Pyrotechnic switch housing

Abstract

The application relates to the field of pyrotechnic switch accessories, in particular to a pyrotechnic switch shell. The pyrotechnic switch shell comprises a three-layer shell and a four-layer shell, the upper end face of the three-layer shell is formed with a temperature rise cut-off mounting groove and at least two detonation cut-off mounting grooves, a ring-shaped positioning cylinder is upwardly extended and formed around the detonation cut-off mounting groove, and three-layer guide columns in the vertical direction are formed on the front and back sides of the positioning cylinder; the lower end face of the four-layer shell is formed with a temperature rise cut-off accommodating groove and at least two detonation cut-off accommodating grooves, the temperature rise cut-off accommodating groove is opposite to the temperature rise cut-off mounting groove, the detonation cut-off accommodating groove is opposite to the detonation cut-off mounting groove, the inner diameter of the detonation cut-off accommodating groove is equal to the outer diameter of the positioning cylinder, and four-layer guide grooves matched with the three-layer guide columns are formed on the front and back sides of the temperature rise cut-off accommodating groove. The temperature rise cut-off mounting groove and the temperature rise cut-off accommodating groove are matched with a temperature rise cut-off assembly, and the detonation cut-off mounting groove and the detonation cut-off accommodating groove are matched with a detonation cut-off assembly.

Description

Technical Field

[0001] This application relates to the field of pyrotechnic switch accessories, and more particularly to a pyrotechnic switch housing. 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 that cuts off the mains circuit. When space is limited enough to accommodate the external detection device, existing pyrotechnic switches become unusable. The purpose of this application is to provide a housing accessory suitable for a self-detecting pyrotechnic switch. Utility Model Content

[0004] This application provides a pyrotechnic switch housing that can be adapted to install self-testing accessories.

[0005] This application provides a pyrotechnic switch housing, which adopts the following technical solution: A pyrotechnic switch housing includes a three-layer housing and a four-layer housing. The upper surface of the three-layer shell is formed with a temperature rise cut-off installation groove and at least two detonation cut-off installation grooves. A ring-shaped positioning cylinder extends upward around the detonation cut-off installation groove. Three layers of guide columns are formed on the front and rear sides of the positioning cylinder in the vertical direction. The lower end face of the four-layer shell is formed with a temperature rise cut-off receiving groove and at least two detonation cut-off receiving grooves. The temperature rise cut-off receiving groove is directly opposite the temperature rise cut-off installation groove, and the detonation cut-off receiving groove is directly opposite the detonation cut-off installation groove. The inner diameter of the detonation cut-off receiving groove is equal to the outer diameter of the positioning cylinder. The front and rear sides of the temperature rise cut-off receiving groove are formed with four-layer guide grooves that cooperate with the three-layer guide posts.

[0006] By adopting the above technical solution, a temperature rise cutoff installation groove and a temperature rise cutoff receiving groove are set to accommodate the installation of the temperature rise cutoff assembly, and an ignition cutoff installation groove and an ignition cutoff receiving groove are set to accommodate the installation of the ignition cutoff assembly. The three-layer shell and the four-layer shell are positioned by the cooperation of the three-layer guide pillars and the four-layer guide groove, so that the upper and lower design spaces are aligned and will not be offset.

[0007] Preferably, the temperature rise cutting installation groove is rectangular, and the bottom surface of the temperature rise cutting installation groove is formed with a temperature rise cutting perforation.

[0008] Preferably, the front and rear sides of the temperature rise cutting installation groove are formed with a lower temperature rise cutting limit groove in the vertical direction, and the front and rear sides of the temperature rise cutting receiving groove are formed with an upper temperature rise cutting limit groove in the vertical direction, with the position of the upper temperature rise cutting limit groove being directly opposite the position of the lower temperature rise cutting limit groove.

[0009] By adopting the above technical solution, the position of the temperature rise cutter is limited by the lower limit groove and the upper limit groove of the temperature rise cutter, so that the temperature rise cutter can be directly facing the position to be cut without deviation.

[0010] Preferably, the side of the three-layer shell is formed with a busbar receiving cavity that penetrates the three-layer shell from left to right. The bottom surface of the busbar receiving cavity is flush with the bottom surface of the temperature rise cutting installation groove. Supporting extension plates are formed on the upper and lower sides of the busbar receiving cavity that penetrate the detonation cutting installation groove.

[0011] By adopting the above technical solution, and by setting up support extension plates to support both sides of the cut-off point of the busbar body, the busbar body is made easier to cut.

[0012] Preferably, the upper end face of the shell layer is formed with a temperature rise cut-off lower avoidance groove and at least two detonation cut-off lower avoidance grooves. The bottom surface of the detonation cut-off lower avoidance groove is formed with a layer of abutment posts. The upper surface height of the abutment posts is higher than the upper surface height of the shell layer. A layer of guide posts is formed in the detonation cut-off lower avoidance groove at the front and rear sides of the abutment posts. The height of the guide posts is higher than the height of the abutment posts.

[0013] Preferably, the upper end face of the second shell is formed with a temperature rise cut-off lower avoidance hole penetrating the second shell and at least two detonation cut-off lower avoidance holes, and a second-layer guide groove is formed on each side of the second shell at the front and rear sides of the detonation cut-off lower avoidance hole, which cooperates with the first-layer guide post.

[0014] Preferably, the lower end face of the second shell is formed with eight positioning connecting posts around the two detonation cut-off avoidance holes.

[0015] Preferably, the lower end face of the five-layer shell is formed with five receiving cavities.

[0016] Preferably, the upper end face of the first shell is formed with an annular first-layer connecting groove, the upper and lower end faces of the second shell are both formed with an annular second-layer connecting protrusion, the upper and lower end faces of the third shell are both formed with an annular third-layer connecting groove, the lower end face of the fourth shell is formed with an annular fourth-layer connecting protrusion, the upper end face of the fourth shell is formed with an annular fourth-layer connecting groove, and the lower end face of the fifth shell is formed with an annular fifth-layer connecting protrusion.

[0017] By adopting the above technical solutions, the first, second, third, fourth, and fifth shells can be positioned.

[0018] Preferably, the bottom of the first-layer connecting groove is formed with eight through holes that penetrate downward through the first-layer shell in a circle. The bottom surface of the first-layer shell is formed with circular countersunk holes corresponding to the eight through holes. The second-layer shell is formed with eight through holes corresponding to the first-layer through holes. The third-layer shell is formed with eight through holes corresponding to the second-layer through holes. The fourth-layer shell is formed with eight through holes corresponding to the third-layer through holes. The fifth-layer shell is formed with eight through holes corresponding to the fourth-layer through holes. The upper surface of the fifth-layer shell is formed with a regular hexagonal countersunk hole corresponding to each of the five-layer through holes.

[0019] In summary, this application includes at least one of the following beneficial technical effects: 1. Temperature rise cutoff mounting slots and temperature rise cutoff receiving slots are provided to accommodate the installation of temperature rise cutoff components. Detonation cutoff mounting slots and detonation cutoff receiving slots are provided to accommodate the installation of detonation cutoff components. The three-layer shell and the four-layer shell are positioned by the cooperation of three-layer guide pillars and four-layer guide grooves, ensuring that the upper and lower design spaces are aligned and do not shift. Attached Figure Description

[0020] 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.

[0021] 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

[0022] The following is in conjunction with the appendix Figure 1-15 This application will be described in further detail.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] like Figure 5As 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.

[0027] 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.

[0028] like Figure 8As 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.

[0029] 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.

[0030] like Figure 11As 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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 pyrotechnic switch housing, comprising a three-layer housing (7) and a four-layer housing (8), characterized in that, The upper end face of the three-layer shell (7) is formed with a temperature rise cut-off installation groove (27) and at least two detonation cut-off installation grooves (28). A ring-shaped positioning cylinder (33) extends upward around the detonation cut-off installation groove (28). Three-layer guide columns (34) are formed on both the front and rear sides of the positioning cylinder (33) along the vertical direction. The lower end face of the four-layer shell (8) is formed with a temperature rise cut-off receiving groove (40) and at least two detonation cut-off receiving grooves (41). The temperature rise cut-off receiving groove (40) is directly opposite the temperature rise cut-off mounting groove (27), and the detonation cut-off receiving groove (41) is directly opposite the detonation cut-off mounting groove (28). The inner diameter of the detonation cut-off receiving groove (41) is equal to the outer diameter of the positioning cylinder (33). The front and rear sides of the temperature rise cut-off receiving groove (40) are formed with four-layer guide grooves (45) that cooperate with the three-layer guide posts (34).

2. The pyrotechnic switch housing according to claim 1, characterized in that, The temperature rise cutting installation groove (27) is rectangular, and the bottom surface of the temperature rise cutting installation groove (27) is formed with a temperature rise cutting perforation (29).

3. The pyrotechnic switch housing according to claim 2, characterized in that, The front and rear sides of the temperature rise cutting installation groove (27) are formed with a vertical temperature rise cutting lower limit groove (30), and the front and rear sides of the temperature rise cutting receiving groove (40) are formed with a vertical temperature rise cutting upper limit groove (42). The position of the temperature rise cutting upper limit groove (42) is directly opposite to the position of the temperature rise cutting lower limit groove (30).

4. The pyrotechnic switch housing according to claim 3, characterized in that, The side of the three-layer shell (7) is formed from left to right with a busbar receiving cavity (35) that penetrates the three-layer shell (7). The bottom surface of the busbar receiving cavity (35) is flush with the bottom surface of the temperature rise cut-off installation groove (27). The busbar receiving cavity (35) is formed with supporting extension plates (36) at the upper and lower sides of the detonation cut-off installation groove (28).

5. The pyrotechnic switch housing according to claim 4, characterized in that, It also includes a first shell (5), a second shell (6) and a fifth shell (9); the upper end face of the first shell (5) is formed with a temperature rise cut-off lower avoidance groove (10) and at least two detonation cut-off lower avoidance grooves (11), the bottom surface of the detonation cut-off lower avoidance groove (11) is formed with a layer of abutment post (12), the upper surface height of the abutment post (12) is higher than the upper surface height of the first shell (5), and a layer of guide post (13) is formed in the detonation cut-off lower avoidance groove (11) at the front and rear sides of the abutment post (12), the height of the guide post (13) is higher than the height of the abutment post (12).

6. The pyrotechnic switch housing according to claim 5, characterized in that, The upper end face of the second shell (6) is formed with a temperature rise cut-off lower avoidance hole (20) penetrating the second shell (6) and at least two detonation cut-off lower avoidance holes (21). The second shell (6) is formed with a second-layer guide groove (22) on each side of the detonation cut-off lower avoidance hole (21) in front of and behind it. The second layer guide groove (22) is formed to cooperate with the first-layer guide post (13).

7. The pyrotechnic switch housing according to claim 6, characterized in that, The lower end face of the second shell (6) is formed with eight positioning connecting posts (24) around the two detonation cut-off lower avoidance holes (21).

8. The pyrotechnic switch housing according to claim 7, characterized in that, The lower end face of the five-layer shell (9) is formed with five-layer receiving cavities (51).

9. The pyrotechnic switch housing according to claim 8, characterized in that, The upper end face of the first shell (5) is formed with a ring-shaped first-layer connecting groove (14), the upper and lower end faces of the second shell (6) are both formed with a ring-shaped second-layer connecting protrusion (17), the upper and lower end faces of the third shell (7) are both formed with a ring-shaped third-layer connecting groove, the lower end face of the fourth shell (8) is formed with a ring-shaped fourth-layer connecting protrusion (37), the upper end face of the fourth shell (8) is formed with a ring-shaped fourth-layer connecting groove (38), and the lower end face of the fifth shell (9) is formed with a ring-shaped fifth-layer connecting protrusion (48).

10. The pyrotechnic switch housing according to claim 9, characterized in that, The bottom of the first-layer connecting groove (14) is formed with eight through holes (15) that penetrate the first-layer shell (5) downwards. The bottom surface of the first-layer shell (5) is formed with a circular countersunk hole (16) corresponding to the eight through holes (15). The second-layer shell (6) is formed with eight through holes (19) corresponding to the first-layer through holes (15). The third-layer shell (7) is formed with eight through holes (26) corresponding to the second-layer through holes (19). The fourth-layer shell (8) is formed with eight through holes (39) corresponding to the third-layer through holes (26). The fifth-layer shell (9) is formed with eight through holes (49) corresponding to the fourth-layer through holes (39). The upper surface of the fifth-layer shell (9) is formed with a regular hexagonal countersunk hole (50) corresponding to each of the five-layer through holes (49).

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