Excitation fuse with high breaking capacity and small size

Abstract

A high-breaking small-size excitation fuse comprises a first shell, a second shell and a third shell which are spliced. The conducting bar and the third shell are integrally formed in an injection molding mode through an n-shaped structure, the two ends of the conducting bar extend to the two sides of one end of the excitation fuse shell respectively and are flush with the end, the portion, needing to be disconnected, of the conducting bar is located at the end, adjacent to the third shell, of the second shell, and the portion, needing to be disconnected, of the conducting bar is located in the cavity. An arc extinguishing chamber filled with an arc extinguishing medium is formed in one side, facing the excitation source, of the conducting bar and in the second shell on the peripheral side of the cavity, and a melt connected in parallel with the conducting bar is arranged in the arc extinguishing chamber in a penetrating manner; when the excitation source releases high-pressure gas to drive the piston to move along the cavity, the piston firstly disconnects the conducting bar from the portion, needing to be disconnected, of the conducting bar and then disconnects the melt. The conducting bar and the shell are integrally formed in the shape of the Chinese character'ji ', the number of parts and assembling faces are reduced, the structure is more compact, and the product size is smaller.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of circuit protection, in particular to the circuit protection of new energy vehicles, and specifically to an excitation fuse for circuit protection. BACKGROUND

[0002] The conductive row of the common excitation fuse on the market is mostly in an assembled structure with the upper and lower shell assemblies. The disadvantage of this assembled structure is that the conductive row and the upper and lower shells and other parts achieve the overall structural strength and sealing through assembly, which requires high machining precision of each part. For example, the excitation fuse successively includes a gland, a first shell, a second shell, a third shell, and a bottom cover. The conductive plate is arranged between the first shell and the second shell, the parallel fuses are arranged in the third shell, the excitation source and the piston are located in the first shell, and there are many assembly gaps during the assembly process of each part. In the product breaking process, the gap will be enlarged due to the bearing of a large internal pressure, so that the high-temperature gas leaks through the gap to cause arc chutes. The force generated between the parts during the assembly process will also be partially transmitted to the breaking port of the conductive row, which will affect the overall shock resistance of the conductive row.

[0003] The use of an integral injection molding process structure for the conductive row will improve the shock resistance of the breaking port of the conductive row, but the sealing between the upper and lower shells still needs to be realized by a separate sealing structure. For example, the short-circuit device disclosed in Chinese Patent CN219286291U is injection molded with the shell, and then is respectively butted against the first shell and the third shell. The butt joint surface needs to be sealed by a sealing member. In this short-circuit device, the conductive sheet is located at the middle part of the height of the short-circuit device and has a straight plate structure. In the application end, the product structure layout space of the client end will be affected. When the client end space layout is not satisfied, the circuit breaking device is installed into the installation scene by a long bolt. When the time is long, the bolt is easily loosened to cause poor conduction. Moreover, the injection member of the conductive sheet cannot be provided with parallel arc-extinguishing fuses. SUMMARY

[0004] The purpose of the present application is to provide an excitation fuse with high breaking and small volume. The conductive plate with a U-shaped structure is injection molded with the shell, the space of the shell outside the piston displacement path between the conductive row and the excitation source is used to arrange the fuses, the number of parts and the assembly surface are reduced, the product structure is more compact, and the product volume is reduced.

[0005] To achieve the above object, the technical scheme provided by the application is a high-breaking small-size excitation fuse, comprising spliced first, second and third housings, and through cavities are arranged in the first, second and third housings; an excitation source and a piston are sequentially arranged in the cavity in the first housing; the conductive row is integrally injection molded with the third housing in a U-shaped structure, two ends of the conductive row are respectively extended to both sides of an end of the third housing away from the second housing and flush with the end of the third housing, and the part of the conductive row to be broken is located at one end of the second housing adjacent to the third housing and in the cavity; an arc-extinguishing chamber filled with arc-extinguishing medium is formed in the second housing on the side of the conductive row facing the excitation source and located on the outer circumferential side of the cavity, and a fuse in parallel with the conductive row is arranged in the arc-extinguishing chamber; when the excitation source releases high-pressure gas to drive the piston to displace along the cavity, the piston first breaks the conductive row at the part to be broken and then breaks the fuse.

[0006] Preferably, the piston comprises a conductive row impact end and a fuse impact end, the conductive row impact end is arranged through the second housing corresponding to the part of the conductive row to be broken, and the fuse impact end is located in the cavity of the first housing; when the piston displaces, the conductive row impact end of the piston breaks the conductive row, and the fuse impact end breaks the fuse.

[0007] Preferably, a through cavity is arranged in the second housing and passes through both ends of the second housing, at least one displacement channel for breaking the fuse is arranged in the second housing on the outer side of the cavity, a fuse breaking assembly is arranged in the displacement channel, the fuse passes through the arc-extinguishing chamber and the displacement channel and is located on the displacement path of the fuse breaking assembly; the conductive row impact end of the piston is arranged in the cavity in the second housing, and the fuse impact end is arranged corresponding to the fuse breaking assembly in the displacement channel; the conductive row impact end breaks the conductive row, and the fuse impact end drives the fuse breaking assembly to displace to break the fuse.

[0008] Preferably, four independent arc-extinguishing chambers are arranged in the second housing around the outer circumferential side of the displacement path of the piston, one end of each arc-extinguishing chamber is closed and the other end is open, the open end of each arc-extinguishing chamber is arranged in the direction of the first housing, and the end face of the first housing closes the arc-extinguishing chamber in the second housing.

[0009] Preferably, the fuse has a hollow structure, the hollow part of the fuse is sleeved on the outer circumferential side of the cavity of the second housing, the fuse is located in the arc-extinguishing chamber, and the conductive row impact end of the piston passes through the hollow part of the fuse and is located in the cavity in the second housing.

[0010] Preferably, mechanical seal structures are arranged between the contact surfaces of the first and second shells and between the contact surfaces of the second and third shells.

[0011] Preferably, the mechanical seal structures comprise seal grooves and seal ribs, which are arranged on the contact surfaces of the first and second shells and on the contact surfaces of the second and third shells, and the seal ribs are nested in the seal grooves.

[0012] Preferably, a groove structure is arranged on the end surface of the third shell away from the second shell, and a seat is arranged in the groove structure; the cavity in the third shell for the disconnected part of the conductive row is through the two ends of the third shell, and a receiving groove is arranged on the seat corresponding to the position of the cavity.

[0013] Preferably, the first shell and the excitation source are integrally injection molded.

[0014] Preferably, a sleeve is arranged in the cavity of the first shell, the piston is arranged in the sleeve, and the high-pressure gas release end of the excitation source is located in the sleeve.

[0015] The high-breaking small-volume excitation fuse of the application is integrally injection molded with the shell in a U-shaped conductive row, so that the connection end of the excitation fuse is located at one end of the excitation fuse shell, facilitating the installation of the excitation fuse.

[0016] The U-shaped conductive row can enhance the impact resistance of the shell side wall.

[0017] The integrally injection molding of the conductive row and the shell, the assembly between the first shell, the second shell, the third shell integrally injection molded with the conductive row and the seat reduce the number of parts and the assembly mating surface, facilitating assembly, and the sealing of the shell assembly surface by mechanical sealing at the mating surface avoids the use of sealing elements, and prevents arc overflow.

[0018] The second shell located on the side of the conductive row facing the excitation source serves as a space for accommodating the parallel melt of the conductive row, fully utilizing the shell space on the outer circumferential side of the piston displacement path between the conductive row and the excitation source to accommodate the melt, saving shell space, making the product structure more compact, and making the excitation fuse product smaller in size; moreover, the conductive row is generally made of copper material, which is expensive, so shortening the height difference of the U-shaped conductive row to shorten the length of the conductive row reduces the amount of conductive row material, reduces the weight of the fuse, and reduces the product cost.

[0019] An independent arc extinguishing cavity provided in the second housing enables the arc to be generated and extinguished in the independent sealed cavity, avoiding arc series and improving the breaking capacity. Brief Description of the Drawings

[0020] Figure 1 is a schematic diagram of the three-dimensional appearance structure.

[0021] Figure 2 is Figure 1 the schematic cross-sectional structure diagram of

[0022] Figure 3 is Figure 1 the schematic cross-sectional structure diagram of

[0023] Figure 4 the schematic structure diagram of the second housing.

[0024] Reference Signs:

[0025] The first housing 1, sleeve 101, second housing 2, cavity 201, arc extinguishing cavity 202, base 3, excitation source 4, piston 5, third housing 6, busbar 7, melt 8, connector 401, seal 501, busbar impact end 502, melt impact end 503, busbar to be disconnected part 701, melt disconnecting assembly 9, push rod 9o1, guide rod 902, mechanical seal structure 10. Detailed Embodiments

[0026] The high-breaking-capacity and small-volume excitation fuse of the present invention includes a spliced first housing, second housing, and third housing, and a through cavity is provided in the first housing, second housing, and third housing; the excitation source and the piston are sequentially arranged in the cavity of the first housing; the busbar is integrally injection-molded with the third housing in a U-shaped structure, and both ends of the busbar extend to both sides of the end of the third housing far from the second housing and are flush with the end of the third housing, the busbar to be disconnected is located at the adjacent end of the second housing and the third housing, and the busbar to be disconnected is located in the cavity; an arc extinguishing chamber filled with arc extinguishing medium is formed in the second housing on the side of the busbar facing the excitation source and outside the cavity, and a melt parallel to the busbar is arranged in the arc extinguishing chamber; when the excitation source releases high-pressure gas to drive the piston to displace along the cavity, the piston first disconnects the busbar from the busbar to be disconnected part, and then disconnects the melt.

[0027] The following gives preferred embodiments and specific descriptions in combination with the drawings. The orientation words involved are only based on the orientation shown in the drawings and do not constitute a limitation on the technical solution of the present invention.

[0028] The high-breaking-capacity and small-volume excitation fuse of the present invention, refer to Figures 1 to 4, comprising a first shell 1, a second shell 2, a base 3, an excitation source 4, a piston 5, a third shell 6, a conductive row 7, a fuse 8, a fuse breaking assembly, a mechanical sealing structure 10, a sleeve 101.

[0029] The first shell 1, the second shell 2, the third shell 6 and the base 3 are sequentially spliced to form an excitation fuse shell, and the first shell 1, the second shell 2, the third shell 6 and the base 3 are fixed by bolts. A through cavity is formed in the first shell 1, the second shell 2, the third shell 6 and the base 3, the through cavity passes through both ends of the first shell, the second shell and the third shell, and a groove is formed at the end face of the base adjacent to the third shell as part of the cavity.

[0030] The cavity of the first shell 1 is provided with a sleeve 101, and the sleeve 101 is arranged in the inner wall of the cavity of the first shell 1. The excitation source 4 and the piston 5 are sequentially arranged in the cavity of the first shell 1, the excitation source 4 is located at one end of the cavity of the first shell 1 away from the second shell, the excitation source 4 closes one end of the cavity of the first shell 1, and the piston 5 is located in the sleeve 101 in the cavity of the first shell 1. In other embodiments, the excitation source 4 and the first shell 1 can be integrally formed by insert molding. The high-pressure gas release end of the excitation source 4 is located in the sleeve 101 in the first shell 1, and the end of the excitation source 4 receiving the trigger signal is located outside the first shell, and a connector 401 is arranged at the signal receiving end of the excitation source 4. The excitation source 4 is a gas generating device, which can act according to the received trigger signal and release high-pressure gas as driving force. The piston 5 is arranged in the sleeve 101 in the cavity of the first shell 1, and a ring of sealing members 501 is arranged on the outer periphery of the piston 5 in contact with the inner wall of the sleeve 101, for sealing the contact surface between the piston 5 and the inner wall of the cavity of the first shell 1. One end of the piston 5 is arranged towards the high-pressure gas release end of the excitation source 4, and the other end is arranged as an impact end towards the direction of the conductive row 7 and the fuse 8, forming a sealed space between the piston 5 and the excitation source 4. In this embodiment, the impact end of the piston 5 is three, the cross section of the piston 5 is in a mountain shape, the central impact end with the longest length is a conductive row impact end 502, the impact ends with shorter lengths on the opposite sides of the conductive row impact end 502 are fuse impact ends 503, the conductive row impact end 502 corresponds to the part 701 to be broken of the conductive row, and the fuse impact ends 503 correspond to the fuse breaking assembly.

[0031] The third shell 6 and the conductive row 7 are integrally formed by embedding mold injection, the conductive row 7 is arranged in the shell wall of the third shell 6, and the strength of the shell wall of the third shell can be enhanced. The third shell 6 is formed with a cavity penetrating through both ends of the third shell, and the conductive row 7 is in the shape of a U and located in the third shell 6. The conductive row to be disconnected part 701 is located in the cavity of the end of the third shell 6 facing the second shell 2, both ends of the conductive row 7 are located on the outer sides of the end of the third shell facing the base as the connection end of the actuating fuse, and the both ends of the conductive row 7 are flush with the end face of the actuating fuse shell away from the excitation source. In this embodiment, the both ends of the conductive row 7 as the connection end are not provided with mounting holes, and when mounted, they can be mounted by welding. In other embodiments, mounting holes can be provided for mounting connection. The conductive row to be disconnected part 701 is provided with a weak part at the center position, and when the conductive row impact end of the piston 5 breaks the conductive row from the weak part, the conductive row to be disconnected part 701 is broken from the middle weak part by the conductive row impact end of the piston 5, and the conductive row impact end is located between the broken conductive rows to insulate the broken conductive rows. In this way, the thickness of the third shell integrally injection molded with the conductive row is relatively thin, and the volume of the actuating fuse is reduced.

[0032] The end of the third shell 6 facing the base 3 is provided with a groove structure, the base 3 is arranged in the groove structure, and the cavity of the third shell 6 is closed. The end face of the base 3 facing the third shell 6 is formed with a receiving groove corresponding to the cavity, which becomes part of the cavity in the actuating fuse.

[0033] The second shell 2 is located between the first shell 1 and the third shell 6. Four independent arc extinguishing cavities 202 are arranged between the outer peripheral side of the cavity 201 of the second shell 2 and the shell wall, and arc extinguishing medium is filled in the arc extinguishing cavities 202. Displacement channels are respectively arranged on the opposite sides of the cavity 201 of the second shell 2, and the displacement channels are not communicated with the third shell. The fuse 8 is in a hollow structure and has a hollow part that can be sleeved on the outer periphery of the cavity 201, so that the fuse 8 is sleeved on the outer periphery of the cavity 201, and the fuse 8 passes through the displacement channels on the opposite sides of the cavity 201 and the arc extinguishing medium of the four arc extinguishing cavities 202. The fuse breaking assembly 9 is arranged in the displacement channel, the fuse 8 is clamped on the fuse breaking assembly 9, and the fuse 8 is broken by the displacement of the fuse breaking assembly 9. The fuse 8 is provided with a narrow neck, and the narrow neck of the fuse 8 is located in the arc extinguishing medium of the arc extinguishing cavities 202. The fuse impact end 503 of the piston 5 is displaced in the cavity of the first shell 1 and corresponds to the fuse breaking assembly. The conductive row impact end 502 of the piston 5 penetrates through the cavity 201 of the second shell 2 and corresponds to the position of the conductive row to be disconnected part 701.

[0034] The melt breaking assembly 9 comprises a nested connection push rod 901 and a guide rod 902, and the connected end of the push rod and the guide rod is connected through a concave-convex nested structure. Limiting blocks are arranged on the opposite sides of the guide rod, and the limiting blocks are arranged on the grooves of the displacement channel of the second shell to limit the guide rod and the push rod. The connection between the limiting block and the guide rod is a breaking weak part, and when the piston pushes the melt breaking assembly, the guide rod is broken from the breaking weak part of the limiting block and is separated from the limiting.

[0035] A mechanical seal structure 10 is arranged on the end face where the first shell 1 and the second shell 2 are in contact, and the end face where the second shell 2 and the third shell 6 are in contact. The mechanical seal structure 10 comprises at least one circle of sealing grooves and a circle of sealing ribs corresponding thereto, and the sealing ribs are nested in the sealing grooves to form the mechanical seal structure 10. The sealing grooves and the sealing ribs are arranged in the two shells in contact, for example, the sealing grooves are arranged on the end face of the first shell, and the sealing ribs are arranged on the end face of the second shell. After the first shell and the second shell are spliced, the sealing ribs of the second shell are nested in the sealing grooves of the first shell to form a mechanical seal.

[0036] Working principle:

[0037] The excitation source 4 acts according to the received trigger signal to release high-pressure gas, and the high-pressure gas serves as a driving force to drive the piston 5 to displace along the cavity. The conductive row impact end of the piston 5 enters the conductive row breaking part 701 to cut off the conductive row, and then the piston 5 continues to displace. The melt impact end of the piston 5 drives the melt breaking assembly to displace along the displacement channel to break the melt.

[0038] When the conductive row is broken, the current on the conductive row flows through the melt. Since the resistance of the melt is much larger than the resistance of the conductive row, the current flowing through the melt is limited, the current is reduced, the arc generated when the melt is broken is relatively small, and the arc is extinguished through the arc extinguishing medium. The arc extinguishing medium can absorb heat and cool down, thereby ensuring the safety and reliability of the product function implementation process. In addition, since the four arc extinguishing cavities are independently arranged, there is no arc between the four arc extinguishing cavities, which improves the arc extinguishing reliability.

Claims

1. A high breaking small volume energized fuse, characterized in that, The first shell, the second shell and the third shell are spliced together, and a cavity is arranged in the first shell, the second shell and the third shell; The excitation source and the piston are arranged in the cavity in the first shell in sequence; The conductive row is integrally injection molded with the third shell in a U-shaped structure, two ends of the conductive row are respectively extended to both sides of an end of the third shell away from the second shell and flush with the end of the third shell, and the part of the conductive row to be disconnected is located at an end of the second shell adjacent to the third shell and in the cavity; An arc-extinguishing chamber filled with arc-extinguishing medium is formed in the second shell on the side of the conductive row facing the excitation source and located on the outer circumferential side of the cavity, and a fuse is arranged in the arc-extinguishing chamber in parallel with the conductive row; When the excitation source releases high-pressure gas to drive the piston to displace along the cavity, the piston first disconnects the conductive row at the part of the conductive row to be disconnected and then disconnects the fuse.

2. The energized fuse of claim 1, wherein, The piston comprises a conductive row impact end and a fuse impact end, the conductive row impact end is arranged through the second shell corresponding to the part of the conductive row to be disconnected, and the fuse impact end is located in the cavity of the first shell; when the piston displaces, the conductive row impact end of the piston disconnects the conductive row, and the fuse impact end disconnects the fuse.

3. The energized fuse of claim 2, wherein, A displacement channel for disconnecting the fuse is arranged in the second shell on the outer side of the cavity and is used for disconnecting the fuse, a fuse disconnecting assembly is arranged in the displacement channel, the fuse passes through the arc-extinguishing chamber and the displacement channel and is located on the displacement path of the fuse disconnecting assembly; the conductive row impact end of the piston is arranged in the cavity in the second shell, and the fuse impact end is arranged corresponding to the fuse disconnecting assembly in the displacement channel; the conductive row impact end disconnects the conductive row, and the fuse impact end drives the fuse disconnecting assembly to displace to disconnect the fuse.

4. The energized fuse of claim 3, wherein, Four independent arc-extinguishing chambers are arranged in the second shell around the outer circumferential side of the displacement path of the piston, one end of each arc-extinguishing chamber is closed and the other end is open, the open end of each arc-extinguishing chamber is arranged in the direction of the first shell, and the end face of the first shell closes the arc-extinguishing chamber in the second shell.

5. The energized fuse of claim 4, wherein, The fuse has a hollow structure, the hollow part of the fuse is sleeved on the outer circumferential side of the cavity of the second shell, the fuse is located in the arc-extinguishing chamber, and the conductive row impact end of the piston passes through the hollow part of the fuse and is located in the cavity in the second shell.

6. The energized fuse of claim 1, wherein, Mechanical seal structures are arranged between the contact surfaces of the first shell and the second shell and between the contact surfaces of the second shell and the third shell.

7. The energized fuse of claim 6, wherein, The mechanical seal structure comprises a sealing groove and a sealing rib, the sealing groove and the sealing rib are arranged on the two contact end faces of the adjacent first shell and second shell and the two contact end faces of the adjacent second shell and third shell, and the sealing rib is nested in the sealing groove.

8. The energized fuse of claim 1, wherein, A groove structure is arranged on the end face of the third shell away from the second shell, and a base is arranged in the groove structure; the cavity in the third shell for the disconnected part of the conductive row is through the two ends of the third shell, and a receiving groove is arranged on the base at the position corresponding to the cavity.

9. The energized fuse of claim 1, wherein, The first shell is integrally injection molded with the excitation source.

10. The energizing fuse of any one of claims 1 to 9, wherein, A sleeve is arranged in the cavity of the first shell, the piston is arranged in the sleeve, and the high-pressure gas release end of the excitation source is located in the sleeve.

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