Pyrotechnic switch

Abstract

The application relates to the field of switch design, in particular to a pyrotechnic switch. The pyrotechnic switch comprises a shell, a busbar body and at least one detonation cut-off assembly, and further comprises a temperature rise cut-off assembly and a control chip for cutting off the busbar body, the detonation cut-off assembly comprises a detonation cutter and a detonator, the detonation cutter is an insulator, and the detonator generates an impact force to cut off the busbar when detonated; the temperature rise cut-off assembly comprises a temperature rise cutter and a temperature rise deformation piece, the temperature rise cutter is a conductor, and the temperature rise deformation piece is used for deforming to drive the temperature rise cutter to cut off the busbar when the temperature rises; and the control chip is used for receiving an overvoltage signal generated when the temperature rise cutter cuts off the busbar and detonating the detonator. When the circuit current is overloaded, the temperature in the switch rises, the temperature rise deformation piece deforms to push the temperature rise cutter to cut off the busbar body. The overvoltage generated in the cutting-off process detonates the detonator, an impact force generated by the detonator pushes the detonation cutter to cut off the busbar body, and the self-triggering of the pyrotechnic switch is realized.

Description

TECHNICAL FIELD

[0001] The application relates to the field of switches, in particular to a pyrotechnic switch. BACKGROUND

[0002] The pyrotechnic switch triggers explosion rapidly through a built-in micro-explosive device when detecting system failure, cuts off the conductive part by mechanical force, and thus realizes instantaneous disconnection of the circuit. The pyrotechnic switch has fast response time and can effectively prevent arc or fire risk.

[0003] The existing pyrotechnic switch usually sets a detection device outside, controls the explosive powder in the pyrotechnic switch to explode to generate impact force to cut off the busbar when the detection device detects circuit abnormality. When the device space is small and insufficient to install the detection device outside, the existing pyrotechnic switch cannot be used. Therefore, the purpose of the design is to provide a self-triggering pyrotechnic switch. SUMMARY

[0004] In order to realize self-triggering of the pyrotechnic switch, the application provides a pyrotechnic switch.

[0005] The pyrotechnic switch provided by the application adopts the following technical scheme:

[0006] The pyrotechnic switch comprises a shell, a busbar body and at least one explosion cutting assembly, and further comprises a temperature rise cutting assembly and a control chip for cutting off the busbar body,

[0007] The explosion cutting assembly comprises an explosion cutter and an explosive device, the explosion cutter is an insulator, and the explosive device generates impact force to cut off the busbar when exploding;

[0008] The temperature rise cutting assembly comprises a temperature rise cutter and a temperature rise deformation device, the temperature rise cutter is a conductor, and the temperature rise deformation device is used for deforming to drive the temperature rise cutter to cut off the busbar when the temperature rises;

[0009] The control chip is used for receiving an overvoltage signal generated when the temperature rise cutter cuts off the busbar and exploding the explosive device.

[0010] By adopting the above technical scheme, when the circuit current is overloaded, the temperature in the switch rises, the temperature rise deformation device deforms to push the temperature rise cutter to cut off the busbar body. An overvoltage is generated in the process of cutting off, the control chip receives the overvoltage signal and explodes the explosive device, and impact force is generated to push the explosion cutter to cut off the busbar. Since the explosion cutter is an insulating part, the explosion cutter will quickly break the circuit and extinguish the arc after cutting off the busbar body. Therefore, the scheme realizes self-triggering of the pyrotechnic switch and does not need to set a detection device outside.

[0011] Preferably, the busbar body is formed with a pre-breaking slot extending through the busbar body along the width direction of the busbar body, the bottom of the busbar body is provided with a thin connecting piece connecting the busbar bodies on the left and right sides below the pre-breaking slot, and the temperature rising cutter is located in the pre-breaking slot.

[0012] By adopting the above technical scheme, the pre-breaking slot is arranged on the busbar body, and the busbar bodies on the left and right sides are connected through the thin connecting piece, so that the temperature rising deformation piece only needs to push the temperature rising cutter to move a small amplitude to cut off the thin connecting piece, and the temperature rising cutter, the two side walls of the pre-breaking slot and the thin connecting piece are left with a gap, so that the temperature rising cutter will not be connected with the busbar in the initial state, and an overvoltage will be generated only when the thin connecting piece is cut off.

[0013] Preferably, the temperature rising deformation piece includes a temperature rising deformation member and a temperature rising spring located above the temperature rising deformation member.

[0014] By adopting the above technical scheme, the temperature rising deformation member is hard at room temperature, so the temperature rising deformation member will not be driven to move by the temperature rising spring in the room temperature state. When the temperature in the switch rises due to overloading of the circuit, the temperature rising deformation member becomes soft, so the temperature rising deformation member deforms under the pushing action of the temperature rising spring and drives the temperature rising cutter to cut off the thin connecting piece.

[0015] Preferably, the upper side of the temperature rising cutter is formed with two cutter clamping grooves, the two cutter clamping grooves are left with a spacing and are symmetrically arranged along the center of the temperature rising cutter, and the temperature rising deformation member is formed with a deformation member clamping groove matched with the temperature rising cutter.

[0016] By adopting the above technical scheme, the temperature rising cutter and the temperature rising deformation member are connected through the cooperation of the cutter clamping grooves and the deformation member clamping groove, so that the temperature rising cutter moves after the deformation of the deformation member.

[0017] Preferably, the shell sequentially includes a first layer of shell, a second layer of shell, a third layer of shell, a fourth layer of shell and a fifth layer of shell from bottom to top, the upper end surface of the third layer of shell is formed with a temperature rising cutting installation groove, the front and rear sides of the temperature rising cutting installation groove are formed with temperature rising cutting upper limiting grooves in the vertical direction, the lower end surface of the fourth layer of shell is formed with a temperature rising cutting accommodating groove, the front and rear sides of the temperature rising cutting accommodating groove are formed with temperature rising cutting upper limiting grooves in the vertical direction, and the front and rear ends of the temperature rising cutter are located in the temperature rising cutting upper limiting grooves and the temperature rising cutting lower limiting grooves.

[0018] By adopting the above technical scheme, the temperature rising cutting assembly is arranged on the third layer of shell through the temperature rising cutting installation groove, and the front and rear sides of the temperature rising cutter can be positioned through the cooperation of the temperature rising cutting upper limiting grooves and the temperature rising cutting lower limiting grooves.

[0019] Preferably, the upper end surface of the busbar body is formed with an explosion cutting positioning groove along the width direction of the busbar body, the explosion cutting knife is opposite to the explosion cutting positioning groove, the lower end surface of the busbar body is formed with a breaking groove, the longitudinal section of the breaking groove is in the shape of a triangle with the upper part smaller than the lower part, and the tip of the breaking groove is opposite to the middle part of the explosion cutting positioning groove.

[0020] By adopting the above technical scheme, the busbar is cut along the line connecting the explosion cutting positioning groove and the tip of the breaking groove during the explosion cutting.

[0021] Preferably, the lower end surface of the busbar body is formed with a deformation groove on each side of the breaking groove, the distance between the deformation groove and the breaking groove is equal, the longitudinal section of the deformation groove is in the shape of a rectangle, and the distance between the side walls of the two deformation grooves towards the breaking groove is smaller than the distance between the two side walls of the explosion cutting positioning groove.

[0022] By adopting the above technical scheme, when the busbar is cut along the line connecting the explosion cutting positioning groove and the tip of the breaking groove by the explosion cutting knife, the deformed busbar body will bend along the line connecting the deformation groove and the explosion cutting positioning groove.

[0023] Preferably, the explosion cutting assembly comprises an explosion cutting seat and an explosion element above the explosion cutting seat, the explosion cutting seat comprises a cutting seat top plate in the shape of a cylinder, cutting seat extension plates extending downwards at positions close to the front and rear ends of the lower surface of the cutting seat top plate, an explosion cutting knife in the vertical direction is arranged between the two cutting seat extension plates, and the upper end surface of the cutting seat top plate is formed with a top plate groove accommodating the explosion element.

[0024] By adopting the above technical scheme, when the explosion element explodes, the impact force generated by the explosion will push the explosion cutting seat to move towards the busbar body, and finally cut the busbar body.

[0025] Preferably, the upper end surface of the three-layer shell is formed with an explosion cutting installation groove, a positioning cylinder in the shape of a ring is formed by extending upwards around the explosion cutting installation groove, three-layer guide columns in the vertical direction are formed on the front and rear sides of the positioning cylinder, the upper end surfaces of the three-layer guide columns are flush with the upper end surface of the positioning cylinder, the lower end surface of the four-layer shell is formed with an explosion cutting accommodating groove, four-layer guide grooves are formed on the inner walls of the front and rear sides of the explosion cutting accommodating groove, the upper bottom surface of the explosion cutting accommodating groove is formed with an explosion cutting avoidance groove with a diameter smaller than that of the explosion cutting accommodating groove, the diameter of the explosion cutting avoidance groove is equal to the inner diameter of the positioning cylinder, and the outer diameter of the cutting seat top plate is equal to the inner diameter of the explosion cutting avoidance groove.

[0026] By adopting the technical scheme, the three-layer shell and the four-layer shell can be well matched and aligned through the cooperation of the positioning cylinder and the explosion cutting accommodation groove and the cooperation of the three-layer guide column and the four-layer guide groove. The outer diameter of the cutting seat top plate is equal to the inner diameter of the explosion cutting accommodation groove and the inner diameter of the positioning cylinder, so that the impact force generated when the explosive device explodes can only be released outward through the impact of the cutting seat.

[0027] Preferably, the upper end surface of the one-layer shell is formed with an explosion cutting lower avoidance groove, the bottom surface of the explosion cutting lower avoidance groove is formed with a one-layer abutting column, the upper surface height of the one-layer abutting column is higher than the upper surface height of the one-layer shell, the explosion cutting lower avoidance groove is formed with a one-layer guide column on each of the positions located on the front and back sides of the one-layer abutting column, and the height of the one-layer guide column is higher than the height of the one-layer abutting column; the upper end surface of the two-layer shell is formed with an explosion cutting lower avoidance hole, the two-layer shell is formed with a two-layer guide groove on each of the positions located on the front and back sides of the one-layer guide column, and the inner side wall of the explosion cutting installation groove is formed with a three-layer guide groove on each of the positions located on the front and back sides of the lower end position.

[0028] By adopting the technical scheme, the one-layer abutting column is arranged to abut against the lower end surface of the busbar body, so that the position of the busbar body abutted by the one-layer abutting column will not be downwardly displaced and deformed during the explosion cutting, and the busbar body is more easily and quickly disconnected.

[0029] In summary, the present application has at least one of the following beneficial technical effects:

[0030] 1. When the circuit current is overloaded, the temperature in the switch rises, the temperature rise deformation member deforms to push the temperature rise cutting knife to cut the busbar body. Overvoltage is generated during the cutting process, the control chip receives the overvoltage signal and explodes the explosive device, and the impact force pushes the explosive cutting knife to cut the busbar. Since the explosive cutting knife is an insulating member, the explosive cutting knife will quickly break the arc after cutting the busbar body. Therefore, the scheme realizes the self-triggering of the pyrotechnic switch, and does not need to set a detection device externally.

[0031] 2. The pre-disconnection port is arranged on the busbar body, and the two busbar bodies are connected by a thin connecting piece, so that the temperature rise deformation member only needs to push the temperature rise cutting knife to a small amplitude to cut the thin connecting piece. The two side walls of the temperature rise cutting knife and the two side walls of the pre-disconnection port, and the thin connecting piece have a gap, so that the temperature rise cutting knife will not be in conduction with the busbar in the initial state, and overvoltage will be generated only when the thin connecting piece is cut.

[0032] 3. The temperature rise deformation member is hard at room temperature, so the temperature rise deformation member will not be driven to move by the temperature rise spring at room temperature. When the circuit is overloaded, the temperature in the switch rises, the temperature rise deformation member becomes soft, so the temperature rise deformation member deforms under the pushing action of the temperature rise spring and drives the temperature rise cutting knife to cut the thin connecting piece. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 is a structural diagram of a pyrotechnic switch of example one;

[0034] Figure 2 is an exploded diagram of a pyrotechnic switch of example one;

[0035] Figure 3 is a structural diagram of a one layer housing of example one;

[0036] Figure 4 is a structural diagram of a one layer housing of example one from another perspective;

[0037] Figure 5 is a structural diagram of a two layer housing of example one;

[0038] Figure 6 is a structural diagram of a three layer housing of example one;

[0039] Figure 7 is a cross-sectional view of a three layer housing of example one;

[0040] Figure 8 is a structural diagram of a four layer housing of example one;

[0041] Figure 9 is a structural diagram of a five layer housing of example one;

[0042] Figure 10 is a structural diagram of a five layer housing of example one from another perspective;

[0043] Figure 11 is an exploded diagram of a busbar assembly and a temperature rise cutout assembly, a detonation cutout assembly of example one;

[0044] Figure 12 is a structural diagram of a temperature rise cutout assembly of example one;

[0045] Figure 13 is an exploded diagram of a temperature rise cutout assembly of example one;

[0046] Figure 14 is a structural diagram of a detonation cutout assembly of example one;

[0047] Figure 15 is a structural diagram of a temperature rise deformation of example two.

[0048] Explanation of reference signs: 1, housing; 2, busbar body; 3, temperature rise cut-off assembly; 4, detonation cut-off assembly; 5, one layer of shell; 6, two layers of shell; 7, three layers of shell; 8, four layers of shell; 9, five layers of shell; 10, temperature rise cut-off lower avoiding groove; 11, detonation cut-off lower avoiding groove; 12, one layer of abutting column; 13, one layer of guide column; 14, one layer of connecting groove; 15, one layer of through hole; 16, one layer of counterbore; 17, two layers of connecting protrusion; 19, two layers of through hole; 20, temperature rise cut-off lower avoiding hole; 21, detonation cut-off lower avoiding hole; 22, two layers of guide groove; 23, two layers of abutting column; 24, positioning connecting column; 26, three layers of 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 limiting groove; 31, three layers of installation hole; 32, three layers of guide groove; 33, positioning cylinder; 34, three layers of guide column; 35, busbar accommodating cavity; 36, supporting extension plate; 37, four layers of connecting protrusion; 38, four layers of connecting groove; 39, four layers of through hole; 40, temperature rise cut-off accommodating groove; 41, detonation cut-off accommodating groove; 42, temperature rise cut-off upper limiting groove; 43, four layers of installation hole; 45, four layers of guide groove; 46, detonation cut-off avoiding groove; 48, five layers of connecting protrusion; 49, five layers of through hole; 50, five layers of counterbore; 51, five layers of accommodating cavity; 52, first electric connection part; 53, second electric connection part; 54, temperature rise cutting part; 55, detonation cutting part; 56, electric connection hole; 57, pre-break point; 58, busbar installation hole; 59, thin connecting sheet; 60, pre-break hole; 61, rectangular groove; 62, detonation cut-off positioning groove; 63, deformation groove; 64, break groove; 65, temperature rise cut-off seat; 66, temperature rise cutting knife; 67, temperature rise deformation piece; 68, cut-off seat part; 69, through hole; 70, temperature rise clamping groove; 71, temperature rise deformation piece; 72, cutting knife clamping groove; 73, deformation piece clamping groove; 74, temperature rise installation hole; 75, detonation cut-off seat; 76, temperature rise spring; 77, cut-off seat top plate; 78, cut-off seat extension plate; 79, extension plate guide groove; 80, detonation cutting knife; 81, top plate groove. DETAILED DESCRIPTION

[0049] The following will be described in detail with reference to the accompanying drawings. Figures 1-15 The present application is further described in detail.

[0050] The "upper", "lower", "left" and "right" used in the embodiments of the present application are relative directions for describing positions and are not limited by the positions.

[0051] Embodiment one:

[0052] As Figure 1 And Figure 2As shown, the pyrotechnic switch comprises a shell 1, a busbar body 2, a temperature rise cut-off assembly 3 for cutting off the busbar body 2, and two detonation cut-off assemblies 4. The shell 1 comprises, from bottom to top, a first layer shell 5, a second layer shell 6, a third layer shell 7, a fourth layer shell 8, and a fifth layer shell 9. The busbar body 2 is located in the third layer shell 7, and the temperature rise cut-off assembly 3 and the detonation cut-off assemblies 4 are located in the fourth layer shell 8. The first layer, the second layer, the third layer, the fourth layer, and the fifth layer are only used for naming distinction, and do not limit that the shell 1 must be provided in a five-layer structure.

[0053] As shown in Figure 3 and Figure 4 The upper end surface of the first layer shell 5 is sequentially formed, from left to right, with a temperature rise cut-off lower avoiding groove 10 and two detonation cut-off lower avoiding grooves 11. The temperature rise cut-off lower avoiding groove 10 is in a T shape, and the detonation cut-off lower avoiding grooves 11 are in a circular shape. The bottom surface of each of the detonation cut-off lower avoiding grooves 11 is formed with a first layer abutting column 12, and the upper surface of the first layer abutting column 12 is higher than the upper surface of the first layer shell 5. Each of the detonation cut-off lower avoiding grooves 11 is formed with a first layer guide column 13 on each of the two sides of the first layer abutting column 12, and the height of the first layer guide column 13 is higher than the height of the first layer abutting column 12. The upper end surface of the first layer shell 5 is formed with a circular first layer connecting groove 14. The bottom of the first layer connecting groove 14 is formed with eight first layer through holes 15 penetrating through the first layer shell 5, and the bottom surface of the first layer shell 5 is formed with circular first layer counterbores 16 corresponding to the eight first layer through holes 15. Each of the detonation cut-off lower avoiding grooves 11 is filled with arc extinguishing filler.

[0054] As shown in Figure 5 The upper and lower end surfaces of the second layer shell 6 are each formed with a circular second layer connecting protrusion 17. The second layer shell 6 is formed with eight second layer through holes 19 corresponding to the eight first layer through holes 15. The upper end surface of the second layer shell 6 is sequentially formed, from left to right, with a temperature rise cut-off lower avoiding hole 20 and two detonation cut-off lower avoiding holes 21. The temperature rise cut-off lower avoiding hole 20 is opposite to the temperature rise cut-off lower avoiding groove 10, and the detonation cut-off lower avoiding holes 21 are opposite to the detonation cut-off lower avoiding grooves 11. The temperature rise cut-off lower avoiding hole 20 is in a rectangular shape, and the second layer shell 6 is formed with a second layer guide groove 22 on each of the two sides of each of the detonation cut-off lower avoiding holes 21. The first layer guide column 13 and the second layer guide groove 22 cooperate to play a guiding and positioning role. The second layer shell 6 is formed with a second layer abutting column 23 on each of the two sides of each of the detonation cut-off lower avoiding holes 21. The second layer abutting column 23 is in a strip shape, and the length direction of the second layer abutting column 23 is along the front and back directions. The lower end surface of the second layer shell 6 is formed with eight positioning connecting columns 24 around the two detonation cut-off lower avoiding holes 21, and the eight positioning connecting columns 24 abut and position the inner walls of the detonation cut-off lower avoiding grooves 11.

[0055] As shown in Figure 6 andFigure 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.

[0056] 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.

[0057] like Figure 9 and Figure 10As shown, the lower end face of the five-layer shell 9 is formed with a ring-shaped five-layer connecting protrusion 48, the five-layer shell 9 is formed with eight five-layer through holes 49 corresponding to the four-layer through holes 39, and the upper end face of the five-layer shell 9 is formed with a regular hexagonal five-layer counterbore 50 corresponding to each five-layer through hole 49. The lower end face of the five-layer shell 9 is formed with a five-layer accommodating cavity 51, and the five-layer accommodating cavity 51 is provided with a control chip. In other embodiments, the accommodating cavity can also be arranged in the four-layer shell 8 to install the control chip. When assembled, the shell 1 is connected and assembled together by fasteners.

[0058] As shown in Figure 11 , 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 accommodating cavity 35. The busbar body 2 includes a first electrical connection part 52 and a second electrical connection part 53 at both ends, and a temperature rise cutting part 54 and two sections of detonation cutting parts 55 arranged in sequence between the first electrical connection part 52 and the second electrical connection part 53. The first electrical connection part 52 and the second electrical connection part 53 are both formed with an electrical connection hole 56. The temperature rise cutting part 54 is formed with a pre-breaking gap 57 that penetrates the entire busbar body 2 in the width direction of the busbar body 2, and three busbar mounting holes 58 are formed on both sides of the pre-breaking gap 57. The three busbar mounting holes 58 on the same side are arranged in a straight line, and the distance from all the busbar mounting holes 58 to the pre-breaking gap 57 is equal. The bottom of the busbar body 2 is provided with a thin connecting piece 59 that connects the left and right busbar bodies 2 at a position below the pre-breaking gap 57. The thin connecting piece 59 is oval-shaped, the length of the long axis of the thin connecting piece 59 is less than the width of the busbar body 2, and the position of the thin connecting piece 59 opposite the pre-breaking gap 57 is formed with a plurality of pre-breaking holes 60 arranged in the length direction of the pre-breaking gap 57. The distance between adjacent pre-breaking holes 60 is equal. The front and back sides of the two sections of detonation cutting parts 55 are both formed with a rectangular groove 61, and the upper sides of the two sections of detonation cutting parts 55 are both formed with two detonation cutting positioning grooves 62 in the width direction of the busbar body 2. The detonation cutting positioning grooves 62 are rectangular, and the two sides of the detonation cutting positioning grooves 62 are both chamfered. The lower sides of the two sections of detonation cutting parts 55 are both formed with two deformation grooves 63 and a breaking groove 64 between the two deformation grooves 63. The longitudinal section of the deformation groove 63 is rectangular, the longitudinal section of the breaking groove 64 is triangular with the top smaller than the bottom, the tip of the breaking groove 64 is opposite the middle of the detonation cutting positioning groove 62, and the distance between the side walls of the two deformation grooves 63 towards the breaking groove 64 is slightly smaller than the distance between the side walls of the detonation cutting positioning groove 62.

[0059] As shown in Figure 12 and Figure 13As shown, the temperature rise cut-off assembly 3 comprises a temperature rise cut-off seat 65, a temperature rise cutter 66 on the temperature rise cut-off seat 65, and a temperature rise deformation member 67 connected to the temperature rise cutter 66. The temperature rise cut-off seat 65 comprises two symmetrically arranged cut-off seat components 68, and a through hole 69 is formed on one side of the upper end faces of the two cut-off seat components 68, penetrating the cut-off seat components 68 from top to bottom, and the through hole 69 is broken on the side close to the adjacent cut-off seat component 68. The upper end face of the cut-off seat component 68 is formed with a temperature rise clamping groove 70 transversely penetrating the cut-off seat component 68 in the left-right direction. The temperature rise cut-off seat 65 is located in the temperature rise cut-off installation groove 27, and a space is left between the two cut-off seat components 68, and a vertically arranged temperature rise cutter 66 is installed between the two cut-off 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 close contact with the two cut-off seat components 68. The temperature rise cutter 66 is located in the pre-breaking gap 57 opposite the temperature rise cut-off hole 29, and a 1mm gap is left between the two side walls of the temperature rise cutter 66 and the two side walls of the pre-breaking gap 57, and a gap is 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 in the temperature rise cut-off upper limiting groove 42 and the temperature rise cut-off lower limiting groove 30. The temperature rise cutter 66 is a conductor, and a temperature rise conductor passes through the temperature rise conductor hole and is connected with the temperature rise cutter 66 and the control chip. The upper side of the temperature rise cutter 66 is formed with two cutter clamping grooves 72, and a space is left between the two cutter clamping grooves 72 and the two cutter clamping grooves 72 are symmetrically arranged along the center of the temperature rise cutter 66. The temperature rise deformation member 67 comprises a temperature rise denaturation member 71 which is hard at room temperature and soft after temperature rise, and a temperature rise spring 76 located above the temperature rise denaturation member 71. The temperature rise denaturation member 71 spans across the two cut-off seat components 68, and the two ends of the temperature rise denaturation member 71 are located in the two temperature rise clamping grooves 70. The middle and front and rear sides of the temperature rise denaturation member 71 are formed with denaturation member clamping grooves 73 matched with the temperature rise cutter 66. The upper surface of the temperature rise denaturation member 71 close to the left and right ends, the upper surface of the cut-off seat component 68 close to the front and rear ends, and the bottom of the temperature rise clamping groove 70 are all formed with temperature rise installation holes 74. Six temperature rise installation members pass through the six temperature rise installation holes 74, and the upper and lower ends of the temperature rise installation members pass through the busbar installation holes 58 and are inserted into the three-layer installation holes 31 and the four-layer installation holes 43.

[0060] As 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.

[0061] Specific usage process:

[0062] 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.

[0063] Example 2:

[0064] 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.

[0065] The temperature rising deformation piece 67 is arranged across the two cutting seat parts 68, and the two ends of the temperature rising deformation piece 67 are arranged in the two temperature rising clamping grooves 70, the width of the temperature rising deformation piece 67 is slightly larger than the width of the temperature rising clamping groove 70, and the two are in interference fit, and the fitting tolerance is 0.1-0.3mm. The middle part of the temperature rising deformation piece 67 is formed with a deformation piece clamping groove matched with the temperature rising cutting knife 66, and the temperature rising deformation piece 67 is slightly arched upward from both sides to the middle part, and the position where the deformation piece clamping groove is arranged is the highest point of the upward arch of the temperature rising deformation piece 67. The upper surface of the temperature rising deformation piece 67 is formed with a temperature rising mounting hole 74 near the left and right ends, and is fixed with the cutting seat part 68 through a temperature rising mounting piece. When assembling, first, one end of the temperature rising deformation piece 67 in the width direction is arranged against the bottom of one side of the temperature rising clamping groove 70, and then the other side of the temperature rising deformation piece 67 is arranged in the temperature rising clamping groove 70, when the other side of the temperature rising deformation piece 67 abuts against the middle part of the side wall of the temperature rising clamping groove 70, the other side of the temperature rising deformation piece 67 is pressed downward through a thin plate, so that the other side of the temperature rising deformation piece 67 reaches the bottom of the temperature rising clamping groove 70, and the temperature rising deformation piece 67 is formed in a state of being slightly arched upward along the middle part in the width direction

[0066] When the temperature rising deformation piece 67 is heated, due to the different thermal expansion coefficients of the upper and lower layers, the metal layer with a large thermal expansion coefficient generates internal stress when it is first heated, and when the generated stress breaks through the critical point, the temperature rising deformation piece 67 changes from the state of being arched upward to the state of being arched downward, and in the process of state change, the temperature rising pushing knife is pushed downward to make the temperature rising cutting knife 66 cut the thin connecting piece 59.

[0067] The above are preferred embodiments of the present application, which do not limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A pyrotechnic switch comprising a housing (1), a busbar body (2) and at least one ignition cut-off assembly (4), characterized in that Also include a temperature rise cut-off assembly (3) and a control chip for cutting off the busbar body (2), The detonation cut-off assembly (4) includes a detonation cutter (80) and a detonation device, the detonation cutter (80) is an insulator, and the detonation device generates an impact force when detonated to cut off the busbar by the detonation cutter (80); The temperature rise cut-off assembly (3) includes a temperature rise cutter (66) and a temperature rise deformation device (67), the temperature rise cutter (66) is a conductor, and the temperature rise deformation device (67) is used to deform when the temperature rises to drive the temperature rise cutter (66) to cut off the busbar; The control chip is used to accept the overvoltage signal generated when the temperature rise cutter (66) cuts off the busbar and detonate the detonation device; The temperature rise deformation device (67) includes a temperature rise deformation device (71) and a temperature rise spring (76) above the temperature rise deformation device (71), the upper side of the temperature rise cutter (66) is formed with two cutter clamping grooves (72), the two cutter clamping grooves (72) are spaced apart and symmetrically arranged along the center of the temperature rise cutter (66), and the temperature rise deformation device (71) is formed with a deformation device clamping groove (73) matched with the temperature rise cutter (66).

2. The pyrotechnic switch of claim 1, wherein The busbar body (2) is formed with a pre-breakage port (57) penetrating through the entire busbar body (2) along the width direction of the busbar body (2), the bottom of the busbar body (2) is provided with a thin connecting piece (59) connecting the left and right busbar bodies (2) below the pre-breakage port (57), and the temperature rise cutter (66) is located in the pre-breakage port (57), and the two side walls of the temperature rise cutter (66) and the two side walls of the pre-breakage port (57) and the thin connecting piece (59) are all left with gaps.

3. The pyrotechnic switch of claim 2, wherein, The shell (1) sequentially includes a layer of shell (5), a second layer of shell (6), a third layer of shell (7), a fourth layer of shell (8) and a fifth layer of shell (9) from bottom to top, the upper end face of the third layer of shell (7) is formed with a temperature rise cut-off installation groove (27), the front and rear sides of the temperature rise cut-off installation groove (27) are both formed with a temperature rise cut-off upper limiting groove (42) in the vertical direction, the lower end face of the fourth layer of shell (8) is formed with a temperature rise cut-off containing groove (40), the front and rear sides of the temperature rise cut-off containing groove (40) are both formed with a temperature rise cut-off upper limiting groove (42) in the vertical direction, and the front and rear ends of the temperature rise cutter (66) are located in the temperature rise cut-off upper limiting groove (42) and the temperature rise cut-off lower limiting groove (30).

4. The pyrotechnic switch of claim 3, wherein, The upper end face of the busbar body (2) is formed with an explosion cut-off positioning groove (62) along the width direction of the busbar body (2), the explosion cutter (80) faces the explosion cut-off positioning groove (62), and the lower end face of the busbar body (2) is formed with a breakage groove (64), the longitudinal section of the breakage groove (64) is a triangle with a large lower end and a small upper end, and the tip of the breakage groove (64) faces the middle part of the explosion cut-off positioning groove (62).

5. The pyrotechnic switch of claim 4, wherein, The lower end surface of the busbar body (2) is formed with a deformation groove (63) on both sides of the breaking groove (64), the distance between the deformation groove (63) and the breaking groove (64) is equal, the longitudinal section of the deformation groove (63) is rectangular, and the distance between the side walls of the two deformation grooves (63) towards the side of the breaking groove (64) is smaller than the distance between the two side walls of the detonation cutting positioning groove (62).

6. The pyrotechnic switch of claim 5, wherein, The detonation cutting assembly (4) comprises a detonation cutting seat (75) and a detonating element above the detonation cutting seat (75), the detonation cutting seat (75) comprises a cylindrical cutting seat top plate (77), cutting seat extension plates (78) extending downward from the lower surface of the cutting seat top plate (77) near the front and rear ends, and a detonation cutting knife (80) is arranged between the two cutting seat extension plates (78) in the vertical direction, and the upper end surface of the cutting seat top plate (77) is formed with a top plate groove (81) for accommodating the detonating element.

7. The pyrotechnic switch of claim 6, wherein, The upper end surface of the three-layer shell (7) is formed with a detonation cutting installation groove (28), an annular positioning cylinder (33) is formed by extending upward around the detonation cutting installation groove (28), three-layer guide columns (34) are formed on the front and rear sides of the positioning cylinder (33) in the vertical direction, the upper end surfaces of the three-layer guide columns (34) are flush with the upper end surface of the positioning cylinder (33), the lower end surface of the four-layer shell (8) is formed with a detonation cutting accommodating groove (41), four-layer guide grooves (45) are formed on the inner walls of the front and rear sides of the detonation cutting accommodating groove (41), the upper bottom surface of the detonation cutting accommodating groove (41) is formed with a detonation cutting avoiding groove (46) with a smaller diameter than the detonation cutting accommodating groove (41), the diameter of the detonation cutting avoiding groove (46) is equal to the inner diameter of the positioning cylinder (33), and the outer diameter of the cutting seat top plate (77) is equal to the inner diameter of the detonation cutting avoiding groove (46).

8. The pyrotechnic switch of claim 7, wherein, The upper end surface of the one-layer shell (5) is formed with a detonation cutting lower avoiding groove (11), the bottom surface of the detonation cutting lower avoiding groove (11) is formed with a one-layer abutting column (12), the upper surface of the one-layer abutting column (12) is higher than the upper surface of the one-layer shell (5), one-layer guide columns (13) are formed on the front and rear sides of the one-layer abutting column (12) in the detonation cutting lower avoiding groove (11), and the height of the one-layer guide columns (13) is higher than the height of the one-layer abutting column (12); the upper end surface of the two-layer shell (6) is formed with a detonation cutting lower avoiding hole (21), the two-layer shell (6) is formed with two-layer guide grooves (22) on the front and rear sides of the detonation cutting lower avoiding hole (21), and the two-layer guide grooves (22) cooperate with the one-layer guide columns (13); the inner side walls of the detonation cutting installation groove (28) near the lower end are formed with three-layer guide grooves (32) on the front and rear sides, and the three-layer guide grooves (32) cooperate with the one-layer guide columns (13).

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