A temperature rise cut-off mechanism

Abstract

The application relates to the field of pyrotechnic switch accessories, in particular to a temperature rise cut-off mechanism. The temperature rise cut-off mechanism comprises a temperature rise cut-off assembly and a busbar body for cooperating with the temperature rise cut-off assembly to cut off, the temperature rise cut-off assembly comprises a temperature rise cut-off seat, a temperature rise cutter on the temperature rise cut-off seat and a temperature rise deformation piece connected with the temperature rise cutter, the temperature rise cutter is a conductor, and the temperature rise deformation piece pushes the temperature rise cutter to cut the busbar body when the temperature rises. When the circuit current is overloaded, the temperature in the switch rises, the temperature rise deformation piece deforms to make the temperature rise cutter move downward to cut off the thin connecting piece, at this moment, an overvoltage is generated, current overload can be judged without an external detection device.

Description

Technical Field

[0001] This application relates to the field of pyrotechnic switch accessories, and in particular to a temperature rise cut-off mechanism. Background Technology

[0002] The pyrotechnic switch uses a built-in miniature explosive device to quickly detonate when a system malfunction is detected, mechanically cutting off conductive components and instantly disconnecting the circuit. Its fast response time effectively prevents the risk of electric arcs or fires.

[0003] Existing pyrotechnic switches typically have an external detection device. When this device detects a circuit abnormality, it detonates the propellant within the pyrotechnic switch's detonator, generating an impact force to cut off the mains circuit. When space is limited enough to accommodate the external detection device, existing pyrotechnic switches are unusable. The purpose of this application is to provide a self-triggered temperature-rise cutoff mechanism for pyrotechnic switches. Utility Model Content

[0004] In order to achieve self-triggering of the pyrotechnic switch, this application provides a temperature rise cut-off mechanism.

[0005] The temperature rise cutting mechanism provided in this application adopts the following technical solution: A temperature rise cutting mechanism includes a temperature rise cutting assembly and a busbar body for cutting in conjunction with the temperature rise cutting assembly. The temperature rise cutting assembly includes a temperature rise cutting seat, a temperature rise cutter located on the temperature rise cutting seat, and a temperature rise deformation member connected to the temperature rise cutter. The temperature rise cutter is a conductor, and the temperature rise deformation member pushes the temperature rise cutter to cut the busbar body when the temperature rises.

[0006] By adopting the above technical solution, when the circuit current is overloaded, the temperature inside the switch rises, the temperature rise deformation component deforms, causing the temperature rise cutter to move downward and cut the thin connecting piece, at which point an overvoltage is generated, so that the current overload can be judged without the need for an external detection device.

[0007] Preferably, the temperature rise deformation component includes a temperature rise deformation component that is hard at room temperature and softens after temperature rise and a temperature rise spring, wherein the temperature rise spring is located on the side of the temperature rise deformation component facing away from the busbar body.

[0008] By adopting the above technical solution, the temperature rise spring can drive the temperature rise cutter by utilizing the characteristic of the temperature rise deformation component to soften when heated.

[0009] Preferably, the temperature rise deformation element is a bimetallic sheet composed of two layers of metals with different coefficients of thermal expansion, and the coefficient of thermal expansion of the metal layer closer to the busbar body is smaller than that of the metal layer farther away from the busbar body.

[0010] By adopting the above technical solution, when the temperature rise deformation part is heated, due to the difference in thermal expansion coefficients between the upper and lower layers, the temperature rise deformation part arches downward, and during the state change process, it pushes the temperature rise pusher downward.

[0011] Preferably, the temperature rise cutting seat includes two symmetrically arranged cutting seat components. The upper end faces of the two cutting seat components are formed with through holes that pass through the cutting seat components from top to bottom. The through holes are located near the edge of the adjacent cutting seat component. The temperature rise cutter is located between the two cutting seat components.

[0012] Preferably, the upper end face of the cutting seat component is formed with a temperature rise groove that extends laterally through the cutting seat component in the left-right direction, and both ends of the temperature rise deformation component are located in the temperature rise groove.

[0013] Preferably, the upper side of the temperature rise cutter has two cutter slots, with a gap between the two cutter slots and the two cutter slots are symmetrically arranged along the center of the temperature rise cutter. The middle and front and rear sides of the temperature rise deformable part have deformable part slots that cooperate with the temperature rise cutter.

[0014] By adopting the above technical solution, a cutter slot and a deformable part slot are set so that the temperature rise cutter and the temperature rise deformable part can be engaged and locked together, and the temperature rise cutter moves together with the temperature rise deformable part.

[0015] Preferably, the upper surface of the temperature rise deformable part near the left and right ends, the upper surface of the cutting seat part near the front and rear ends, and the bottom of the temperature rise slot are all formed with temperature rise mounting holes. Temperature rise mounting parts are provided in the temperature rise mounting holes to connect the cutting seat part and the temperature rise deformable part.

[0016] By adopting the above technical solution, the temperature rise mounting component is used in conjunction with the fixed cutting seat component and the two ends of the temperature rise deformation component.

[0017] Preferably, the busbar body is formed with a pre-cut end that runs through the entire busbar body along the width direction. A thin connecting piece is provided at the bottom of the busbar body below the pre-cut end to connect and conduct the left and right sides of the busbar body. The temperature rise cutter is located in the pre-cut hole. Gaps are left between the two side walls of the temperature rise cutter, the two side walls of the pre-cut hole, and the thin connecting piece.

[0018] By adopting the above technical solution Preferably, the thin connecting piece is elliptical, and the length of the major axis of the thin connecting piece is less than the width of the busbar body.

[0019] By adopting the above technical solution, a pre-splitting opening is set on the busbar body and the two sides of the busbar body are connected by a thin connecting piece. This allows the temperature rise deformation component to cut the thin connecting piece by pushing the temperature rise cutter with a small amplitude movement. The gaps between the two side walls of the temperature rise cutter, the two side walls of the pre-splitting hole, and the thin connecting piece ensure that the temperature rise cutter will not be connected to the busbar in the initial state. Overvoltage will only be generated when the thin connecting piece is cut.

[0020] Preferably, the thin connecting piece has multiple pre-splitting holes formed on the position opposite to the pre-splitting opening, arranged along the length direction of the pre-splitting opening.

[0021] By adopting the above technical solution, the thin connecting piece is made easier to cut.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. When the circuit current is overloaded, the temperature inside the switch rises, and the temperature rise deformation component deforms, causing the temperature rise cutter to move downward and cut the thin connecting piece. At this time, an overvoltage is generated, so that the overload can be judged without the need for an external detection device.

[0023] Attached Figure Description Figure 1 This is a schematic diagram of the pyrotechnic switch in Embodiment 1; Figure 2 This is an explosion diagram of the pyrotechnic switch in Example 1; Figure 3 This is a schematic diagram of the structure of a single shell in Embodiment 1; Figure 4 This is a structural schematic diagram of the shell layer in Embodiment 1 from another perspective; Figure 5 This is a schematic diagram of the two-shell structure in Embodiment 1; Figure 6 This is a schematic diagram of the three-layer shell structure in Embodiment 1; Figure 7 This is a cross-sectional schematic diagram of the three-layer shell in Embodiment 1; Figure 8 This is a schematic diagram of the four-layer shell structure in Embodiment 1; Figure 9 This is a schematic diagram of the five-layer shell structure in Example 1; Figure 10 This is a structural schematic diagram of the five-layer shell from another perspective in Embodiment 1; Figure 11 This is an explosion diagram of the busbar assembly, temperature rise cutoff assembly, and detonation cutoff assembly in Embodiment 1; Figure 12 This is a schematic diagram of the temperature rise cutoff component in Embodiment 1; Figure 13 This is an exploded schematic diagram of the temperature rise cutoff component in Embodiment 1; Figure 14 This is a schematic diagram of the structure of an initiation and cutting-off assembly according to an embodiment; Figure 15 This is a schematic diagram of the structure of the temperature rise deformation component in Example 2.

[0024] Explanation of reference numerals in the attached drawings: 1. Shell; 2. Busbar body; 3. Temperature rise cutoff assembly; 4. Detonation cutoff assembly; 5. First layer shell; 6. Second layer shell; 7. Third layer shell; 8. Fourth layer shell; 9. Fifth layer shell; 10. Temperature rise cutoff lower clearance groove; 11. Detonation cutoff lower clearance groove; 12. First layer abutment post; 13. First layer guide post; 14. First layer connecting groove; 15. First layer through hole; 16. First layer countersunk hole; 17. Second layer connecting protrusion; 19. Second layer through hole; 20. Temperature rise cutoff lower clearance hole; 21. Detonation cutoff 21. Lower clearance hole; 22. Second-layer guide groove; 23. Second-layer abutment post; 24. Positioning connection post; 26. Third-layer through hole; 27. Temperature rise cut-off installation groove; 28. Detonation cut-off installation groove; 29. ​​Temperature rise cut-off through hole; 30. Temperature rise cut-off lower limit groove; 31. Third-layer mounting hole; 32. Third-layer guide groove; 33. Positioning cylinder; 34. Third-layer guide post; 35. Busbar receiving cavity; 36. Support extension plate; 37. Fourth-layer connecting protrusion; 38. Fourth-layer connecting groove; 39. Fourth-layer through hole; 40. Temperature rise cut-off receiving groove ; 41. Detonation cut-off receiving groove; 42. Temperature rise cut-off upper limit groove; 43. Four-layer mounting hole; 45. Four-layer guide groove; 46. Detonation cut-off clearance groove; 48. Five-layer connecting protrusion; 49. Five-layer through hole; 50. Five-layer countersunk hole; 51. Five-layer receiving cavity; 52. First electrical connection part; 53. Second electrical connection part; 54. Temperature rise cutting part; 55. Detonation cutting part; 56. Electrical connection hole; 57. Pre-cutting edge; 58. Busbar mounting hole; 59. Thin connecting piece; 60. Pre-cutting hole; 61. Rectangular groove 62. Detonation cutting positioning groove; 63. Deformation groove; 64. Severing groove; 65. Temperature rise cutting seat; 66. Temperature rise cutter; 67. Temperature rise deformed part; 68. Cutting seat component; 69. Through hole; 70. Temperature rise retaining groove; 71. Temperature rise deformed part; 72. Cutter retaining groove; 73. Deformed part retaining groove; 74. Temperature rise mounting hole; 75. Detonation cutting seat; 76. Temperature rise spring; 77. Cutting seat top plate; 78. Cutting seat extension plate; 79. Extension plate guide groove; 80. Detonation cutter; 81. Top plate groove. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1-15 This application will be described in further detail.

[0026] This application discloses a pyrotechnic switch. The terms "up", "down", "left", and "right" used in the embodiments are schematic representations of relative directions and are not limitations on the positional relationship.

[0027] Example 1: like Figure 1 and Figure 2 As shown, the pyrotechnic switch includes a housing 1, a busbar body 2, a temperature rise cutoff assembly 3 for cutting off the busbar body 2, and two detonation cutoff assemblies 4. The housing 1 comprises, from bottom to top, a first shell 5, a second shell 6, a third shell 7, a fourth shell 8, and a fifth shell 9. The busbar body 2 is located within the third shell 7, and the temperature rise cutoff assembly 3 and the detonation cutoff assembly 4 are located within the fourth shell 8. The designations of first, second, third, fourth, and fifth shells are merely for distinguishing purposes and do not imply that the housing 1 must have a five-layer structure.

[0028] like Figure 3 and Figure 4 As shown, the upper surface of the shell 5 has one temperature rise cutting lower avoidance groove 10 and two detonation cutting lower avoidance grooves 11 formed sequentially from left to right. The temperature rise cutting lower avoidance groove 10 is T-shaped, and the detonation cutting lower avoidance groove 11 is circular. The bottom surface of the detonation cutting lower avoidance groove 11 has a layer of abutment post 12 formed, and the upper surface of the abutment post 12 is higher than the upper surface of the shell 5. Inside the detonation cutting lower avoidance groove 11, at the positions on both sides of the abutment post 12, a layer of guide post 13 is formed, and the height of the guide post 13 is higher than the height of the abutment post 12. The upper surface of the shell 5 has a ring-shaped layer of connecting groove 14. The bottom of the connecting groove 14 has eight layer of through holes 15 that penetrate the shell 5 downwards, distributed around the shell 5. The bottom surface of the shell 5 has circular countersunk holes 16 corresponding to the eight layer of through holes 15. Each detonation cut-off clearance groove 11 located on both sides of the first-layer abutment post 12 is filled with arc-extinguishing filler.

[0029] like Figure 5 As shown, both the upper and lower end faces of the double-layer shell 6 are formed with a ring of double-layer connecting protrusions 17. The double-layer shell 6 has eight double-layer through holes 19, each corresponding to a single-layer through hole 15. From left to right, the upper end face of the double-layer shell 6 has one temperature rise cut-off lower avoidance hole 20 and two detonation cut-off lower avoidance holes 21 penetrating the double-layer shell 6. The temperature rise cut-off lower avoidance hole 20 is directly opposite the temperature rise cut-off lower avoidance groove 10, and the detonation cut-off lower avoidance hole 21 is directly opposite the detonation cut-off lower avoidance groove 11. The temperature rise cut-off lower avoidance hole 20 is rectangular. A double-layer guide groove 22 is formed on each side of the detonation cut-off lower avoidance hole 21. A single-layer guide post 13 cooperates with the double-layer guide groove 22 to provide guidance and positioning. A double-layer abutment post 23 is formed on each side of the detonation cut-off lower avoidance hole 21. The second-layer abutment post 23 is elongated, and its length is along the front-to-back direction. Eight positioning connecting posts 24 are formed around the two detonation cut-off lower avoidance holes 21 on the lower end face of the second-layer shell 6. These eight positioning connecting posts 24 are positioned by abutting against the inner wall of the detonation cut-off lower avoidance groove 11.

[0030] like Figure 6 and Figure 7 As shown, the upper and lower end faces of the three-layer shell 7 are both formed with a ring-shaped three-layer connecting groove. The three-layer shell 7 has eight three-layer through holes 26 corresponding one-to-one with the two-layer through holes 19. From left to right, the upper end face of the three-layer shell 7 has one temperature rise cut-off mounting groove 27 and two detonation cut-off mounting grooves 28. The temperature rise cut-off mounting groove 27 is rectangular, and its bottom surface has a temperature rise cut-off perforation 29. The temperature rise cut-off perforation 29 can be elliptical, elongated, or other shapes. The front and rear sides of the temperature rise cut-off mounting groove 27 both have vertically oriented temperature rise cut-off lower limiting grooves 30. Inside the temperature rise cut-off mounting groove 27, located on the left and right sides of the temperature rise cut-off perforation 29, are three three-layer mounting holes 31 distributed along the front and rear directions. The detonation cut-off mounting groove 28 is circular, and its inner wall near the lower end has a section of three-layer guide groove 32 on both the front and rear sides. A ring-shaped positioning cylinder 33 extends upward around the detonation cut-off mounting groove 28. Three layers of guide pillars 34 are formed on both the front and rear sides of the positioning cylinder 33, running vertically. The upper surfaces of the guide pillars 34 are flush with the upper surfaces of the positioning cylinder 33. A busbar receiving cavity 35, penetrating the three-layer shell 7, is formed on the side of the shell from left to right. The bottom surface of the busbar receiving cavity 35 is flush with the bottom surface of the temperature rise cut-off mounting groove 27. Supporting extension plates 36 are formed on the upper and lower sides of the busbar receiving cavity 35, penetrating the detonation cut-off mounting groove 28.

[0031] like Figure 8 As shown, the lower end face of the four-layer shell 8 is formed with a ring of four-layer connecting protrusions 37, and the upper end face of the four-layer shell 8 is formed with a ring of four-layer connecting grooves 38. The four-layer shell 8 has eight four-layer through holes 39 corresponding one-to-one with the three-layer through holes 26. From left to right, the lower end face of the four-layer shell 8 has a temperature rise cutting receiving groove 40 and two detonation cutting receiving grooves 41. The temperature rise cutting receiving groove 40 is rectangular, and the detonation cutting receiving grooves 41 are circular. The inner diameter of the detonation cutting receiving groove 41 is equal to the outer diameter of the positioning cylinder 33. Temperature rise cutting upper limit grooves 42 are formed on both the front and rear sides of the temperature rise cutting receiving groove 40 in the vertical direction. The bottom surface of the temperature rise cutting receiving groove 40 has an array of regular hexagonal four-layer mounting holes 43, two of which have vertically penetrating temperature rise wire through-holes in the bottom surface of the four-layer shell 8. The inner walls of both the front and rear sides of the detonation cut-off receiving groove 41 are formed with four layers of guide grooves 45. The upper bottom surface of the detonation cut-off receiving groove 41 is formed with a detonation cut-off clearance groove 46, the diameter of which is smaller than that of the detonation cut-off receiving groove 41. The diameter of the detonation cut-off clearance groove 46 is equal to the inner diameter of the positioning cylinder 33. The bottom surface of the detonation cut-off clearance groove 46 is formed with a detonation wire through-hole that penetrates the four layers of shell 8 in a vertical direction.

[0032] like Figure 9 and Figure 10 As shown, the lower end face of the five-layer shell 9 is formed with a ring of five-layer connecting protrusions 48. The five-layer shell 9 has eight five-layer through holes 49, each corresponding to a four-layer through hole 39. The upper end face of the five-layer shell 9 has hexagonal five-layer countersunk holes 50 corresponding to each five-layer through hole 49. The lower end face of the five-layer shell 9 has a five-layer receiving cavity 51, within which a control chip is disposed. In other embodiments, a receiving cavity can also be provided within the four-layer shell 8 to house the control chip. During assembly, the shells 1 are connected and assembled together using fasteners.

[0033] like Figure 11 As shown, the length of the busbar body 2 is greater than the length of the shell 1, and the width of the busbar body 2 is equal to the width of the busbar receiving cavity 35. The busbar body 2 includes a first electrical connection portion 52 and a second electrical connection portion 53 located at both ends, and a temperature rise cutting portion 54 and two detonation cutting portions 55 arranged sequentially between the first electrical connection portion 52 and the second electrical connection portion 53. Both the first electrical connection portion 52 and the second electrical connection portion 53 are formed with electrical connection holes 56. The temperature rise cutting portion 54 is formed with a pre-cutting slit 57 that runs through the entire busbar body 2 along the width direction. Three busbar mounting holes 58 are formed on each side of the pre-cutting slit 57. The three busbar mounting holes 58 on the same side are arranged in a straight line and all the busbar mounting holes 58 are equidistant from the pre-cutting slit 57. At the bottom of the busbar body 2, below the pre-splitting opening 57, a thin connecting piece 59 is provided to connect and conduct the left and right sides of the busbar body 2. The thin connecting piece 59 is elliptical, and the length of its major axis is less than the width of the busbar body 2. Multiple pre-splitting holes 60 are formed on the thin connecting piece 59 directly opposite the pre-splitting opening 57, arranged along the length of the pre-splitting opening 57, with equal spacing between adjacent pre-splitting holes 60. Rectangular grooves 61 are formed on both the front and rear sides of the two detonation cutting sections 55. Two detonation cutting positioning grooves 62, extending along the width of the busbar body 2, are formed on the upper side of each of the two detonation cutting sections 55. The detonation cutting positioning grooves 62 are rectangular, and both sides of the detonation cutting positioning grooves 62 are chamfered. The lower sides of both detonation cutting sections 55 are formed with two deformation grooves 63 and a splitting groove 64 located between the two deformation grooves 63. The longitudinal cross-section of the deformation groove 63 is rectangular, and the longitudinal cross-section of the splitting groove 64 is a triangle with a larger bottom and a smaller top. The tip of the splitting groove 64 is directly opposite the middle of the detonation cutting positioning groove 62. The distance between the side walls of the two deformation grooves 63 facing the splitting groove 64 is slightly smaller than the distance between the two side walls of the detonation cutting positioning groove 62.

[0034] like Figure 12 and Figure 13As shown, the temperature rise cutting assembly 3 includes a temperature rise cutting seat 65, a temperature rise cutter 66 located on the temperature rise cutting seat 65, and a temperature rise deformation member 67 connected to the temperature rise cutter 66. The temperature rise cutting seat 65 includes two symmetrically arranged cutting seat components 68. A through hole 69 is formed on the side of the upper end face of the two cutting seat components 68 that is close to each other, and the through hole 69 is close to the edge of the adjacent cutting seat component 68. A temperature rise groove 70 is formed on the upper end face of the cutting seat component 68 that is transversely through the cutting seat component 68 in the left-right direction. The temperature rise cutting seat 65 is located in the temperature rise cutting mounting groove 27, and there is a gap between the two cutting seat components 68. A vertically arranged temperature rise cutter 66 is installed between the two cutting seat components 68. The lower end of the temperature rise cutter 66 is a blade, and the two sides of the temperature rise cutter 66 are in contact with the two cutting seat components 68. The temperature rise cutter 66 is located inside the pre-splitting hole 60, directly opposite the temperature rise cutting through hole 29. A 1mm gap is left between the two side walls of the temperature rise cutter 66 and the two side walls of the pre-splitting hole 60, and a gap is also left between the temperature rise cutter 66 and the thin connecting piece 59. The front and rear ends of the temperature rise cutter 66 are located within the upper limit groove 42 and the lower limit groove 30 of the temperature rise cutting. The temperature rise cutter 66 is a conductor, and the temperature rise wire passes through the temperature rise wire through hole and connects to the temperature rise cutter 66 and the control chip. Two cutter slots 72 are formed on the upper side of the temperature rise cutter 66. The two cutter slots 72 are spaced apart and are symmetrically arranged around the center of the temperature rise cutter 66. The temperature rise deformation component 67 includes a temperature rise deformation component 71 that is hard at room temperature and softens after temperature rise, and a temperature rise spring 76 located above the temperature rise deformation component 71. The temperature rise deformation component 71 spans across the two cutting seat components 68, and both ends of the temperature rise deformation component 71 are located in the two temperature rise slots 70. The middle and front and rear sides of the temperature rise deformation component 71 are formed with deformation component slots 73 that cooperate with the temperature rise cutter 66. Temperature rise mounting holes 74 are formed on the upper surface of the temperature rise deformation component 71 near the left and right ends, on the upper surface of the cutting seat component 68 near the front and rear ends, and at the bottom of the temperature rise slots 70. Six temperature rise mounting components pass through the six temperature rise mounting holes 74 respectively, and the upper and lower ends of the temperature rise mounting components pass through the busbar mounting holes 58 and are inserted into the three-layer mounting holes 31 and the four-layer mounting holes 43.

[0035] like Figure 14As shown, the detonation cutting assembly 4 includes a detonation cutting seat 75 located within the detonation cutting mounting groove 28 and a detonator located above the detonation cutting seat 75. The detonator can be a gunpowder box. The detonation cutting seat 75 includes a cylindrical cutting seat top plate 77 and a cutting seat extension plate 78 extending downwards from the lower surface of the cutting seat top plate 77 near both the front and rear ends. The outer contour of the cutting seat extension plate 78 is flush with the outer contour of the cutting seat top plate 77, and each of the lower ends of the cutting seat extension plate 78 near the middle is formed with a vertical extension plate guide groove 79. The width of the extension plate guide groove 79 is equal to the width of the first layer of guide post 13. A vertical detonation cutter 80 is provided between the two cutting seat extension plates 78. The detonation cutter 80 is an insulator, and the two detonation cutters 80 are located on both sides of the extension plate guide groove 79, with the lower end of the detonation cutter 80 being a blade. The outer diameter of the top plate 77 of the cutting seat is equal to the inner diameter of the detonation cutting clearance groove 46, and the upper end surface of the top plate 77 of the cutting seat is formed with a top plate groove 81 for accommodating the detonator. The detonating wire passes through the detonating wire through hole and is connected to the control chip and the detonator.

[0036] Specific usage process: When the circuit current is overloaded, the temperature inside the switch rises, and the temperature rise deformation element 67 deforms, causing the temperature rise cutter 66 to move downward and cut the thin connecting piece 59, thus generating an overvoltage. When the control chip receives the overvoltage signal, it controls the detonator to detonate, causing the detonating cutter 80 to move downward and cut the busbar.

[0037] Example 2: like Figure 15 As shown, the only difference between this embodiment and Embodiment 1 is that the temperature rise deformation component 67 is composed of two layers of metals with different coefficients of thermal expansion, with the coefficient of thermal expansion of the lower metal being smaller than that of the upper metal.

[0038] The temperature rise deformable element 67 spans across the two cutting seat components 68, with both ends of the temperature rise deformable element 67 located within the two temperature rise retaining slots 70. A deformable element retaining slot for mates with the temperature rise cutter 66 is formed in the middle of the temperature rise deformable element 67, and the temperature rise deformable element 67 arches slightly upwards from both sides towards the middle. Temperature rise mounting holes 74 are formed on the upper surface of the temperature rise deformable element 67 near both ends, and it is fixed to the cutting seat component 68 by temperature rise mounting parts.

[0039] When the temperature rise deformation component 67 heats up, due to the difference in thermal expansion coefficients between the upper and lower layers, the upper metal layer with a larger thermal expansion coefficient generates internal stress at the beginning of the heating process. When the generated stress exceeds the critical point, the temperature rise deformation component 67 changes from an upward arched state to a downward arched state. During the state change, it pushes the temperature rise pusher to move downward, causing the temperature rise cutter 66 to cut the thin connecting piece 59.

[0040] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A temperature rise cutting mechanism, comprising a temperature rise cutting assembly (3) and a busbar body (2) for cutting in conjunction with the temperature rise cutting assembly (3), characterized in that, The temperature rise cutting assembly (3) includes a temperature rise cutting seat (65), a temperature rise cutter (66) located on the temperature rise cutting seat (65), and a temperature rise deformation member (67) connected to the temperature rise cutter (66). The temperature rise cutter (66) is a conductor, and the temperature rise deformation member (67) pushes the temperature rise cutter (66) to cut the busbar body (2) when the temperature rises.

2. The temperature rise cutting-off mechanism according to claim 1, characterized in that, The temperature rise deformation component (67) includes a temperature rise deformation component that is hard at room temperature and softens after temperature rise and a temperature rise spring. The temperature rise spring is located on the side of the temperature rise deformation component facing away from the busbar body (2).

3. The temperature rise cutting mechanism according to claim 2, characterized in that, The temperature rise deformation element (67) is a bimetallic sheet composed of two layers of metals with different coefficients of thermal expansion, and the coefficient of thermal expansion of the metal layer on the side closer to the busbar body (2) is smaller than that of the metal layer on the side farther from the busbar body (2).

4. The temperature rise cutting mechanism according to claim 3, characterized in that, The temperature rise cutting seat (65) includes two symmetrically arranged cutting seat components (68). The upper end faces of the two cutting seat components (68) are formed with through holes (69) that pass through the cutting seat components (68) from top to bottom. The through holes (69) are located near the edge of the adjacent cutting seat component (68). The temperature rise cutter (66) is located between the two cutting seat components (68).

5. The temperature rise cutting mechanism according to claim 4, characterized in that, The upper end face of the cutting seat component (68) is formed with a temperature rise groove (70) that extends laterally through the cutting seat component (68) in the left-right direction, and both ends of the temperature rise deformation component (67) are located in the temperature rise groove (70).

6. The temperature rise cutting mechanism according to claim 5, characterized in that, The upper side of the temperature rise cutter (66) has two cutter slots (72) formed, with a gap between the two cutter slots (72) and the two cutter slots (72) are symmetrically arranged along the center of the temperature rise cutter (66). The middle part and the front and rear sides of the temperature rise deformed part have deformed part slots (73) formed to cooperate with the temperature rise cutter (66).

7. The temperature rise cutting-off mechanism according to claim 6, characterized in that, Temperature rise mounting holes (74) are formed on the upper surface of the temperature rise deformable part near the left and right ends, on the upper surface of the cutting seat part (68) near the front and rear ends, and at the bottom of the temperature rise slot (70). Temperature rise mounting parts are provided in the temperature rise mounting holes (74) to connect the cutting seat part (68) and the temperature rise deformable part.

8. The temperature rise cutting-off mechanism according to claim 1, characterized in that, The busbar body (2) is formed with a pre-cut section (57) that runs through the entire busbar body (2) along the width direction. A thin connecting piece (59) connecting the left and right sides of the busbar body (2) is provided at the bottom of the busbar body (2) below the pre-cut section (57). The temperature rise cutter (66) is located inside the pre-cut hole (60). There are gaps between the two side walls of the temperature rise cutter (66), the two side walls of the pre-cut hole (60), and the thin connecting piece (59).

9. The temperature rise cutting mechanism according to claim 8, characterized in that, The thin connecting piece (59) is elliptical, and the length of the major axis of the thin connecting piece (59) is less than the width of the busbar body (2).

10. The temperature rise cutting mechanism according to claim 9, characterized in that, The thin connecting piece (59) has a plurality of pre-splitting holes (60) arranged along the length of the pre-splitting opening (57) at the position opposite to the pre-splitting opening (57).

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