc ignition structure 9, metal wire mesh structure 10, arc extinguishing fuse structure 11, arc extinguishing fuse 111, conductive column 112, conductive wire 12, energy storage element 13, support structure 14. Detailed Implementation

[0033] The active-passive integrated fuse of the present invention includes a housing, in which a first conductive bus and a second conductive bus are disposed. The ends of the first and second conductive buses located outside the housing serve as the connection ends of the active-passive integrated fuse, respectively. A fusible element is connected in series between the ends of the first and second conductive buses located inside the housing, forming a circuit in which the first conductive bus, the fusible element, and the second conductive bus are connected in series. An electronic ignition device, a piston, an arc-starting structure, and an arc-extinguishing structure are disposed in the housing. The piston is disposed corresponding to the fusible element. The chamber where the driving force release end of the electronic ignition device is located is connected to the chamber where the piston is located away from the fusible element. The arc-starting structure is electrically connected to the side of the first and second conductive buses away from the electronic ignition device, respectively, and is located on both sides of the piston displacement path. The arc-starting structure ignites an arc away from the first and second conductive buses, and an arc-extinguishing structure is disposed in the arc-starting direction of the arc-starting structure. When a fault current flows through the circuit, the fusible element melts; or, when the electronic ignition device receives a trigger signal and acts, it releases high-pressure gas, driving the piston to move and cut off the fusible element. The electric arc generated when the fusible element breaks is led to the arc-extinguishing structure by the arc-starting structure and extinguished.

[0034] The conductive wire can be added on the basis of the above structure, and the energy storage element is arranged in an energy storage state. When the conductive wire is melted, the temperature rises, the conductive wire is softened or melted, the mechanical strength of the conductive wire is reduced, and then the energy storage element pushes the piston to move, so that the piston is located between the first conductive row and the second conductive row, and the insulation performance after the melt is broken is improved.

[0035] The energy storage element is preferably a tension spring or a torsion spring, and the energy storage state is a tension state or a compression state.

[0036] The conductive wire is made of metal or carbon fiber. The resistance value of the conductive wire is much larger than the resistance value of the melt.

[0037] The electronic ignition device is a gas generating device, and can release high-pressure gas as driving force.

[0038] The preferred embodiments are described below in detail in combination with the drawings. The orientation words involved only refer to the orientation shown in the drawings, and do not constitute a limitation on the technical scheme of the present application.

[0039] The active and passive integrated fuse of the present application is shown in Figure 1 , mainly comprising a shell, a conductive row, a melt 6, a piston 7, an electronic ignition device 8, an arc striking structure 9 and an arc extinguishing structure. Among them:

[0040] The shell mainly comprises a first shell 1 having a cavity, a second shell 2 and a third shell 3. The first shell 1, the second shell 2 and the third shell 3 are sequentially spliced to form a sealed shell, and a cavity is formed in the shell. The second shell 2 has a through cavity, and the first shell 1 and the third shell 3 each have a cavity opening towards the second shell 2.

[0041] The piston 7 and the electronic ignition device 8 are arranged in the first shell 1, the first conductive row 4, the second conductive row 5, the melt 6 and the arc striking structure are arranged in the second shell 2, and the arc extinguishing structure 10 is arranged in the third shell 3.

[0042] The electronic ignition device 8 is arranged at one end of the first shell 1 away from the opening of the cavity, and the signal receiving end of the electronic ignition device 8 is located outside the first shell 1 and can receive the trigger signal of the external sending end. The high-pressure gas release end of the electronic ignition device is located in the cavity of the first shell 1. The impact end of the piston 7 is arranged towards the second shell 2, and the end of the piston 7 towards the electronic ignition device is in sealing contact with the inner wall of the cavity of the first shell 1, preventing the high-pressure gas released by the electronic ignition device from entering between the piston 7 and the first and second conductive rows, thereby hindering the displacement of the piston 7. The initial position of the piston 7 is limited by a limiting structure, such as a notch arranged in the cavity of the first shell 1 and a limiting protrusion arranged on the outer circumferential surface of the piston 7. The limiting protrusion of the piston 7 is clamped in the notch of the first shell to limit the position. For example, the notch is arranged at the end face of the joint end of the first shell 1 and the second shell 2. Through shell assembly, the limiting structure forms a position limitation for the piston 7. Other structures can also be used to limit the initial position of the piston 7.

[0043] The conductive rows include the first conductive row 4 and the second conductive row 5, which are respectively arranged in the second shell 2. One end of the first conductive row 4 and the second conductive row 5 located outside the second shell 2 serves as the connection end of the main and passive integrated fuse. The other end of the first conductive row 4 and the second conductive row 5 located inside the second shell 2 is relatively spaced and insulated. The other end of the first conductive row 4 and the second conductive row 5 located inside the second shell 2 is in series with the fuse 6 to form a series circuit, and the impact end of the piston 7 corresponds to the fuse 6. Preferably, the fuse 6 is arranged on one side of the first conductive row 4 and the second conductive row 5 in the displacement direction of the piston and away from the initial position of the piston 7. Preferably, the fuse 6 is arranged in an arc shape protruding towards the third shell 3, and a narrow neck is arranged on the fuse 6. In other embodiments, the fuse 6 can also be arranged in a trapezoidal structure protruding towards the third shell 3. The purpose of the arc-shaped or trapezoidal fuse 6 is to facilitate the displacement of the fuse 6 towards the arc guiding structure 9 after the fuse 6 is broken, so that the electric arc of the product is more easily guided by the arc guiding structure 9.

[0044] The arc guiding structure 9 is electrically connected to the first conductive row 4 and the second conductive row 5 on the side away from the electronic ignition device, i.e., the arc guiding structure 9 is located on both sides of the displacement path of the piston 7 and does not hinder the displacement of the piston 7. One end of the arc guiding structure 9 towards the third shell 3 protrudes into the third shell 3. The arc guiding structure 9 is made of a conductive material and is electrically connected to the first conductive row 4 and the second conductive row 5, facilitating arc guiding. The distance between the arc guiding structures 9 on the first conductive row 4 and the second conductive row 5 gradually increases along the displacement direction of the piston 7.

[0045] Preferably, the arc striking structure 9 is an arc striking plate, and the arc striking plate 9 is provided with a slope structure or an arc surface structure on the side facing the displacement path of the piston 7, which is inclined in the direction away from the displacement path of the piston 7 along the displacement direction of the piston 7, that is, along the displacement direction of the piston 7, the spacing between the arc striking structure 9 on the first conductive row 4 and the second conductive row 5 gradually increases.

[0046] When the melt 6 is broken, the broken melt 6 is in contact with the arc striking plates 9 on both sides respectively, and the electric arc generated by the breaking of the melt 6 moves in the direction from the conductive row to the arc extinguishing structure in the third housing 3 under the impact of the piston 7, and breaks through the air between the arc striking plate 9 and the arc extinguishing structure and enters the arc extinguishing structure to be extinguished.

[0047] The second housing 3, the first conductive row 4, the second conductive row 5, the melt 6 and the arc striking structure 9 can be independent parts or an integrated structure, for example, the second housing 2, the first conductive row 4, the second conductive row 5 and the arc striking structure 9 are integrally formed by injection molding, and the melt can be conductively connected with the first conductive row and the second conductive row before or after the integrated forming.

[0048] The arc extinguishing structure is located in the third housing 3. The arc extinguishing structure can be a wire mesh structure 10 or a fuse structure 11 for arc extinguishing. Referring to Figure 1 , the arc extinguishing structure is a wire mesh structure 10, when it is a wire mesh structure 10, the third housing 3 is divided into two independent cavities by a limiting protrusion 31, and a wire mesh structure 10 is arranged in each independent cavity as an arc extinguishing structure. The limiting protrusion 31 is arranged corresponding to the impact end of the piston 7, when the piston 7 is displaced to the terminal position, the impact end surface of the piston 7 is in contact with the limiting protrusion 31, and two closed cavities are formed by the conductive row, the piston, the second housing, the third housing and the limiting protrusion, each closed cavity includes an arc striking structure and an arc extinguishing structure, which prevents the electric arc on the two arc striking structures on both sides of the melt from arc jumping after the melt is broken, and improves the insulation performance.

[0049] Figure 1 Working principle:

[0050] When working normally, the current flows through the circuit formed by the first conductive row 4, the melt 6 and the second conductive row 5 in series.

[0051] When there is a fault current in the circuit, the melt 6 is broken, and the electric arc generated by the breaking of the melt 6 is guided by the arc striking structure 9 and enters the arc extinguishing structure to be extinguished.

[0052] When the electronic ignition device 8 receives the trigger signal sent from outside, it releases high-pressure gas as driving force to drive the piston 7 to move. The piston 7 enters between the first conductive row 4 and the second conductive row 5, cuts off the fuse 6, and the impact end of the piston 7 contacts the limiting protrusion 31 of the third shell 3. The electric arc generated after the fuse 6 is cut off is guided to the arc extinguishing structure through the arc guiding structure 9 and is extinguished in the arc extinguishing structure.

[0053] In other embodiments, the conductive wire 12 and the energy storage element 13 can also be added to realize the support and limiting of the piston 7. At the same time, the energy storage element 13 drives the piston 7 to move, and the insulation performance after the fuse 6 is cut off is improved.

[0054] On the basis of Figure 1 the conductive wire 12 and the energy storage element 13 are added, and refer to Figures 2 to 6 The support structure 14 is provided on one side of the first conductive row 4 and the second conductive row 5, is integrally connected with the second shell 2, and is located on the opposite sides of the piston 7 and the outer side of the arc guiding structure 9 away from the displacement path direction of the piston 7. Preferably, the support structure 14 is a columnar structure, and the two ends of the support structure 14 are located on the opposite sides of the first conductive row 4 and the second conductive row 5 in the displacement direction of the piston 7. A stepped surface structure wound by the conductive wire 12 is provided on the outer circumferential surface of the side of the support structure 14 in contact with the first conductive row 4 and the second conductive row 5. The end of the support structure 14 facing the first shell 1 protrudes from the end of the piston 7 facing the electronic ignition device 8.

[0055] The accommodating groove for inserting the support structure 14 is provided at the position of the first shell 1 corresponding to the support structure 14, and the end of the support structure 14 facing the first shell 1 is inserted into the accommodating groove to form a sealed contact, leaving only the stepped surface structure for the conductive wire 12 to wind around. The support structure 14 is in sealed contact with the piston 7. The through holes for the conductive wire 12 to pass through are respectively provided on the piston 7 and the arc guiding structure 9 at the position of the stepped surface structure corresponding to the support structure 14. One end of the conductive wire 12 passes through the through holes provided on the piston 7 and the arc guiding structure 9 and is wound on the stepped surface structure on the support structure 14, and the other end of the conductive wire 12 is connected and fixed to form a noose structure, thereby supporting the piston 7. When the fuse 6 is cut off, the electric arc is guided by the arc guiding structure 9, the electric arc makes the conductive wire 12 passing through the arc guiding structure quickly increase in temperature, soften and cut off, thereby reducing the mechanical strength, and cooperating with the energy storage element 13 to quickly release the initial position limitation of the piston 7.

[0056] The energy storage element 13 is in a storage state in the initial state. The energy storage element 3 is preferably a tension spring or a torsion spring. Taking the tension spring as an example, the energy storage element 3 is arranged in the following manner: one end of the energy storage element 3 is connected to the end of the piston 7 away from the fuse, and the other end is connected to the first housing 1, so that the energy storage element 3 is in a compressed state as the storage state, or the other end is connected to the third housing 3, so that the energy storage element 3 is in a stretched state as the storage state. Referring to Figures 2 to 8 The first housing 1 and the piston 7 are respectively provided with accommodating grooves at corresponding positions, and the two ends of the energy storage element 3 are respectively arranged in the accommodating grooves of the piston 7 and the first housing 1. In the initial position, the energy storage element 3 is in a compressed state by the restraint of the conductive wire 12. When the conductive wire 12 is arranged, the piston 7 can not be provided with a limiting structure to limit the initial position. The conductive wire 12 cooperates with the energy storage element 13 to achieve the support of the piston 7 and the limitation of the initial position. When the mechanical strength of the conductive wire 12 is reduced due to the increase in temperature, the piston 7 is driven by the elastic force of the energy storage element 13 to displace.

[0057] Figures 2 to 6 In the above embodiment, the arc extinguishing structure 9 is a metal wire mesh structure.

[0058] Figures 2 to 6 Working principle:

[0059] In normal operation, the current flows through the circuit formed by the first conductive row 4, the fuse 6 and the second conductive row 5 in series.

[0060] When a fault current flows in the circuit, the fuse 6 is melted, and the arc generated by the melting of the fuse 6 is guided into the arc extinguishing structure by the arc guiding structure 9 and is extinguished in the arc extinguishing structure. At the same time, the conductive wire 12 is softened or melted due to the increase in temperature, and the mechanical strength is reduced. The piston 7 is driven by the elastic force of the energy storage element 13 to displace. When the conductive wire 12 is not melted, the displacement of the piston 7 first causes the conductive wire 12 to be disconnected, and then the impact end of the piston 7 penetrates through the limiting protrusion 31 of the third housing 3 between the first conductive row 4 and the second conductive row 5 to contact, thereby isolating the first conductive row 4 and the second conductive row 5 and improving the insulation performance of the main and passive integrated fuse after the fuse is disconnected.

[0061] When the electronic ignition device 8 receives the trigger signal sent from the outside and acts, high-pressure gas is released as driving force. Since the impact force of the high-pressure gas is much greater than the restraint force of the conductive wire 12, the high-pressure gas drives the piston 7 to displace, first causing the conductive wire 12 to be disconnected, and then the impact end of the piston 7 penetrates through the first conductive row 4 and the second conductive row 5 to cut off the fuse 6. After that, the impact end of the piston 7 contacts the limiting protrusion 31 of the third housing 3. The arc generated after the fuse 6 is disconnected is guided to the metal wire mesh junction 10 by the arc guiding structure 9 and is extinguished in the metal wire mesh junction 10.

[0062] In the above embodiment, the arc extinguishing structure is a metal wire mesh structure 10. Referring toFigures 7 to 8 The arc extinguishing structure can also be an arc extinguishing fuse structure 11. The arc extinguishing fuse structure 11 is arranged in the third housing 3 and mainly comprises an arc extinguishing housing, an arc extinguishing medium filled in the arc extinguishing housing, and an arc extinguishing fuse 111 arranged in the arc extinguishing medium. Two ends of the arc extinguishing fuse 111 are respectively electrically connected with a conductive column 112, and the other end of the conductive column 112 respectively extends out of the arc extinguishing housing towards the corresponding arc striking structure 9 towards the extending direction of the one end of the third housing 3, so as to ensure that the electric arc is directly led to the conductive column 112 along the extending direction of the inclined surface structure of the arc striking plate 9 when the arc striking plate 9 strikes the arc. The arc striking structure 9 at the first conductive row 4 and the second conductive row 5 respectively corresponds to one conductive column 112, and a gap is reserved between the conductive column 112 and the arc striking structure 9. The limiting protruding rib 31 is arranged on the arc extinguishing housing of the arc extinguishing fuse structure between the two conductive columns 112 at the position corresponding to the impact end of the piston 7.

[0063] Figure 7 And Figure 8 The working principle of the arc extinguishing structure is different from that of the arc extinguishing structure of the prior art. When the arc is extinguished, the electric arc is led to the conductive column 112 through the arc striking structure 9, and the electric arc flows through the arc extinguishing fuse 111, so that the temperature of the arc extinguishing fuse 111 rapidly rises and is fused, a large amount of arc energy is consumed, and at the same time, the arc extinguishing medium participates in the arc extinguishing. Since the arc extinguishing fuse structure 11 has a breaking capacity, the large current breaking capacity of the active and passive integrated fuse is improved.

[0064] At the same time, the impact end of the piston 7 is in contact with the limiting protruding rib 31, so that the arc striking plate 9 at the first conductive row 4 and the corresponding conductive column 112 and the arc striking plate 9 at the second conductive row 5 and the corresponding conductive column 112 are isolated in different independent cavities, so as to prevent arc jumping and further improve the insulation performance.

Claims

1. A combination self and auxiliary fuse, characterized in that, The application relates to a main-passive integrated fuse, which comprises a shell, a first conductive row and a second conductive row are arranged in the shell, the first conductive row and the second conductive row are respectively used as connecting ends of the main-passive integrated fuse at one end outside the shell, a fuse body is arranged between one end of the first conductive row and the second conductive row in the shell, and the first conductive row, the fuse body and the second conductive row are sequentially connected in series to form an electric circuit; an electronic ignition device, a piston, an arc striking structure and an arc extinguishing structure are arranged in the shell, the piston is arranged corresponding to the fuse body, a chamber, in which a driving force releasing end of the electronic ignition device is located, is communicated with a chamber, in which one end of the piston, which is far away from the fuse body, is located; the arc striking structure is respectively arranged on the side, which is far away from the electronic ignition device, of the first conductive row and the second conductive row, and is located on the two sides of the displacement path of the piston; the arc striking structure strikes an arc in the direction, which is far away from the first conductive row and the second conductive row; the arc extinguishing structure is arranged in the arc striking direction of the arc striking structure; when a fault current flows through the electric circuit, the fuse body is fused, or when the electronic ignition device receives a trigger signal and releases high-pressure gas to drive the piston to displace and cut off the fuse body; the arc generated when the fuse body is cut off is led to the arc extinguishing structure by the arc striking structure and is extinguished.

2. The integrated fuse of claim 1, wherein, The fuse body is in an arc structure or a trapezoidal structure and is located on the side, which is far away from the electronic ignition device, of the first conductive row and the second conductive row, and the fuse body is located between the arc striking structures.

3. The integrated fuse of claim 1, wherein, The distance between the arc striking structures arranged on the first conductive row and the second conductive row gradually increases along the displacement path of the piston.

4. The integrated fuse of claim 3, wherein, The arc striking structure is an arc striking plate, and at least one side of the arc striking plate, which faces the displacement path of the piston, is provided with a slope structure or an arc surface structure.

5. The integrated fuse of claim 1, wherein, The arc extinguishing structure is a metal wire mesh structure or an arc extinguishing fuse body structure, when the arc extinguishing structure is the arc extinguishing fuse body structure, an arc extinguishing shell is arranged, arc extinguishing medium is filled in the arc extinguishing shell, an arc extinguishing fuse body is arranged in the arc extinguishing medium, conductive columns are respectively arranged at the two ends of the arc extinguishing fuse body, the other ends of the conductive columns pass through the arc extinguishing shell and are located outside the arc extinguishing fuse body structure, and the conductive columns are located at a certain distance in the arc striking direction of the arc striking structure, the arc striking structure can lead the arc generated when the fuse body is cut off to the conductive columns, and the arc makes the arc extinguishing fuse body of the arc extinguishing fuse body structure fuse.

6. The integrated fuse of claim 5, wherein, When the arc extinguishing structure is the metal wire mesh structure, a limiting convex rib is arranged in the shell corresponding to the front position of the impact end displacement path of the piston, the metal wire mesh structures are respectively arranged in the cavities in the shell on the two sides of the limiting convex rib, when the piston is displaced to the terminal position, the impact end of the piston passes through the first conductive row and the second conductive row and contacts the limiting convex rib, two independent cavities are formed between the shell, the first conductive row, the second conductive row, the piston and the limiting convex rib, and the arc striking structure and the metal wire mesh structure are respectively arranged in each independent cavity.

7. The integrated fuse of claim 5, wherein, When the arc extinguishing structure is an arc extinguishing fuse structure, a limiting convex ridge is arranged at one end of the arc extinguishing fuse structure facing the fuse body, and the conductive columns are respectively arranged on both sides of the limiting convex ridge. When the piston is displaced to the terminal position, the impact end of the piston is in contact with the limiting convex ridge after passing between the first and second conductive rows. Two independent cavities are formed between the shell, the first conductive row, the second conductive row, the piston, the arc extinguishing fuse structure and the limiting convex ridge, and the arc striking structure and the conductive column are respectively arranged in each independent cavity.

8. The integrated fuse of claim 6, wherein, The periphery of the conductive column outside the arc extinguishing fuse structure is provided with a wire mesh structure.

9. The integrated fuse of any one of claims 1 to 7, wherein, The conductive wire and the energy storage element are further included. Support structures are respectively arranged on the opposite sides of the piston. The conductive wire is arranged in a noose structure passing through the end of the piston away from the fuse body and the arc striking structure, and around the periphery of the support structure to support the piston. The part of the conductive wire passing through the arc striking structure is located on the displacement path of the piston. The energy storage element is located in the shell to abut the end of the piston away from the fuse body in an energy storage state. The conductive wire cooperates with the energy storage element to limit the initial position of the piston. When the circuit has a fault current, the fuse is fused, the arc striking structure strikes an arc, the conductive wire generates heat to reduce mechanical strength, and the support and limitation of the piston are released. The energy storage element releases energy to drive the piston to be located between the first and second conductive rows. Alternatively, the electronic ignition device acts according to the received trigger signal to drive the piston to overcome the limitation of the conductive wire and break the fuse.

10. The integrated fuse of claim 9, wherein, The energy storage element is a tension spring or a torsion spring, and the energy storage state of the energy storage element is a compressed state or a stretched state.

11. The hybrid fuse according to claim 9, wherein One end of the energy storage element is connected to the end of the piston away from the fuse body, and the other end is connected to the shell or the conductive row.

12. The integrated fuse of claim 9, wherein, The shell includes a first shell, a second shell and a third shell which are sequentially spliced. The first conductive row, the fuse body, the second conductive row, the arc striking structure, the support structure and the second shell form an integrated structure. The electronic ignition device and the piston are located in the first shell, and the arc striking structure and the arc extinguishing structure are located in the third shell.

Images