Highly integrated excitation fuse

Abstract

The highly-integrated excitation fuse comprises a first shell and a second shell which are spliced, and the first shell and the second shell are provided with through cavities; the excitation source and the piston are sequentially arranged in a hollow cavity of the first shell; the conducting bar and the second 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 the end portion of the end, away from the first shell, of the second shell and are flush with the end face of the end portion, and the portion, needing to be disconnected, of the conducting bar is located on the displacement path of the piston. When the excitation source acts according to the received trigger signal, high-pressure gas is released to drive the piston to move, and the piston disconnects the conducting bar from the portion, needing to be disconnected, of the conducting bar. The conducting bar and the second shell are integrally formed in the shape like the Chinese character'ji ', so that the number of parts and assembly surfaces are reduced, arc crossing caused by the assembly surfaces is avoided, and the safety performance is improved.

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 energized fuse for circuit protection. BACKGROUND

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

[0003] The purpose of the present application is to provide a highly integrated energized fuse. The U-shaped conductive row and the shell are injection molded to make the breaking part of the energized fuse located in the middle of the shell, and the connecting end of the energized fuse located at one end of the shell, thereby reducing the number of parts and assembly surfaces of the energized fuse, avoiding arc-over due to the assembly surface, improving the working safety of the energized fuse, and making the energized fuse suitable for various installation scenes.

[0004] To achieve the above-mentioned purpose, the technical scheme provided by the present application is a highly integrated energized fuse, which comprises a spliced first shell and a second shell, and the first shell and the second shell are provided with a through cavity.

[0005] The energizing source and the piston are sequentially arranged in the cavity of the first shell.

[0006] The conductive row is integrally injection molded with the second shell in a U-shaped structure, both ends of the conductive row are extended to both sides of the end of the second shell away from the first shell and flush with the end face of the end, and the part of the conductive row to be broken is located on the displacement path of the piston.

[0007] When the energizing source acts according to the received trigger signal to release high-pressure gas to drive the displacement of the piston, the piston breaks the conductive row at the part of the conductive row to be broken.

[0008] Preferably, a fuse is connected in parallel with the conductive strip, two ends of the fuse are located on both sides of the part of the conductive strip to be disconnected along the length direction, the fuse is located on the displacement path of the piston, or the fuse is located in front of the displacement path of the piston, when the fuse is located in front of the displacement path of the piston, a fuse disconnecting assembly is arranged on the displacement path of the piston, the fuse disconnecting assembly is arranged corresponding to the fuse, when the piston disconnects the conductive strip, the piston disconnects the fuse, or when the piston disconnects the conductive strip, the piston drives the fuse disconnecting assembly to displace, and the fuse disconnecting assembly disconnects the fuse.

[0009] Preferably, a base is further arranged, the base is nested in the end of the second shell away from the first shell, corresponding impact ends of the second shell and the base opposite to each other are respectively provided with opposite bosses facing each other, a displacement through hole is arranged in the boss of the second shell and penetrates through both ends of the second shell, a displacement groove is arranged on the boss of the base corresponding to the displacement through hole, and the displacement through hole of the second shell and the displacement groove on the base form a displacement channel; the part of the conductive strip to be disconnected is located in the displacement channel, a fuse is arranged between the second shell and the base and penetrates through the displacement channel, two ends of the fuse are electrically connected with the conductive strip, a fuse disconnecting assembly is arranged in the displacement channel on the side of the conductive strip away from the piston, and the fuse located in the displacement channel is located on the displacement path of the fuse disconnecting assembly; when the excitation source acts according to the received trigger signal, high-pressure gas is released to drive the piston to displace, after the impact end of the piston disconnects the conductive strip from the part of the conductive strip to be disconnected, the piston drives the fuse disconnecting assembly to displace to disconnect the fuse.

[0010] Preferably, an arc extinguishing medium is filled in an arc extinguishing cavity formed between the second shell, the base and the displacement channel, and the fuse is arranged in the arc extinguishing medium.

[0011] Preferably, a sleeve is arranged in the first shell, and the piston is located in the sleeve; a ring-shaped groove is formed on the end face of the second shell facing the first shell corresponding to the sleeve, the sleeve is nested in the ring-shaped groove, and the displacement through hole is located in the ring-shaped groove.

[0012] Preferably, a through hole in communication with the arc extinguishing cavity is arranged on the shell corresponding to opposite sides of the conductive strip outside the periphery of the ring-shaped groove, the conductive strip penetrates through the through hole, conductive sheets are electrically connected with two ends of the fuse, and the conductive sheets at two ends of the fuse respectively penetrate through the gap between the through hole and the conductive strip, are electrically connected with the conductive strip and seal the gap.

[0013] Preferably, positioning notches are formed on opposite sides of the end face of the second shell towards the first shell, and the through hole is located in the positioning notches; positioning protrusions are arranged at the corresponding positions of the end face of the first shell towards the second shell, and the positioning protrusions of the first shell are clamped in the positioning notches of the second shell.

[0014] Preferably, a nested mechanical sealing structure is arranged between the contact area of the base and the second shell.

[0015] Preferably, the end of the second shell towards the base is an open end, a mounting step is arranged on the open end, an annular positioning groove is arranged on the surface of the mounting step, and an annular positioning protrusion is formed on the end face of the base towards the second shell and corresponds to the positioning groove; the positioning protrusion of the base is nested in the positioning groove of the second shell.

[0016] Preferably, the first shell is integrally injection molded with the excitation source.

[0017] Preferably, mounting holes are not formed on both ends of the conductive row outside the shell, and when the excitation fuse is installed, both ends of the conductive row are connected and fixed by welding.

[0018] The highly integrated excitation fuse of the application is injection molded with the shell in a U-shaped conductive row, so that the connection end of the excitation fuse is located at the end of the excitation fuse shell, which facilitates the installation of the excitation fuse, reduces the installation connection space, makes the connection more stable, and enables the excitation fuse to be located on one side of the user end, so that the connection end of the excitation fuse can directly contact the product of the user end, thereby meeting some special installation requirements of the user end.

[0019] The U-shaped conductive row can enhance the impact resistance of the side wall of the shell.

[0020] The injection molding of the conductive row and the shell, the assembly between the first shell, the second shell integrally injection molded with the conductive row and the base, reduce the number of parts and the assembly surface, facilitate the assembly, and at the same time, the assembly surface is sealed by mechanical sealing, avoiding the use of sealing elements, and preventing the overflow of electric arc. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a schematic diagram of the three-dimensional appearance structure.

[0022] Figure 2 is a schematic diagram of the cross-sectional structure of Figure 1 .

[0023] Figure 3 is a schematic diagram of the three-dimensional structure of the conductive row and the second shell.

[0024] Figure 4 is Figure 3 a sectional structure schematic view.

[0025] Figure 5 is a structure schematic view between the sleeve, the conductive row and the second shell integrated structure.

[0026] Reference signs:

[0027] The first shell 1, the second shell 2, the base 3, the excitation source 4, the piston 5, the sleeve 6, the conductive row 7, the melt 8, the boss 201, the displacement through hole 202, the annular groove 203, the mounting step 204, the positioning groove 205, the through hole 206, the positioning notch 207, the boss 301, the connector 401, the sealing element 501, the conductive row to be disconnected part 701, the conductive sheet 801, the push rod 901, the guide rod 902. DETAILED DESCRIPTION

[0028] The highly integrated excitation fuse of the application comprises spliced first and second shells, the first and second shells are provided with a through cavity; an excitation source and a piston are sequentially arranged in the cavity of the first shell; a conductive row is integrally injection molded with the second shell in a U-shaped structure, both ends of the conductive row are extended to both sides of the end of the second shell away from the first shell and flush with the end face of the end, and the part of the conductive row to be disconnected is located on the displacement path of the piston; when the excitation source acts according to the received trigger signal, high-pressure gas is released to drive the piston to displace, and the piston disconnects the conductive row at the part to be disconnected.

[0029] The preferred embodiments are specifically described below in combination with the drawings. The orientation-related words only refer to the orientation shown in the drawings and do not constitute a limitation on the technical scheme of the application.

[0030] The highly integrated excitation fuse of the application, referring to Figures 1 to 5 , comprises a first shell 1, a second shell 2, a base 3, an excitation source 4, a piston 5, a sleeve 6, a conductive row 7, a melt 8 and a melt disconnection assembly.

[0031] The first shell 1, the second shell 2 and the base 3 are sequentially spliced to form an excitation fuse shell, and the first shell 1, the second shell 2 and the base 3 are fixed by bolts. A through cavity is formed in the first shell 1, the second shell 2 and the base 3.

[0032] The cavity of the first shell 1 is sequentially provided with an excitation source 4 and a piston 5, 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 is supported by a sleeve 6 located in the cavity of the first shell 1, the excitation source 4 closes one end of the cavity of the first shell 1, and the sleeve 6 is in close contact with the inner wall of 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 6 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 6 of the first shell 1, and a ring of sealing members 501 is arranged on the outer circumferential surface of the piston 5 in contact with the sleeve 6, for sealing the contact surface between the piston 5 and the sleeve 6. 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. In this embodiment, the impact end of the piston 5 is two, corresponding to the conductive row to be disconnected part 701.

[0033] The second shell 2 and the conductive row 7 are integrally formed by insert molding, and the second shell 2 is provided with a shell wall through which the conductive row 7 passes, which can enhance the strength of the shell wall of the second shell. The conductive row 7 is in the shape of a U and is located in the second shell 2. The conductive row to be disconnected part 701 is located at one end of the second shell 2 facing the first shell 1, and the two ends of the conductive row 7 are located at the two outer sides of the end of the second shell facing the base as the connection ends of the excitation fuse, and the two ends of the conductive row 7 are flush with the end of the second shell 2 facing the base. The two ends of the conductive row 7 as the connection ends are not provided with mounting holes in this embodiment, and when installed, they can be installed by welding. In other embodiments, mounting holes can be provided for mounting connection. The vertical distance between the conductive row to be disconnected part and the two ends of the conductive row as the connection ends is greater than or equal to the displacement distance of the piston after disconnecting the conductive row. By insert molding the U-shaped conductive row and the second shell, a piston displacement space can be reserved in the second shell, so that the piston displacement space after disconnecting the conductive row is located in the groove formed by the conductive row. The conductive row to be disconnected part 701 is formed by two disconnected weak parts arranged at intervals.

[0034] The open end of the second shell 2 is located towards the base 3, and a boss 201 corresponding to the piston impact end and the part of the conductive row to be disconnected is integrally formed on the end face of the second shell 2 towards the base 3. A displacement through hole 202 is formed on the boss 201 along the displacement direction of the piston, and the part of the conductive row to be disconnected 701 is arranged in the displacement through hole. An annular groove 203 is formed on the end face of the second shell 2 corresponding to the sleeve 6, and the displacement through hole 202 is located in the annular groove 203. The end of the sleeve 6 towards the second shell 2 is nested in the annular groove 203 of the second shell 2, thereby supporting the sleeve 6, and the nested structure of the sleeve 6 and the annular groove of the end face of the second shell realizes the sealing between the contact surfaces of the first shell and the second shell, thereby preventing the electric arc generated when the piston is disconnected from the part of the conductive row to be disconnected from overflowing from the outer circumferential side of the contact surface of the sleeve 6.

[0035] A mounting step 204 is arranged on the open end of the second shell 2, and an annular positioning groove 205 is formed on the step face of the mounting step 204. An annular positioning convex edge corresponding to the positioning groove 205 is arranged on the base 3, and when the base 3 is assembled into the open end of the second shell, the positioning convex edge of the base 3 is nested into the positioning groove 205 of the open end of the second shell 2 to realize the mounting and positioning of the base 3, and the mechanical sealing between the base and the second shell is realized through the positioning groove and the positioning convex edge. The boss 201 is located between the second shell 2 and the base 3. A corresponding boss 301 is also formed on the end face of the base 3 towards the second shell 2 corresponding to the boss 201, and in this embodiment, a gap is reserved between the boss 201 and the corresponding boss 301. A displacement groove corresponding to the displacement through hole 202 is formed on the boss 301, and the displacement through hole of the second shell and the displacement groove of the base form a displacement channel. A melt disconnecting assembly is arranged in the displacement channel formed in the boss 201 and the boss 301, the melt disconnecting assembly seals the gap between the boss 201 and the boss 301, and a plurality of arc extinguishing cavities are formed between the boss 201, the melt disconnecting assembly, the boss 301, and the second shell and the base.

[0036] A through hole 206 is formed on the end face of the second shell 2 towards the first shell 1 on the opposite sides of the annular groove 203, the conductive row 7 passes through the through hole 206, and a gap for the conductive sheet 801 to pass through is reserved between the conductive row 7 and the through hole 206. The through hole 206 communicates with the arc extinguishing chamber between the second shell and the base. Positioning notches 207 are respectively formed on the opposite sides of the second shell 2 where the through hole 206 is located, the through hole 206 is located in the positioning notches 207, and the positioning notches 207 are located outside the annular groove 203. Positioning protrusions corresponding to the positioning notches 207 are formed on the end face of the first shell 1 towards the second shell 2, and the positioning protrusions of the first shell are clamped in the positioning notches 207 of the second shell for positioning.

[0037] The melt breaking assembly comprises a nested connecting push rod 901 and a guide rod 902, and the connecting end of the push rod and the guide rod is connected through a concave-convex nested structure. The guide rod is located in the boss 301, the push rod is located in the boss 201, and the push rod is nested into the end of the guide rod. Limiting blocks are arranged on the opposite sides of the guide rod, and the limiting blocks are arranged at the end surface of the boss 301 to limit the guide rod and the push rod. The connecting part of 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.

[0038] The melt 8 is arranged in the arc extinguishing chamber between the second shell 2 and the base 3, and the melt 8 passes through the space between the push rod and the guide rod of the melt breaking assembly in the displacement channel and is clamped and fixed by the push rod and the guide rod. The conductive sheets 801 are electrically connected to the two ends of the melt 8, the conductive sheets 801 are inserted into the gap between the through holes 20 of the conductive strip 7, and the conductive sheets 801 are electrically connected to the conductive strip 7 to connect the melt 8 in parallel with the conductive strip 7.

[0039] The filling hole for filling the arc extinguishing medium is arranged on the base, the arc extinguishing medium is filled into the arc extinguishing chamber, and the melt 8 is located in the arc extinguishing medium. The filling hole for filling the arc extinguishing medium on the base is closed by a plug.

[0040] Working principle:

[0041] 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 sleeve 6. The impact end of the piston 5 enters the displacement channel to cut off the conductive strip from the conductive strip part 701 to be disconnected. The piston 5 continues to displace to push the melt breaking assembly to displace and break the melt.

[0042] When the conductive strip is disconnected, the current on the conductive strip flows through the melt. Since the resistance of the melt is much larger than the resistance of the conductive strip, the current flowing through the melt is limited, the current is reduced, the arc generated when the melt is disconnected is relatively small, the arc is extinguished by 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.

Claims

1. A highly integrated energized fuse, characterized by, The first shell and the second shell are spliced, and the first shell and the second shell are provided with a through cavity; The excitation source and the piston are sequentially arranged in the cavity of the first shell; The conductive row is integrally injection molded with the second shell in a U-shaped structure, two ends of the conductive row extend to both sides of the end of the second shell away from the first shell and are flush with the end face of the end, and the part of the conductive row to be disconnected is located on the displacement path of the piston; When the excitation source acts according to the received trigger signal, high-pressure gas is released to drive the piston to displace, and the piston disconnects the conductive row from the part of the conductive row to be disconnected.

2. The energized fuse of claim 1, wherein, A fuse is connected in parallel on the conductive row, two ends of the fuse are located on both sides of the part of the conductive row to be disconnected in the length direction, the fuse is located on the displacement path of the piston, or the fuse is located in front of the displacement path of the piston, when the fuse is located in front of the displacement path of the piston, a fuse disconnecting assembly is arranged on the displacement path of the piston, the fuse disconnecting assembly corresponds to the fuse, when the piston disconnects the conductive row, the piston disconnects the fuse, or when the piston disconnects the conductive row, the piston drives the fuse disconnecting assembly to displace, and the fuse disconnecting assembly disconnects the fuse.

3. The energized fuse of claim 2, wherein, A base is further included, the base is nested in the end of the second shell away from the first shell, opposite bosses facing each other are respectively arranged on the opposite ends of the second shell and the base corresponding to the impact end of the piston, a displacement through hole penetrating through both ends of the second shell is arranged on the boss of the second shell, and a displacement groove is arranged on the boss of the base corresponding to the displacement through hole, and the displacement through hole of the second shell and the displacement groove on the base form a displacement channel; The part of the conductive row to be disconnected is located in the displacement channel, the fuse is arranged between the second shell and the base and penetrates through the displacement channel, two ends of the fuse are in conductive connection with the conductive row, a fuse disconnecting assembly is arranged in the displacement channel on the side of the conductive row away from the piston, the fuse located in the displacement channel is located on the displacement path of the fuse disconnecting assembly, when the excitation source acts according to the received trigger signal, high-pressure gas is released to drive the piston to displace, and after the impact end of the piston disconnects the conductive row from the part of the conductive row to be disconnected, the piston drives the fuse disconnecting assembly to displace and disconnect the fuse.

4. The energized fuse of claim 3, wherein, An arc extinguishing medium is filled in an arc extinguishing cavity formed between the second shell, the base and the displacement channel, and the fuse is arranged in the arc extinguishing medium.

5. The energized fuse of claim 3, wherein, A sleeve is arranged in the first shell, and the piston is located in the sleeve; an annular groove is formed in the end face of the second shell facing the first shell and corresponding to the sleeve, and the sleeve is nested in the annular groove; and the displacement through hole is located in the annular groove.

6. The energized fuse of claim 5, wherein, The through hole in communication with the arc-extinguishing cavity is arranged on the shell corresponding to the opposite sides of the conductive row outside the periphery of the annular groove, the conductive row passes through the through hole, the two ends of the fuse are conductively connected with the conductive sheets, the conductive sheets at the two ends of the fuse respectively pass through the gap between the through hole and the conductive row, are conductively connected with the conductive row and close the gap.

7. The energized fuse of claim 5, wherein, Positioning notches are respectively arranged on opposite sides of the end surface of the second shell facing the first shell, and the through hole is located in the positioning notches; positioning protrusions are arranged at positions corresponding to the end surface of the first shell facing the second shell, and the positioning protrusions of the first shell are clamped in the positioning notches of the second shell.

8. The energized fuse of claim 3, wherein, A nested mechanical sealing structure is arranged between the contact area of the base and the second shell.

9. The energized fuse of claim 7, wherein, The end of the second shell facing the base is an open end, a mounting step is arranged on the open end, an annular positioning groove is arranged on the surface of the mounting step, and an annular positioning protrusion corresponding to the positioning groove is arranged on the end surface of the base facing the second shell, and the positioning protrusion of the base is nested in the positioning groove of the second shell.

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

11. The energized fuse of claim 1, wherein, The two ends of the conductive row outside the shell are not provided with mounting holes, and the two ends of the conductive row are fixed by welding when the excitation fuse is installed.

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