Large-current excitation fuse

Abstract

The high-current excitation fuse comprises a shell, a conducting bar, an electronic ignition device and a piston, the shell comprises a first shell and a second shell which are spliced, and the conducting bar is arranged between the contact surfaces of the first shell and the second shell in a penetrating mode. Mechanical sealing structures are respectively arranged between the contact surfaces of the first shell and the second shell and between the contact surfaces of the first shell and the conducting bar and between the second shell and the conducting bar, so that the shell forms a sealed shell; the mechanical sealing structure is characterized in that a first sealing rib and a first sealing groove which are nested with each other are arranged on the direct contact surfaces of the first shell and the second shell respectively to form the mechanical sealing structure; second sealing ribs are respectively arranged on the contact surfaces of the first shell and the second shell in contact with the upper and lower surfaces of the conducting bar; and the second sealing ribs are in sealing contact with the upper and lower surfaces of the conducting bar to form a mechanical sealing structure. The utility model has the advantages of simple structure, few parts, high assembly efficiency and high mechanical sealing performance of the product.

Description

Technical Field

[0001] This utility model relates to the fields of power control and electric vehicles, and in particular to a high-current excitation fuse for rapid disconnection of the main circuit of an electrical fault. Background Technology

[0002] The main circuit of an electric vehicle battery pack contains numerous electrical loads, such as the distribution box, controller, and motor. Branch circuits from the distribution box further contain a large number of electrical loads, including heaters, compressors, and audio-visual instrument systems. When a fault occurs in the circuit, circuit protection devices are needed to protect these loads. In addition to traditional thermal fuses, main circuit protection devices also include excitation devices that use pyrotechnic devices to quickly cut off openings and employ fusible arc extinguishing. Generally, one or a combination of these devices is used to protect the battery pack's circuit. When a small fault current occurs in the circuit, the vehicle control system controls the excitation circuit breaker to activate, short-circuiting the positive and negative cables connected to the excitation circuit breaker. The fault current flows through the short-circuit loop, protecting the electrical loads. Simultaneously, due to the short circuit, the current in the circuit increases sharply, and the system circuit detects the abnormal short-circuit current. The fuse quickly blows or the excitation device quickly activates, thus disconnecting the circuit. For large fault currents, the excitation circuit breaker can be activated as needed, or the protection device can be activated directly. After the fuse is activated, it can quickly disconnect the fault current, thus protecting the electrical loads in the downstream circuit.

[0003] For existing excitation fuses, see Figure 1 The system mainly comprises a first housing 10 and a second housing 11 that are spliced ​​together. An electronic ignition device 12 is located at the top of the cavity of the first housing 10. The electronic ignition device 12 is fixed within the first housing 10 by a protective cover 13 and a pressure plate 14 located on the top of the first housing 10. A connector 18 is provided outside the electronic ignition device 12. A metal cover 15 protecting the electronic ignition device 12 is also provided within the first housing 10. A conductive bar 16 passes between the first and second housings, and a piston 17 is located within the first housing 10.

[0004] Existing excitation fuses have the following problems: existing solutions have many components and complex assembly processes; the housing of the excitation fuse has poor sealing performance, which can easily cause high-temperature arc gas to be ejected, potentially causing short circuits or malfunctions in other circuits, potentially leading to equipment burnout or personal injury; due to poor sealing performance, the excitation fuse generates a lot of noise during operation; and existing solutions are costly. Summary of the Invention

[0005] The utility model discloses a purpose is the incentive fuse of large current, the protection cover of fixed electronic ignition device, pressing plate and other parts function of positioning and protection to electronic ignition device are integrated in the first casing, and the sealing design is carried out through the self structure between the spliced first casing and second casing, improve the casing sealing performance of incentive fuse, simultaneously, reduce assembly procedure, reduce production cost.

[0006] In order to realize above-mentioned purpose, the utility model discloses technical scheme is the incentive fuse of large current, including casing, conducting row, electronic ignition device, piston, the casing includes spliced first casing and second casing, the conducting row is arranged between the contact surface of first casing and second casing, and the electronic ignition device and the piston are located in the first casing respectively, and the piston sets up corresponding the conducting row, and the contact surface between the first casing and the second casing, the contact surface between the first casing and second casing and the conducting row contact respectively is provided with mechanical seal structure, and the casing forms sealed casing, and the mechanical seal structure includes: the contact surface of the first casing and second casing direct contact is provided with the first sealing rib and first sealing groove nested each other respectively, and the mechanical seal structure is formed, and the contact surface of the first casing and second casing is provided with the second sealing rib on the upper and lower surface of the conducting row, and the mechanical seal structure is formed by the sealing contact of the second sealing rib and the upper and lower surface of the conducting row.

[0007] Preferably, the third sealing rib is arranged at the bottom of the first sealing groove, and when the first sealing rib is nested in the first sealing groove, the first sealing rib abuts against the third sealing rib to crush the third sealing rib.

[0008] Preferably, the fourth sealing rib and the fourth sealing groove nested mechanical seal structure are arranged at the contact surface of the first casing and the second casing on the outer circumferential side of the first sealing rib and the first sealing groove.

[0009] Preferably, the second sealing rib on the second casing is a U-shaped groove structure, and when the first casing, the conducting row and the second casing are assembled, the material of the notch part of the U-shaped groove structure is crushed, and part of the crushed material is filled into the groove of the U-shaped groove structure.

[0010] Preferably, the conducting row between the first casing and the second casing is provided with positioning notches on opposite sides, and the first limiting rib corresponding to the positioning notches is arranged in the positioning notches in an interference fit manner to limit the conducting row.

[0011] Preferably, first mounting bosses are correspondingly arranged at the contact surfaces of the first shell and the second shell through which the conductive row passes, threaded holes are arranged in the first mounting bosses, first through holes are arranged on the conductive row at positions corresponding to the first mounting bosses, the first mounting bosses on the first shell and the second shell pass through the first through holes of the conductive row, and the first mounting bosses are butted in the first through holes, and screws pass through the threaded holes of the first mounting bosses to connect and fix the first shell, the conductive row and the second shell; the second sealing ribs are located on both sides of the first mounting bosses and are connected with the outer side surfaces of the first mounting bosses.

[0012] Preferably, second mounting bosses and first mounting counterbores for nesting the second mounting bosses are arranged at positions of the first sealing ribs and the first sealing grooves at the contact surfaces of the first shell and the second shell, threaded holes are arranged in the second mounting bosses and the first mounting counterbores, and screws pass through the second mounting bosses and the first mounting counterbores to connect the first shell and the second shell.

[0013] Preferably, the conductive row has a U-shaped bending structure, the wiring end of the conductive row has a double-layer structure, and the double-layer structure extends to both sides of the bottom of the U-shaped groove of the U-shaped bending structure.

[0014] Preferably, limiting notches are arranged on both sides of the bottom of the vertical feature of the conductive row respectively, vertical second limiting ribs are arranged in the cavity of the second shell at positions through which the vertical feature of the conductive row passes respectively, and a third limiting rib is arranged on the inner wall of the cavity of the second shell at a position corresponding to the limiting notches, so that the position of the conductive row is limited by the first limiting rib, the second limiting rib and the third limiting rib.

[0015] The large-current fuse has the following advantages: the first shell is integrated with the positioning and protection functions of the electronic ignition device, the electronic ignition device is directly arranged in the first shell, the external metal sheath and the connector and other components of the electronic ignition device are cancelled, the product structure is simplified, the assembly process is simplified, and the assembly efficiency is improved.

[0016] The direct contact surfaces between the first shell and the second shell are alternately arranged in a double-layer sub-mother sealing groove structure and a single-layer sub-mother sealing groove structure, so as to increase the curve path of the high-temperature gas, achieve the purpose of gas cooling and buffering heat energy, and disperse the synchronism of the gas; the notches of the first shell and the second shell in contact with the conductive row are provided with sealing ribs and limiting ribs on the side surfaces, the sealing ribs are crushed and the limiting ribs are interference-fitted during assembly, the conductive row is in full-sealed contact with the contact surfaces of the first shell and the second shell, the internal and external spaces are separated, a relatively sealed space is formed in the product, and the overall sealing performance of the contact surfaces of the first shell and the second shell is improved.

[0017] The double-layer bending structure of the conductive row connecting terminal saves the processing material of the conductive row and makes the processing of the conductive row more convenient. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structural schematic diagram of an existing incentive fuse.

[0019] Figure 2 is a structural schematic diagram of a section from the first shell, the second shell and the conductive row connecting screw position.

[0020] Figure 3 is a structural schematic diagram of a section from the first shell and the second shell directly connected screw position.

[0021] Figure 4 is a structural schematic diagram of the first shell.

[0022] Figure 5 is a structural schematic diagram of the second shell.

[0023] Figure 6 is a structural schematic diagram of a section from the first shell and the second shell directly connected screw position and a partial enlarged view A.

[0024] Figure 7 is a structural schematic diagram of a section from the first shell, the second shell and the conductive row connecting screw position and a partial enlarged view B.

[0025] Figure 8 is a structural schematic diagram of a section from the first shell, the second shell and the conductive row splicing splicing surface and a partial enlarged view C.

[0026] Figure 9 is a structural schematic diagram of the conductive row.

[0027] REFERENCE NUMERALS:

[0028] Screw 5, screw 7, first shell 10, second shell 11, electronic ignition device 12, protective cover 13, pressing plate 14, metal cover 15, conductive row 16, piston 17, connector 18, first shell 20, first sealing rib 201, arc rib 202, second sealing rib 203, first mounting boss 204, notch 205, fourth sealing groove 206, positioning notch 207, second mounting boss 210, conductive row 30, terminal 301, positioning groove 302, connecting hole 303, connecting hole 304, second shell 40, second sealing rib 401, first sealing groove 402, second sealing rib 403, third limiting rib 404, first mounting boss 405, first limiting rib 406, second limiting rib 407, notch 408, positioning boss 409, third sealing rib 410, first mounting counterbore 412, piston 50, electronic ignition device 60. DETAILED DESCRIPTION

[0029] The large-current excitation fuse of the utility model, including shell, conductive row, electronic ignition device, piston, the shell includes spliced first shell and second shell, the conductive row is worn between the contact surface of first shell and second shell, and the electronic ignition device and the piston are located in the first shell respectively, and the piston is set up corresponding the conductive row, and the contact surface between the first shell and the second shell and the contact surface between the first shell and the second shell and the conductive row are respectively provided with mechanical sealing structure to make the shell form sealed shell, and the mechanical sealing structure includes: the contact surface of the first shell and the second shell is directly contacted respectively provided with the first sealing rib and the first sealing groove of mutual nesting to form mechanical sealing structure, and the contact surface of the first shell and the second shell contacted with the upper and lower surfaces of the conductive row is respectively provided with the second sealing rib, and the second sealing rib is sealed with the upper and lower surfaces of the conductive row to form mechanical sealing structure.

[0030] The preferred embodiments are described below in detail with reference to the drawings. The orientation words involved only refer to the orientation shown in the drawings and do not constitute a limitation on the technical scheme of the utility model.

[0031] The large-current excitation fuse of the utility model, including shell, conductive row, electronic ignition device, piston. Referring to Figures 2 to 9The shell comprises a spliced first shell 20 and a second shell 40. The first shell 20 integrates the functions of the fixed parts of the electronic ignition device 60, and has a through cavity. The inner wall of the through cavity of the first shell 20 away from the second shell 40 is provided with a positioning conical surface structure. The electronic ignition device 60 is arranged in the cavity end of the first shell 20 away from the second shell 40, and is fixed by interference, adhesion or embedded injection molding, so as to seal the contact surface between the electronic ignition device and the first shell, and the signal receiving end of the electronic ignition device is located outside the shell. In this example, the positioning conical surface structure in the cavity of the first shell is assembled by interference, which plays a positioning and protection role for the first shell 20. The piston 50 is arranged in the cavity of the first shell 20, and the impact end of the piston 50 corresponds to the conductive row 30. The piston 50 is in sealing contact with the inner wall of the cavity of the first shell 20, which can be realized by arranging a sealing element on the outer circumferential surface of the piston 50 in contact with the inner wall of the cavity of the first shell 20, or by interference fit.

[0032] A notch 205 for the conductive row 24 is arranged on the end surface of the spliced first shell 20 and second shell 40, and a first mounting boss 204 is arranged at the center position of the notch 205. A threaded hole for the screw is arranged on the first mounting boss 204. Second sealing ribs 203 in line type are arranged on both sides of the two notches 205 along the circumferential direction. The second sealing ribs 203 in line type are arranged on the opposite sides of the first mounting boss 204 along the circumferential direction, and are connected with the outer circumferential surface of the first mounting boss 204. Fourth sealing grooves 206 and first sealing ribs 201 are arranged on the end surface of the first shell 20 on the opposite sides of the notch 205 along the circumferential direction. The first sealing ribs 201 are arranged on the inner side of the fourth sealing grooves 206 and are adjacent. Arc-shaped ribs 202 of the first shell 20 are arranged on the inner side of the side surface of the first shell 20 of the notch 205, which are used to press and position the conductive row 30 in the arc-shaped bending part in the shell. Positioning notches 207 are arranged on the end surface of the first shell 20 on the outer side of the fourth sealing grooves 206. Second mounting bosses 210 are arranged on the end surface of the first shell 20 on the inner side of the positioning notches 207. Threaded holes for the screw 7 are arranged on the second mounting bosses 210. The first sealing ribs 201 are arranged on the opposite sides of the second mounting bosses 210 along the circumferential direction, and are connected with the outer circumferential surface of the second mounting bosses 210.

[0033] The end face of the second shell 40, which is spliced with the first shell 20, is provided with a corresponding gap 408 for the conductive strip 24 to pass through, and a corresponding positioning protrusion 409 is arranged at the corresponding positioning gap 207. The two sides of the gap 408 along the circumference of the second shell 40 are respectively provided with a U-shaped second sealing rib 401, which has a U-shaped groove with the opening end facing the direction of the conductive plate 30. A first mounting protrusion 405 is arranged at the position of the first mounting protrusion 204 of the first shell 20 corresponding to the gap 408, and a threaded hole is arranged at the first mounting protrusion 405 for a screw to pass through. A first sealing groove 402 is arranged on the end face of the second shell 40 corresponding to the first sealing rib 201 on the two sides along the circumference of the gap 408, a third sealing rib 403 is arranged in the first sealing groove 402, and a fourth sealing rib 410 is arranged corresponding to the fourth sealing groove 206 on the end face of the second shell 40 outside the first sealing groove 402. When the first shell and the second shell are assembled, the first sealing rib 201 is nested in the first sealing groove 402 and crushes the third sealing rib 403 to form a double-layered primary and secondary sealing groove structure. The fourth sealing rib 410 is nested in the fourth sealing groove 206 to form a single-layered primary and secondary sealing groove structure, and a double mechanical sealing structure is formed at the contact surface of the first shell and the second shell by the double-layered primary and secondary sealing groove structure and the single-layered primary and secondary sealing groove structure, thereby improving the sealing performance of the shell.

[0034] The two side faces of the gap 408 on the second shell 40 are respectively provided with a first limiting rib 406, which is located on the side of the fourth sealing rib 410 at the gap 408. After the first shell and the second shell are assembled, the first limiting rib 406 is in interference fit in the positioning groove 302 in the width direction of the conductive strip 30 to limit the position of the conductive strip 30. A third limiting rib 404 is arranged transversely in the cavity of the second shell 40 to support the wire end of the conductive strip 30, which is bent and overlapped, to extend to the limiting gap arranged at the side wall of the second shell. A first mounting counterbore 412 is arranged at the position corresponding to the second mounting protrusion 210 of the second shell 40, and the first mounting counterbore 412 is a threaded hole. During assembly, the second mounting protrusion 210 is inserted into the first mounting counterbore 412, and the screw 7 passes through the first shell 20 and the second shell 40, the second mounting protrusion 210, and the first mounting counterbore 412 to connect and fix the first shell 20 and the second shell 40. Through the cooperation of the second mounting protrusion 210 and the first mounting counterbore 412, the sealing performance between the contact surfaces of the first shell and the second shell is improved.

[0035] The conductive strip 30, referring to Figure 9, the two ends of the opening of the U-shaped structure are respectively folded outward to form a structure. The two ends of the conductive row 30 are folded to overlap to form a double-layer structure, and the double-layer structure is folded to extend close to the bottom of the U-shaped groove to form a limiting contact surface 301, and the bottom of the U-shaped groove of the conductive row is a single-layer structure. The bottom of the U-shaped groove of the conductive row 30 is provided with a broken weak part, and the two sides of the width direction of the connecting end are provided with a positioning groove 302. Two connecting holes (303, 304) are provided on the connecting end of the conductive row 30 along the length direction, and the aperture of the outermost connecting hole 304 is slightly larger than the aperture of the connecting hole 303, the connecting hole 303 is located between the first shell and the second shell, and the screw for fixing the conductive row passes through, and the connecting hole 304 is used for exciting the fuse during installation and connection. The double-layer structure of the connecting end of the conductive row 30 extends to one side of the bottom of the U-shaped groove after being folded, and limiting notches are respectively arranged on the two sides of the width direction of the double-layer structure, the third limiting ribs 404 of the second shell are respectively supported at the limiting notches of the conductive row 30 to form limiting supports. The second limiting rib 407 is arranged at the vertical feature position of the conductive row 30 at the inner wall of the cavity of the second shell 40, and the vertical feature at the inner wall of the cavity of the second shell 40 is limited by the second limiting rib 407.

[0036] The conductive row 30 is made of single-layer conductive material during manufacturing, and then the connecting end is folded to form a double-layer structure, which is used to improve the strength of the connecting end of the conductive row 30. Since the conductive row is made of single-layer material, compared with the material with relatively thick thickness, the part between the two ends is thinned to make the broken weak area of the conductive row, which saves more material.

[0037] After the first shell 20 and the second shell 40 are spliced, the conductive row 30 is arranged at the notches (205, 408) of the first shell 20 and the second shell 40, the first mounting bosses (204, 405) pass through the connecting holes 303 of the conductive row 30 and the corresponding connecting holes respectively, and then the first shell 20, the conductive row 30 and the second shell 40 are fixed and connected together by the screw 5. When the conductive row 30 is assembled, the first limiting ribs 406 on the second shell on both sides of the notches (205, 408) are clamped in the positioning grooves on both sides of the width direction of the conductive row 30 in an interference manner, so as to realize the positioning and sealing of both sides of the width direction of the conductive row 30. The conductive row 30 is interference-fitted in the notches of the first shell and the second shell, the second sealing ribs 203 and the second sealing ribs 401 collapse towards one end of the conductive row 30 under assembly pressure, so as to realize the sealing of the surface of the conductive row 30 towards the first shell and the second shell. The powdered material of the second sealing rib 401 collapses and fills in the U-shaped groove of the U-shaped second sealing rib 401, and a complete mechanical sealing structure is formed between the outer peripheral surface of the conductive row and the contact surface of the first shell and the second shell.

[0038] The first sealing rib 201 of the first shell 20 is nested at the first sealing groove 402 of the second shell 40, so that the third sealing rib 403 is pressed against the end face of the first sealing rib 201 to form a mechanical sealing structure of double-layer sub-groove structure. Meanwhile, the fourth sealing rib 410 on the second shell 40 is nested into the fourth sealing groove 206 of the first shell 20 to form a mechanical sealing structure of single-layer concave-convex structure, and the double mechanical sealing structures are arranged in a ring shape and staggered at the contact surface of the first shell and the second shell outside the width direction of the conductive row, so that the sealing performance is improved. The complete mechanical sealing structure between the contact surfaces of the first shell 20 and the second shell 40 is formed by the sealing cooperation of the mechanical sealing structure of the first sealing rib 201, the first sealing groove 402 and the third sealing rib 403, the sealing cooperation of the mechanical sealing structure of the fourth sealing rib 410 and the fourth sealing groove 206, and the sealing cooperation of the mechanical sealing structure of the sealing rib between the outer peripheral surface of the conductive row and the contact surface of the first shell and the second shell, so that the shell forms a sealed shell. The positioning boss 409 of the second shell 40 is nested in the positioning notch 207 of the first shell 20 to realize the assembly positioning between the first shell 20 and the second shell 40, and prevent mutual rotation. Then the screw 7 directly penetrates through the first shell and the second shell to fixedly connect the first shell and the second shell together.

[0039] The sealing rib and the sealing groove between the contact surfaces of the first shell and the second shell are matched with each other, and the sealing rib and the limiting rib of the outer peripheral surface of the conductive row are matched, the complete sealing of the shell is realized through the structure of the shell, the sealing performance of the shell is improved, the possibility of arc escaping outside the shell is eliminated, and the working safety is improved.

Claims

1. A high current energizing fuse, characterized in that, The application relates to a sealed shell, which comprises a shell, a conductive row, an electronic ignition device and a piston, the shell comprises a spliced first shell and a second shell, the conductive row is arranged between the contact surfaces of the first shell and the second shell, the electronic ignition device and the piston are arranged in the first shell respectively, the piston corresponds to the conductive row, mechanical sealing structures are arranged between the contact surfaces of the first shell and the second shell and between the contact surfaces of the first shell and the second shell and the conductive row respectively, so that the shell forms a sealed shell, the mechanical sealing structure comprises the following steps: first sealing ribs and first sealing grooves which are nested with each other are arranged on the contact surfaces of the first shell and the second shell which directly contact each other, so that the mechanical sealing structure is formed; second sealing ribs are arranged on the contact surfaces of the first shell and the second shell which contact the upper and lower surfaces of the conductive row, the second sealing ribs are in sealing contact with the upper and lower surfaces of the conductive row, and the mechanical sealing structure is formed.

2. The high current energized fuse of claim 1, wherein, A third sealing rib is arranged at the bottom of the first sealing groove, when the first sealing rib is nested in the first sealing groove, the first sealing rib abuts against the third sealing rib and crushes the third sealing rib.

3. The high current energizing fuse of claim 2, wherein, At least one fourth sealing rib and a fourth sealing groove are nested at the contact surfaces of the first shell and the second shell on the outer circumferential sides of the first sealing rib and the first sealing groove, so that the mechanical sealing structure is formed.

4. The high current energized fuse of claim 1, wherein, The second sealing rib on the second shell is in a U-shaped groove structure, when the first shell, the conductive row and the second shell are assembled, the material of the notch part of the U-shaped groove structure is crushed, and part of the crushed material is filled into the groove of the U-shaped groove structure.

5. The high current energized fuse of claim 1, wherein, Positioning notches are arranged on the opposite sides of the conductive row between the first shell and the second shell, first limiting ribs are arranged correspondingly, the first limiting ribs are arranged in the positioning notches in an interference fit mode, and the conductive row is limited.

6. The high current energized fuse of claim 1, wherein, First mounting bosses are arranged correspondingly at the contact surfaces of the first shell and the second shell through which the conductive row passes, threaded holes are arranged in the first mounting bosses, first through holes are arranged on the conductive row at positions corresponding to the first mounting bosses, the first mounting bosses on the first shell and the second shell pass through the first through holes of the conductive row, are butted in the first through holes, and screws pass through the threaded holes of the first mounting bosses to connect and fix the first shell, the conductive row and the second shell; the second sealing ribs are located on the two sides of the first mounting bosses and are connected with the outer sides of the first mounting bosses.

7. The high current energized fuse of claim 1, wherein, Second mounting bosses and first mounting counterbores for nesting the second mounting bosses are arranged at positions of the first sealing ribs and the first sealing grooves at the contact surfaces of the first shell and the second shell, threaded holes are arranged on the second mounting bosses and the first mounting counterbores, and screws pass through the second mounting bosses and the first mounting counterbores to connect the first shell and the second shell.

8. The high current energizing fuse of any one of claims 1 to 7, characterized in that The conductive row is in a U-shaped bending structure, the wiring end of the conductive row is in a folded double-layer structure, and the double-layer structure extends to both sides of the U-shaped groove bottom of the U-shaped bending structure of the conductive row.

9. The high current energized fuse of claim 1, wherein, The limiting notches are arranged on opposite sides of the bottom of the vertical feature of the conductive row; the vertical second limiting ribs are arranged at positions where the vertical feature of the conductive row passes through the cavity of the second shell, and the third limiting ribs are arranged on the inner wall of the cavity of the second shell corresponding to the positions of the limiting notches, so as to limit the position of the conductive row through the first limiting rib, the second limiting rib and the third limiting rib.

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