Excitation fuse with tubular structure

Abstract

The invention provides an excitation fuse with a tubular structure, which comprises a closed insulating shell, and a first connecting end and a second connecting end are arranged at two ends of the insulating shell; a closed cavity is formed in the insulating shell, a movable block and two limiting parts with conductive performance are arranged in the closed cavity, a limiting gap is formed between the two limiting parts, and the two limiting parts are electrically connected with the first connecting end and the second connecting end respectively; the movable block comprises a first end and a second end which are opposite, and the first end is provided with an excitation source; the two sides of the second end are in tight fit connection with the two sides of the limiting gap respectively, and the two limiting parts are in conductive connection through the second end; a receding space is formed between the second end and the inner wall of the closed cavity. According to the tubular structure excitation fuse with the structure, the filling amount of an excitation source can be effectively reduced, and the design difficulty of the insulating shell is reduced; in addition, the melt part is compact in overall structure and convenient to use in occasions with strict space requirements.

Description

Technical Field

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

[0002] In modern power and electronic equipment, excitation fuses are important protective components whose key function is to disconnect the circuit through the impact force generated by the excitation source. However, excitation fuses in the prior art are usually stacked with multiple layers of components, which results in the product occupying a significant space in the height direction, which has gradually failed to meet the miniaturization requirements of products in specific occasions.

[0003] In addition, the excitation source in the current excitation fuse is mostly a gas generating device, which releases high-pressure gas to interrupt the main conductor when triggered. The huge impact force generated in this process often exerts a large pressure on the shell of the excitation source, increasing the risk of shell cracking and detachment. Therefore, higher strength materials and more complex design methods need to be selected during the manufacturing process to ensure the structural integrity of the shell, which undoubtedly increases the manufacturing cost and process complexity. Summary of the invention

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

[0005] In order to achieve the above-mentioned object, the present invention provides a tubular structure excitation fuse, which includes a sealed insulating shell, and the two ends of the insulating shell are provided with a first connection end and a second connection end for connecting to an external circuit; a sealed cavity is formed inside the insulating shell, and a movable block and two limiting parts with conductive properties are provided in the sealed cavity, and a limiting gap is provided 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 comprises 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 inner space of the recess is sealed, the recess is filled with an excitation source, and the insulating shell 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 are electrically connected through the second end; 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.

[0006] Preferably, the closed cavity is also filled with arc extinguishing medium.

[0007] 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.

[0008] Preferably, two support arms are arranged opposite to each other in the enclosed cavity, and the two limit parts are respectively attached to the inner sides of the ends of the two support arms close to each other, and the two limit parts are respectively electrically connected to the first connection end and the second connection 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.

[0009] 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.

[0010] Preferably, first melt pieces are respectively arranged on both sides of the second end of the movable block close to the limiting portion, and the two first melt pieces are electrically connected through a second melt piece arranged on the other side of the second end; the first melt piece and the second melt piece can be melted under abnormal current.

[0011] Preferably, the first melt piece and the second melt piece are sheet structures, a plurality of first partition parts are arranged at intervals on the first melt piece, a plurality of second partition parts are arranged at intervals on the second melt piece, and a diameter of the first partition part is larger than a diameter of the second partition part, so that the first melt piece is melted before the second melt piece.

[0012] 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 resisting force that is in close contact with the limiting portion.

[0013] Preferably, the two limit parts are electrically connected to the first connection end and the second connection end respectively through a connecting arm with conductive properties, and the two connecting arms are also electrically connected through a third fuse piece, and the resistance value of the third fuse piece is much greater than the resistance value of the first fuse piece, the third fuse piece crosses the make way space, and the movable block can break the third fuse piece after entering the make way space; the closed cavity is also filled with an arc extinguishing medium; at least a portion of the third fuse piece is enclosed in the arc extinguishing medium.

[0014] Preferably, the second end of the movable block can generate arc-extinguishing gas under arc erosion.

[0015] 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 to the limiting gap, and a clearance space is provided for the movable block. In this way, only a small impact force is needed to drive the movable block to move out of the limiting space and enter 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

[0016] Figure 1 It is a planar structural diagram of an excitation fuse in a conducting state in one embodiment of the present invention.

[0017] Figure 2 for Figure 1 Planar structural diagram of the fuse in protection state.

[0018] Figure 3 It is a planar structural diagram of an excitation fuse in a conducting state in another embodiment of the present invention.

[0019] Figure 4 It is a planar structural diagram of an excitation fuse in a conducting state in another embodiment of the present invention.

[0020] Figure 5 It is a three-dimensional structural diagram of the movable block in one viewing angle in an embodiment of the present invention.

[0021] Figure 6 It is a three-dimensional structural diagram of the movable block in another viewing angle in an embodiment of the present invention.

[0022] Figure 7 It is a three-dimensional structural diagram of the support platform in an embodiment of the present invention. DETAILED DESCRIPTION

[0023] 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 implementation methods and the accompanying drawings.

[0024] 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.

[0025] like Figures 1 to 5The fuse includes a sealed insulating housing 1, and the two ends of the insulating housing 1 are provided with a first connection terminal 10 and a second connection terminal 11 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 respectively the positive terminal and the negative terminal.

[0026] A closed cavity 12 is formed inside the insulating shell 1. A movable block 2 and two limiting parts 30 with conductive properties are arranged 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.

[0027] The movable block 2 includes a first end 20 and a second end 21 opposite to each other. The first end 20 is provided with a recess 200. The top opening of the recess 200 abuts against the inner wall of the closed cavity 12 so that the inner space of the recess 200 is sealed. The recess 200 is filled with an excitation source Y, and an excitation terminal 13 electrically connected to the excitation source Y is provided on the insulating housing 1.

[0028] The two sides of the second end 21 are respectively tightly connected with the two sides of the limiting gap X, and the two limiting parts 30 are electrically connected through the second end 21. It can be seen that when the second end 21 of the movable block 2 is located in the limiting gap X, the two limiting parts 30 are connected, thereby making the first connection end 10 and the second connection end 11 connected. When the second end 21 of the movable block 2 exits the limiting gap X, the two limiting parts 30 are disconnected, thereby making the first connection end 10 and the second connection end 11 disconnected.

[0029] There is a clearance space K between the second end 21 and the inner wall of the closed cavity 12, and the excitation source Y is used to generate an impact force under the excitation signal provided by the excitation end 13, and the impact force can drive the second end 21 to move out of the limit gap X and enter the clearance space K. In this embodiment, the excitation source Y is gunpowder, and the excitation end 13 is connected to the control device of the protection circuit. When an abnormality occurs in the protection circuit, the control device sends an excitation signal to the excitation end 13, and the gunpowder as the excitation source Y is ignited to generate an impact force.

[0030] 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.

[0031] On the other hand, when the second end 21 of the movable block 2 is located in 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 directly act on the center of the second end 21, so that the forces on both sides of the second end 21 are relatively balanced, preventing the movable block 2 from tilting to one side and getting stuck.

[0032] On the other hand, two support arms 4 are arranged opposite to each other in the closed cavity 12, and two limit portions 30 are respectively attached to the inner sides of the ends of the two support arms 4 close to each other, and the two limit portions 30 are respectively electrically connected to the first connection end 10 and the second connection end 11 through a connecting arm 31 with electrical and thermal conductivity, and the two connecting arms 31 are respectively located on the support arms 4 at corresponding positions. In this embodiment, the stability of the movable block 2 is effectively ensured under normal circumstances by the arrangement of two opposing support arms 4. In addition, the connecting arms 31 can quickly cool the arc while playing a conductive role.

[0033] Further, if Figure 1 and Figure 7 A support platform 5 with a groove is also provided in the closed cavity 12, and the ends of the two support arms 4 close to each other are respectively connected to the two ends of the support platform 5, and the grooves in the support platform 5 form a clearance space K. In this embodiment, by setting the support platform 5 located in the insulating shell 1, when the movable block 2 is subjected to the impact force of the excitation source Y, it quickly moves to the clearance space K located inside the support, disconnecting the conductive connection while avoiding direct damage to the insulating shell 1 by the impact force, thereby reducing the material strength requirements of the insulating shell 1 and further reducing the manufacturing cost.

[0034] On the other hand, Figures 1 to 5 The first melt pieces 60 are respectively arranged on both sides of the second end 21 of the movable block 2 near the limit portion 30, and the two first melt pieces 60 are electrically connected through the second melt piece 61 arranged on the other side of the second end 21. The first melt piece 60 and the second melt piece 61 can be melted under abnormal current.

[0035] 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 fuse 60 and the second fuse 61 will melt under the large current, thereby disconnecting the conductive connection between the first connection terminal 10 and the second connection terminal 11.

[0036] Furthermore, the first melt piece 60 and the second melt piece 61 are sheet structures, 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, and 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.

[0037] In this embodiment, the first partition 600 and the second partition 610 are provided so that the first fusion component 60 and the second fusion component 61 can be quickly fused under abnormal large current. In addition, when the current is abnormal, the first fusion component 60 is fused first, and the generated arc can be extinguished by the surrounding arc extinguishing medium P. After the first fusion component 60 is fused, the arc extinguishing medium P enters the clearance space K, and at this time, the second fusion component 61 is fused. If the second fusion component 61 is fused at the same time as the first fusion component 60, the arc on the second fusion component 61 is not easy to extinguish. Therefore, in this embodiment, the first fusion component 60 is set to be fused before the second fusion component 61, which can effectively solve the problem that the arc on the second fusion component 61 is not easy to extinguish.

[0038] On the other hand, Figure 3 An elastic sheet 7 is disposed between the first melt component 60 and the side wall of the second end 21 of the movable block 2, and the elastic sheet 7 is bent toward one side of the first melt component 60 to provide the first melt component 60 with an elastic resisting force that is in close contact with the limiting portion 30. In this embodiment, by disposing the elastic sheet 7, the first melt component 60 is in close contact with the limiting portion 30 on the outside, thereby effectively reducing the resistance value between the two and effectively saving waste.

[0039] On the other hand, Figure 4 , the two connecting arms 31 are also electrically connected through the third melt piece 62, and the resistance value of the third melt piece 62 is much greater than the resistance value of the first melt piece 60, the third melt piece 62 crosses the clearance space K, and the movable block 2 can break the third melt piece 62 after entering the clearance space K. At least part of the third melt piece 62 is coated in the arc extinguishing medium P. In this embodiment, through the setting of the third melt piece 62, when the circuit is normal, since the resistance value of the third melt piece 62 is much greater than the first melt piece 60, the current mainly flows through the first melt piece 60. When the circuit current is abnormal, a large current flows through the first melt piece 60 and the second melt piece 61 respectively, which can effectively reduce the amount of arc generated by the first melt piece 60 due to melting, thereby quickly extinguishing the arc.

[0040] On the other hand, the second end 21 of the movable block 2 can generate arc extinguishing gas under arc erosion. Specifically, the material of the second end 21 is PA66 (thermoplastic resin). When the first melt component 60 and the second melt component 61 are melted, the generated arc erodes the second end of the movable block 2, and the generated arc extinguishing gas can quickly extinguish the arc.

[0041] like Figures 1 to 7 , the working principle of the tubular structure excitation fuse disclosed in the above embodiment is: When the excitation end 13 receives an external signal and moves, the movable block 2 starts to drive the first melt piece 60 and the second melt piece 61 to move downward under the impact force released by the excitation source Y, and disconnects the conductive path between the two limit parts 30. Then, the arc extinguishing medium P filled in the insulating housing 1 will also enter the clearance space K under the vibration caused by the impact force and its own gravity, extinguishing the arc generated by the first melt piece 60 separating from the limit part 30, until the movable block 2 moves to the bottom of the clearance space K and the arc is extinguished. In addition, when the first melt piece 60 is separated from the limit part 30, the circuit current is transferred to the third melt piece 62, and the third melt piece 62 is caused to fuse and draw an arc. Then, the second end 21 of the movable block 2 moves to the top of the third melt piece 62 and pulls the third melt piece 62 downward, and the arc generated on the third melt piece 62 is quickly extinguished under the rapid extension of the arc and the cooling effect of the arc extinguishing medium P.

[0042] When the excitation source Y fails, the abnormally large external current will first cause the first melt component 60 to melt, and the generated arc will be confined in the narrow gap between the limit part 30 and the first melt component 60. At this time, the arc is cooled by the connecting arm 31 through rapid heat conduction, and the arc extinguishing gas is generated by the arc erosion of the second end 21 of the movable block 2, thereby reducing the arc energy. When the first melt component 60 melts, the second melt component 61 and the third melt component 62 melt. The residues of the first melt component 60 and the second melt component 61 after melting will fall to the bottom of the clearance space K under the action of their own gravity, thereby quickly lengthening the arc, improving the insulation capacity, and achieving the purpose of safe passive protection.

[0043] It can be seen 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 with 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 to move out of the limiting space and enter 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.

[0044] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of rights 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 covered by the present invention.

Claims

1. A tubular structure excitation fuse, characterized in that: The invention comprises a sealed insulating shell, wherein two ends of the insulating shell are provided with a first connection end and a second connection end for connecting to an external circuit; a sealed cavity is formed inside the insulating shell, wherein a movable block and two limiting parts with conductive properties are provided in the sealed cavity, a limiting gap is provided 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 comprises 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 inner space of the recess is sealed, the recess is filled with an excitation source, and the insulating shell 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 are electrically connected through the second end; 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.

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

3. The tubular structure excitation fuse according to claim 1, characterized in that: 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.

4. The tubular structure excitation fuse according to claim 1, characterized in that: Two support arms are arranged opposite to each other in the closed cavity, and the two limiting parts are respectively attached to the inner sides of the ends of the two support arms 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.

5. The tubular structure excitation fuse according to claim 4, characterized in that: A support platform with a groove is also 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.

6. The tubular structure excitation fuse according to claim 1, characterized in that: First melt pieces are respectively arranged on both sides of the second end of the movable block close to the limiting portion, and the two first melt pieces are electrically connected through a second melt piece arranged on the other side of the second end; the first melt piece and the second melt piece can be melted under abnormal current.

7. The tubular structure excitation fuse according to claim 6, characterized in that: The first melt piece and the second melt piece are sheet structures, a plurality of first partition parts are arranged at intervals on the first melt piece, and a plurality of second partition parts are arranged at intervals on the second melt piece, and a diameter of the first partition part is larger than a diameter of the second partition part, so that the first melt piece is melted before the second melt piece.

8. The tubular structure excitation fuse according to claim 6, characterized in that: An elastic sheet is disposed 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 resisting force that is in close contact with the limiting portion.

9. The tubular structure excitation fuse according to claim 6, characterized in that: The two limit parts are electrically connected to the first connection end and the second connection end respectively through a connecting arm with conductive performance, and the two connecting arms are also electrically connected through a third fuse piece, and the resistance value of the third fuse piece is much greater than the resistance value of the first fuse piece, the third fuse piece crosses the make way space, and the movable block can break the third fuse piece after entering the make way space; the closed cavity is also filled with an arc extinguishing medium; at least a portion of the third fuse piece is enclosed in the arc extinguishing medium.

10. 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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