An array-type multi-break excitation fuse

Abstract

An array-type, multi-break excitation fuse includes a housing, a conductive plate disposed within the housing, an excitation device, and a breaking device. The conductive plate surfaces within the housing are arranged into an array-like lattice structure by crisscrossing multiple weak points of disconnection. The breaking device includes a first cutting punch and a second cutting punch, with the first cutting punch being closer to the conductive plate than the second cutting punch. When the excitation device drives the breaking device to cut the conductive plate, the first cutting punch forms at least one first break in the conductive plate, forming a conductive current flow path with increased loop length or resistance in the conductive plate lattice structure. The current flow path includes at least two pre-breaks connected in series. The second cutting punch breaks the pre-breaks in the current flow path to form at least two second breaks. The excitation fuse of the present invention improves both breaking capacity and arc extinguishing capability.

Description

Technical Field

[0001] The invention relates to the fields of power control and electric vehicles, and in particular to an excitation fuse for a current breaking method in which multiple breaks are formed on a conductive plate. Background Art

[0002] In addition to traditional thermal fuses, electric vehicle battery pack protection devices now include excitation fuses that quickly and mechanically cut the fuse element. These fuses are now being used to protect the battery packs of electric vehicles. These excitation fuses are designed to overcome the shortcomings of traditional fuses, such as high power consumption, high heat generation, large size and weight, limited resistance to current surges, long disconnection times, and uncontrolled disconnection processes. The general structure of an excitation fuse consists of an electronic ignition device, a piston, a conductive plate with a pre-broken opening, and an outer shell. The electronic ignition device receives an excitation signal, generating high-pressure gas that drives the piston, which then cuts the conductive plate to create a physical break, thereby disconnecting the fuse. The arc generated by the physical break gradually cools and extinguishes in the air, cutting off the current and achieving the purpose of quickly disconnecting the circuit.

[0003] Although this structure has some improvements over the thermal cutoff, it also has the following shortcomings:

[0004] A single fault has insufficient arc extinguishing capacity to interrupt smaller fault currents, but struggles to interrupt larger ones. The larger the arc current, the harder it is to extinguish. All arcs are concentrated on a single fault, heating the conductive plate and the air, leading to arc persistence and making it difficult to extinguish.

[0005] Due to the limitations of the conductive plate and the limited space available for movement, it's difficult to design a larger break, resulting in a limited voltage withstand capability for a single break. While a single break can effectively break at lower voltages (e.g., 500V), it's significantly insufficient at higher voltages, making it difficult to effectively break.

[0006] To effectively break the conductive plate, the width of the pre-break must be narrow for quick severing. Consequently, the continuous current carrying capacity of the pre-break is limited. For example, the continuous current carrying capacity of a single pre-break is only 400A, making it difficult to continuously carry higher currents. Summary of the Invention

[0007] The object of the present invention is to provide an array-type multi-break excitation fuse, which is arranged in an array and in a grid shape on a conductive plate, and multiple breaks are formed on the conductive plate through secondary cutting, so as to improve the breaking capacity and arc extinguishing capacity of the excitation fuse.

[0008] To achieve the above-mentioned objectives, the technical solution provided by the present invention is an array-type multi-break excitation fuse, comprising a shell, a conductive plate passing through the shell, an excitation device and a breaking device located on one side of the conductive plate and arranged in the shell cavity, and a cavity located on the other side of the conductive plate corresponding to the cutting punch on the breaking device, characterized in that the surface of the conductive plate is arranged into an array-like lattice structure by a plurality of criss-crossing breaking weak points on both surfaces of the conductive plate in the shell; the cutting punch of the breaking device comprises a first cutting punch and a second cutting punch, the first cutting punch being closer to the conductive plate than the second cutting punch; when the excitation device drives the breaking device to cut the conductive plate, the first cutting punch first forms at least one first break at the conductive plate in the lattice structure, and forms a conductive current flow path with a loop increase or increased resistance at the lattice structure of the conductive plate, the current flow path comprising at least two pre-breaks connected in series; the second cutting punch breaks the pre-breaks on the current flow path to form at least two second breaks.

[0009] Furthermore, a melt is connected in parallel on one side of the first fracture formed on the conductive plate. When the first fracture formed by the first cutting punch on the conductive plate completely disconnects the conductive plate, a conductive current flow path with a loop growth or increased resistance is formed at the lattice structure of the conductive plate, and the current flow path includes the melt.

[0010] Furthermore, the conductive plate located in the shell is divided into at least one first melt part and a second melt part arranged in parallel by disconnecting the weak part, and the thickness of the first melt part is greater than that of the second melt part; the first melt part and the second melt part are arranged in an array-like lattice structure by disconnecting the weak part; when the excitation device drives the breaking device to cut the conductive plate, the first cutting punch first forms at least one first fracture at the first melt part to disconnect the first melt part; the second cutting punch disconnects the second melt part to form at least two second fractures in series.

[0011] Furthermore, the lattice structure on the conductive plate is arranged in at least a 2*2 array.

[0012] Furthermore, the bottom of the conductive plate portion that is not broken by the first cutting punch and the second cutting punch of the breaking device is supported by a plurality of support columns provided on the shell.

[0013] Furthermore, the cutting punch of the breaking device and the corresponding cavity below the conductive plate are interference fit.

[0014] Furthermore, the shell includes two independent parts located on both sides of the conductive plate, and the excitation device and the interruption device are sequentially arranged in the shell part located on one side of the conductive plate.

[0015] Furthermore, the excitation device is in sealed contact with the cavity in the housing portion where it is located.

[0016] Furthermore, a groove is provided on an end surface of the breaking device adjacent to the excitation device, and the driving force released by the excitation device acts on the groove.

[0017] Furthermore, the lattice structure on the conductive plate is arranged in a triangular array, a circular array, a rectangular array or a polygonal array.

[0018] Furthermore, the structural shape setting of the first cutting punch of the breaking device only needs to be able to form an elongated conductive current flow path or a conductive current flow path with increased resistance on the conductive plate, and retain at least two pre-breaks in series on the current flow path.

[0019] Furthermore, the structural shape of the second cutting punch of the breaking device only needs to be able to completely cut off the conductive plate and form at least two fractures on the conductive plate.

[0020] Furthermore, the lattice-like structure arranged in a circular array on the conductive plate comprises two hollow arc structures disposed opposite each other near the two sides of the conductive plate, a hollow structure disposed between the two hollow arc structures, and two arc-shaped conductive channels formed between the hollow structure and the two hollow arc structures. A lattice is disposed on the conductive plate near the side of the hollow arc structure, with disconnection points disposed at both ends of the lattice; and a plurality of disconnection points are spaced apart on the arc-shaped conductive channels.

[0021] The advantages of the multi-break excitation fuse of the present invention over the traditional excitation fuse are:

[0022] An array of multiple pre-breaks is used on the conductive plate. When the current is flowing normally, the multiple pre-breaks are connected in parallel and then in series, which can effectively reduce the resistance at the pre-breaks, reduce heat generation, and improve the normal current carrying capacity.

[0023] The use of multiple array-type pre-fractures on the conductive plate can increase the number of fractures in a smaller volume, greatly increasing the material utilization rate on the conductive plate and thus saving costs.

[0024] The use of multiple pre-breaks in an array on the conductive plate can reduce the volume of the entire product compared to the ordinary series multi-break method.

[0025] By first opening a portion of the breakers in a preset pattern, the current path is altered, causing the current to flow through multiple series-connected breakers. This lengthens the path and increases resistance, reducing the fault current flowing through it. The remaining breakers are then opened. Because the remaining breakers are connected in series and are cut simultaneously, the voltage applied to each break is reduced to only 1 / nth of that of a single breaker (n is the number of breakers). This reduces the arc voltage across the breakers, making it easier to cool the arc and interrupt it. The resulting insulation performance is better than that of a single breaker, allowing it to interrupt fault currents of higher voltage levels.

[0026] By connecting an arc-extinguishing fuse in parallel at the first break, the fault current can be effectively reduced and the ability to interrupt large fault currents can be further improved.

[0027] The combination of multi-break breaking and extrusion arc extinguishing can extinguish arc quickly and break reliably, thus improving the breaking capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 , a schematic diagram of the side sectional structure of the present invention.

[0029] Figure 2 ,and Figure 1 Schematic diagrams of different side cross-sectional structures.

[0030] Figure 3 , schematic diagram of the three-dimensional structure of the conductive plate.

[0031] Figure 4 , a schematic diagram of the three-dimensional structure of the first cutting punch of the piston in an L-shaped structure.

[0032] Figure 5 ,correspond Figure 4 Schematic diagram of the structure of the conductive plate after the first cutting punch of the piston structure cuts off the conductive plate for the first time.

[0033] Figure 6 ,correspond Figure 4 The piston structure, Figure 5 A schematic structural diagram of the conductive plate after the second cutting punch cuts the conductive plate for the second time based on the conductive plate.

[0034] Figure 7 , a schematic diagram of the structure after the conductive plate is completely disconnected after two cuts, with the shadows of the first and second fractures removed.

[0035] Figure 8 , when the first cutting punch of the piston is in a parallel I-shaped structure with intervals and offsets, a structural schematic diagram of the conductive plate after the first cutting is performed on the conductive plate.

[0036] Figure 9 ,exist Figure 8Based on the above, a schematic structural diagram of the conductive plate after the second cutting punch cuts the conductive plate for the second time after the conductive plate is completely disconnected.

[0037] Figure 10 , when the first cutting punch of the piston is in a T-shaped structure with a relative offset arrangement, the conductive plate is completely disconnected after the first cutting is performed on the conductive plate, and a parallel melt is connected to one end of the first fracture of the conductive plate, so that after the conductive plate is completely cut off for the first time, the conductive plate is still kept conductive through the parallel melt. Schematic diagram of the structure.

[0038] Figure 11 ,exist Figure 10 Based on the above, a schematic structural diagram of the conductive plate after the second cutting punch cuts the conductive plate for the second time after the conductive plate is completely disconnected.

[0039] Figure 12 , when the first cutting punch of the piston is in a parallel and staggered I-shaped structure, the conductive plate is completely disconnected after the first cutting on the conductive plate, and a parallel melt is connected at one end of the first fracture of the conductive plate, so that after the conductive plate is completely cut off for the first time, the conductive plate is still kept conductive through the parallel melt. Schematic diagram of the structure.

[0040] Figure 13 ,exist Figure 12 Based on the above, a schematic structural diagram of the conductive plate after the second cutting punch cuts the conductive plate for the second time after the conductive plate is completely disconnected.

[0041] Figure 14 , a side sectional structural diagram showing that the excitation device and the piston are respectively located in different housings.

[0042] Figure 15 , Figure 10 The structure shown is a schematic diagram of a side sectional view from another side.

[0043] Figure 16 , a structural schematic diagram of at least two melt parts with inconsistent thicknesses arranged in parallel on a conductive plate.

[0044] Figure 17 , a lattice structure arranged in a triangular array on the conductive plate.

[0045] Figure 18 , a lattice structure arranged in a circular array on the conductive plate. DETAILED DESCRIPTION

[0046] With respect to the above technical solution, preferred implementations are now cited and specifically described with reference to the accompanying drawings.

[0047] The array type multi-break excitation fuse of the present invention includes a housing, which can be composed of two parts, upper and lower, or left and right. In this embodiment, the upper and lower parts are used as an example for description. Figure 1 and Figure 2The housing consists of an upper housing 1 and a lower housing 2. A conductive plate 3 is inserted between the upper and lower housings, and both ends of the conductive plate 3 are located outside the housing and can be connected to an external circuit. A cavity is provided in the upper housing above the conductive plate, and an excitation device 4 and an interruption device 5 are provided in the cavity from top to bottom. Several cavities are provided in the lower housing below the conductive plate. The interruption device can interrupt the conductive plate 3 to form multiple fractures when driven by the excitation device, and the multiple broken conductive plate parts fall into the corresponding cavities when driven by the interruption device.

[0048] In the upper shell 1, a limiting step is provided in the cavity where the excitation device 4 is located, and the excitation device 4 is provided at the limiting step in the cavity. Figure 1 and Figure 2 (not shown) is pressed against the upper housing to secure the excitation device 4. Excitation device 4 can receive an external excitation signal to initiate the release of the driving force. In this embodiment, excitation device 4 is an electronic ignition device. A sealing ring is provided between the electronic ignition device and the cavity of the upper housing to prevent gas from leaking upward during release, which could impact the excitation device and the external structures of the fuse, causing unnecessary damage. Based on the excitation signal it receives, such as a voltage signal, ignition triggers the reaction of the internally stored gunpowder, instantly releasing a large amount of high-pressure gas, which drives the interrupter device to displace and impact the conductive plate.

[0049] The cavity housing the interrupter 5, located below the excitation device 4, has vertical guide grooves on opposite sides. In this embodiment, the interrupter 5 is a piston. Ribs 501 are located on opposite sides of the piston 5, positioned within the guide grooves to facilitate smooth piston movement. The piston and cavity have either an interference fit or a small clearance fit. In the case of a small clearance fit, the clearance must be large enough to allow the high-pressure gas released by the electronic ignition device to drive the piston to disconnect the conductive plate and displace to its dead center position within the lower housing.

[0050] A groove 502 is provided on the top of the piston, and the electronic ignition device is located directly above the groove 502 to ensure that the high-pressure gas released by the electronic ignition device can act on the groove 502 on the piston, so that the force on the piston is more concentrated and the driving effect is better.

[0051] A limiting structure (not shown) is also provided at the contact surface between the piston and the cavity. The limiting structure can be a small bump provided on the side wall of the piston and a small groove provided at a corresponding position in the cavity. The small bump is embedded in the small groove to achieve the initial position of the limiting piston. This ensures that the piston can be located at the initial position when not driven by the excitation device and will not accidentally move and impact the conductive plate. In addition to the limiting structure of the piston in the cavity that combines a small bump and a small groove, the small bump can also be made into a barb structure, and the barb and groove are combined to achieve limiting.

[0052] Conductive plate 3, see Figure 3The conductive plate has a flat structure. At least two limiting protrusions 300 are spaced apart on one side of the conductive plate where the upper and lower shells meet. A corresponding limiting groove is provided on the lower shell. When the conductive plate is inserted between the upper and lower shells, the limiting protrusions on the side of the conductive plate are locked in the limiting grooves on the lower shell to limit the position and prevent mis-installation. To achieve the conductive plate limit, grooves can also be provided on the side of the conductive plate, and protrusions can be provided on the end surface of the lower shell or the upper shell. To better prevent mis-installation, the conductive plate limit can also be designed with protrusions or grooves of different shapes to form an asymmetric structure.

[0053] The conductive plate portion located in the shell is divided into a grid-like structure arranged in an array of multiple rows and columns by a plurality of parallel crisscross disconnected weak points 301 correspondingly opened on its upper and lower surfaces, and adjacent grids are separated by disconnected weak points. Among them, the bottoms of the grids 303 in the odd rows in the even columns are supported by support columns 201 provided in the lower shell, and the bottoms of the unsupported grids are cavities, and the adjacent cavities are interconnected. In order to reduce the weight of the conductive plate, the grids 304 in the even rows in the odd columns of the conductive plate are spaces. The disconnected weak points 301 are V-shaped grooves, and can also be U-shaped grooves or trapezoidal grooves. The grids whose bottoms are not supported by the support columns of the lower shell can be used as pre-fractures. In this specification, the grid-like structure of the conductive plate lists a rectangular array arrangement, and can also be a triangular array, see Figure 17 This is a schematic diagram of a triangular array structure. The grids 312 on the conductive plate are separated by disconnected weak points 310 and hollow grids 311 to form a triangular array arrangement. When at least one of the grids 312 is disconnected, a conductive current flow path with increased loop length or resistance can be formed. It can also be a circular array, see Figure 18 Two hollow arc structures 320 are provided on the conductive plate near the two sides, and a hollow structure 321 is provided between the two hollow arc structures. Two arc-shaped conductive channels 322 are formed between the hollow structure 321 and the two hollow arc structures 320. A grid 323 is provided on the conductive plate near the side of the hollow arc structure, and a disconnection weak point 324 is provided at both ends of the grid. The disconnection weak point 324 is a groove. A plurality of disconnection weak points 325 are provided at intervals on the arc-shaped conductive channel 322. The disconnection weak points 325 are a plurality of through holes arranged in a row at intervals. The thickness of the arc-shaped conductive channel 322 can be thinner than the thickness of the conductive plate itself. When the first cutting punch disconnects the two grids 323 to form two first fractures, a conductive current flow path with increased resistance can be formed, namely the arc-shaped conductive channel 322. Then, under the action of the second cutting punch, at least two second fractures are formed on the arc-shaped conductive channel 322 to disconnect the conductive plate. The lattice structures on the conductive plate can also be arranged in a polygonal array.

[0054] Piston 5, see Figure 1 、 Figure 2 and Figure 4 A first cutting punch 503 and a second cutting punch 504 are provided on the end face of the piston that impacts the conductive plate. The first cutting punch 503 is two L-shaped structures that are relatively staggered, and the second cutting punch 504 is a plurality of square columnar structures that are spaced apart; cavities (202, 203) corresponding to the shapes and positions of the first cutting punch and the second cutting punch are provided on the lower shell, and the depth of the cavity 202 corresponding to the first cutting punch is the same as or greater than the depth of the cavity 203 corresponding to the second cutting punch. The first cutting punch and the second cutting punch are interference fit with the cavity in the lower shell directly below them. The distance between the first cutting punch and the conductive plate is shorter than the distance between the second cutting punch and the conductive plate, that is, when the piston impacts and cuts the conductive plate, the first cutting punch first acts on the conductive plate to cut off a part of the weak part, and the second cutting punch then acts on the conductive plate to completely disconnect it. After the first cutting punch cuts off part of the conductive plate, the conductive plate is in an undisconnected state, but after being cut by the first cutting punch, see Figure 5 The first cutting punch 503 forms a first fracture 305 on the conductive plate. The first fracture has an L-shaped fracture structure. The unbroken portion of the conductive plate located inside the shell has a bow-shaped structure, which lengthens the path of the current flowing through the conductive plate inside the shell, increases the resistance of the conductive plate inside the shell, reduces the fault current flowing through the conductive plate, and realizes the first layer of protection. At the same time, multiple unbroken series pre-fractures are retained on the bow-shaped path of the current. The first cutting punch drives the broken portion of the conductive plate into the corresponding cavity 202 located in the lower shell. The first fracture of the L-shaped fracture structure is also the transverse cross-sectional structure of the first cutting punch of the piston; the multiple fracture structure formed on the conductive plate by the second cutting punch is also the transverse cross-sectional structure of the second cutting punch of the piston.

[0055] Then the second cutting punch cuts off the pre-breaks connected in series on the current flow path of the bow-shaped structure formed on the conductive plate, that is, the grids on the current flow path of the bow-shaped structure that are not supported by the shell support column, see Figure 6 , forming a total of 10 square second fractures 306 on the conductive plate, achieving complete disconnection of the conductive plate. After being cut twice by the first cutting punch and the second cutting punch, the structure of the conductive plate after complete disconnection is shown in FIG. Figure 7. Each square columnar impact end of the second cutting punch corresponds to a grid of the uncut portion of the first cutting punch that is not supported by the shell support column. Since the second cutting punch can form multiple second breaks in series when cutting the conductive plate, the voltage generated at each second break is 1 / n of the single break, where n is the number of breaks, thereby reducing the arc voltage at each break, making the arc easier to cool and easier to cut off. As the piston continues to move downward, the second cutting punch drives each disconnected conductive plate portion into the cavity 203. Since the second cutting punch has an interference fit with the cavity 203, it can squeeze the arc generated at the second break and extinguish it quickly. When the first cutting punch of the piston disconnects part of the conductive plate, the current can be reduced; the second cutting punch forms multiple breaks on the conductive plate to reduce the arc voltage and extinguish the arc quickly. Therefore, the multiple breaks formed by the conductive plate of the present invention have better insulation performance than a single break and can disconnect fault currents of higher voltage levels.

[0056] In this embodiment, the first cutting punch is an L-shaped structure. According to the need, the first cutting punch can also be a straight-line structure or other structures arranged in parallel and staggered. The shape of the first cutting punch satisfies the condition that after the conductive plate is cut for the first time, Figures 8 and 9 , forming a first fracture 307 with spaced and staggered parallel edges on the conductive plate, the first fracture 307 is a plurality of spaced and staggered parallel I-shaped fracture structures, forming an elongated current flow path on the conductive plate, and the elongated current flow path includes a plurality of pre-fractures in series; the second cutting punch and Figure 4 The structure is similar to that in the figure, also consisting of several spaced-apart square pillars. After the first cutting punch cuts the conductive plate, the second cutting punch subsequently cuts through the multiple pre-cuts connected in series along the elongated current path, forming a second fracture 308. The second fracture comprises multiple fractures connected in series. The structure of the first fracture 307 formed also represents the transverse cross-sectional structure of the first cutting punch of the piston. The structure of the second fracture formed on the conductive plate by the second cutting punch also represents the transverse cross-sectional structure of the second cutting punch of the piston. Figure 8 and Figure 9 After the secondary cutting, the conductive plate is completely broken, the shape of the conductive plate is the same as Figure 7 same.

[0057] In addition to the relatively arranged L-shaped structure and the spaced-apart I-shaped structure, the shape of the first cutting punch only needs to be able to form an elongated current flow path on the conductive plate and retain multiple pre-breaks in series on the current flow path.

[0058] Figures 3 to 9In the structure, after the first cutting punch of the piston cuts off part of the grid of the conductive plate, the conductive plate is still in a conductive state, but after the cutting action of the first cutting punch, the conductive part of the conductive plate located in the shell is made into a bow-shaped structure, which lengthens the length of the current flowing through the conductive plate, and there are multiple pre-breaks in series in the conductive path of the bow-shaped structure; after the second cutting punch cuts, the multiple pre-breaks in series in the conductive path of the bow-shaped structure are disconnected, forming multiple breaks, and completely disconnecting the conductive plate.

[0059] It is also possible to completely cut the conductive plate for the first time by using the first cutting punch, and then set a parallel fuse on one side of the conductive plate fracture to connect the conductive plates at the fracture to make it conductive, so that the conductive plate part located in the shell is in a conductive bow-shaped structure, which lengthens the length of the current flowing through the conductive plate, and there are multiple series pre-breaks in the conductive path of the bow-shaped structure; after being cut by the second cutting punch, the multiple series pre-breaks in the conductive path of the bow-shaped structure are disconnected to form multiple fractures, and the conductive plate is completely disconnected; at the same time as the second cutting punch disconnects the conductive plate, the parallel fuse melts to increase the number of fractures.

[0060] Specifically, see Figure 10 and 11 The transverse cross-section of the first cutting punch of the piston is two T-shaped structures that are relatively staggered. After the first cutting punch cuts off the conductive plate, a first fracture 80 is formed in the array structure of the conductive plate. The first fracture 80 is a T-shaped fracture structure, which cuts off the two ends of the grid-like structure of the array of conductive plates arranged in the shell, completely cuts off the conductive plate, and forms a continuous bow-shaped path between the two oppositely arranged first fractures 80, and the bow-shaped path contains multiple series pre-fractures. At one end of the first fracture on different sides, fuses 81 and 82 are connected in parallel. Through fuses 81 and 82, the bow-shaped path between the two T-shaped fracture structures is connected to the two ends of the conductive plate, forming a bow-shaped conductive path, lengthening the current flow path, increasing the resistance of the current flow path, and thus reducing the fault current flowing through the bow-shaped path; due to the presence of the parallel fuses, most of the fault current flows through the fuses, so the arc at the T-shaped fracture structure is very small. In addition, the first cutting punch and the cavity in the lower shell are interference fit, so it is easy to extinguish the arc by stretching and squeezing the arc. After the first cutting punch cuts the conductive plate, the piston continues to drive the broken part of the conductive plate to move downward in the corresponding cavity in the lower shell, see Figure 11 The second cutting punch cuts off multiple pre-breaks in the bow-shaped conductive path to form a second break 83. The second break 83 includes multiple series-connected breaks. When the fault current is not enough to cause the fuse to melt, the fuse will not melt. When the fault current is large enough, the parallel fuses will also melt.

[0061] See Figures 12 to 13The first cutting punch is a straight-line structure arranged in parallel at intervals. The conductive plate is cut by the first cutting punch to form a plurality of first breaks 90, and a straight-line conductive path is formed between adjacent first breaks. A fuse 91 is connected in parallel on the opposite side of the two adjacent first breaks, and all the straight-line conductive paths between the adjacent first breaks are connected to the two ends of the conductive plate to form an elongated bow-shaped conductive path. The bow-shaped conductive path contains a plurality of pre-breaks connected in series. After the first cutting punch cuts the conductive plate, a bow-shaped conductive path is formed; due to the existence of the parallel fuse, the conductive plate is still in a conductive state; then the second cutting punch continues to move downward to cut off the plurality of pre-breaks in the bow-shaped conductive path to form a second break 92, and the second break 92 contains multiple breaks. When the fault current is not enough to cause the fuse to melt, the fuse will not melt. When the fault current is large enough, the parallel fuse will also melt.

[0062] In the above embodiment, whether the first shearing punch of the piston completely breaks the conductive plate depends on the structure of the first shearing punch. Regardless of whether the first shearing punch breaks the conductive plate, the second shearing punch must break the conductive plate to form a multi-fracture structure. Furthermore, the first and second shearing punches may have an interference fit or a non-interference fit in the corresponding cavities of the lower housing.

[0063] The conductive plates are arranged in an array, and the conductive plates located in the housing are at least arranged in a grid-like array of 2 rows and 2 columns, or can be arranged in a multi-row and multi-column array.

[0064] In the above embodiment, a single excitation device and a corresponding interrupting device are used to interrupt the array of conductive plates. Alternatively, one, two, or more excitation devices can be used to separately or time-share drive the corresponding interrupting devices, creating more breaks in a larger array of conductive plates and further enhancing the interrupting capability.

[0065] exist Figure 1 and Figure 2 In the embodiment, the upper housing portion for mounting the excitation device and the upper housing portion for mounting the piston are integrally formed structures, which can also be divided into separate structures, see Figure 14 and Figure 15 The upper shell includes a middle shell 70 with a cavity, a top shell 71, and a cover plate 72 arranged on the outer periphery of the top shell. A circle of grooves is provided on the upper end surface of the outer side of the cavity of the middle shell, and a circle of corresponding ridges is provided on the lower end surface of the top shell. The ridges of the top shell are embedded in the mounting grooves of the middle shell to seal the top shell and the middle shell. The piston 5 is installed in the cavity of the middle shell, and the excitation device 4 is installed in the cavity of the top shell. A sealing ring 73 is provided between the excitation device and the cavity of the top shell. A cover plate 72 is pressed on the outer periphery of the top shell for fixing the excitation device, and the cover plate is fixed to the middle shell by screws. Figure 14 and Figure 1Structural difference: The upper shell consists of two parts plus a cover plate. Figure 1 The upper shell in the middle is an independent part with a cover plate, and the rest of the structure is the same.

[0066] See Figure 16 The conductive plate 3 in the housing can also be divided into at least one first melt portion 93 and a second melt portion 94 arranged in parallel by disconnecting the weak portion, and the thickness of the first melt portion is greater than that of the second melt portion. Figure 16 In the embodiment, the first melt part and the second melt part are separated and arranged in parallel by long strip-shaped through holes, or separated and arranged in parallel by grooves, and the groove shape of the weak point is V, U or trapezoidal structure. There are two second melt parts. The first melt part and the second melt part are arranged in an array-like grid structure by breaking the weak point. Figure 16 In the embodiment, the disconnection weak point 95 on the first melt portion is a V-shaped groove structure, while the disconnection weak point 96 on the second melt portion is a continuously spaced small hole structure, which can also be a groove structure. By providing the disconnection weak points on the first and second melt portions, at least two pre-fractures connected in series can be formed on the second melt portion, and at least one pre-fracture can be formed on the first melt portion. The structure of the cutting punch of the interrupting device corresponds to the structure of the conductive plate. The first cutting punch only cuts through the pre-fractures of the first melt portion, forming at least one first fracture, completely severing the first melt portion. The second cutting punch of the interrupting device only cuts through the multiple pre-fractures connected in series on the second melt portion, forming multiple second fractures connected in series on the second melt portion. Because the second melt portion is thinner than the first melt portion, after the first melt portion is disconnected, conduction occurs through the second melt portion, increasing the resistance of the current passing through the conductive plate, reducing the fault current. The second cutting punch then cuts through multiple second fractures connected in series, sharing the voltage and improving the breaking and arc extinguishing capabilities.

Claims

1. An array-type multi-break energized fuse comprising a housing, a conductive plate extending through the housing, an energizing device and a breaking device located on one side of the conductive plate and disposed in a cavity of the housing, and a cavity located on the other side of the conductive plate corresponding to a shearing punch on the breaking device, characterized in that: The conductive plate inside the housing is provided with a grid structure on both surfaces thereof by a plurality of crisscrossing weak points of disconnection; the cutting punch of the interrupting device includes a first cutting punch and a second cutting punch, wherein the first cutting punch is closer to the conductive plate than the second cutting punch; When the excitation device drives the breaking device to cut the conductive plate, the first cutting punch first breaks at least one grid on the conductive plate of the lattice structure to form at least one first fracture, thereby changing the shape of the current flow path, forming a conductive current flow path with a longer loop or increased resistance at the lattice structure of the conductive plate, and the changed current flow path includes at least two pre-fractures connected in series; Then, the second cutting punch breaks the pre-break on the changed current flow path to form at least two second breaks.

2. The array-type multi-break excitation fuse according to claim 1, characterized in that A melt is connected in parallel on one side of the first fracture formed on the conductive plate. When the first fracture formed by the first cutting punch on the conductive plate completely disconnects the conductive plate, a conductive current flow path with a loop growth or increased resistance is formed at the lattice structure of the conductive plate, and the current flow path includes the melt.

3. The array-type multi-break excitation fuse according to claim 1, characterized in that The conductive plate located in the housing is divided into at least one first melt portion and a second melt portion arranged in parallel by disconnecting a weak portion, wherein the thickness of the first melt portion is greater than that of the second melt portion; The first melt portion and the second melt portion are provided with a lattice structure arranged in an array by breaking weak points; When the excitation device drives the breaking device to cut the conductive plate, the first cutting punch first forms at least one first fracture at the first melt portion to cut off the first melt portion; The second cutting punch breaks the second melt portion to form at least two second fractures connected in series.

4. The array-type multi-break excitation fuse according to claim 1, characterized in that The lattice structure on the conductive plate is arranged in at least a 2*2 array.

5. The array-type multi-break excitation fuse according to claim 1, characterized in that The bottom of the conductive plate portion broken off by the first cutting punch and the second cutting punch of the breaking device is supported by a plurality of support columns provided on the housing.

6. The array-type multi-break excitation fuse according to claim 1, characterized in that The cutting punch of the breaking device and the corresponding cavity located below the conductive plate are in interference fit.

7. The array-type multi-break excitation fuse according to claim 1, characterized in that The shell comprises two independent parts located on both sides of the conductive plate, and the excitation device and the interruption device are sequentially arranged in the shell part located on one side of the conductive plate.

8. The array-type multi-break excitation fuse according to claim 7, characterized in that The excitation device is in sealed contact with the cavity in the housing portion in which it is located.

9. The array-type multi-break excitation fuse according to claim 1, characterized in that A groove is provided on an end surface of the breaking device adjacent to the excitation device, and the driving force released by the excitation device acts on the groove.

10. The array-type multi-break excitation fuse according to claim 1, characterized in that The lattice structure on the conductive plate is arranged in a triangular array, a circular array, a rectangular array or a polygonal array.

11. The array-type multi-break excitation fuse according to claim 10, characterized in that The lattice structure arranged in a circular array on the conductive plate is composed of two hollow arc structures relatively opened near the two side edges of the conductive plate, a hollow structure opened between the two hollow arc structures, and two arc-shaped conductive channels formed between the hollow structure and the two hollow arc structures respectively; a lattice is provided on the conductive plate near the side edge of the hollow arc structure, and disconnected weak points are opened at both ends of the lattice; and several disconnected weak points are spaced apart on the arc-shaped conductive channel.

12. The array-type multi-break excitation fuse according to claim 1, characterized in that The structural shape of the first cutting punch of the breaking device only needs to be able to form an elongated conductive current flow path or a conductive current flow path with increased resistance on the conductive plate, and retain at least two series pre-breaks on the current flow path.

13. The array-type multi-break excitation fuse according to claim 1, characterized in that The structural shape of the second cutting punch of the breaking device only needs to be sufficient to completely cut off the conductive plate and form at least two fractures on the conductive plate.

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