Excitation fuse structure provided with multiple conducting bars

Abstract

The excitation fuse structure provided with the multiple conducting bars comprises a shell, an electronic ignition device located in the shell, a piston and more than two conducting bars arranged in the displacement direction of the piston at intervals in an insulated mode, each conducting bar is connected with a melt in parallel, and the melts are arranged in an insulated mode; the piston is provided with impact ends corresponding to the conducting bars, conducting bar parts, which are located in the shell and need to be disconnected by the piston, of the conducting bars are arranged in a staggered manner, orthographic projection parts of the conducting bars are overlapped, and the conducting bar parts, which need to be disconnected by the piston, of the conducting bars are arranged to be of a narrow-neck structure; the lengths of the impact ends in the piston displacement direction are different; when the electronic ignition device releases driving force to drive the pistons to move, the pistons are disconnected at the same time or successively disconnect the conducting bars, and then the melt is fused. The two conducting bars are designed into the staggered narrow neck structure in the shell, so that the excitation fuse is more compact in structure and smaller in size, and simultaneous or successive on-off of two circuits can be realized.

Description

Technical Field

[0001] The present invention relates to the fields of power control and electric vehicles, and particularly to an excitation fuse structure with multiple conductive bars used in a polyphase circuit and having a complex internal structure of a product where current breaking is required. Background Art

[0002] Currently, there already exists a relatively mature excitation fuse product on the market that breaks the circuit in a mechanical disconnection manner. Its general structure composition is as follows: an upper housing, a conductive busbar, and a lower housing are sequentially arranged. An electronic ignition device and a piston are sequentially arranged in the upper housing. A melt inner shell and a melt outer cover are arranged in the lower housing. A melt is disposed through between the melt inner shell and the melt outer cover. The melt is connected in parallel to the conductive busbar. A melt upper cutter and a melt lower cutter for holding the melt are arranged in the melt inner shell and the melt outer shell. A melt cutter push plate is arranged at one end of the melt upper cutter. A pre-breaking port is arranged on the conductive busbar. Both ends of the melt are connected in parallel to both sides of the pre-breaking port of the conductive busbar.

[0003] The working principle is as follows: The excitation fuse is connected in series in the circuit. When the vehicle is in a normal working state, the current flows through the conductive busbar of the excitation fuse, and the product can be regarded as a conductor. When the vehicle is in an abnormal working state and the circuit needs to be cut off, the vehicle control system sends a specified electrical signal to the electronic ignition device. The electronic ignition device triggers and releases high-pressure gas, which pushes the piston downward to break the pre-breaking port of the conductive busbar, forming a physical break. Then the current flows through the melt connected in parallel to the conductive busbar. Subsequently, the piston pushes the melt cutter push plate to displace, and the melt cutter push plate pushes the melt upper and lower cutters to displace, thereby cutting off the melt and completely cutting off the circuit. Although the performance of this excitation fuse has been improved compared with that of a thermal fuse, there are still the following deficiencies: Since the existing excitation fuse is relatively large in size and the conductive busbar is mostly single-way, it cannot adapt to some relatively complex circuit conditions; the melt structure requires too much space, increasing the weight and size of the overall excitation fuse. Summary of the Invention

[0004] The object of the present invention is to provide an excitation fuse structure with multiple conductive bars. By reasonably designing the spatial positions between the multiple conductive bars and making full use of the internal space of the excitation fuse housing, its structure is made more compact and smaller in size, realizing the miniaturization and light weight of the excitation fuse, so as to be more suitable for use in compact devices and at the same time protect the current flow of multiple circuits.

[0005] To achieve the above object, an excitation fuse structure with multiple conductive buses of the present invention includes a housing, an electronic ignition device, a piston, two or more conductive buses insulated and spaced along the displacement direction of the piston, a fuse element connected in parallel to each conductive bus, and the fuse elements are insulated from each other; a part of the conductive bus to be disconnected by the piston inside the housing is set as a neck structure, and the neck structures of the conductive buses are misaligned and insulated; the piston is misaligned with impact ends corresponding to the neck structures of the respective conductive buses, and the lengths of the impact ends in the displacement direction of the piston are different; when the electronic ignition device releases driving force to drive the piston to displace, after the piston disconnects the conductive buses at the same time, the fuse elements are fused.

[0006] Preferably, the conductive buses include a first conductive bus and a second conductive bus arranged opposite to each other, a first fuse element connected in parallel to the first conductive bus, and a second fuse element connected in parallel to the second conductive bus, and the first fuse element and the second fuse element are insulated from each other; a part of the first conductive bus and the second conductive bus to be disconnected inside the housing is set as the neck structure, and the neck structures on the first conductive bus and the second conductive bus are misaligned and insulated in a direction perpendicular to the displacement path of the piston; the piston is misaligned with a first impact end and a second impact end, and the lengths of the first impact end and the second impact end in the displacement direction of the piston are different; the first impact end corresponds to the neck structure of the first conductive bus, and the second impact end corresponds to the neck structure of the second conductive bus.

[0007] Preferably, two arc extinguishing chambers filled with arc extinguishing medium are spaced in the housing along the displacement direction of the piston on the outer periphery of the displacement path of the piston, and the first fuse element and the second fuse element respectively pass through one of the arc extinguishing chambers close to them.

[0008] Preferably, the housing includes an electronic ignition device protective sleeve, a first housing, a second housing, and a third housing arranged in sequence, the first conductive bus is arranged between the first housing and the second housing, and the second conductive bus is arranged between the second housing and the third housing; the arc extinguishing chambers are respectively located in the first housing and the third housing.

[0009] Preferably, accommodation grooves are respectively arranged on end faces of the first housing and the third housing facing the electronic ignition device, and the accommodation grooves are respectively sealed by cover plates to form the arc extinguishing chambers, the first fuse element passes through the arc extinguishing chamber in the first housing, and the second fuse element passes through the arc extinguishing chamber in the third housing.

[0010] Preferably, the arc extinguishing chamber is of an arc-shaped structure, and the first fuse element and the second fuse element are arc-shaped filamentary structures matching the arc extinguishing chamber.

[0011] Preferably, the piston is in sealed contact with the first housing, and the end faces of the first impact end and the second impact end of the piston are of notch structures. When the first impact end and the second impact end respectively break the first impact end and the second impact end, the notch structures are respectively straddled on the width direction of the narrow neck structures of the first conductive busbar and the second conductive busbar, so that the narrow neck structures are respectively located in the notches of the corresponding first impact end and the second impact end.

[0012] Preferably, an electrostatic ring is provided at the signal receiving end of the electronic ignition device.

[0013] Preferably, sealing rings are provided between the contact surfaces of the electronic ignition device protective sleeve, the first housing, the second housing, and the third housing, and silica gel is filled for sealing.

[0014] In the excitation fuse of the present invention, by arranging two conductive busbars facing each other and designing the conductive busbars into narrow neck structures in the housing, the narrow neck structures of the two conductive busbars are designed in a staggered manner, so that the two conductive busbars are simultaneously broken from the narrow neck structures by the piston at the same time or successively, and the two conductive busbars are insulated from each other after being broken and do not interfere with each other. The excitation fuse is smaller in size, more compact, and can realize the simultaneous on-off of two circuits.

[0015] An arc extinguishing chamber for threading a fuse element in parallel with the conductive busbar is designed in the space between the outer periphery of the piston displacement path and the outer wall of the housing, making full use of the unused space in the existing housing without the need to additionally design a space for accommodating the fuse element, so that the excitation fuse has a more compact structure, smaller size, and lighter weight.

[0016] The current flows through both ends of the conductive busbar connected in series to the protection system loop, which will not have an adverse impact on the fuse element connected in parallel, and because the conductive busbar has a large cross-section and a small resistance, it has good current impact resistance.

[0017] Through the sealed design of the excitation fuse housing, there are no air vents, which can prevent foreign objects from contaminating the fracture and can also prevent high-temperature electric arcs from spraying out of the housing and damaging the surrounding devices, improving the protection level. Description of the Drawings

[0018] Figure 1 It is a schematic diagram of the principle structure of the excitation fuse.

[0019] Figure 2 It is a schematic diagram of the appearance structure of the excitation fuse.

[0020] Figure 3It is a schematic cross-sectional view of an excitation fuse taken along the length direction of the conductive busbar.

[0021] Figure 4 It is a schematic cross-sectional view of an excitation fuse taken perpendicular to the direction of the conductive busbar.

[0022] Figure 5 It is a schematic diagram of a structure in which the narrow-neck structures of the first conductive busbar and the second conductive busbar are arranged out of alignment within the housing.

[0023] Figure 6 It is a schematic diagram of the piston structure.

[0024] Figure 7 It is a schematic diagram of the structural positional relationship between the piston and the conductive busbar.

[0025] Figure 8 It is a schematic diagram of the structural positional relationship between the piston and the conductive busbar.

[0026] Figure 9 It is a schematic diagram of a structure in which the first conductive busbar and the second conductive busbar provided with grooves are arranged out of alignment.

[0027] Reference numerals:

[0028] Electronic ignition device protective cover 101, first housing 102, first arc-shaped groove 102a, second housing 103, third housing 104, second arc-shaped groove 104a, electronic ignition device 105, piston 106, first impact end 106a, second impact end 106b, limit bump 106c, sealing groove 106d, first conductive busbar 107, narrow-neck structure 107a, groove 107b, second conductive busbar 108, narrow-neck structure 108a, first fuse element 109, second fuse element 110, static electricity ring 113, first cover plate 114, second cover plate 115. Detailed implementation mode

[0029] The excitation fuse structure with multiple conductive busbars of the present invention includes a housing, an electronic ignition device, a piston, two or more conductive busbars insulated and spaced along the displacement direction of the piston, a fuse element connected in parallel to each conductive busbar, and the fuse elements are insulated from each other; the piston is provided with impact ends corresponding to each conductive busbar, the parts of the conductive busbars located inside the housing that need to be disconnected by the piston are arranged out of alignment with each other, and the orthographic projection parts of each conductive busbar overlap, and the parts of the conductive busbars that need to be disconnected by the piston are provided with narrow-neck structures; the lengths of the impact ends in the displacement direction of the piston are different; when the electronic ignition device releases a driving force to drive the piston to displace, after the piston disconnects each conductive busbar simultaneously or successively, the fuse elements connected in parallel to the conductive busbars are fused.

[0030] The following are preferred embodiments and specific descriptions will be made in conjunction with the drawings. The orientation terms involved are only based on the orientation shown in the drawings and do not constitute a limitation on the technical solutions of the present invention.

[0031] Refer to Figures 1 to 9 , the excitation fuse of the present invention mainly includes an electronic ignition device protective sleeve 101, a first housing 102, a second housing 103, a third housing 104, an electronic ignition device 105, a piston 106, a first conductive bar 107, a second conductive bar 108, a first fuse element 109, and a second fuse element 110, where:

[0032] The electronic ignition device protective sleeve 101, the first housing 102, the second housing 103, and the third housing 104 are sequentially butted to form an excitation fuse housing. The excitation fuse housing is designed to be sealed without air vents. Therefore, sealing rings are provided at the contact surfaces of the parts of the electronic ignition device protective sleeve 101, the first housing 102, the second housing 103, and the third housing 104 that cooperate with each other, and are filled with silica gel to ensure excellent sealing performance. This can not only prevent external objects from contaminating the fracture, but also prevent the high-temperature electric arc from spraying out of the housing and damaging the surrounding devices.

[0033] Interconnected cavities for installing the electronic ignition device, the piston, and for the piston to displace are respectively provided in the electronic ignition device protective sleeve 101, the first housing 102, the second housing 103, and the third housing 104.

[0034] The electronic ignition device 105 is an electronic igniter that can act under the action of a trigger signal and release high-pressure gas as a driving force. The electronic ignition device 105 is arranged in the cavity in the electronic ignition device protective sleeve 101 that matches it. The signal receiving end of the electronic ignition device is located at one end of the cavity in the electronic ignition device protective sleeve facing the outside of the excitation fuse housing. The driving force release end of the electronic ignition device 105 is arranged facing the piston 106. An electrostatic ring 113 and a short-circuit ring are installed at the signal receiving end of the electronic ignition device 105. The short-circuit ring shorts the signal receiving end of the electronic ignition device to prevent the electronic ignition device from malfunctioning due to static electricity or other misoperations during the unused state, such as during storage, transportation, and installation, resulting in the excitation fuse operating and causing the product to be scrapped.

[0035] Refer to Figures 3 to 5, the first conductive busbar 107 is passed through between the first housing 102 and the second housing 103, and the second conductive busbar 108 is passed through between the second housing 103 and the third housing 104. The second housing 103 is made of insulating material to insulate and isolate the first conductive busbar 107 and the second conductive busbar 108. In order to save the space of the excitation fuse, in this embodiment, the first conductive busbar 107 and the second conductive busbar 108 are arranged opposite to each other. The two ends of the first conductive busbar 107 and the second conductive busbar 108 located outside the housing are respectively used as the wiring terminals of the two paths of the excitation fuse. The parts of the first conductive busbar 107 and the second conductive busbar 108 located inside the housing and on the displacement path of the piston 106 are both set into narrow neck structures (107a, 108a), and the narrow neck structures (107a, 108a) of the first conductive busbar 107 and the second conductive busbar 108 are arranged in a staggered manner. The widths at the narrow neck structures (107a, 108a) are respectively smaller than the widths of the bodies of the first conductive busbar 107 and the second conductive busbar 108. Disconnection weak points for reducing mechanical strength are respectively arranged on the narrow neck structures (107a, 108a). The disconnection weak points can be various structural forms such as grooves, variable cross-section structures, overlaps, etc. In this embodiment, the disconnection weak points are grooves in the shape of U, V or their combination opened on one or both sides of the narrow neck structures (107a, 108a).

[0036] The piston 106 is installed in the cavity of the first housing 102. One end of the driving force release of the electronic ignition device 105 is arranged corresponding to the end of the piston 106 facing the electronic ignition device 105, and the cavity where the driving force release end of the electronic ignition device 105 is located communicates with the cavity where the end of the piston 106 facing the electronic ignition device 105 is located.

[0037] The piston 106, see Figures 6 to 8 , has two impact ends, namely a first impact end 106a and a second impact end 106b. The two impact ends have different lengths and are arranged in a staggered manner. The first impact end 106a is arranged corresponding to the disconnection weak point at the narrow neck structure 107a of the first conductive busbar 107, and the second impact end 106b is arranged corresponding to the disconnection weak point at the narrow neck structure 108a of the second conductive busbar 108, that is, the narrow neck structure 107a of the first conductive busbar 107 is on the displacement path of the first impact end 106a, and the narrow neck structure 108a of the second conductive busbar 108 is on the displacement path of the second impact end 106b. In the initial position, the first impact end 106a is located in the first housing 102, and the second impact end 106b passes through the first housing 102 and is located in the second housing 103. A receiving groove for the disconnected part of the narrow neck structure of the first conductive busbar 107 and the first impact end to enter is opened in the second housing 102, and a receiving groove for the disconnected part of the narrow neck structure of the second conductive busbar 108 and the second impact end to enter is also opened on the third housing 103. When the first conductive busbar and the second conductive busbar are disconnected, they do not affect each other.

[0038] The two impact ends (106a, 106b) of the piston are arranged in a three-step structure. That is, the end of each impact end is provided with a notch structure for positioning and cutting. The bottom of the notch is the part for directly cutting the busbar. Therefore, the mechanical strength of the bottom of the notch is relatively large, and the structure of the bottom of the notch is also a structure convenient for the concentration of the acting force, such as a rhombus, a blade type, etc. The two sides of the bottom of the notch at the end of the impact end are respectively located on both sides of the width direction of the part of the busbar to be disconnected. After the piston acts, it is convenient to ensure that the busbar enters the notch structure of the impact end, forming positioning and guiding, and avoiding the horizontal relative displacement between the necking structure of the busbar and the impact end of the piston during cutting.

[0039] On the outer periphery of the piston head of the piston 106 facing the direction of the electronic ignition device 105, a sealing groove 106d is provided. A sealing ring is arranged in the sealing groove, so that the sealing contact between the sealing piston 106 and the inner wall of the cavity of the first housing 102 is realized. In other embodiments, sealing can also be achieved through the interference fit between the piston and the first housing. On both sides of one end face of the piston 106 facing the direction of the electronic ignition device 105, limiting bumps 106c are integrally formed respectively. When the piston 106 is installed, the limiting bumps 106c are located between the contact surfaces of the electronic ignition device protective sleeve 101 and the first housing 102, forming the initial position limitation of the piston 106.

[0040] On one end face of the first housing 102 on the outer periphery of the cavity where the piston 106 is located and facing the direction of the electronic ignition device protective sleeve 101, a first arc-shaped groove 102a is provided. A first cover plate 114 is arranged at the open end of the first arc-shaped groove 102a. The first cover plate 114 is clamped at the open end of the first arc-shaped groove 102a and seals it. The first cover plate 114 and the first arc-shaped groove 102a form a sealed first arc extinguishing chamber, and an arc extinguishing medium is filled in the first arc extinguishing chamber. The first fuse 109 is in a circular arc filament structure and is arranged in the arc extinguishing medium in the first arc extinguishing chamber. The two ends of the first fuse 109 pass through the first arc extinguishing chamber and are connected in parallel with the first busbar 107.

[0041] On the end face of the third housing 104 facing the direction of the second busbar and on the outer periphery of the cavity where the second impact end of the piston 106 is displaced, a second arc-shaped groove 104a is provided. A second cover plate 115 is arranged at the open end of the second arc-shaped groove 104a. The second cover plate 115 is clamped at the open end of the second arc-shaped groove 104a and seals it. The second cover plate 115 and the second arc-shaped groove 104a form a sealed second arc extinguishing chamber, and an arc extinguishing medium is filled in the second arc extinguishing chamber. The second fuse 110 is in a circular arc filament structure and is arranged in the arc extinguishing medium in the second arc extinguishing chamber. The two ends of the second fuse 110 pass through the second arc extinguishing chamber and are connected in parallel with the second busbar 108.

[0042] Filling holes are respectively formed in the first cover plate and the second cover plate for filling arc extinguishing medium into the arc extinguishing chamber, and the filling holes are sealed with plugs.

[0043] The resistances of the first fuse element 109 and the second fuse element 110 are much greater than those of the first current-carrying busbar 107 and the second current-carrying busbar 108. When conducting current normally, most of the current flows through the first current-carrying busbar 107 and the second current-carrying busbar 108, and only a weak current flows through the first fuse element 109 and the second fuse element 110.

[0044] In use, the first current-carrying busbar 107 and the second current-carrying busbar 108 are respectively connected to a path, so that the excitation fuse is simultaneously connected to two paths. When used in a three-phase circuit, two-phase circuits are simultaneously connected, and the simultaneous on-off of the two-phase circuits is controlled.

[0045] Working principle:

[0046] During normal operation, the first current-carrying busbar 107 and the second current-carrying busbar 108 are respectively connected to a circuit.

[0047] The electronic ignition device 105 acts according to the received trigger signal, releases high-pressure gas as the driving force, the high-pressure gas acts on the piston 106, disconnects the piston 106 and the limit lug 106c, drives the piston 106 to displace along the cavity of the first housing 102, and the first impact end 106a and the second impact end 106b of the piston 106 simultaneously disconnect the first current-carrying busbar 107 and the second current-carrying busbar 108. The current flowing through the first current-carrying busbar 107 and the second current-carrying busbar 108 then flows through the first fuse element 109 and the second fuse element 110 connected in parallel therewith, and the first fuse element 109 and the second fuse element 110 are fused.

[0048] Arc extinguishing principle:

[0049] The first current-carrying busbar 107 and the second current-carrying busbar 108 are simultaneously disconnected. Since most of the current flows through the first fuse element 109 and the second fuse element 110 when disconnected, the arc is very small when the first current-carrying busbar 107 and the second current-carrying busbar 108 are disconnected. When the first fuse element 109 and the second fuse element 110 are fused, due to the current-limiting effect of the first fuse element 109 and the second fuse element 110, the arc generated during fusing is relatively small, and the arc is directly extinguished through the arc extinguishing medium.

[0050] In some embodiments, the distances between the impact ends of the piston corresponding to the current-carrying busbars and the current-carrying busbars can be different, so that the piston can disconnect the current-carrying busbars successively. However, it should be noted that the displacement distance space of the piston after the first-disconnected current-carrying busbar is disconnected must be satisfied.

[0051] In some embodiments, the misalignment setting can also be achieved through the combination of the necking structure and the groove structure, such as Figure 9, on the first conductive row closest to the electronic ignition device, in addition to the narrow neck structure 107a being provided, a groove 107b is also provided on one side in the width direction of the first conductive row 107. The narrow neck structure 108a of the second conductive row 108 is provided facing the groove 107b of the first conductive row 107. The impact end of the piston passes through the groove 107b of the first conductive row and is arranged facing the narrow neck structure 108a of the second conductive row, realizing the dislocation of the narrow neck structures of the first conductive row 107 and the second conductive row 108.

[0052] For the excitation fuse of the present invention, the first conductive row and the second conductive row are arranged opposite to each other at intervals, and then are arranged in a dislocation manner in the housing through the narrow neck structure, cooperating with the two impact ends of the piston, so that the first conductive row and the second conductive row are simultaneously disconnected by the piston and do not interfere with each other. For the excitation fuse of the present invention, through the orthographic projection parts of the conductive rows located inside the housing overlapping and then the narrow neck structures being arranged in a dislocation manner, and enabling each impact end of the piston to be arranged facing the narrow neck structure of each conductive row, the impact end of the piston can disconnect each conductive row, realizing the disconnection of the main circuit. The space is saved by the overlapping of the orthographic projection parts of the conductive rows, reducing the volume of the product.

[0053] A fuse body in parallel with the conductive row is arranged on the outer periphery of the piston displacement path, making full use of the space between the outer periphery of the piston displacement path and the outer wall of the housing. Through the design of the conductive row and the fuse body, the structure of the excitation fuse is more compact and the volume is smaller.

Claims

1. An excitation fuse structure provided with multiple conductive buses, characterized in that, It includes a housing, an electronic ignition device located in the housing, a piston, two or more conductive bars insulated and spaced along the displacement direction of the piston, a fuse is connected in parallel on each conductive bar, and the fuses are insulated from each other; the piston is provided with impact ends corresponding to each of the conductive bars, and the conductive bar parts inside the housing that need to be disconnected by the piston are arranged in a staggered manner, and the orthographic projection parts of each conductive bar overlap, and the conductive bar parts of each conductive bar that need to be disconnected by the piston are arranged in a narrow-neck structure; the lengths of the impact ends in the piston displacement direction are different; when the electronic ignition device releases a driving force to drive the piston to displace, the piston disconnects each conductive bar simultaneously or successively, and the fuses connected in parallel with the conductive bars are fused.

2. The excitation fuse structure provided with multiple conductive bars according to claim 1, characterized in that The conductive bar parts inside the housing that need to be disconnected by the piston are all arranged in a narrow-neck structure, the narrow-neck structures of each conductive bar are arranged in a staggered and insulated manner, and the impact ends of the piston are respectively arranged corresponding to the narrow-neck structures.

3. The structure of the excitation fuse with multiple conductive bars as claimed in claim 2, wherein A groove is provided on at least one side in the width direction of the conductive bar closest to the electronic ignition device, the narrow-neck structures of the remaining conductive bars are arranged opposite to the groove and in a staggered manner, and the orthographic projections of the narrow-neck structures of the conductive bars opposite to the groove do not overlap, and the corresponding impact ends of the piston can pass through the groove to disconnect the narrow-neck structures of the remaining conductive bars.

4. The excitation fuse structure with multiple conductive buses according to claim 3, characterized in that The conductive bar includes a first conductive bar and a second conductive bar arranged opposite and spaced apart, the first conductive bar is arranged close to the electronic ignition device, the narrow-neck structure and the groove are arranged at intervals along the length direction on the first conductive bar, the narrow-neck structure of the second conductive bar is arranged opposite to the groove of the first conductive bar, and the narrow-neck structures of the first conductive bar and the second conductive bar are arranged in a staggered manner.

5. The exciting fuse structure with multiple conductive bars according to claim 2, characterized in that, The conductive bar includes a first conductive bar and a second conductive bar arranged opposite and spaced apart, a first fuse connected in parallel on the first conductive bar, and a second fuse connected in parallel on the second conductive bar, and the first fuse and the second fuse are insulated from each other; the parts of the first conductive bar and the second conductive bar inside the housing that need to be disconnected are arranged in a narrow-neck structure, and the narrow-neck structures on the first conductive bar and the second conductive bar are arranged in a staggered and insulated manner in the direction perpendicular to the piston displacement path; the piston is provided with a first impact end and a second impact end arranged in a staggered manner, and the lengths of the first impact end and the second impact end in the piston displacement direction are different; the first impact end is arranged corresponding to the narrow-neck structure of the first conductive bar, and the second impact end is arranged corresponding to the narrow-neck structure of the second conductive bar.

6. The excitation fuse structure with multiple conductive bars as claimed in claim 5, wherein, Two arc extinguishing chambers filled with arc extinguishing medium are arranged at intervals in the middle of the housing along the piston displacement direction on the outer periphery of the piston displacement path, and the first fuse and the second fuse respectively pass through one of the arc extinguishing chambers close to them.

7. The excitation fuse structure with multiple conductive bars according to claim 6, characterized in that, The housing includes an electronic ignition device protective sleeve, a first housing, a second housing, and a third housing arranged in sequence. The first conductive busbar is disposed between the first housing and the second housing, and the second conductive busbar is disposed between the second housing and the third housing. The arc extinguishing chambers are respectively located in the first housing and the third housing. The first fuse is disposed in the arc extinguishing chamber in the first housing, and the second fuse is disposed in the arc extinguishing chamber in the third housing.

8. The excitation fuse structure with multiple conductive bars according to claim 7, characterized in that, On the end faces of the first housing and the third housing facing the electronic ignition device, accommodation grooves are respectively provided. The accommodation grooves are respectively sealed by covers to form the arc extinguishing chambers. The first fuse is disposed in the arc extinguishing chamber in the first housing, and the second fuse is disposed in the arc extinguishing chamber in the third housing.

9. The structure of the excitation fuse with multiple conductive bars as claimed in claim 7, wherein, The arc extinguishing chamber is of an arc-shaped structure, and the first fuse and the second fuse are of arc-shaped filament structures matching the arc extinguishing chamber.

10. The excitation fuse structure with multiple conductive buses according to claim 7, characterized in that The piston is in sealed contact with the first housing. The end faces of the first impact end and the second impact end of the piston are of notch structures. When the first impact end and the second impact end respectively break the first impact end and the second impact end, the notch structures respectively straddle the width direction of the neck structures of the first conductive busbar and the second conductive busbar, so that the neck structures are respectively located in the notches corresponding to the first impact end and the second impact end.

11. The excitation fuse structure provided with a multi-way busbar according to claim 1, characterized in that, An electrostatic ring is provided at the signal receiving end of the electronic ignition device.

12. The excitation fuse structure provided with a multi-way conductive bar according to claim 7, characterized in that, Sealing rings are provided between the contact surfaces of the electronic ignition device protective sleeve, the first housing, the second housing, and the third housing in contact, and silicone is filled for sealing.

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