A single-sided, low-impact expansion inline pyrotechnic separation device

Abstract

This application provides a low-impact expansion pipeline pyrotechnic separation device with unilateral separation, relating to the field of spacecraft technology. The device includes: a separation plate, a protective cover, a flat tube, filler material, an explosive cord, and a connecting limiting plate. The limiting sides of the protective cover and the connecting limiting plate are connected to the separation plate via fasteners. A charge groove is located at the center of the protective cover, and a weakening groove is formed on the separation plate. The vertical axis of the charge groove in the protective cover coincides with the axis of the weakening groove in the separation plate. The explosive cord is located at the center of the flat tube, and filler material is installed between the explosive cord and the flat tube. The flat tube, filler material, and explosive cord together form an expansion tube, which is placed in the charge groove of the protective cover. The technical solution provided by this application, under the limiting action of the protective cover and the connecting limiting plate, achieves separation by unilateral expansion of the expansion tube, which destroys the weakening groove of the separation plate. This avoids the generation of excess explosive products during the separation process and improves the safety of the separation operation.

Description

Technical Field

[0001] This application belongs to the technical field of spacecrafts, and particularly relates to a low-impact expansion pipeline type pyrotechnic separation device with unilateral separation. Background Art

[0002] In the aerospace field, pyrotechnic separation devices, as key components for spacecrafts to achieve tasks such as inter-stage separation and ultimately ensure the successful completion of launch missions, have been systematically studied. According to the actuation method, pyrotechnic separation mainly includes two types: point-type explosive separation devices and line-type explosive separation devices.

[0003] In related technologies, point-type separation devices are limited by the assembly strength, with relatively limited applicable scenarios. Usually, a large number of separation devices need to actuate simultaneously, which has extremely high requirements for the synchronism of pyrotechnics and limited reliability. While line-type separation devices have high load-bearing capacity, rapid response, short working time, and high synchronism, and generate lower impact loads during the working process compared to other types of line-type separation devices.

[0004] However, expansion pipeline type pyrotechnic separation devices often have bilateral separation, with complex structures, large weights, high requirements for the reliability of the separation devices. The separation plate on the side close to the rocket body is likely to fly into the rocket interior during the separation process, which is also not conducive to the safety of the equipment and devices inside the rocket body. Summary of the Invention

[0005] This application provides a low-impact expansion pipeline type pyrotechnic separation device with unilateral separation, which solves the problems in related technologies that expansion pipeline type pyrotechnic separation devices often have bilateral separation, with complex structures, large weights, high requirements for the reliability of the separation devices, and the separation plate on the side close to the rocket body is likely to fly into the rocket interior during the separation process, which is also not conducive to the safety of the equipment and devices inside the rocket body.

[0006] To achieve the above object, this application adopts the following technical solutions:

[0007] In a first aspect, an embodiment of this application provides a low-impact expansion pipeline type pyrotechnic separation device with unilateral separation, and the device includes:

[0008] A separation plate, a protective cover, a flat tube, a filler, an explosive cord, and a connection limiting plate;

[0009] The protective cover is in a "U" shape and is connected to the separation plate through fasteners. The limiting side of the connection limiting plate is connected to the separation plate through the fasteners;

[0010] The protective cover has a loading groove at its center, and the separation plate has a weakening groove. The protective cover is located above the separation plate, and the vertical axis of the loading groove of the protective cover coincides with the axis of the weakening groove of the separation plate.

[0011] The explosive cord is located at the center of the inside of the flat tube, and a filler is installed between the explosive cord and the flat tube. The flat tube, the filler, and the explosive cord together form an expansion tube, which is placed in the loading groove of the protective cover.

[0012] The expansion tube has a parallel structure on its upper and lower sides, which are connected by a semi-circular boundary. The cross-section is perpendicular to the axis of the flat tube.

[0013] Optionally, the surface of the separating plate with the weakening groove is the first surface, and the surface of the separating plate that contacts the protective cover is the second surface.

[0014] The thickness between the bottom of the weakening groove and the second surface is greater than or equal to a preset thickness threshold and less than a preset size limit, which is determined based on the cross-sectional radius corresponding to the charge amount of the explosive cord.

[0015] Optionally, the distance between the bottom of the weakening groove and the first surface is the groove depth. The distance from the first surface to the second surface is equal to the thickness of the separation plane. The thickness of the separation plane With the groove depth Must meet:

[0016] .

[0017] Optionally, a chamfer is provided at the point where the thickness of the separation plane decreases for a transition, wherein the point where the thickness decreases is 2.5 meters from the center of the weakening groove on the separation plane. The chamfer is located at a position where the degree range of the chamfer is 100 degrees to 160 degrees, and the length of the long side of the weakening groove is [missing information]. .

[0018] Optionally, the surface of the separating plate with the weakening groove is designated as the first surface, and the surface of the separating plate that contacts the protective cover is designated as the second surface. The distance between the first surface and the second surface is equal to the thickness of the separating plane. ;

[0019] The separating plate is located 2.5 meters from the center of the weakening groove. The thickness is reduced at this point, and the length of the long side of the weakening groove is [missing information]. The reduced thickness Must meet:

[0020] .

[0021] Optionally, the thickness of the protective cover on the upper and lower sides of the expansion tube... The thickness of the structure damaged when the expansion tube expands and does work is greater than the upper limit of the structural thickness. The thickness of the assembly part of the protective cover Not less than .

[0022] Optionally, all structural transitions in the protective cover and the connecting limiting plate are provided with rounded corners to eliminate stress concentration, and the radius of the rounded corners ranges from 1 mm to 2.5 mm.

[0023] Optionally, the weakening groove is a trapezoidal structure, the short side of the weakening groove is an arc-shaped structure, and the arc-shaped structure is tangent to the waist of the trapezoidal structure.

[0024] Optionally, the long side of the weakening groove is located on the first surface of the separating plate, the inner angle between the waist of the trapezoidal structure and the long side of the weakening groove is less than or equal to 80°, and the dimension of the long side of the weakening groove is... satisfy:

[0025]

[0026] Wherein, the distance between the bottom of the weakening groove and the first surface is the groove depth. .

[0027] Optionally, the chord length corresponding to the arc-shaped structure of the weakening groove. satisfy:

[0028] and

[0029] Wherein, the length of the weakening groove is... The thickness between the bottom of the weakening groove and the second surface of the separating plate is .

[0030] This application provides a single-sided separation low-impact expansion pipeline pyrotechnic separation device. Based on the relationship between the degree of structural damage caused by the explosion impact and the material failure criteria, an upper limit is established for the thickness of the structure damaged by the expansion tube expansion work. This allows for the simultaneous determination of the upper limit of the separation plate weakening groove design and the lower limit of the protective cover protection thickness design.

[0031] Furthermore, the separation plate is located 2.5 meters from the center of the weakening groove. The thickness is reduced to the size This can further improve the lightweight level of the separation device.

[0032] In addition, the trapezoidal structure weakening groove, which has an arc-shaped short side and is similar to a trapezoid, reduces the amount of explosive charge in the expansion tube while ensuring the separation device can separate smoothly. This reduces the high-frequency vibration impact transmitted to the structure during the operation of the separation device from the impact source.

[0033] In addition, including the separation plate, protective cover and connecting limit plate, this device can achieve single-sided separation compared to existing similar separation devices, and is applicable to a wider range of separation task scenarios.

[0034] It should be noted that the low-impact expansion pipeline pyrotechnic separation device with single-sided separation provided in this application only separates one side. Compared with other linear pyrotechnic separation devices where the explosive impact acts directly on the separation plate, the separation plate is damaged only through the expansion tube. No extra explosive products are generated during the separation process, which improves the safety of the separation operation.

[0035] Moreover, compared to the existing two-sided separation form of similar separation devices, it only requires a single-sided separation plate, which reduces the space requirement on the non-separation side, effectively reducing the overall weight of the separation device and achieving a high level of equipment lightweighting.

[0036] Furthermore, compared to the two-sided separation method of existing similar separation devices, only a single-sided separation plate is required. The acceleration impact response frequency domain peak generated by the expansion tube acting on the separation plate is lower, resulting in less interference to the electronic components inside the aircraft and further improving the safety of related equipment. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the structure of a single-sided separation low-impact expansion pipeline pyrotechnic separation device proposed in an embodiment of this application;

[0038] Figure 2 This is a structural schematic diagram of the separation plate, separation plane, and key dimensions of a single-sided separation low-impact expansion pipeline pyrotechnic separation device proposed in an embodiment of this application;

[0039] Figure 3 This is a structural schematic diagram of the separation plate, weakening groove, and key dimensions of a single-sided separation low-impact expansion pipeline pyrotechnic separation device proposed in an embodiment of this application.

[0040] Figure 4 This is a schematic diagram of the key dimensions of the protective cover of a single-sided separation low-impact expansion pipeline pyrotechnic separation device proposed in this application, and its structure in the separation plan view.

[0041] Among them, 1-separation plate, 2-protective cover, 3-flat tube, 4-filler, 5-explosive cord, 6-connecting limiting plate, 7-bolt. Detailed Implementation

[0042] In the following description, specific details such as particular system structures and technologies are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application can also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known pyrolysis techniques and pyrolysis equipment are omitted so as not to obscure the description of this application with unnecessary detail.

[0043] The terminology used in the following embodiments is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. As used in the specification and appended claims of this application, the singular expressions “a,” “the,” “the,” and “the” are intended to also include expressions such as “one or more,” unless the context clearly indicates otherwise.

[0044] With the development of my country's aerospace technology, the instruments and equipment carried by spacecraft are becoming more and more sophisticated. Precision instruments have extremely high requirements for the transportation environment. They must be protected from damage by debris generated during the launch mission, as well as from excessive vibration and impact loads that could damage the equipment.

[0045] Pyrotechnic separation devices, with their fast response, low delay, and high synchronization, have unique advantages for separation tasks of certain aerospace structures. Among them, the gunpowder in the expansion tube separation device indirectly acts on and destroys the separation structure through the expansion of the flat tube, which not only maintains the original advantages but also has the characteristics of low impact, thus enabling its widespread application.

[0046] Correspondingly, pyrotechnic separation devices, as key components for spacecraft to achieve interstage separation and ultimately ensure the successful completion of launch missions, have been studied systematically. Based on their actuation methods, pyrotechnic separation devices are mainly classified into two types: point-type explosion separation devices and line-type explosion separation devices.

[0047] In related technologies, point-type separation devices are limited by assembly strength, resulting in relatively limited applicable scenarios. Furthermore, they typically require a large number of separation devices to operate simultaneously, placing extremely high demands on the synchronization of pyrotechnic components and limiting reliability. In contrast, linear separation devices offer high load-bearing capacity, rapid response, short operating time, and high synchronization, while generating lower impact loads during operation compared to other types of linear separation devices.

[0048] However, expansion pipeline pyrotechnic separation devices are often double-sided separation devices. They have complex structures, are heavy, and still generate significant impacts. During the separation process, debris can easily be generated, affecting instruments and equipment. This places high demands on the reliability of the separation device. The separation plate closer to the rocket body is prone to flying into the rocket's interior during the separation process, which is also detrimental to the safety of equipment and devices inside the rocket body.

[0049] Therefore, this application provides a single-sided separation low-impact expansion pipeline pyrotechnic separation device. The separation plate is connected to the connecting limiting plate and the "U"-shaped protective cover by fasteners. A charge groove is provided at the center of the protective cover. A weakening groove is provided on the separation plate. The protective cover is located above the separation plate. The vertical axis of the charge groove of the protective cover coincides with the axis of the weakening groove of the separation plate.

[0050] Furthermore, the explosive cord is located at the center of the flat tube, and there is filler between the explosive cord and the flat tube. The flat tube, filler, and explosive together form an expansion tube, which is placed in the loading groove of the protective cover. The upper and lower sides of the cross-section of the expansion tube are parallel and connected by a semi-circular boundary. The cross-section is perpendicular to the axis of the flat tube.

[0051] This application provides a single-sided separation low-impact expansion pipeline pyrotechnic separation device. Based on the relationship between the degree of structural damage caused by the explosion impact and the material failure criteria, an upper limit is established for the thickness of the structure damaged by the expansion tube expansion work. This allows for the simultaneous determination of the upper limit of the separation plate weakening groove design and the lower limit of the protective cover protection thickness design.

[0052] Furthermore, the separation plate is located 2.5 meters from the center of the weakening groove. The thickness is reduced to the size This can further improve the lightweight level of the separation device.

[0053] In addition, the trapezoidal structure weakening groove, which has an arc-shaped short side and is similar to a trapezoid, reduces the amount of explosive charge in the expansion tube while ensuring the separation device can separate smoothly. This reduces the high-frequency vibration impact transmitted to the structure during the operation of the separation device from the impact source.

[0054] In addition, including the separation plate, protective cover and connecting limit plate, this device can achieve single-sided separation compared to existing similar separation devices, and is applicable to a wider range of separation task scenarios.

[0055] It should be noted that the low-impact expansion pipeline pyrotechnic separation device with single-sided separation provided in this application only separates one side. Compared with other linear pyrotechnic separation devices where the explosive impact acts directly on the separation plate, the separation plate is damaged only through the expansion tube. No extra explosive products are generated during the separation process, which improves the safety of the separation operation.

[0056] Moreover, compared to the existing two-sided separation form of similar separation devices, it only requires a single-sided separation plate, which reduces the space requirement on the non-separation side, effectively reducing the overall weight of the separation device and achieving a high level of equipment lightweighting.

[0057] Furthermore, compared to the two-sided separation method of existing similar separation devices, only a single-sided separation plate is required. The acceleration impact response frequency domain peak generated by the expansion tube acting on the separation plate is lower, resulting in less interference to the electronic components inside the aircraft and further improving the safety of related equipment.

[0058] See Figure 1 , Figure 1 This is a schematic diagram of the structure of a single-sided separation low-impact expansion pipeline pyrotechnic separation device proposed in an embodiment of this application. The single-sided separation low-impact expansion pipeline pyrotechnic separation device of this application includes: a separation plate 1, a protective cover 2, a flat tube 3, a filler 4, an explosive cord 5, and a connecting limiting plate 6.

[0059] The protective cover 2 is U-shaped and can be connected to the separation plate 1 via fasteners. Similarly, the limiting side of the connecting limiting plate 6 can also be connected to the separation plate 1 via fasteners.

[0060] Furthermore, a loading groove can be provided at the center of the protective cover 2, and a weakening groove is provided on the separation plate 1. The protective cover 2 can be located above the separation plate 1, and the vertical axis of the loading groove of the protective cover 2 can coincide with the axis of the weakening groove of the separation plate 1.

[0061] Additionally, the explosive cord 5 can be located at the center of the flat tube 3, with filler 4 between the explosive cord 5 and the flat tube 3. The flat tube 3, filler 4, and explosive cord 5 together form an expansion tube. Correspondingly, the expansion tube can be placed in the loading slot of the protective cover 2.

[0062] Furthermore, such as Figure 1 As shown, the upper and lower sides of the expansion tube's cross-section are parallel and connected by a semi-circular boundary. The cross-section is perpendicular to the axis of the flat tube.

[0063] For example, participate Figure 1 The overall structure of the expansion tube can be semi-circular at both ends and rectangular in the middle, with the shorter side of the rectangle connecting to the semi-circular structure. The longer side of the rectangular structure can be 14.1 mm, and it can be designed with a diameter ratio of 2:1 between the rectangular and semi-circular structures, resulting in a semi-circular diameter of 7.2 mm.

[0064] Accordingly, based on the structural characteristics of the expansion tube, the cross-sectional radius corresponding to the charge amount of the circular explosive cord 5 at the center of the expansion tube is designed. It can be 0.6 mm, which is the cross-sectional radius of the explosive cord 5. It is 1 / 6 of the radius of the expansion tube's semicircle, and less than 0.3 times the radius of the expansion tube's semicircle. This cross-sectional area corresponds to a standard volume density of 1.6 grams per cubic centimeter (g / cm³) of RDX detonating cord.

[0065] Moreover, such as Figure 2 As shown, the surface of the separating plate 1 with the weakening groove is the first surface, and the surface of the separating plate 1 that contacts the protective cover 2 is the second surface. In order to ensure that the explosive charge 5 is used as small as possible to reduce the high-frequency vibration generated by the explosion impact, and at the same time to ensure that the connection strength of the separating plate 1 has a certain margin, the thickness between the bottom of the weakening groove and the second surface can be designed.

[0066] For example, such as Figure 2 As shown, the thickness between the bottom of the groove and the second surface It can be 2.3mm, and the distance between the first surface and the second surface, i.e., the thickness of the separation plane. It can be 6mm. The separation plane is a cross-section of the separation plate.

[0067] Accordingly, based on the determined separation plane thickness The value of the design weakening groove, the height from the bottom of the groove to the first surface, is the groove depth. The closer to the upper limit, the more advantageous it is for lightweight structural design, but at the same time, it will reduce the load-bearing capacity of the structure. To ensure that the load-bearing capacity of separation plate 1 has a certain margin, and to reduce the weight of separation plate 1 as much as possible to improve the lightweight level of the separation device, it is possible to design... It is 3.6mm to meet the corresponding design requirements.

[0068] For example, the distance between the bottom of the weakening groove and the first surface is the groove depth. The distance between the first surface and the second surface is equal to the thickness of the separation plane. Separation plane thickness With trench depth Must meet:

[0069] .

[0070] Correspondingly, the thickness between the bottom of the weakening groove and the second surface can be greater than or equal to a preset thickness threshold, and less than a preset upper limit of size. This upper limit of size can be determined based on the cross-sectional radius corresponding to the charge amount of the explosive cord.

[0071] For example, the thickness between the bottom of the groove and the second surface. It can satisfy:

[0072]

[0073] in, To establish the upper limit of the thickness of the structure damaged by the expansion tube expansion work, based on the relationship between the degree of structural damage caused by the explosion impact and the material failure criteria.

[0074] Correspondingly, It can be represented as:

[0075]

[0076] in, The radius of the cross section corresponding to the charge amount of the circular explosive cord 5 at the center of the expansion tube.

[0077] Alternatively, for the sake of simplified calculation... It can be represented as:

[0078]

[0079] Accordingly, substitute Calculations yielded .

[0080] In addition, to ensure that the separation device can successfully perform the separation operation, and to increase the tensile stress of the weakening groove under the action of the detonation wave, the amount of explosive cable 5 required during the separation process can be reduced.

[0081] Furthermore, the weakening groove can be a trapezoidal structure, and the short side of the weakening groove can be an arc-shaped structure, which is tangent to the waist of the trapezoidal structure.

[0082] For example, the shape of the weakening groove can be set as trapezoidal, and the groove depth can be designed. =3.6mm, which is the height of the trapezoid. The long side of the weakening groove is located on the first surface. The bottom of the groove is set as an arc structure with the short side of the trapezoid as the diameter. This arc structure can be tangent to the generatrix of the trapezoid.

[0083] Furthermore, such as Figure 3 As shown, to ensure that the angle between the generatrix and the inner side of the longer side is ≤80 degrees (°), the dimensions of the longer side are... Must meet For example, the size of the long side can be designed. It is 4.2mm, short side The size is 1.1mm.

[0084] Furthermore, to reduce the weight of the non-separated portion of the separation plate 1, the thickness of the separation plate 1 beyond 10.5 mm from the center of the weakening groove can be reduced, such as by designing the thickness of this area... It can be 4mm.

[0085] In addition, such as Figure 2 As shown, to eliminate stress concentration at the thickness change point of the separation plane, a chamfer can be added at the point where the thickness decreases to create a smooth transition. The thickness decrease point can be located 2.5 meters from the center of the weakening groove on the separation plane. The position. Moreover, the chamfer angle ranges from 100 degrees to 160 degrees.

[0086] For example, such as Figure 2 As shown, the thickness change of the separation plane is achieved by setting a chamfer at the thickness junction of the separation plate 1, located 10.5 mm away from the center of the weakening groove. The degree can be 150 degrees.

[0087] In one alternative embodiment, such as Figure 4 As shown, the mounting groove of the protective cover 2 can be set according to the shape of the expansion tube. The inner side of the mounting groove can be rectangular, and the inner dimension can be matched with the expansion tube with a clearance of less than 1mm.

[0088] It should be noted that the thickness of the protective cover 2 on the upper and lower sides of the expansion tube is... It can exceed the upper limit of the structural thickness dimension that is damaged when the expansion tube expands and does work. The thickness of the remaining parts of the expansion tube... Not less than .

[0089] For example, it can be designed The thickness is 7mm, and the thickness in other locations is [missing information]. To ensure assembly strength, it can be designed to be 5mm.

[0090] In another alternative embodiment, the non-assembly side of the protective cover 2 can be the limiting side, and the limiting side of the protective cover 2 can be provided with an extension section, so that the limiting can be achieved at the junction of the limiting structure connecting the limiting plate 6 through the extension section.

[0091] For example, the thickness of the limiting side extension can be the same as the thickness of the assembly part of the protective cover 2. Similarly, the thickness can be 5mm. Moreover, the thickness of the limiting structure and the plate thickness of the connecting limiting plate 6 can both be 5mm.

[0092] Furthermore, all structural transitions of the protective cover 2 and the connecting limiting plate 6 are rounded to eliminate stress concentration. The radius of the rounded corners can range from 1mm to 2.5mm. For example, at a thickness of 7mm, the rounded corner radius can be 2.5mm, and at a thickness of 5mm, the rounded corner radius can be 1.5mm.

[0093] Accordingly, in the operation of the single-sided separation low-impact expansion pipeline pyrotechnic separation device provided in this application example, through experiments and finite element simulation, it can be successfully operated according to the following process:

[0094] When the explosive cord 5 in the center of the flat tube 3 is detonated, the expansion of the filler 4 pushes the flat tube 3 to expand outward. The protective cover 2 guides the flat tube 3 to expand in a direction perpendicular to the long side of the flat tube 3. Under the restriction of the connecting limiting plate 6, the flat tube 3 expands towards the separation plate 1. After being acted upon by the flat tube 3, the separation plate 1 breaks at the weakening groove, completing the separation action.

[0095] In summary, the single-sided separation low-impact expansion pipeline pyrotechnic separation device provided in this application example connects the separation plate to the connecting limit plate and the "U"-shaped protective cover respectively by fasteners. A charge slot is set at the center of the protective cover, and a weakening groove is opened on the separation plate. The protective cover is located above the separation plate, and the vertical axis of the charge slot of the protective cover coincides with the axis of the weakening groove of the separation plate. It can meet the requirements of high load-bearing capacity, rapid response, short working time and high synchronization required by the project.

[0096] Furthermore, the explosive cord is located at the center of the flat tube, and there is filler between the explosive cord and the flat tube. The flat tube, filler, and explosive together form an expansion tube, which is placed in the loading groove of the protective cover. The upper and lower sides of the cross-section of the expansion tube are parallel and connected by a semi-circular boundary. The cross-section is perpendicular to the axis of the flat tube.

[0097] This application provides a single-sided separation low-impact expansion pipeline pyrotechnic separation device. Based on the relationship between the degree of structural damage caused by the explosion impact and the material failure criteria, an upper limit is established for the thickness of the structure damaged by the expansion tube expansion work. This allows for the simultaneous determination of the upper limit of the separation plate weakening groove design and the lower limit of the protective cover protection thickness design.

[0098] Furthermore, the separation plate is located 2.5 meters from the center of the weakening groove. The thickness is reduced to the size This can further improve the lightweight level of the separation device.

[0099] In addition, the trapezoidal structure weakening groove, which has an arc-shaped short side and is similar to a trapezoid, reduces the amount of explosive charge in the expansion tube while ensuring the separation device can separate smoothly. This reduces the high-frequency vibration impact transmitted to the structure during the operation of the separation device from the impact source.

[0100] In addition, including the separation plate, protective cover and connecting limit plate, this device can achieve single-sided separation compared to existing similar separation devices, and is applicable to a wider range of separation task scenarios.

[0101] It should be noted that the low-impact expansion pipeline pyrotechnic separation device with single-sided separation provided in this application only separates one side. Compared with other linear pyrotechnic separation devices where the explosive impact acts directly on the separation plate, the separation plate is damaged only through the expansion tube. No extra explosive products are generated during the separation process, which improves the safety of the separation operation.

[0102] Moreover, compared to the existing two-sided separation form of similar separation devices, it only requires a single-sided separation plate, which reduces the space requirement on the non-separation side, effectively reducing the overall weight of the separation device and achieving a high level of equipment lightweighting.

[0103] Furthermore, compared to the two-sided separation method of existing similar separation devices, only a single-sided separation plate is required. The acceleration impact response frequency domain peak generated by the expansion tube acting on the separation plate is lower, resulting in less interference to the electronic components inside the aircraft and further improving the safety of related equipment.

[0104] Furthermore, compared to existing similar separation devices, it can achieve single-sided separation without generating excess explosion products during the separation process. It also only requires a single-sided separation plate 1, which reduces the space requirement on the non-separation side and effectively reduces the overall weight of the separation device. The peak value of the acceleration impact response in the frequency domain generated during operation is lower than that of the detonation wave acting directly on the structure. It has the advantages of wide applicability, high safety, lightweight, and low impact.

[0105] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0106] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0107] In the embodiments provided in this application, it should be understood that the disclosed apparatus / devices and methods can be implemented in other ways. For example, the apparatus / device embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0108] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0109] It should also be understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0110] As used in this application specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if detected [the described condition or event]" may be interpreted, depending on the context, as meaning "once determined," "in response to determination," "once detected [the described condition or event]," or "in response to detection [the described condition or event]."

[0111] Furthermore, in the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0112] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0113] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A low-impact expansion inline pyrotechnic separation device with single-sided separation, characterized in that, The device includes: a separation plate, a protective cover, a flat tube, a filler, an explosive cord, and a connection limiting plate; The protective cover is in a "U" shape and is connected to the separation plate through fasteners. The limiting side of the connection limiting plate is connected to the separation plate through the fasteners; A charge groove is provided at the center of the protective cover. A weakening groove is formed on the separation plate. The protective cover is located above the separation plate, and the vertical axis of the charge groove of the protective cover coincides with the axis of the weakening groove of the separation plate; The surface of the separation plate with the weakening groove is the first surface, and the surface of the separation plate in contact with the protective cover is the second surface; The thickness between the bottom of the weakening groove and the second surface is greater than or equal to a preset thickness threshold and less than a preset size upper limit, and the size upper limit is determined according to the cross-sectional radius corresponding to the charge amount of the explosive cord; The distance between the bottom of the weakening groove and the first surface is the groove depth. The distance from the first surface to the second surface is equal to the thickness of the separation plane. The thickness of the separation plane With the groove depth Must meet: ； A chamfer is provided at the point where the thickness of the separation plane decreases to facilitate a transition. This point where the thickness decreases is 2.5 meters from the center of the weakening groove on the separation plane. The chamfer is located at a position where the degree range of the chamfer is 100 degrees to 160 degrees, and the length of the long side of the weakening groove is [missing information]. ; The distance between the first surface and the second surface is equal to the thickness of the separation plane. ; The separating plate is located 2.5 meters from the center of the weakening groove. The thickness is reduced at this point, and the length of the long side of the weakening groove is [missing information]. The reduced thickness Must meet: ； The explosive cord is located at the inner center of the flat tube. A filler is filled between the explosive cord and the flat tube. The flat tube, the filler, and the explosive cord together form an expansion tube, and the expansion tube is placed in the charge groove of the protective cover; The upper and lower sides of the cross-section of the expansion tube are in a parallel structure and are connected by a semi-circular boundary, and the cross-section is perpendicular to the axis of the flat tube; The thickness of the protective cover on the upper and lower sides of the expansion tube The thickness of the structure damaged when the expansion tube expands and does work is greater than the upper limit of the structural thickness. The thickness of the assembly part of the protective cover Not less than .

2. The apparatus as claimed in claim 1, characterized in that, At all structural turning points of the protective cover and the connection limiting plate, rounded corners are provided to eliminate stress concentration, and the radius range of the rounded corners is from 1 mm to 2.5 mm.

3. The apparatus as described in claim 1, characterized in that, The weakening groove is a trapezoid-like structure, and the short side of the weakening groove is an arc structure, and the arc structure is tangent to the waist of the trapezoid-like structure.

4. The apparatus as described in claim 3, characterized in that, The long side of the weakening groove is located on the first surface of the separating plate, and the inner angle between the waist of the trapezoidal structure and the long side of the weakening groove is less than or equal to 80°. The dimension of the long side of the weakening groove is... satisfy: Wherein, the distance between the bottom of the weakening groove and the first surface is the groove depth. .

5. The apparatus as claimed in claim 3, characterized in that, The chord length corresponding to the arc-shaped structure of the weakening groove satisfy: and Wherein, the length of the weakening groove is... The thickness between the bottom of the weakening groove and the second surface of the separating plate is .

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