Single-side separation low-impact expansion pipeline type pyrotechnic separation device

Abstract

The invention provides a single-side separation low-impact expansion pipeline type pyrotechnic separation device, and relates to the technical field of spacecrafts, the device comprises a separation flat plate, a protection cover, a flat pipe, a filler, an explosive cable and a connection limiting plate; the protective cover and the limiting side of the connecting limiting plate are connected with the separating flat plate through fasteners. A charging groove is formed in the center of the protection cover, a weakening groove is formed in the separation flat plate, and the vertical axis of the charging groove of the protection cover coincides with the axis of the weakening groove of the separation flat plate. The explosive cable is located in the center of the interior of the flat pipe, filler is arranged between the explosive cable and the flat pipe, the flat pipe, the filler and the explosive cable jointly form an expansion pipe, and the expansion pipe is arranged in the explosive containing groove of the protective cover. According to the technical scheme provided by the invention, under the limiting action of the protective cover and the connecting limiting plate, single-side expansion acting is performed through the expansion pipe, the weakening groove of the separation flat plate is damaged to realize separation, redundant explosive products can be prevented from being generated in the separation process, and the separation actuation safety is improved.

Description

Technical Field

[0001] This application belongs to the technical field of spacecraft, 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 spacecraft to achieve tasks such as inter-stage separation and ultimately ensure the smooth completion of launch missions, have been systematically studied. According to the actuation method, pyrotechnic separation is mainly divided into two categories: point-type explosive separation devices and line-type explosive separation devices.

[0003] In related technologies, point-type separation devices are limited by assembly strength, with relatively limited applicable scenarios, and usually require a large number of separation devices 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 produce 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 separation devices, and the separation plate on the side close to the rocket body is prone to flying 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 separation devices, and the separation plate on the side close to the rocket body is prone to flying 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: 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: 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, and the limiting side of the connection limiting plate is connected to the separation plate through the fasteners; A charge slot is provided at the center position of the protective cover, a weakened slot 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 weakened slot of the separation plate; The explosive cord is located at the inner center of the flat tube, a filler is placed between the explosive cord and the flat tube, and the flat tube, the filler and the explosive cord together form an expansion tube, which is placed in the charge slot of the protective cover; The upper and lower sides of the cross section of the expansion tube are parallel and connected by a semicircular boundary, and the cross section is perpendicular to the axis of the flat tube.

[0007] Optionally, the surface of the separation plate provided with the weakened 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 weakened groove and the second surface is greater than or equal to a preset thickness threshold and less than a preset upper size limit, and the upper size limit is determined according to the cross-sectional radius corresponding to the charge amount of the explosive cord.

[0008] Optionally, the distance between the bottom of the weakened groove and the first surface is the groove depth , the distance from the first surface to the second surface is the thickness of the separation plane , the separation plane thickness With the groove depth Need to meet: .

[0009] Optionally, a chamfer is provided at the thickness reduction portion of the separation plane for transition, and the thickness reduction portion is 2.5° from the separation plane to the center of the weakening groove. The chamfer angle is in the range of 100 to 160 degrees, and the long side of the weakening groove is .

[0010] Optionally, the surface of the separation plate provided with the weakening groove is the first surface, the surface of the separation plate in contact with the protective cover is the second surface, and the distance from the first surface to the second surface is the thickness of the separation plane. ; The separation plate is 2.5 meters away from the center of the weakening groove The thickness at the weakening groove is reduced, and the size of the long side of the weakening groove is , the thickness after reduction Need to meet: .

[0011] Optionally, the thickness of the protective cover on the upper and lower sides of the expansion tube is , which is greater than the upper limit of the thickness of the structure destroyed when the expansion tube expands and works , the thickness of the protective cover assembly part No less than .

[0012] Optionally, all structural turning points in the protective cover and the connecting limit 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.

[0013] 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.

[0014] Optionally, the long side of the weakening groove is located on the first surface of the separation 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 size of the long side of the weakening groove is satisfy: The distance between the bottom of the weakened groove and the first surface is the groove depth. .

[0015] Optionally, the chord length corresponding to the arc structure of the weakening groove satisfy: and Wherein, the size of the long side of the weakening groove is The thickness between the bottom of the weakened groove and the second surface of the separation plate is .

[0016] An embodiment of the present application provides a single-side separated low-impact expansion pipeline-type pyrotechnic separation device. According to the relationship between the degree of structural damage caused by the explosion impact and the material failure criterion, an upper limit of the thickness dimension of the structure damaged by the expansion work of the expansion tube is established, and the design upper limit of the weakening groove of the separation plate and the design lower limit of the protective thickness of the protective cover can be determined at the same time.

[0017] Moreover, the separation plate is 2.5 meters away from the center of the weakening groove. The thickness is reduced to size , which can further improve the lightweight level of the separation device.

[0018] In addition, the weakening groove of the trapezoidal structure, which has an arc-shaped short side and a trapezoidal-shaped structure, reduces the amount of gunpowder loaded in the expansion tube explosive rope while ensuring the smooth separation of the separation device, and reduces the high-frequency vibration impact transmitted to the structure during the operation of the separation device from the impact source.

[0019] In addition, the device includes a separation plate, a protective cover and a connection limit plate. Compared with existing separation devices of the same type, this device can achieve single-sided separation and is applicable to a wider range of separation task scenarios.

[0020] It should be noted that the single-sided separation low-impact expansion pipeline pyrotechnic separation device provided in this application only separates one side. Compared with other linear pyrotechnic separation devices where the explosion impact directly acts on the separation plate, the separation plate is only destroyed through the expansion tube. No excess explosion products are generated during the separation process, thereby improving the safety of the separation action.

[0021] Moreover, compared with the two-side separation form of existing separation devices of the same type, only a single-side separation plate is required, which requires less space on the non-separation side, effectively reducing the overall weight of the separation device and achieving a higher level of equipment lightweighting.

[0022] Furthermore, compared with the two-sided separation form of existing separation devices of the same type, only a single-sided separation plate is required. The acceleration impact response frequency domain peak generated by the expansion tube on the separation plate is lower, and the interference to the electronic devices inside the aircraft is lower, further improving the safety of related equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic structural diagram of a low-impact expansion pipeline-type pyrotechnic separation device with single-side separation proposed in an embodiment of the present application; Figure 2 This is a schematic structural diagram of the separation plate, separation plane and key dimensions of a low-impact expansion pipeline-type pyrotechnic separation device with single-side separation proposed in an embodiment of the present application; Figure 3 This is a structural diagram of a separation plate, weakening groove and key dimensions of a low-impact expansion pipeline-type pyrotechnic separation device with single-side separation proposed in an embodiment of the present application; Figure 4 This is a schematic diagram showing the key dimensions of the protective cover of a low-impact expansion pipeline-type pyrotechnic separation device with single-side separation and its structure in a separation plane view; Among them, 1-separation plate, 2-protection cover, 3-flat tube, 4-filler, 5-explosive rope, 6-connection limit plate, 7-bolt. DETAILED DESCRIPTION

[0024] In the following description, specific details such as specific system structures and techniques are provided for purposes of illustration, not limitation, to facilitate a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known pyrotechnic separation techniques and pyrotechnic separation equipment are omitted to avoid obscuring the description of the present application with unnecessary detail.

[0025] The terms used in the following embodiments are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the specification and appended claims of this application, the singular expressions "a," "said," "above," and "the" are intended to also include expressions such as "one or more," unless the context clearly indicates otherwise.

[0026] 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 avoid being damaged by debris generated during the launch mission, and avoid damage to the equipment caused by excessive vibration and impact loads.

[0027] The pyrotechnic separation device has unique advantages for the separation tasks of some aerospace structures due to its fast response, low delay and high synchronization. The gunpowder in the expansion tube separation device indirectly acts 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, and is widely used.

[0028] Accordingly, the pyrotechnic separation device, as a key part of the spacecraft to achieve tasks such as inter-stage separation and ultimately ensure the smooth completion of the launch mission, has been systematically studied. According to the actuation mode, pyrotechnic separation is mainly divided into two categories: point explosion separation device and linear explosion separation device.

[0029] In related technologies, point-type release devices are limited in their application scenarios due to assembly strength limitations. They often require a large number of release devices to operate simultaneously, placing extremely high demands on the synchronization of pyrotechnic devices and resulting in limited reliability. However, linear release devices offer high load capacity, rapid response, short operating times, and high synchronization, while also generating lower impact loads during operation than other types of linear release devices.

[0030] However, the expansion pipeline type pyrotechnic separation device is often separated on both sides, with a complex structure, heavy weight, and still a large impact. It is easy to generate debris during the separation process, which affects the instruments and equipment. The reliability requirements of the separation device are high. The separation plate close to the side of the rocket body is easy to fly into the interior of the rocket during the separation process, which is also not conducive to the safety of the equipment and devices inside the rocket body.

[0031] Therefore, an embodiment of the present application provides a single-sided separated low-impact expansion pipeline-type pyrotechnic separation device, in which the separation plate is connected to the connecting limit plate and the "J"-shaped protective cover by fasteners, and a charging groove is provided at the center position of the protective cover, and a weakening groove is provided on the separation plate. The protective cover is located above the separation plate, and the vertical axis of the charging groove of the protective cover coincides with the axis of the weakening groove of the separation plate.

[0032] Furthermore, the explosive cord is located at the center of the flat tube, with a filler positioned between the explosive cord and the flat tube. The flat tube, filler, and explosive together form an expansion tube, which is positioned within the charge slot of the protective cover. The expansion tube has a cross-section with parallel upper and lower sides connected by a semicircular border, and the cross-section is perpendicular to the axis of the flat tube.

[0033] An embodiment of the present application provides a single-side separated low-impact expansion pipeline-type pyrotechnic separation device. According to the relationship between the degree of structural damage caused by the explosion impact and the material failure criterion, an upper limit of the thickness dimension of the structure damaged by the expansion work of the expansion tube is established, and the design upper limit of the weakening groove of the separation plate and the design lower limit of the protective thickness of the protective cover can be determined at the same time.

[0034] Moreover, the separation plate is 2.5 meters away from the center of the weakening groove. The thickness is reduced to size , which can further improve the lightweight level of the separation device.

[0035] In addition, the weakening groove of the trapezoidal structure, which has an arc-shaped short side and a trapezoidal-shaped structure, reduces the amount of gunpowder loaded in the expansion tube explosive rope while ensuring the smooth separation of the separation device, and reduces the high-frequency vibration impact transmitted to the structure during the operation of the separation device from the impact source.

[0036] In addition, the device includes a separation plate, a protective cover and a connection limit plate. Compared with existing separation devices of the same type, this device can achieve single-sided separation and is applicable to a wider range of separation task scenarios.

[0037] It should be noted that the single-sided separation low-impact expansion pipeline pyrotechnic separation device provided in this application only separates one side. Compared with other linear pyrotechnic separation devices where the explosion impact directly acts on the separation plate, the separation plate is only destroyed through the expansion tube. No excess explosion products are generated during the separation process, thereby improving the safety of the separation action.

[0038] Moreover, compared with the two-side separation form of existing separation devices of the same type, only a single-side separation plate is required, which requires less space on the non-separation side, effectively reducing the overall weight of the separation device and achieving a higher level of equipment lightweighting.

[0039] Furthermore, compared with the two-sided separation form of existing separation devices of the same type, only a single-sided separation plate is required. The acceleration impact response frequency domain peak generated by the expansion tube on the separation plate is lower, and the interference to the electronic devices inside the aircraft is lower, further improving the safety of related equipment.

[0040] See also Figure 1 , Figure 1This is a schematic structural diagram of a low-impact expansion pipeline type pyrotechnic separation device with unilateral separation proposed in an embodiment of the present application. The low-impact expansion pipeline type pyrotechnic separation device described in the present application includes: a separation plate 1, a protective cover 2, a flat tube 3, a filler 4, an explosive cord 5, and a connecting limit plate 6.

[0041] Among them, the protective cover 2 is in a "U" shape and can be connected to the separation plate 1 through fasteners. Similarly, the limiting side of the connecting limit plate 6 can also be connected to the separation plate 1 through fasteners.

[0042] Moreover, a charge groove can be provided at the center position of the protective cover 2, a weakened groove is opened on the separation plate 1, the protective cover 2 can be located above the separation plate 1, and the vertical axis of the charge groove of the protective cover 2 can coincide with the axis of the weakened groove of the separation plate 1.

[0043] In addition, the explosive cord 5 can be located at the center position inside the flat tube 3, and a filler 4 is installed between the explosive cord 5 and the flat tube 3. The flat tube 3, the filler 4, and the explosive cord 5 together form an expansion tube. Correspondingly, the expansion tube can be placed in the charge groove of the protective cover 2.

[0044] Furthermore, as Figure 1 shown, the upper and lower sides of the cross-section of the expansion tube are in a parallel structure, and the upper and lower sides are connected by a semi-circular boundary, and the cross-section is perpendicular to the axis of the flat tube.

[0045] For example, referring to Figure 1 , the overall structural form of the expansion tube can be that the left and right ends are in a semi-circular structure, and the middle is a rectangular structure, and the short side of the rectangle is connected to the semi-circular structure. Among them, the long side of the rectangular structure can be 14.1 millimeters (mm), and it can be designed according to the diameter ratio of the rectangular structure to the semi-circular structure of 2:1, and the semi-circular diameter is obtained as 7.2 mm.

[0046] Correspondingly, according to the structural characteristics of the expansion tube, the cross-sectional radius corresponding to the charge amount of the central circular explosive cord 5 of the expansion tube is designed can be 0.6 mm, that is, the cross-sectional radius of the explosive cord 5 is 1 / 6 of the semi-circular radius of the expansion tube, less than 0.3 times the semi-circular radius of the expansion tube. Among them, this cross-sectional area size can correspond to a detonating cord of cyclonite with a standard bulk density of 1.6 grams per cubic centimeter (g / cm³).

[0047] Moreover, as Figure 2As shown, the surface of the separation plate 1 provided with the weakening groove is the first surface, and the surface of the separation plate 1 in contact with the protective cover 2 is the second surface. In order to ensure that a smaller charge of the explosive cord 5 is used as much as possible to reduce the high-frequency vibration generated by the explosion impact, while ensuring that the connection strength of the separation plate 1 has a certain margin, the thickness between the bottom of the weakening groove and the second surface can be designed.

[0048] For example, Figure 2 As shown, the thickness between the bottom of the weakened groove and the second surface It can be 2.3mm, and the distance between the first surface and the second surface, that is, the thickness of the separation plane The separation plane is the cross section of the separation plate.

[0049] Accordingly, according to the determined separation plane thickness The height from the bottom of the designed weakening groove to the first surface is the groove depth The closer to the upper limit, the more conducive to the lightweight design of the structure, but at the same time it will reduce the bearing capacity of the structure. In order to ensure that the bearing capacity of the separation plate 1 has a certain margin, the weight of the separation plate 1 can be reduced as much as possible to improve the lightweight level of the separation device. It is 3.6mm to meet the corresponding design requirements.

[0050] For example, the distance between the bottom of the weakened groove and the first surface is the groove depth , the distance from the first surface to the second surface is the thickness of the separation plane , separation plane thickness and groove depth Need to meet: .

[0051] Accordingly, the thickness between the bottom of the weakened groove and the second surface may be greater than or equal to a preset thickness threshold and less than a preset upper limit, wherein the upper limit may be determined based on the cross-sectional radius corresponding to the charge of the explosive cord.

[0052] For example, the thickness between the bottom of the groove and the second surface is weakened Can satisfy: in, Based on the relationship between the degree of structural damage caused by explosion impact and the material failure criterion, the upper limit of the thickness of the structure damaged by the expansion work of the expansion tube is established.

[0053] Accordingly, It can be expressed as: in, The cross-sectional radius corresponding to the charge amount of the circular explosive cord 5 at the center of the expansion tube.

[0054] Or, for ease of calculation, It can be expressed as: Accordingly, substitute , calculated .

[0055] In addition, in order to ensure that the separation device can smoothly realize the separation action, the tensile stress of the groove is weakened under the action of the detonation wave, thereby reducing the charge amount of the explosive cord 5 required in the separation process.

[0056] Moreover, the weakening groove may be a trapezoidal structure, and the short side of the weakening groove may be an arc-shaped structure, and the arc-shaped structure is tangent to the waist of the trapezoidal structure.

[0057] For example, the shape of the weakening groove can be set to trapezoidal, and the groove depth can be designed to be =3.6mm, which is the height of the trapezoid. The long side of the weakening groove is located on the first surface. The groove bottom is set as an arc structure with the short side of the trapezoid as the diameter. The arc structure can be tangent to the trapezoid busbar.

[0058] Furthermore, if Figure 3 As shown, to ensure that the angle between the trapezoidal busbar and the inner side of the long side is ≤80 degrees (°), the size of the long side Need to meet , for example, the size of the long side can be designed 4.2mm, short side The size is 1.1mm.

[0059] Furthermore, in order to reduce the weight of the non-separation portion of the separation plate 1, the thickness of the separation plate 1 outside the 10.5 mm distance from the center of the weakening groove can be reduced. For example, the thickness of this area can be designed to be It can be 4mm.

[0060] In addition, if Figure 2 As shown, in order to eliminate the stress concentration at the thickness change of the separation plane, a chamfer can be set at the thickness reduction point of the separation plane for transition. Among them, the thickness reduction point can be 2.5 from the separation plane to the center of the weakening groove. Moreover, the degree of the chamfer ranges from 100 degrees to 160 degrees.

[0061] For example, Figure 2 As shown, the thickness change of the separation plane is a chamfered corner at the thickness intersection of the separation plate 1 10.5 mm away from the center of the weakening groove. The degree can be 150 degrees.

[0062] In an alternative embodiment, Figure 4 As shown, the assembly groove of the protective cover 2 can be set according to the shape of the expansion tube. The inner side of the assembly groove can be rectangular, and the inner side size can match the gap of the expansion tube, and the matching gap is less than 1mm.

[0063] It should be noted that the thickness of the protective cover 2 on the upper and lower sides of the expansion tube is , can be greater than the upper limit of the thickness of the structure destroyed when the expansion tube expands and works , while the thickness of the rest of the expansion tube is No less than .

[0064] For example, you can design 7mm, the thickness of other parts To ensure assembly strength, it can be designed to be 5mm.

[0065] In another optional embodiment, the non-assembly side of the protective cover 2 can be a limiting side, and an extension section can be provided on the limiting side of the protective cover 2, so that limiting can be achieved at the junction of the limiting structure connecting the limiting plate 6 through the extension section.

[0066] For example, the thickness of the extension section of the limiting side can be the same as the thickness of the assembly part of the protective cover 2. Furthermore, the thickness of the limiting structure connected to the limiting plate 6 and the plate thickness can both be 5 mm.

[0067] Furthermore, all structural transitions of the protective cover 2 and the connecting limit plate 6 are provided with rounded corners 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.

[0068] Accordingly, during the operation of a low-impact expansion pipeline-type pyrotechnic separation device with single-side separation provided in the present application example, through experiments and finite element simulation, it can smoothly operate according to the following process: When the explosive cord 5 at the center of the flat tube 3 is detonated, the expansion of the filler 4 pushes the flat tube 3 outward, and 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 restraining action of the connecting limit plate 6, the flat tube 3 expands toward 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.

[0069] To sum up, the example of this application provides a single-sided separated low-impact expansion pipeline-type pyrotechnic separation device, in which the separation plate is connected to the connecting limit plate and the "J"-shaped protective cover by fasteners, and a charging groove is provided at the center position 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 charging groove of the protective cover coincides with the axis of the weakening groove of the separation plate, which can meet the high load-bearing capacity, rapid response, short working time and high synchronization requirements required by the project.

[0070] Furthermore, the explosive cord is located at the center of the flat tube, with a filler positioned between the explosive cord and the flat tube. The flat tube, filler, and explosive together form an expansion tube, which is positioned within the charge slot of the protective cover. The expansion tube has a cross-section with parallel upper and lower sides connected by a semicircular border, and the cross-section is perpendicular to the axis of the flat tube.

[0071] An embodiment of the present application provides a single-side separated low-impact expansion pipeline-type pyrotechnic separation device. According to the relationship between the degree of structural damage caused by the explosion impact and the material failure criterion, an upper limit of the thickness dimension of the structure damaged by the expansion work of the expansion tube is established, and the design upper limit of the weakening groove of the separation plate and the design lower limit of the protective thickness of the protective cover can be determined at the same time.

[0072] Moreover, the separation plate is 2.5 meters away from the center of the weakening groove. The thickness is reduced to size , which can further improve the lightweight level of the separation device.

[0073] In addition, the weakening groove of the trapezoidal structure, which has an arc-shaped short side and a trapezoidal-shaped structure, reduces the amount of gunpowder loaded in the expansion tube explosive rope while ensuring the smooth separation of the separation device, and reduces the high-frequency vibration impact transmitted to the structure during the operation of the separation device from the impact source.

[0074] In addition, the device includes a separation plate, a protective cover and a connection limit plate. Compared with existing separation devices of the same type, this device can achieve single-sided separation and is applicable to a wider range of separation task scenarios.

[0075] It should be noted that the single-sided separation low-impact expansion pipeline pyrotechnic separation device provided in this application only separates one side. Compared with other linear pyrotechnic separation devices where the explosion impact directly acts on the separation plate, the separation plate is only destroyed through the expansion tube. No excess explosion products are generated during the separation process, thereby improving the safety of the separation action.

[0076] Moreover, compared with the two-side separation form of existing separation devices of the same type, only a single-side separation plate is required, which requires less space on the non-separation side, effectively reducing the overall weight of the separation device and achieving a higher level of equipment lightweighting.

[0077] Furthermore, compared with the two-sided separation form of existing separation devices of the same type, only a single-sided separation plate is required. The acceleration impact response frequency domain peak generated by the expansion tube on the separation plate is lower, and the interference to the electronic devices inside the aircraft is lower, further improving the safety of related equipment.

[0078] In addition, compared with existing separation devices of the same type, it can achieve single-sided separation, and no extra explosion products are generated during the separation process. At the same time, only a single-sided separation plate 1 is required, and the space requirement on the non-separation side is lower, which effectively reduces the overall weight of the separation device. The frequency domain peak of the acceleration impact response generated during the actuation process is lower than the case where the detonation wave directly acts on the structure. It has the advantages of wide applicability, high safety, light weight and low impact.

[0079] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0080] Those skilled in the art will appreciate that the units and algorithm steps of each example 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 performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel 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.

[0081] In the embodiments provided in this application, it should be understood that the disclosed devices / equipment and methods can be implemented in other ways. For example, the device / equipment embodiments described above are merely schematic. For example, the division of the modules or units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0082] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or collections thereof.

[0083] It will also be understood that the term "and / or" used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0084] As used in this specification and the appended claims, the term "if" can be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "upon determination" or "in response to determining" or "upon detection of [described condition or event]" or "in response to detecting [described condition or event]," depending on the context.

[0085] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0086] References to "one embodiment" or "some embodiments" in this specification mean that a particular feature, structure, or characteristic described in conjunction with that embodiment is included in one or more embodiments of the present application. Thus, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in other embodiments" appearing in various places in 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 "including," "comprising," "having," and variations thereof all mean "including but not limited to," unless otherwise specifically emphasized.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A low-impact expansion pipeline type pyrotechnic separation device with single-side separation, characterized in that: The device includes: a separation plate, a protective cover, a flat tube, a filler, an explosive cord, and a connecting limit plate; The protective cover is in a "U" shape and is connected to the separation plate through fasteners. The limiting side of the connecting limit plate is connected to the separation plate through the fasteners; A charging groove is provided at the center position 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 charging groove of the protective cover coincides with the axis of the weakening groove of the separation plate; The explosive cord is located at the inner center position of the flat tube. 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, and the expansion tube is placed in the charging 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.

2. The device according to claim 1, wherein The surface of the separation plate provided 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.

3. The device according to claim 2, wherein The distance between the bottom of the weakened groove and the first surface is the groove depth , the distance from the first surface to the second surface is the thickness of the separation plane , the separation plane thickness With the groove depth Need to meet: 。 4. The device according to claim 3, characterized in that A chamfer is provided at the thickness reduction portion of the separation plane for transition, and the thickness reduction portion is 2.5 mm from the separation plane to the center of the weakening groove. The chamfer angle is in the range of 100 to 160 degrees, and the long side of the weakening groove is .

5. The device according to claim 1, wherein The surface of the separation plate provided with the weakening groove is the first surface, the surface of the separation plate in contact with the protective cover is the second surface, and the distance from the first surface to the second surface is the thickness of the separation plane. ; The separation plate is 2.5 meters away from the center of the weakening groove The thickness at the weakening groove is reduced, and the size of the long side of the weakening groove is , the thickness after reduction Need to meet: 。 6. The device according to claim 1, wherein The thickness of the protective cover on the upper and lower sides of the expansion tube , which is greater than the upper limit of the thickness of the structure destroyed when the expansion tube expands and works , the thickness of the protective cover assembly part No less than .

7. The device according to claim 1, wherein At all structural turning points of the protective cover and the connecting limit 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.

8. The device according to claim 1, wherein 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.

9. The device according to claim 8, wherein The long side of the weakening groove is located on the first surface of the separation 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 degrees, and the size of the long side of the weakening groove is less than or equal to 80 degrees. satisfy: The distance between the bottom of the weakened groove and the first surface is the groove depth. .

10. The device according to claim 8, wherein The chord length corresponding to the arc structure of the weakening groove satisfy: and Wherein, the size of the long side of the weakening groove is The thickness between the bottom of the weakened groove and the second surface of the separation plate is .

Images