Tubular structure excitation fuse

Abstract

The present invention provides a tubular structure excitation fuse, which includes a sealed insulating shell, with a first connection end and a second connection end provided at both ends of the insulating shell; a closed cavity is formed inside the insulating shell, and a movable block and two conductive limiting parts are provided in the closed cavity, with a limiting gap between the two limiting parts, and the two limiting parts are electrically connected to the first connection end and the second connection end respectively; the movable block includes a first end and a second end opposite to each other, and the first end is provided with an excitation source; the two sides of the second end are tightly connected to the two sides of the limiting gap respectively, and the two limiting parts establish a conductive connection through the second end; there is a clearance space between the second end and the inner wall of the closed cavity. The tubular structure excitation fuse with the above structure can effectively reduce the filling amount of the excitation source and reduce the design difficulty of the insulating shell; in addition, the overall structure of the fuse is compact, which is convenient for use in occasions with strict space requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of fuses, and in particular to a tubular structure excitation fuse. Background Art

[0002] In modern electrical and electronic equipment, excitation fuses are crucial protective components. Their key function is to disconnect the circuit by utilizing the impact force generated by an excitation source. However, existing excitation fuses typically utilize multiple layers of stacked components, resulting in a significant height penalty. This has become increasingly inadequate for miniaturization in certain applications.

[0003] Furthermore, the excitation source in current energized fuses is often a gas generator, which, when triggered, releases high-pressure gas to interrupt the main conductor. The enormous impact force generated during this process often exerts significant pressure on the excitation source housing, increasing the risk of cracking and detachment. Consequently, the manufacturing process requires the use of higher-strength materials and more complex designs to ensure the structural integrity of the housing, which undoubtedly increases manufacturing costs and process complexity. Summary of the Invention

[0004] The object of the present invention is to provide a tubular structure excitation fuse which has a compact structure and can effectively reduce the impact force of an excitation source.

[0005] To achieve the above objectives, the present invention provides a tubular structure excitation fuse, comprising a sealed insulating housing, with a first connection end and a second connection end provided at both ends of the insulating housing for connection to an external circuit; a sealed cavity formed within the insulating housing, a movable block and two conductive limit portions provided within the sealed cavity, a limit gap being defined between the two limit portions, and the two limit portions being electrically connected to the first connection end and the second connection end, respectively;

[0006] The movable block includes a first end and a second end opposite to each other, the first end is provided with a recess, the top opening of the recess abuts against the inner wall of the closed cavity so that the internal space of the recess is sealed, the recess is filled with an excitation source, and the insulating housing is provided with an excitation end electrically connected to the excitation source;

[0007] The two sides of the second end are respectively tightly connected with the two sides of the limiting gap, and the two limiting parts establish a conductive connection through the second end;

[0008] There is a clearance space between the second end and the inner wall of the closed cavity. The excitation source is used to generate an impact force under the excitation signal provided by the excitation end, and the impact force can drive the second end to move out of the limiting gap and enter the clearance space.

[0009] Preferably, the closed cavity is also filled with arc extinguishing medium.

[0010] Preferably, when the second end of the movable block is located in the limiting gap, the central axis of the recess coincides with the central axis of the second end of the movable block.

[0011] Preferably, two support arms are arranged opposite to each other in the enclosed cavity, and the two limiting parts are respectively attached to the inner sides of the ends of the two support arms that are close to each other. The two limiting parts are respectively electrically connected to the first connecting end and the second connecting end through a connecting arm with conductive and thermal conductive properties, and the two connecting arms are respectively located on the support arms at corresponding positions.

[0012] Preferably, a support platform with a groove is further provided in the closed cavity, and the ends of the two support arms close to each other are respectively connected to the two ends of the support platform, and the groove in the support platform forms the clearance space.

[0013] Preferably, first melt parts are respectively provided on both sides of the second end of the movable block close to the limiting portion, and the two first melt parts are electrically connected through a second melt part provided on the other side surface of the second end; the first melt part and the second melt part can be melted under abnormal current.

[0014] Preferably, the first melt piece and the second melt piece are sheet-like structures, a plurality of first partitions are arranged at intervals on the first melt piece, and a plurality of second partitions are arranged at intervals on the second melt piece, and the diameter of the first partition is larger than the diameter of the second partition, so that the first melt piece is melted before the second melt piece.

[0015] Preferably, an elastic sheet is provided between the first melt component and the side wall of the second end of the movable block, and the elastic sheet is bent toward one side of the first melt component to provide the first melt component with an elastic supporting force that is in close contact with the limiting portion.

[0016] Preferably, the two limiting parts are electrically connected to the first connecting end and the second connecting end respectively through a connecting arm with conductive properties, and the two connecting arms are also electrically connected through a third melt piece, and the resistance value of the third melt piece is much greater than the resistance value of the first melt piece, the third melt piece crosses the makeshift space, and the movable block can pull the third melt piece apart after entering the makeshift space; the closed cavity is also filled with an arc extinguishing medium; at least a portion of the third melt piece is enclosed in the arc extinguishing medium.

[0017] Preferably, the second end of the movable block can generate arc extinguishing gas under arc erosion.

[0018] Compared with the prior art, the tubular structure excitation fuse provided by the above technical solution of the present invention has a limiting gap for clamping the movable block constructed by two limiting parts in the closed cavity formed by the insulating shell. One end of the movable block is tightly connected with the limiting gap, and a clearance space is also provided for the movable block. In this way, only a small impact force is needed to drive the movable block out of the limiting space and into the clearance space, thereby breaking the conductive connection of the circuit where the fuse is located. Therefore, the filling amount of the excitation source can be effectively reduced, and the design difficulty of the insulating shell is reduced; in addition, the overall structure of the fuse piece is compact, which is convenient for use in occasions with strict space requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a planar structural diagram of an excitation fuse in a conducting state in one embodiment of the present invention.

[0020] Figure 2 for Figure 1 Planar structure diagram of the fuse in protection state.

[0021] Figure 3 This is a planar structural diagram of an excitation fuse in a conducting state in another embodiment of the present invention.

[0022] Figure 4 This is a planar structural diagram of an excitation fuse in a conducting state in another embodiment of the present invention.

[0023] Figure 5 1 is a three-dimensional structural diagram of the movable block in one viewing angle in an embodiment of the present invention.

[0024] Figure 6 This is a three-dimensional structural diagram of the movable block in another perspective in an embodiment of the present invention.

[0025] Figure 7 3D is a three-dimensional structural diagram of the support platform in an embodiment of the present invention. DETAILED DESCRIPTION

[0026] In order to explain the technical content, structural features, achieved objectives and effects of the present invention in detail, the following is a detailed description in conjunction with the embodiments and the accompanying drawings.

[0027] The invention discloses a tubular structure excitation fuse for use in protecting a circuit. When an abnormality occurs in the circuit, the fuse automatically disconnects the circuit to avoid potential safety hazards.

[0028] like Figures 1 to 5The fuse includes a sealed insulating housing 1, with a first connection terminal 10 and a second connection terminal 11 provided at both ends for connecting to an external circuit. Specifically, the fuse is connected to the protection circuit through the first connection terminal 10 and the second connection terminal 11. That is, the first connection terminal 10 and the second connection terminal 11 are the positive terminal and the negative terminal, respectively.

[0029] A closed cavity 12 is formed inside the insulating shell 1. A movable block 2 and two conductive limiting parts 30 are provided in the closed cavity 12. A limiting gap X is provided between the two limiting parts 30. The two limiting parts 30 are electrically connected to the first connection end 10 and the second connection end 11 respectively.

[0030] The movable block 2 includes a first end 20 and a second end 21. The first end 20 is provided with a recess 200. The top opening of the recess 200 abuts against the inner wall of the sealed cavity 12, thereby sealing the interior space of the recess 200. The recess 200 is filled with an excitation source Y, and the insulating housing 1 is provided with an excitation terminal 13 electrically connected to the excitation source Y.

[0031] The two sides of the second end 21 are tightly connected to the two sides of the limiting gap X, and the two limiting portions 30 are electrically connected through the second end 21. Therefore, when the second end 21 of the movable block 2 is within the limiting gap X, the two limiting portions 30 are electrically connected, thereby connecting the first connection end 10 and the second connection end 11. When the second end 21 of the movable block 2 exits the limiting gap X, the two limiting portions 30 are disconnected, thereby disconnecting the first connection end 10 and the second connection end 11.

[0032] A clearance space K is defined between the second end 21 and the inner wall of the sealed cavity 12. The excitation source Y is configured to generate an impact force in response to an excitation signal provided by the excitation terminal 13. This impact force can drive the second end 21 out of the restricted gap X and into the clearance space K. In this embodiment, the excitation source Y is gunpowder. The excitation terminal 13 is connected to a control device of the protection circuit. When an abnormality occurs in the protection circuit, the control device sends an excitation signal to the excitation terminal 13, igniting the gunpowder serving as the excitation source Y and generating the impact force.

[0033] In addition, the sealed cavity 12 is also filled with an arc extinguishing medium P to ensure that an arc generated in the sealed cavity 12 is quickly extinguished.

[0034] On the other hand, when the second end 21 of the movable block 2 is located within the limiting gap X, the central axis of the recess 200 coincides with the central axis of the second end 21 of the movable block 2. This allows the impact force generated by the excitation source Y to act directly on the center of the second end 21. In this way, the forces acting on both sides of the second end 21 are relatively balanced, preventing the movable block 2 from tilting to one side and getting stuck.

[0035] On the other hand, two support arms 4 are positioned opposite each other within the sealed cavity 12. Two stoppers 30 are attached to the inner sides of the adjacent ends of the two support arms 4. The two stoppers 30 are electrically connected to the first connection end 10 and the second connection end 11 via a connecting arm 31 with both electrical and thermal conductivity. The two connecting arms 31 are located on the support arms 4 at corresponding positions. In this embodiment, the arrangement of the two opposing support arms 4 effectively ensures the stability of the movable block 2 under normal conditions. Furthermore, the connecting arms 31 not only provide electrical conductivity but also rapidly cool the arc.

[0036] Further, if Figure 1 and Figure 7 A support platform 5 with a groove is also provided within the enclosed cavity 12. The adjacent ends of the two support arms 4 are connected to the ends of the support platform 5, respectively. The grooves within the support platform 5 form a clearance space K. In this embodiment, by providing the support platform 5 within the insulating housing 1, when the movable block 2 is impacted by the excitation source Y, it quickly moves into the clearance space K within the support platform, disconnecting the conductive connection while preventing direct damage to the insulating housing 1 from the impact force. This reduces the material strength requirements for the insulating housing 1 and further reduces manufacturing costs.

[0037] On the other hand, Figures 1 to 5 A first melt element 60 is provided on both sides of the second end 21 of the movable block 2 near the stopper 30. The two first melt elements 60 are electrically connected by a second melt element 61 provided on the other side of the second end 21. The first melt element 60 and the second melt element 61 can be melted under abnormal current.

[0038] In this embodiment, when the current flowing through the first connection terminal 10 and the second connection terminal 11 increases sharply, even if the excitation source Y does not receive an excitation signal, the first melt component 60 and the second melt component 61 will melt under the large current, thereby disconnecting the conductive connection between the first connection terminal 10 and the second connection terminal 11.

[0039] Furthermore, the first melt piece 60 and the second melt piece 61 are sheet structures, and a plurality of first partition parts 600 are arranged at intervals on the first melt piece 60, and a plurality of second partition parts 610 are arranged at intervals on the second melt piece 61. The diameter of the first partition part 600 is larger than the diameter of the second partition part 610, so that the first melt piece 60 is melted before the second melt piece 61.

[0040] In this embodiment, the provision of the first and second partitions 600 and 610 allows the first and second fuse elements 60 and 61 to quickly fuse under abnormally high currents. Furthermore, when the current is abnormal, the first fuse element 60 fuses first, and the resulting arc is extinguished by the surrounding arc-extinguishing medium P. After the first fuse element 60 fuses, the arc-extinguishing medium P enters the clearance space K, at which point the second fuse element 61 fuses. If the second fuse element 61 fuses simultaneously with the first fuse element 60, the arc on the second fuse element 61 is not easily extinguished. Therefore, in this embodiment, the first fuse element 60 is configured to fuse before the second fuse element 61, effectively resolving the problem of the arc on the second fuse element 61 being difficult to extinguish.

[0041] On the other hand, Figure 3 An elastic sheet 7 is disposed between the first melt member 60 and the sidewall of the second end 21 of the movable block 2. The elastic sheet 7 is bent toward one side of the first melt member 60 to provide an elastic supporting force for the first melt member 60 to closely contact the stopper 30. In this embodiment, the provision of the elastic sheet 7 ensures that the first melt member 60 closely contacts the outer stopper 30, thereby effectively reducing the resistance between the two and effectively saving waste.

[0042] On the other hand, Figure 4 The two connecting arms 31 are also electrically connected via a third melt element 62, whose resistance is much greater than that of the first melt element 60. The third melt element 62 traverses the clearance space K, and the movable block 2 can break the third melt element 62 after entering the clearance space K. At least a portion of the third melt element 62 is encased in an arc-extinguishing medium P. In this embodiment, due to the provision of the third melt element 62, when the circuit is normal, the current primarily flows through the first melt element 60, as the resistance of the third melt element 62 is much greater than that of the first melt element 60. However, when the circuit current is abnormal, large currents flow through the first melt element 60 and the second melt element 61, respectively, effectively reducing the amount of arcing generated by the first melt element 60 fusing, thereby rapidly extinguishing the arc.

[0043] Meanwhile, the second end 21 of the movable block 2 can generate arc-extinguishing gas when eroded by the arc. Specifically, the material of the second end 21 is PA66 (thermoplastic resin). When the first and second melt components 60 and 61 melt, the generated arc erodes the second end of the movable block 2, generating arc-extinguishing gas that quickly extinguishes the arc.

[0044] like Figures 1 to 7 The working principle of the tubular structure excitation fuse disclosed in the above embodiment is as follows:

[0045] When the excitation end 13 receives an external signal and activates, the movable block 2, under the impact force released by the excitation source Y, begins to move the first and second melt components 60 and 61 downward, breaking the conductive path between the two stoppers 30. Subsequently, the arc-extinguishing medium P filled within the insulating housing 1, under the vibration caused by the impact and its own gravity, enters the clearance space K, extinguishing the arc generated by the first melt component 60 separating from the stopper 30. This arc extinguishes until the movable block 2 moves to the bottom of the clearance space K. Furthermore, after the first melt component 60 separates from the stopper 30, the circuit current transfers to the third melt component 62, causing it to fuse and arc. Next, the second end 21 of the movable block 2 moves above the third melt component 62 and pulls it downward, breaking it. The arc generated in the third melt component 62 is quickly extinguished by the rapid arc extension and the cooling effect of the arc-extinguishing medium P.

[0046] When excitation source Y fails, the abnormally high external current will first cause first melt element 60 to melt. The resulting arc is confined to the narrow gap between the stopper 30 and first melt element 60. At this point, while the arc is rapidly cooled by heat conduction through the connecting arm 31, the arc erodes the second end 21 of the movable block 2, generating arc-extinguishing gas and reducing the arc energy. After first melt element 60 melts, the second and third melt elements 61 and 62 also melt. The remaining residues of the first and second melt elements 60 and 61 fall to the bottom of the clearance space K under their own gravity, rapidly lengthening the arc and improving insulation capacity, achieving the purpose of passive safety protection.

[0047] It can be seen from this that the present invention discloses a tubular structure excitation fuse. In the closed cavity 12 formed by the insulating shell 1, a limiting gap X for clamping the movable block 2 is constructed by two limiting parts 30. One end of the movable block 2 is tightly connected to the limiting gap X, and a clearance space K is provided for the movable block 2. In this way, only a small impact force is needed to drive the movable block 2 out of the limiting space and into the clearance space K, thereby breaking the conductive connection of the circuit where the fuse is located. Therefore, the fuse with the above structure can effectively reduce the filling amount of the excitation source Y and reduce the design difficulty of the insulating shell 1. In addition, the overall structure of the fuse piece is compact, which is convenient for use in occasions with strict space requirements.

[0048] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention are still within the scope of the present invention.

Claims

1. A tubular structure excitation fuse, characterized in that: The device comprises a sealed insulating housing, wherein a first connection end and a second connection end are provided at both ends of the insulating housing for connecting to an external circuit; a sealed cavity is formed inside the insulating housing, wherein a movable block and two conductive limiting portions are provided in the sealed cavity, a limiting gap is defined between the two limiting portions, and the two limiting portions are electrically connected to the first connection end and the second connection end, respectively; The movable block includes a first end and a second end opposite to each other, the first end is provided with a recess, the top opening of the recess abuts against the inner wall of the closed cavity so that the internal space of the recess is sealed, the recess is filled with an excitation source, and the insulating housing is provided with an excitation end electrically connected to the excitation source; The two sides of the second end are respectively tightly connected with the two sides of the limiting gap, and the two limiting parts establish a conductive connection through the second end; There is a clearance space between the second end and the inner wall of the closed cavity, and the excitation source is used to generate an impact force under the excitation signal provided by the excitation end, and the impact force can drive the second end to move out of the limiting gap and enter the clearance space; when the second end of the movable block is located in the limiting gap, the central axis of the recess coincides with the central axis of the second end of the movable block; two supporting arms are arranged opposite to each other in the closed cavity, and the two limiting parts are respectively attached to the inner side of one end of the two supporting arms close to each other, and the two limiting parts are respectively electrically connected to the first connecting end and the second connecting end through a connecting arm with conductive and thermal conductivity, and the two connecting arms are respectively located on the support arms at corresponding positions; A support platform with a groove is further provided in the closed cavity, and the ends of the two support arms close to each other are respectively connected to the two ends of the support platform, and the grooves in the support platform form the clearance space; A first melt component is provided on both sides of the second end of the movable block close to the limiting portion, and the two first melt components are electrically connected through a second melt component provided on the other side surface of the second end; the first melt component and the second melt component can be melted under abnormal current.

2. The tubular structure excitation fuse according to claim 1, characterized in that: The sealed cavity is also filled with arc extinguishing medium.

3. The tubular structure excitation fuse according to claim 1, characterized in that: The first melt piece and the second melt piece are sheet-like structures. A plurality of first partitions are arranged at intervals on the first melt piece, and a plurality of second partitions are arranged at intervals on the second melt piece. The diameter of the first partition is larger than the diameter of the second partition, so that the first melt piece is melted before the second melt piece.

4. The tubular structure excitation fuse according to claim 1, characterized in that: An elastic piece is provided between the first melt component and the side wall of the second end of the movable block. The elastic piece is bent toward one side of the first melt component to provide the first melt component with an elastic supporting force that tightly contacts the limiting portion.

5. The tubular structure excitation fuse according to claim 1, characterized in that: The two limiting parts are electrically connected to the first connection end and the second connection end respectively through a connecting arm with conductive properties. The two connecting arms are also electrically connected through a third melt piece, and the resistance value of the third melt piece is much greater than the resistance value of the first melt piece. The third melt piece crosses the makeshift space, and the movable block can pull the third melt piece apart after entering the makeshift space; the closed cavity is also filled with an arc extinguishing medium; at least a portion of the third melt piece is enclosed in the arc extinguishing medium.

6. The tubular structure excitation fuse according to claim 1, characterized in that: The second end of the movable block can generate arc extinguishing gas under arc erosion.

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