Tubular excitation fuse

Abstract

The invention relates to the field of circuit protection, in particular to a tubular excitation fuse which comprises a shell, a wiring terminal, an insulating bush, an excitation source, an insulating first piston and a tubular conductor assembly. The two ends of the conductor assembly are conductively and fixedly connected with the wiring terminals respectively. The wiring terminals are located at the two ends of the shell and fixedly connected with the shell. The insulating bush is located in the shell and sleeves the periphery of the conductor assembly; the conductor assembly is provided with at least three sections of mutually sleeved conductive parts; one section of the conductive piece is provided with a stress part; the driving force release end of the excitation source sequentially penetrates through the shell, the insulating bush and the conductor assembly and is located in the conductor assembly; the first piston is located in the conductor assembly; and under the driving of the driving force released by the excitation source, the first piston drives the conductive piece provided with the stress part to displace, and the conductor assembly is disconnected. The device is compact in structure, small in size and high in current impact resistance, and temperature rise can be greatly reduced.

Description

Technical Field

[0001] The present invention relates to circuit protection in the fields of power control, electric vehicles, energy storage, photovoltaic, etc., and particularly refers to a tubular excitation fuse for circuit protection. Background Art

[0002] Currently, most circuit protection devices excited by excitation fuses or pyrotechnic devices adopt a multi-layer stacked manner. The most common structural form includes a housing, a conductive plate is passed through the housing, an excitation source and a first piston are sequentially arranged on one side of the conductive plate, and a displacement space is provided on the other side of the conductive plate for the conductive plate to disconnect. In order to improve the breaking capacity, an arc extinguishing melt is connected in parallel on the conductive plate. When overload, short circuit or abnormal conditions occur, the excitation source can receive a trigger signal, the excitation source acts according to the received trigger signal, releases a driving force, the driving force drives the first piston to displace, cuts off the conductive plate, and if there is an arc extinguishing melt connected in parallel, cuts off the arc extinguishing melt again.

[0003] The above structural manner mainly stacks various components in the length direction of the product, occupying a large space, so the size is relatively large. Moreover, the excitation source is generally arranged on a housing formed by processing insulating materials. Since the excitation source is a gas generating device, after receiving the trigger signal, it ignites, the gas generating agent explodes, and high-pressure gas is released as the driving force. The huge impact force generated when the excitation source releases high-pressure gas will cause a great impact on the housing, and there is a safety risk of shell cracking or even shell peeling. Therefore, very high requirements are put forward for the strength of the housing. By changing the housing material, increasing the housing thickness, or setting a protective sleeve outside the first piston, etc., the impact resistance of the fuse is improved. However, no matter how it is designed, the housing, protective sleeve, etc. must be made of insulating materials, and their strength is relatively low, and there will still be potential safety hazards. In addition, the volume of this type of product is large, and its installation method is different from that of traditional fuses. Due to the large volume, the miniaturization requirements for specific occasions cannot be met.

[0004] For an excitation fuse with an excitation source, due to the limitations of size and structure, it is very difficult to form a round tube or square tube shape for the product appearance. Summary of the Invention

[0005] The purpose of the present invention is to provide a tubular excitation fuse. By setting the conductor assembly as a tubular structure, the product structure is more compact, the volume is smaller, the strength of the housing is reduced, and the product appearance is closer to the traditional round tube or square tube thermal fuse, adapting to various application occasions, especially the miniaturization requirements for specific occasions.

[0006] To achieve the above purpose, the technical solution provided by the present invention is a tubular excitation fuse, which includes a housing, a terminal, and an insulating bushing, an excitation source, an insulating first piston, and a conductor assembly located in the housing;

[0007] The terminal blocks are fixedly connected to both ends of the outer shell respectively. The conductor assembly and the insulating bushing are both tubular structures. The conductor assembly is arranged in the outer shell, and both ends of the conductor assembly are electrically and fixedly connected to the terminal blocks. The insulating bushing is sleeved on the outer periphery of the conductor assembly;

[0008] The conductor assembly is a tubular structure, including a first conductive member with both ends penetrating. At least two conductive members are electrically connected in series in a sleeved manner at at least one end of the first conductive member. A stress portion is arranged in the radial direction on the inner wall of one of the conductive members between the first conductive member and the conductive member at the end of the conductor assembly. One end of the conductive member provided with the stress portion, which is away from the first conductive member, is sleeved inside or outside the tube wall of the adjacent conductive member. The conductive member provided with the stress portion can be displaced in the direction towards the terminal block under the drive of an external force and is disconnected from the first conductive member in electrical connection;

[0009] The excitation source is fixedly arranged by passing through the outer shell, the insulating bushing and the first conductive member in sequence, and the driving force release end of the excitation source is located in the first conductive member; a first piston is arranged between the driving force release end of the excitation source and the conductive member provided with the stress portion. The first piston is located in the tubular structure of the conductor assembly. One end of the first piston is close to the stress portion, and the other end of the piston communicates with the chamber where the driving force release end of the excitation source is located. The first piston is in sealed contact or small-gap fit with the inner wall of the conductor assembly;

[0010] When the excitation source acts according to the received trigger signal and releases the driving force, the driving force drives the first piston to displace. The first piston abuts against the stress portion and pushes the conductive member provided with the stress portion to displace towards the terminal block side, disconnecting the electrical connection with the first conductive member and disconnecting the conductor assembly.

[0011] Preferably, the conductor assembly includes the first conductive member, and a second conductive member and a third conductive member are sequentially connected in series in a sleeved manner at both ends of the first conductive member; the third conductive member is located at both ends of the conductor assembly and is fixedly connected to the wiring terminals located at both ends of the housing in a conductive manner; one end of the second conductive member is sleeved on the end of the first conductive member, and the other end of the second conductive member is sleeved on the end of the third conductive member. A force-receiving portion is provided in the radial direction of the second conductive member, and the force-receiving portion of the second conductive member is located at one end of the second conductive member; the force-receiving portion is of a fully enclosed or semi-enclosed structure; a displacement space for the displacement of the second conductive member is reserved between the second conductive member and the wiring terminal; a first piston is respectively provided between the driving force release end of the excitation source and the force-receiving portion of the second conductive member, and the first piston is in sealed contact or small-gap fit with the inner wall of the first conductive member; or, a first piston is provided between the driving force release end of the excitation source and one end of the force-receiving portion of one of the second conductive members, and the force-receiving portion of the other second conductive member without the first piston is of a fully enclosed structure;

[0012] When the excitation source acts according to the received trigger signal and releases the driving force, the driving force acts on the first piston, or directly acts on the force-receiving portion of the second conductive member without the first piston. The force-receiving portion of the second conductive member displaces along the third conductive member under the drive of the first piston or the direct drive of the driving force, and the second conductive member is disconnected from the first conductive member, disconnecting the conductor assembly, thereby disconnecting the main circuit where the conductor assembly is located.

[0013] Preferably, the insulating bushing is sleeved on the outer peripheries of the first conductive member and the second conductive member, and both ends of the insulating bushing are respectively abutted against one end of the third conductive member close to the first conductive member.

[0014] Preferably, a conductive flange is connected to one end of the third conductive member close to the wiring terminal, and the conductive flange is fixedly connected to the wiring in a conductive manner.

[0015] Preferably, an arc extinguishing device is provided in the housing, and the arc extinguishing device is located between the insulating bushing and the connection of the first conductive member and the second conductive member.

[0016] Preferably, the arc extinguishing device is an arc extinguishing grid or an arc extinguishing wire mesh, and the arc extinguishing grid or the arc extinguishing wire mesh is provided on the inner wall of the insulating bushing.

[0017] Preferably, a sealing groove is formed in the circumferential direction on the outer periphery of the first piston, and a sealing ring is provided in the sealing groove, and the sealing ring abuts against the inner wall of the first conductive member.

[0018] Preferably, corresponding exhaust holes are provided on the terminal block, and the exhaust holes communicate the inside and outside of the housing. The exhaust holes can discharge the gas dissipated to the terminal block after the disconnection process of the conductor assembly from the housing.

[0019] Preferably, threaded holes for connection are provided on the end face of the terminal block located outside the housing.

[0020] Preferably, when one end of the first conductive member is connected with more than three conductive members in sequence, the connection strength between the conductive member provided with the stress part and the adjacent conductive member is less than the connection strength between other conductive members in the conductor assembly.

[0021] Preferably, the conductive member provided with the stress part and the adjacent conductive member are connected by an interference fit method, a welding method, or a clamping method.

[0022] Preferably, an arc extinguishing medium is filled between the structure formed by the housing and the terminal block and outside the structure formed by the conductor assembly and the insulating bushing sleeved on the outer periphery of the conductor assembly.

[0023] Preferably, one side of the outer periphery of the insulating bushing is attached to the inner wall of the housing, the excitation source is arranged on the side where the insulating bushing is attached to the housing, and a receiving space is reserved between the other side of the outer periphery of the insulating bushing and the housing;

[0024] At least one guiding cylinder located in the displacement channel is arranged in the receiving space. Both ends of the guiding cylinder are in contact with the outer periphery of the insulating bushing and the inner wall of the housing respectively. A through hole is provided at the position of the insulating bushing corresponding to the guiding cylinder, or a through hole penetrating the insulating bushing and the first conductive member is provided at the positions of the insulating bushing and the first conductive member corresponding to the guiding cylinder. A second piston is arranged in the through hole, and the second piston can enter the displacement channel of the guiding cylinder under the drive of an external force;

[0025] In the initial position, the open end of the through hole is closed by the first piston or the conductive member provided with the stress part, and the closed open end of the through hole is located on the displacement path of the first piston or the conductive member provided with the stress part;

[0026] A melt is electrically connected between the terminal blocks at both ends inside the housing. The melt is located in the receiving space and passes through the guiding cylinder, and the melt is located on the displacement path of the second piston;

[0027] When the displacement of the first piston causes the displacement of the conductive member provided with the force-receiving portion, and the conductive connection with the first conductive member is disengaged to disconnect the conductor assembly, the through hole communicates with the chamber where one end of the driving force released by the excitation source is located and the space where the second piston is located, and the driving force drives the second piston to displace along the displacement channel of the guide cylinder to disconnect the melt.

[0028] Preferably, a limiting rib is provided on the second piston, and a limiting step is provided at the opening of the displacement channel at one end of the guide cylinder close to the second piston; when the limiting rib of the second piston displaces to the limiting step of the guide cylinder, the second piston is in the terminal position.

[0029] The present invention also provides a tubular excitation fuse, including a housing, a terminal, and an insulating bushing, an excitation source, and a conductor assembly located in the housing;

[0030] The terminals are respectively provided at both ends of the housing. The conductor assembly and the insulating bushing are both tubular structures. The conductor assembly is arranged in the housing, and both ends of the conductor assembly are electrically connected or conductively abutted with the terminals respectively. The insulating bushing is sleeved on the outer periphery of the conductor assembly;

[0031] The conductor assembly is a tubular structure, including a first conductive member with both ends penetrating. At least two conductive members are electrically connected in series in a sleeved manner at at least one end of the first conductive member; one end of one of the conductive members between the first conductive member and the conductive member at the end of the conductor assembly is completely closed to form a force-receiving portion;

[0032] The excitation source passes through the housing, the insulating bushing, and the first conductive member in sequence and is fixedly arranged, and the driving force release end of the excitation source is located in the first conductive member; a closed cavity is formed by communicating the chamber where the driving force release end of the excitation source is located with the inside of the conductor provided with the force-receiving portion;

[0033] When the excitation source acts according to the received trigger signal and releases the driving force, the driving force drives the conductive member provided with the force-receiving portion to displace in a direction away from the first conductive member, disengaging the electrical connection with the first conductor and disconnecting the conductor assembly.

[0034] Preferably, the conductor assembly includes the first conductive member, and the second conductive member and the third conductive member are sequentially connected in series in a socketing manner at both ends of the first conductive member; the third conductive member is located at both ends of the conductor assembly and is fixedly connected to the wiring terminals located at both ends of the housing in a conductive manner; one end of the second conductive member is socketed at the end of the first conductive member, and the other end of the second conductive member is completely enclosed and socketed inside the end of the third conductive member, and the enclosed end of the second conductive member forms the force-receiving portion; a displacement space is reserved between the enclosed end of the second conductive member and the wiring terminal adjacent thereto; the chamber where the driving force release end of the excitation source is located communicates with the inside of the second conductive member; when the excitation source acts according to the received trigger signal and releases the driving force, the driving force acts on the force-receiving portion of the second conductive member, driving the second conductive member to displace along the third conductive member, so that the second conductive member is disconnected from the first conductive member in conductive connection, and the conductor assembly is disconnected.

[0035] Preferably, a receiving space is reserved between the insulating bushing and the housing, and the insulating bushing is located on the outer periphery of the first conductive member and the second conductive member;

[0036] At least one through hole is provided at the corresponding positions of the first conductive member and the insulating bushing at the receiving space, and a guiding cylinder with a displacement channel is provided in the receiving space and is docked with the through hole; a second piston is provided in the through hole, and the melt passes through the receiving space between the insulating bushing and the housing and the guiding cylinder and is conductively connected to the wiring terminals located at both ends of the housing; the melt is located on the displacement path of the second piston; when the second conductive member is in the initial position, the second conductive member closes the through hole; when the second conductive member is disconnected from the first conductive member in conductive contact and the conductor assembly is disconnected, the through hole communicates with the chamber where the driving force release end of the excitation source is located, and the driving force drives the second piston to displace along the displacement channel of the guiding cylinder, disconnecting the melt.

[0037] The tubular excitation fuse of the present invention has a round tube or square tube shape and can replace the existing traditional thermal fuse.

[0038] The conductor assembly is connected in parallel with the melt, so that the resistance of the main circuit where the tubular conductor assembly is located is much lower than the resistance of the melt circuit connected in parallel, the temperature rise of the fuse can be greatly reduced, and the ability to withstand current impact is strong. The tubular conductor assembly has a large current-carrying area and strong current-carrying capacity, so that the tubular excitation fuse can be applied to working occasions with large currents. Moreover, the tubular excitation fuse can be installed in the installation manner of a conventional thermal fuse, which is more convenient.

[0039] The conductor assembly through the tubular structure and the driving force release end and the piston arranged in the conductor assembly make full use of the space inside the product, making the product structure more compact and the volume smaller. At the same time, the impact energy brought by the driving force released by the excitation source is buffered by the conductor assembly, improving the safety performance of the product while reducing the mechanical strength of the housing, so that in addition to using the traditional ceramic housing, the housing can also use melamine or plastic materials.

[0040] At the same time, an excitation source that operates according to the received trigger signal is used as active protection to replace the passive protection of the traditional fuse, further improving the reliability of the protection. Brief Description of the Drawings

[0041] Figure 1 It is a schematic diagram of the external structure of the present invention.

[0042] Figure 2 It is a schematic cross-sectional structure diagram when not triggered.

[0043] Figure 3 It is a schematic cross-sectional structure diagram after triggering.

[0044] Figure 4 It is a schematic diagram of the housing structure.

[0045] Figure 5 It is a schematic diagram of the insulating bushing structure.

[0046] Figure 6 It is a schematic diagram of the first conductive member structure.

[0047] Figure 7 It is a schematic diagram of the second conductive member structure.

[0048] Figure 8 It is a schematic diagram of the third conductive member structure.

[0049] Figure 9 It is a schematic diagram of the terminal structure.

[0050] Figure 10 It is a schematic diagram of the first piston structure.

[0051] Figure 11 It is a schematic diagram of the external structure of another embodiment without the first piston.

[0052] Figure 12 It is a schematic diagram of the front view plane structure in the direction of the excitation source.

[0053] Figure 13 It is Figure 12 The A-A cross-sectional structure diagram of, wherein, the closed end of the second conductive member as the force-receiving part is located at one end of the third conductive member, and the open end is sleeved on the outer periphery of the first conductive member.

[0054] Figure 14 Yes Figure 13 On the basis of Figure 14 , the open end of the second conductive member is sleeved on the inner wall of the first conductive member.

[0055] Figure 15 It is a schematic structural diagram of a structure in which the first piston is not provided, and the completely enclosed force-receiving part of the second conductive member is arranged between the two ends of the second conductive member.

[0056] Figure 16 It is a schematic structural diagram of a structure in which the first piston is not provided, wherein the closed end of the second conductive member serving as the force-receiving part is located on the inner wall of one end of the first conductive member, and the open end is sleeved on the inner wall of the third conductive member.

[0057] Figure 17 It is a schematic structural diagram of a structure in which the first piston is not provided, wherein the closed end of the second conductive member serving as the force-receiving part is located on the inner wall of the first conductive member, and the open end is sleeved on the outer periphery of the third conductive member.

[0058] Figure 18 It is a schematic structural diagram of a structure in which the second conductive member is provided with a semi-closed force-receiving part and a first piston.

[0059] Reference numerals:

[0060] Outer shell 1, through hole 101, terminal 2, exhaust hole 201, threaded hole 202, first conductive member 31, through hole 311, through hole 312, second conductive member 32, force-receiving part 321, third conductive member 33, flange 331, insulating bushing 4, through hole 401, through hole 402, excitation source 5, first piston 6, sealing groove 601, limiting step 602, guide cylinder 7, second piston 8, melt 9. Detailed implementation manners

[0061] The tubular excitation fuse of the present invention includes an outer shell, and a terminal, an insulating bushing, an excitation source, a first piston and a conductor assembly located in the outer shell;

[0062] Terminals are respectively arranged at both ends of the outer shell. The conductor assembly and the insulating bushing are both tubular structures. The conductor assembly is arranged in the outer shell, and both ends of the conductor assembly are electrically and fixedly connected to the terminals. The insulating bushing is sleeved on the outer periphery of the conductor assembly;

[0063] The conductor assembly includes a first conductive member with both ends penetrating. At least one end of the first conductive member is electrically connected in series in a sleeved manner with multiple conductive members with both ends penetrating. The conductive member located at the end of the conductor assembly is fixedly connected to the terminal in an electrically conductive manner; a force-receiving part is arranged in the radial direction in one of the conductive members between the first conductive member and the conductive member at the end of the conductor assembly. The end of the conductive member provided with the force-receiving part close to the terminal is sleeved in the adjacent conductive member;

[0064] One end of the driving force release of the excitation source sequentially passes through the outer casing, the insulating bushing, and is located within the first conductive member; a first piston is disposed between the driving force release end of the excitation source and the conductive member provided with a force-receiving portion. One end of the first piston is close to the force-receiving portion of the conductive member, and the other end of the piston is located within the first conductive member. The first piston is in sealed contact with the inner wall of the conductor assembly;

[0065] When the excitation source operates according to the received trigger signal to release the driving force, the driving force drives the displacement of the first piston. The first piston abuts against the force-receiving portion of the conductive member, pushing the conductive member provided with the force-receiving portion to displace toward the terminal side, disconnecting the conductor assembly.

[0066] To further improve the breaking capacity, an arc extinguishing medium is filled in the cavity formed among the outer casing, the conductor assembly, the terminal, and the insulating bushing. The arc extinguishing medium is a solid arc extinguishing medium, such as quartz sand, or the arc extinguishing medium can also be liquid, such as arc extinguishing gel, etc.

[0067] To further improve the breaking capacity, a fuse element is conductively connected in parallel between the terminals between the insulating bushing and the outer casing. The resistance of the fuse element is much greater than the resistance of the conductor assembly and the terminals. During normal current conduction, the current flows through the main circuit formed by the terminals and the conductor assembly. When the fuse element is connected in parallel, after the conductor assembly is disconnected, the fuse element can be disconnected through the second piston.

[0068] The connection strength between the conductive member provided with the force-receiving portion and the adjacent conductive member is less than the connection strength between other conductive members. The purpose is that when the conductive member provided with the force-receiving portion is driven to displace by the driving force, it will not affect the connection between other conductive members, ensuring the smooth displacement of the conductive member provided with the force-receiving portion.

[0069] Socket connection method: For two adjacent conductive members, one is sleeved on the outer periphery or inner wall of the other, based on the principle of not affecting the displacement of the conductive member provided with the force-receiving portion. The connection strength after socket connection can be achieved through fixing methods such as interference fit, spot welding, and wire welding.

[0070] For the above technical solutions, the following gives preferred embodiments and specific descriptions in combination with the drawings.

[0071] Refer to Figures 1 to 10 As shown in

[0072] Refer to Figure 1 and Figure 4, the outer shell 1 is a circular tubular structure with both ends open. In other embodiments, it can also be a square tubular structure. The material of the outer shell 1 is an insulating material, such as ceramic, melamine or plastic. A through hole 101 is provided at the central position of the shell wall of the outer shell 1 along its length direction.

[0073] The terminal 2 is made of a conductive material. Its outer circumference matches the inner wall of the outer shell 1 and is located at both ends of the outer shell 1 to close both ends of the outer shell 1. An exhaust hole 201 communicating the inside and outside of the shell is provided on the terminal 2. A threaded hole 202 for connection is provided on the end face of the terminal 2 located outside the outer shell 1, which is convenient for the installation and connection of the excitation fuse.

[0074] It should be noted that in each embodiment, the exhaust hole communicates the inside and outside of the shell. In particular, it communicates the inside of the tubular structure of the conductive member electrically connected to the terminal with the outside of the shell. Among them, it can be that the conductive member adjacent to the terminal is provided with a through structure to communicate the inside of its tubular structure and the exhaust hole, or a through hole corresponding to the exhaust hole is provided on the conductive member adjacent to the terminal to communicate the inside of the tubular structure and the exhaust hole, and then communicate to the outside of the shell. When the conductive member with a stress part inside the shell is displaced, the gas inside the conductive member electrically connected to the terminal can be discharged from the shell through the exhaust hole. The exhaust hole 201 on the terminal 2 communicates the inside and outside of the shell. The exhaust hole can discharge the gas dissipated to the terminal after the conductor assembly is disconnected from the disconnection process to the disconnection, reducing the internal pressure of the shell.

[0075] The conductor assembly is made of a conductive material. In this embodiment, the conductor assembly includes a first conductive member 31, a second conductive member 32, and a third conductive member 33. The first conductive member 31 is a circular tubular structure with both ends open. The second conductive member 32 is a circular tubular structure with one end closed and one end open. The third conductive member 33 is a circular tubular structure with one end open and one end provided with a flange 331. The closed end of the second conductive member 32 forms a stress part.

[0076] At both ends of the first conductive member 31, a second conductive member 32 and a third conductive member 33 are electrically connected in sequence. The third conductive member 33 is located at both ends of the conductor assembly. The connection method is as follows: The open end of the second conductive member 32 is sleeved on the outer periphery of the end of the first conductive member 31, and the open end of the third conductive member 33 is sleeved on the outer periphery of the closed end of the second conductive member 32. The second conductive member 32 is electrically connected to the first conductive member 31 and the second conductive member 32 is electrically connected to the third conductive member 33 respectively by an interference fit or by a spot welding connection method. When the number of conductive members included in the conductor assembly is more than four, the connection strength between the second conductive member 32 provided with a stress portion and the first conductive member 31 and the third conductive member 33 is less than the connection strength between other conductive members, so as to ensure that during the process of the first disconnection between the second conductive member 32 and the first conductive member 31, and it can displace along the third conductive member 33 without damaging the connection between other conductive members.

[0077] The conductor assembly is inserted through the housing 1 and is located between the terminal blocks at both ends of the housing 1. The ends of both ends of the conductor assembly, that is, the end of the third conductive member 33 with a flange, are fixedly connected to the terminal block 2 by welding through the flange, so that the terminal block and the conductor assembly form an integral structure.

[0078] The insulating bushing 4 is made of an insulating material and has a circular tubular structure with both ends penetrating. The insulating bushing 4 is located inside the housing 1. The insulating bushing 4 is sleeved on the outer periphery of the conductor assembly. Specifically, the insulating bushing 4 is sleeved on the outer peripheries of the first conductive member 31 and the second conductive member 32, and the insulating bushing 4 is in close contact with the first conductive member 31 and the second conductive member 32. The third conductive member 33 is located on one side of both ends of the insulating bushing 4, and the open end of the third conductive member 33 connected to the second conductive member 32 abuts against the end face of the insulating bushing 4 to fix the insulating bushing 4.

[0079] The outer diameter of the insulating bushing 4 is smaller than the inner diameter of the housing 1. One side of the outer periphery of the insulating bushing 4 is attached to the inner wall of the housing 1, and the radial distance between the outer periphery of the insulating bushing on the other side opposite to the side attached to the inner wall of the housing 1 and the inner wall of the housing 1 is the largest, forming an accommodation space.

[0080] The setting of the insulating bushing can support the conductor assembly, especially the first conductive member and the second conductive member. At the same time, it can prevent the arc extinguishing medium outside the tubular structure of the conductor assembly from leaking or flowing into the conductor assembly during the movement of the second conductive member. At the same time, during the displacement process of the second conductive member, the tube wall of the third conductive member can play a guiding role, and the insulating bushing can also play a guiding role.

[0081] At the position where the insulating bushing 4 is in contact with the inner wall of the outer shell 1, through holes (101, 401, 311) are provided at the corresponding positions of the outer shell 1, the insulating bushing 4, and the first conductive member 31. Through holes (402, 312) are respectively provided at the position of the accommodating space, the insulating bushing 4, and the first conductive member 31 close to the second conductive member 32. The inner diameter of the through hole 311 of the first conductive member is smaller than the inner diameters of the through holes (101, 401) of the outer shell 1 and the insulating bushing 4. An excitation source 5 is provided in the through holes (101, 401, 311) of the outer shell 1, the insulating bushing 4, and the first conductive member 31. One end of the excitation source 5 that releases the driving force passes through the through hole 311 of the first conductive member and is located inside the first conductive member 31. The excitation source 5 is fixed by a gland provided in the through hole 401 of the outer shell 1. The signal receiving end of the excitation source 5 is located outside the outer shell 1 and can receive the trigger signal sent externally.

[0082] The excitation source 5 is a miniature gas generating device. When it receives the trigger signal (electrical signal) sent externally and then heats up to cause a chemical reaction of the gas generating agent, a large amount of high-pressure gas is released into the first conductive member 31 as the driving force.

[0083] First pistons 6 are respectively provided in the first conductive member and the second conductive member on both sides of one end of the excitation source 5 that releases the driving force. The first pistons 6 are in contact with the inner walls of the first conductive member and the second conductive member. The first pistons 6 are in sealing fit, small clearance fit, or interference fit with the first conductive member. No matter what the fit method is, it is necessary to satisfy that when impacted by the driving force released by the excitation source, the first piston can displace relative to the first conductive member and push the second conductive member to displace and disconnect the conductive connection with the first conductive member. The first pistons 6 are made of insulating materials. One end of the first piston 6 is located in the second conductive member 32 and is close to the closed end of the second conductive member 32. The other end of the first piston 6 is located in the first conductive member 31 and closes the through hole 312 on the first conductive member. At least one circle of sealing grooves 601 is provided along the circumferential direction on the outer periphery of the first piston 6 in contact with the first conductive member 31. Sealing rings are provided in the sealing grooves 601 to make the first piston 6 in sealing contact with the first conductive member. Since the second conductive member 32 is sleeved on the outer peripheral wall of the first conductive member 31, the inner diameter of the second conductive member is larger than the inner diameter of the first conductive member 31. The outer diameter of one end of the first piston 6 located in the second conductive member 31 is larger than the outer diameter of the part of the first piston 6 located in the first conductive member 31. A limiting step 602 is formed on the outer periphery of the first piston 6. The end of the first conductive member 31 abuts against the limiting step of the first piston 6 to limit the initial position of the first piston 6. The through hole 312 on the first conductive member 31 is located between the sealing ring 601 and the limiting step 602 of the first piston 6.

[0084] A guide cylinder 7 is provided at the accommodation space between the outer shell 1 and the insulating bushing 4, corresponding to the through holes (402, 312) of the insulating bushing 4 and the first conductive member 31. The guide cylinder 7 is fixed to the outer shell 1 and the insulating bushing 4. One end of the guide cylinder 7 is open and the other end is closed, and a displacement channel is formed in the guide cylinder 7. The open end of the guide cylinder 7 is docked with the through hole 402 on the insulating bushing 4. A limiting step is provided on the displacement channel at the open end of the guide cylinder 7. A second piston 8 is provided in the through holes (402, 312) of the first conductive member 31 and the insulating bushing 4. The second piston 8 is arranged in the through hole in an interference fit manner. The outer shape of the second piston 8 is T-shaped, and a limiting rib is formed on its outer peripheral surface.

[0085] After the melt 9 passes through the accommodation space between the outer shell 1 and the insulating bushing 4 and passes through the guide cylinder 7, both ends of the melt 9 are fixedly connected to the terminal blocks at both ends of the outer shell 1 by welding. The melt 9 is located on the displacement path of the second piston 8. A mechanically weak break point is provided on the melt 9, and the mechanically weak break point of the melt 9 is located in the displacement space outside the guide cylinder 7. The resistance of the melt 9 is much greater than the resistance of the conductor assembly, so as to ensure that when the current flows normally, almost all the current flows through the terminal blocks and the conductor assembly.

[0086] When the second piston 8 is driven to displace into the displacement channel of the guide cylinder, after the second piston 8 disconnects the melt 9, the limiting rib of the second piston 8 is clamped at the limiting step in the guide cylinder 7, forming a limitation on the displacement of the second piston 8. When the limiting rib of the second piston 8 contacts the limiting step of the guide cylinder, the second piston 8 is in the termination position.

[0087] The melt disconnection assembly formed by the guide cylinder and the second piston and the excitation source are respectively located on the opposite sides of the outer periphery of the insulating bushing, as shown in the structure in the attached drawings, to ensure the smooth displacement of the second piston.

[0088] An arc extinguishing medium is filled in the cavity formed among the outer shell 1, the insulating bushing 4, the terminal blocks and the conductor assembly. The melt 9 is arranged in the arc extinguishing medium. The mechanically weak break point of the melt 9 is located in the arc extinguishing medium. The conductor assembly outside the insulating bushing 4 is located in the arc extinguishing medium. The arc extinguishing medium can be solid or liquid. The solid arc extinguishing medium, such as quartz sand, and the liquid arc extinguishing medium, such as arc extinguishing gel.

[0089] The working principle of the tubular excitation fuse of the present invention:

[0090] In the normal working state, the terminal blocks are connected to the main circuit, and the current flows through the terminal blocks and the conductor assembly.

[0091] When an overload, short - circuit current or abnormal situation (vehicle collision) occurs, a trigger signal is sent from the outside of the tubular excitation fuse to the excitation source 5. After the signal receiving end of the excitation source 5 receives the trigger signal, it heats up and ignites, releasing a large amount of high - pressure gas into the first conductive part 31 as a driving force. The driving force drives the displacement of the first pistons 6 at both ends of the first conductive part 31 respectively. The first pistons 6 displace along the first conductive part 31 and abut against the closed end of the second conductive part 32, that is, the force - receiving part, and push the second conductive part 32 to displace, so that the connection between the second conductive part 32 and the first conductive part 31 is disconnected. Then, the second conductive part 32 is driven to displace along the third conductive part 33 towards the side of the terminal 2, forming two breaks between the two ends of the first conductive part 31 and the second conductive part 32, disconnecting the conductor assembly, and thus disconnecting the main circuit where the conductor assembly is located; after the first pistons 6 displace to disconnect the connection between the second conductive part and the first conductive part, the first pistons 6 continue to displace, exposing the through - holes 312 on the first conductive part 31, making the through - holes 312 communicate with the cavity where the end of the excitation source 5 that releases the driving force is located. The driving force drives the displacement of the second pistons 8 through the through - holes 312. The second pistons 8 displace along the displacement channels of the guide cylinders 7, pushing the fuse element 9 to displace along the displacement channels together, and pulling the fuse element 9 to break at the mechanically weak break point of the fuse element 9, forming a break on the fuse element 9. The break formed on the fuse element 9 is located in the arc - extinguishing medium, and the arc generated at the break of the fuse element 9 is extinguished by the arc - extinguishing medium.

[0092] Its arc - extinguishing principle:

[0093] When an overload, short - circuit current or abnormal situation occurs and the conductor assembly is disconnected, the current flows through the fuse element 9, achieving zero - current cut - off of the main circuit. Since the resistance of the fuse element is much larger than the resistance of the main circuit formed by the conductor assembly and the terminal, the current flowing through the fuse element 9 is reduced exponentially. When the fuse element 9 is disconnected, the arc generated at the break of the fuse element 9 is relatively reduced, and the generated arc is directly extinguished by the arc - extinguishing medium. When the fuse elements are connected in parallel, since the resistance of the conductor assembly is much smaller than the resistance of the fuse element, the temperature rise of the tubular excitation fuse can be significantly reduced, and the ability to withstand current impact is greatly improved.

[0094] Due to the use of a tubular - structured conductor assembly, when the tubular - structured conductor assembly is disconnected, the tubular - structured conductor assembly directly bears the impact energy brought by the driving force released by the excitation source, reducing the impact on the outer shell. Therefore, the requirement for the strength of the outer shell can be relatively low.

[0095] In this embodiment, since the first piston is located in the cavity formed by the first conductive member and the second conductive member, and the high-pressure gas released by the excitation source is located in the sealed cavity formed between the two first pistons and the first conductive member, the impact energy generated by the high-pressure gas released by the excitation source is directly borne by the first conductive member and the second conductive member. Coupled with the buffering of the insulating bushing 4 and the buffering brought about by the displacement of the second conductive member, the impact energy borne by the outer shell is reduced to the lowest level. Therefore, the mechanical strength requirement for the outer shell is relatively low, and its material adaptability is wider. In addition to the traditional ceramic outer shell, a melamine outer shell or a plastic outer shell can also be used. When a plastic outer shell is used, it is convenient to process and has a low cost.

[0096] In order to further provide the breaking capacity, in other embodiments, an arc extinguishing structure is provided between the connection of the first conductive member and the second conductive member and the insulating bushing. The arc extinguishing structure can be an arc extinguishing grid structure or an arc extinguishing metal wire mesh structure, etc. The arc extinguishing grid structure and the metal wire mesh can be fixedly arranged on the inner wall of the insulating bushing.

[0097] In other embodiments, one end of the second conductive member that is closed may not be completely closed. Refer to Figure 18 , a semi-closed force-bearing part 321 is provided in the radial direction between the two ends of the second conductive member 32. The force-bearing part 321 has a hollow part. One end of the first piston 6 contacts and closes the force-bearing part 321. Through the force-bearing part 321, the second conductive member 32 can be driven by the first piston 6.

[0098] The force-bearing part on the second conductive member is not limited to being provided at both ends. It can also be like Figure 18 and be provided between the two ends of the second conductive member. As long as the second conductive member forms a block to the displacement of the first piston through the force-bearing part, so that when the first piston displaces, a driving force can be applied to the second conductive member, and the first piston will not break away and fly out from the second conductive member, and the second conductive member can be pushed to displace synchronously. Therefore, as long as a force-bearing part on the second conductive member where the first piston can apply a driving force is provided, such as a completely closed end or a partially closed end. Of course, it is preferred that the end of the second conductive member is completely closed because the completely closed end can fully bear the impact energy received by the first piston and protect the first piston. When the end is partially closed, the first piston at the unblocked part may undergo a large deformation due to the impact energy received, resulting in deformation or even damage of the first piston.

[0099] In the above embodiments, the conductor assembly is composed of a first conductive member, a second conductive member, and a third conductive member. In other embodiments, conductive members can be added between the second conductive member and the first conductive member, and between the second conductive member and the third conductive member. The added conductive members are all tubular structures with both ends penetrating, and the added conductive members are electrically connected to the first conductive member, the second conductive member, and the third conductive member. At the same time, the added conductive members cannot affect the setting of the first piston and cannot affect the first piston's pushing the second conductive member to displace and disconnect the conductor assembly.

[0100] In other embodiments, the conductor assembly can also be composed of only three conductive members. For example, on the basis of the conductor assembly of Figure 2 , remove the second conductive member, the third conductive member, and the first piston at one end of the first conductive member, and only retain the second conductive member, the third conductive member, and the first piston at the other end of the first conductive member. One end of the first conductive member is fixedly connected to the terminal end, and the third conductive member at the end of the conductor assembly is also fixedly connected to the terminal at the other end. With such a structure, the driving force released by the excitation source can drive the first piston to displace, so that the second conductive member at one end of the first conductive member is disconnected from the first conductive member and the conductor assembly is disconnected.

[0101] As can be seen from the above, the ends of the conductor assembly are the two ends of the entire conductor assembly, and the two ends of the entire conductor assembly need to be fixedly connected to the terminals at both ends of the housing respectively.

[0102] In some other embodiments, the fuse element can be not provided. The purpose of setting the parallel fuse element is to improve the breaking capacity of the fuse. However, in some low-voltage applications, the arc generated during breaking is relatively small, and with the assistance of air or additional arc extinguishing grids and arc extinguishing wire meshes, the arc can be extinguished well, so the fuse element does not need to be provided and the breaking requirements can be met.

[0103] In other embodiments, the first piston can also be not provided. Refer to Figures 11 to 17 , when the piston is not provided, the difference from the structure of Figure 2 is that the setting and position of the force-receiving part of the second conductive member 32 must meet the following requirements: the force-receiving part must be completely enclosed, and in the hollow part of the enclosed tubular second conductive member 32, a sealed cavity must be formed between the first conductive member provided with the excitation source and the force-receiving parts of the second conductive members at both ends thereof to ensure that the high-pressure gas released by the excitation source has sufficient pressure as the driving force.

[0104] For example Figure 13 and Figure 14, one end of the second conductive member 32 located at the third conductive member 33 must be closed to form a closed stress-bearing portion 321, closing the hollow portion in the closed tubular second conductive member 32. The open end of the second conductive member 32 is sleeved on the outer periphery or inner wall of the first conductive member 31, and a sealed cavity is formed between the first conductive member 31 and the stress-bearing portions 321 of the second conductive members at its two ends.

[0105] See Figure 15 , the closed stress-bearing portion 321 is arranged between the two ends of the second conductive member 32, closing the hollow portion in the closed tubular second conductive member 32. The two ends of the second conductive member 32 are respectively sleeved inside the first conductive member 31 and the third conductive member 33, and a sealed cavity is formed between the first conductive member 31 and the stress-bearing portions 321 of the second conductive members at its two ends.

[0106] See Figure 16 , and Figure 13 、 Figure 14 Contrary to the structure of

[0107] See Figure 17 , on the basis of Figure 16 , change the structural form of the third conductive member 33. One end of the third conductive member 33 sleeved with the second conductive member is closed. The open end of the second conductive member 32 is sleeved on the outer periphery of the third conductive member 33. The closed end of the second conductive member 32 serving as the stress-bearing portion 321 is sleeved at the inner wall of the first conductive member, and a sealed cavity is formed between the first conductive member 31 and the stress-bearing portions 321 of the second conductive members at its two ends.

[0108] In the initial position, the second conductive member 32 closes the through-hole where the second piston 8 is located, so that the second piston 8 is not in communication with the sealed cavity where the driving-force release end of the excitation source 5 is located. The fracture after the first conductive member 31 and the second conductive member 32 are initially disconnected is located in the insulating bushing 4, that is, the first conductive member 31 must be located in the insulating bushing 4, and both ends of the first conductive member 31 need to be indented into both ends of the insulating bushing 4. At the same time, the distance between the end of the first conductive member 31 and the end of the insulating bushing 4 ensures that an insulating fracture can be formed after the first conductive member 31 and the second conductive member 32 are disconnected, so as to ensure that after the second conductive member 32 is driven to displace by the driving force released by the excitation source 5, disengages from the first conductive member 31 and is disconnected, that is, after the main circuit is disconnected, the through-hole where the second piston 8 is located is in communication with the chamber where the driving-force release end of the excitation source 5 is located. A relatively closed chamber is formed among the disconnected second conductive member 32, the first conductive member 31 and the insulating bushing 4, and the through-hole where the second piston 8 is located is in this chamber, so that the driving force released by the excitation source 5 still has sufficient pressure to drive the second piston 8 to displace and disconnect the melt. In this technical solution, the conductive member provided with the force-receiving part serves both as a part of the conductor assembly to be disconnected when the main circuit is disconnected and is equivalent to the function of a metal piston. Therefore, in this technical solution, the first piston is saved and the corresponding installation process of the first piston is reduced. Moreover, when the second piston is provided, there is no need to open a hole in the conductor assembly, and only the through-hole on the insulating bushing needs to be closed by the conductive member provided with the force-receiving part, saving the process of opening a through-hole in the conductor assembly.

[0109] In other embodiments, taking Figure 2 as an example, only one piston can be provided. The second conductive member at one end of the first conductive member is pushed to displace by the first piston, and the second conductive member at the other end is directly pushed to displace by the driving force released by the excitation source and the pressure of the high-pressure gas.

[0110] In short, when a piston is provided, the force-receiving part of the conductive member to be pushed by the piston may not be closed and can be closed by the piston. When no piston is provided, the force-receiving part of the conductive member to be pushed needs to be closed so that the high-pressure gas released by the excitation source can act on the closed force-receiving part, preventing the pressure of the high-pressure gas from dropping suddenly due to the unclosed force-receiving part and losing the driving function.

[0111] In some other embodiments, the guide cylinder and the second piston may not be provided, and the melt can be melted and broken by heat.

Claims

1. A tubular excitation fuse, characterized in that, It includes a housing, a terminal, and an insulating bushing, an excitation source, an insulating first piston, and a conductor assembly located in the housing; The terminals are fixedly connected to both ends of the housing respectively. Both the conductor assembly and the insulating bushing are tubular structures. The conductor assembly is arranged in the housing, and both ends of the conductor assembly are electrically and fixedly connected to the terminals respectively. The insulating bushing is sleeved on the outer periphery of the conductor assembly; The conductor assembly is a tubular structure, including a first conductive part with both ends penetrating. At least two conductive parts are electrically connected in series in a sleeved manner at at least one end of the first conductive part. A stress part is arranged in the radial direction on the inner wall of one of the conductive parts located between the first conductive part and the end of the conductor assembly. One end of the conductive part provided with the stress part, which is away from the first conductive part, is sleeved inside or outside the tube wall of the adjacent conductive part. The conductive part provided with the stress part can be displaced in the direction towards the terminal under the drive of an external force and is disconnected from the first conductive part in terms of electrical connection; The excitation source is fixedly arranged by passing through the housing, the insulating bushing, and the first conductive part in sequence, and the driving force release end of the excitation source is located in the first conductive part; a first piston is arranged between the driving force release end of the excitation source and the conductive part provided with the stress part. The first piston is located in the tubular structure of the conductor assembly. One end of the first piston is close to the stress part, and the other end of the piston communicates with the chamber where the driving force release end of the excitation source is located. The first piston is in sealed contact or small-gap fit with the inner wall of the conductor assembly; When the excitation source acts according to the received trigger signal and releases the driving force, the driving force drives the first piston to displace. The first piston abuts against the stress part and pushes the conductive part provided with the stress part to displace towards the terminal side, disconnecting the electrical connection with the first conductive part and disconnecting the conductor assembly.

2. The tubular excitation fuse according to claim 1, characterized in that, The conductor assembly includes the first conductive member, and a second conductive member and a third conductive member are successively connected in series in a sleeved manner at both ends of the first conductive member; the third conductive member is located at both ends of the conductor assembly and is fixedly connected to the wiring terminals located at both ends of the housing in a conductive manner; one end of the second conductive member is sleeved on the end of the first conductive member, and the other end of the second conductive member is sleeved on the end of the third conductive member. A force-receiving portion is provided in the radial direction of the second conductive member, and the force-receiving portion of the second conductive member is located at one end of the second conductive member; the force-receiving portion is of a fully enclosed or semi-enclosed structure; a displacement space for the displacement of the second conductive member is reserved between the second conductive member and the wiring terminal; a first piston is respectively provided between the driving force release end of the excitation source and the force-receiving portion of the second conductive member, and the first piston is in sealed contact or small-gap fit with the inner wall of the first conductive member; or, a first piston is provided between the driving force release end of the excitation source and one end of the force-receiving portion of one of the second conductive members, and the force-receiving portion of the other second conductive member without the first piston is of a fully enclosed structure; When the excitation source acts according to the received trigger signal and releases the driving force, the driving force acts on the first piston, or directly acts on the force-receiving portion of the second conductive member without the first piston. The force-receiving portion of the second conductive member displaces along the third conductive member under the drive of the first piston or the direct drive of the driving force, and the second conductive member is disconnected from the first conductive member, disconnecting the conductor assembly, thereby disconnecting the main circuit where the conductor assembly is located.

3. The tubular excitation fuse according to claim 2, characterized in that, The insulating bushing is sleeved on the outer peripheries of the first conductive member and the second conductive member, and both ends of the insulating bushing are respectively abutted against one end of the third conductive member close to the first conductive member.

4. The tubular excitation fuse according to claim 3, wherein A conductive flange is connected to one end of the third conductive member close to the wiring terminal, and the conductive flange is fixedly connected to the wiring in a conductive manner.

5. The tubular excitation fuse according to claim 2, wherein, An arc extinguishing device is provided in the housing, and the arc extinguishing device is located between the insulating bushing and the connection between the first conductive member and the second conductive member.

6. The tubular excitation fuse according to claim 5, wherein, The arc extinguishing device is an arc extinguishing grid or an arc extinguishing wire mesh, and the arc extinguishing grid or the arc extinguishing wire mesh is provided on the inner wall of the insulating bushing.

7. The tubular excitation fuse according to claim 2, characterized in that, A sealing groove is formed in the circumferential direction on the outer periphery of the first piston, and a sealing ring is provided in the sealing groove, and the sealing ring abuts against the inner wall of the first conductive member.

8. The tubular excitation fuse according to claim 1, wherein Corresponding exhaust holes are provided in the wiring terminals, and the exhaust holes communicate the inside and outside of the housing. The exhaust holes can discharge the gas dissipated to the wiring terminals after the conductor assembly is disconnected during the disconnection process of the conductor assembly out of the housing.

9. The tubular fuse according to claim 8, characterized in that, Threaded holes for connection are provided on the end face of the wiring terminal located outside the housing.

10. The tubular excitation fuse according to claim 1, characterized in that, When more than three conductive members are successively connected to one end of the first conductive member, the connection strength between the conductive member provided with the force-receiving portion and its adjacent conductive member is less than the connection strength between other conductive members in the conductor assembly.

11. The tubular excitation fuse according to claim 10, wherein, The conductive member provided with the force-receiving portion is connected to the adjacent conductive member in an interference fit manner, a welding manner, or a snap connection manner.

12. The tubular excitation fuse according to any one of claims 1 to 11, characterized in that, An arc extinguishing medium is filled between the structure formed by the outer shell and the terminal and the outside of the structure formed by the conductor assembly and the insulating bushing sleeved on the outer periphery of the conductor assembly.

13. The tubular excitation fuse according to claim 12, characterized in that, One side of the outer periphery of the insulating bushing is attached to the inner wall of the outer shell, the excitation source is arranged through the side where the insulating bushing is attached to the outer shell, and a receiving space is reserved between the other side of the outer periphery of the insulating bushing and the outer shell; At least one guiding cylinder located in the displacement channel is arranged in the receiving space. Both ends of the guiding cylinder are in contact with the outer periphery of the insulating bushing and the inner wall of the outer shell respectively. A through hole is opened at the position of the insulating bushing corresponding to the guiding cylinder, or a through hole penetrating the insulating bushing and the first conductive member is opened at the positions of the insulating bushing and the first conductive member corresponding to the guiding cylinder. A second piston is arranged in the through hole, and the second piston can enter the displacement channel of the guiding cylinder under the drive of an external force; In the initial position, the open end of the through hole is closed by the first piston or the conductive member provided with the force-receiving portion, and the closed open end of the through hole is located on the displacement path of the first piston or the conductive member provided with the force-receiving portion; A melt is conductively connected between the terminals at both ends inside the outer shell. The melt is located in the receiving space and passes through the guiding cylinder, and the melt is located on the displacement path of the second piston; When the first piston displaces to cause the conductive member provided with the force-receiving portion to displace and disconnect the conductive connection with the first conductive member and disconnect the conductor assembly, the through hole communicates with the chamber where one end of the excitation source releases the driving force and the space where the second piston is located, and the driving force drives the second piston to displace along the displacement channel of the guiding cylinder to disconnect the melt.

14. The tubular excitation fuse according to claim 13, characterized in that, A limiting rib is arranged on the second piston, and a limiting step is arranged at the opening of the displacement channel at one end of the guiding cylinder close to the second piston; when the limiting rib of the second piston displaces to the limiting step of the guiding cylinder, the second piston is in the terminal position.

15. A tubular excitation fuse, characterized in that, It includes an outer shell, a terminal, and an insulating bushing, an excitation source, and a conductor assembly located in the outer shell; The terminals are respectively arranged at both ends of the outer shell. The conductor assembly and the insulating bushing are both tubular structures. The conductor assembly is arranged in the outer shell, and both ends of the conductor assembly are conductively connected or conductively abutted to the terminals respectively. The insulating bushing is sleeved on the outer periphery of the conductor assembly; The conductor assembly is a tubular structure, including a first conductive member with both ends penetrating. At least two conductive members are conductively connected in series in a sleeved manner at at least one end of the first conductive member; one end of one of the conductive members between the first conductive member and the conductive member at the end of the conductor assembly is completely closed to form a force-receiving portion; The excitation source is fixedly arranged through the housing, the insulating bushing and the first conductive member in sequence, and the driving force release end of the excitation source is located in the first conductive member; a closed cavity is formed by communicating the cavity where the driving force release end of the excitation source is located with the inside of the conductor provided with the force receiving portion. When the excitation source acts according to the received trigger signal and releases the driving force, the driving force drives the conductor provided with the force receiving portion to displace away from the first conductive member, so as to be disengaged from the conductive connection with the first conductor and disconnect the conductor assembly.

16. The tubular excitation fuse according to claim 15, characterized in that, The conductor assembly includes the first conductive member, and a second conductive member and a third conductive member are sequentially connected in series in a sleeved manner at both ends of the first conductive member; the third conductive member is located at both ends of the conductor assembly and is fixedly connected to the wiring terminals located at both ends of the housing in a conductive manner; one end of the second conductive member is sleeved on the end of the first conductive member, and the other end of the second conductive member is completely enclosed and sleeved inside the end of the third conductive member, and the enclosed end of the second conductive member forms the force receiving portion; a displacement space is reserved between the enclosed end of the second conductive member and the wiring terminal close to it; the cavity where the driving force release end of the excitation source is located is communicated with the inside of the second conductive member; when the excitation source acts according to the received trigger signal and releases the driving force, the driving force acts on the force receiving portion of the second conductive member, driving the second conductive member to displace along the third conductive member, so that the second conductive member is disengaged from the conductive connection with the first conductive member and disconnects the conductor assembly.

17. The tubular excitation fuse according to claim 16, wherein, A receiving space is reserved between the insulating bushing and the housing, and the insulating bushing is located on the outer periphery of the first conductive member and the second conductive member. At least one through hole is opened at the corresponding positions of the first conductive member and the insulating bushing at the receiving space, and a guiding cylinder with a displacement channel is arranged in the receiving space and is docked with the through hole; a second piston is arranged in the through hole, and the melt passes through the receiving space between the insulating bushing and the housing and the guiding cylinder and is conductively connected to the wiring terminals located at both ends of the housing; the melt is located on the displacement path of the second piston; when the second conductive member is in the initial position, the second conductive member closes the through hole; when the second conductive member is disengaged from the conductive contact with the first conductive member and disconnects the conductor assembly, the through hole is communicated with the cavity where the driving force release end of the excitation source is located, and the driving force drives the second piston to displace along the displacement channel of the guiding cylinder to disconnect the melt.

Images