Flexible heat shield adapted to telescoping deformation member

Abstract

The application provides a flexible heat shield suitable for telescopic deformation members, which comprises: flexible heatproof layers in sheet shape; two side edges of the flexible heatproof layers are arranged around corresponding telescopic shafts, and the two side edges are connected with each other by adhesive tape; the outer side of the flexible heatproof layer is bound by a strap and positioned on the corresponding telescopic shaft; the flexible heatproof layer corresponding to a thinner telescopic shaft extends to the outer wall of a thicker telescopic shaft, and the thicker flexible heatproof layer is sleeved on the thinner flexible heatproof layer; the overlapping areas between the flexible heatproof layers can slide with each other; a support framework is accommodated in the flexible heatproof layer and is arranged in a circumferential interval around the telescopic shafts, and the interval angle is not greater than 180 degrees; the support framework supports the flexible heatproof layer to keep extending along the axial direction of the telescopic shafts. The application can not only adapt to the radial telescoping of auxiliary legs, but also meet the large gas flow working condition test faced by the launch vehicle during return, and can also meet the effect of convenient disassembly and easy maintenance.

Description

Technical Field

[0001] This invention belongs to the field of thermal protection technology, specifically, it relates to a flexible heat shield adapted to a telescopic and deformable component. Background Technology

[0002] With the rapid development of aerospace technology, reusable rockets have become an important development direction in the aerospace field. During ascent and reentry, the surface temperature of a spacecraft rises sharply due to aerodynamic and combustion heat. To ensure the structural and functional integrity of components during flight, thermal protection is necessary.

[0003] Currently, the thermal protection materials used in launch vehicle products are mainly resin-based thermal protection materials such as organosilicon and epoxy resin. Due to the limitations of their material properties and construction processes, these types of thermal protection materials do not meet the requirements for thermal protection of deformable areas, especially the protection of the telescopic auxiliary legs of reusable launch vehicles.

[0004] Patent document CN211307683U discloses a multilayer thermal protection material, belonging to the field of high-temperature thermal protection and structural design. This thermal protection material consists of four layers, from the outside in: an inorganic fiber mat, a glass fiber cloth, a heat sink layer, and a low thermal conductivity layer, and can be used for high-temperature protection of structures.

[0005] However, the protective material in patent document CN211307683U is limited by the movement of the rocket's telescopic auxiliary legs. During the extension and retraction of the telescopic shaft, the protective material will bend and stack, and cannot cooperate with the extension and retraction movement of the telescopic shaft.

[0006] To accommodate the radial extension and retraction of the auxiliary legs, meet the high-gas flow conditions encountered during rocket reentry, and ensure easy disassembly and maintenance, this invention designs a flexible heat shield adapted to the telescopic deformation of the components, thus solving the aforementioned problems. Summary of the Invention

[0007] To address the shortcomings of existing technologies, the purpose of this invention is to provide a flexible heat shield adapted to telescopic deformation components.

[0008] A flexible heat shield adapted to a telescopic deformation member according to the present invention includes: a support frame, a flexible heat shield layer, adhesive straps, and cable ties; The flexible heat-insulating layer is sheet-like; The flexible heat-insulating layer is wrapped around the corresponding telescopic shaft on both sides, and the two sides are connected to each other by adhesive tape; The flexible heat-insulating layer is secured to the corresponding telescopic shaft by cable ties on its outer side. The flexible heat-insulating layer corresponding to the thinner telescopic shaft extends to the outer wall of the thicker telescopic shaft, and the thicker flexible heat-insulating layer is fitted over the thinner flexible heat-insulating layer. The overlapping areas between the flexible heat-insulating layers can slide against each other; The support frame is housed in a flexible heat-insulating layer and is spaced circumferentially around the telescopic axis, with an interval angle not exceeding 180 degrees. The supporting frame supports the flexible heat-insulating layer to maintain its axial extension along the telescopic axis.

[0009] Preferably, the flexible heat-resistant layer includes a heat-resistant outer layer and a heat-insulating core layer, with the heat-resistant outer layer stitched to both sides of the heat-insulating core layer, and the supporting skeleton stitched to and housed within the heat-insulating core layer.

[0010] Preferably, the adhesive tape is sewn onto the side edge of the flexible heat-insulating layer, and the tapes are bonded to each other.

[0011] Preferably, the suture used for the stitching connection is made of at least one of glass fiber suture, high silica fiber suture, quartz fiber suture, and aramid suture.

[0012] Preferably, the heat-resistant outer layer is made of at least one of glass fiber cloth, high silica fiber cloth, quartz fiber cloth, alumina fiber cloth, and aluminum silicate fiber cloth.

[0013] Preferably, the heat insulation core layer is made of at least one of polyimide foam, polyurethane foam, aramid fiber felt, alumina fiber felt, mullite fiber felt, and quartz fiber felt.

[0014] Preferably, the tape material is one of nylon, polyphenylene sulfide, high-silica, or quartz.

[0015] Preferably, the cable tie material is one of stainless steel, nickel-chromium alloy, or galvanized steel.

[0016] Preferably, the support frame is arranged at uniform intervals around the telescopic axis, and the support frame material is one of aluminum alloy, stainless steel, titanium alloy, polyvinyl chloride, polyphenylene sulfide, polyetheretherketone, and polyimide.

[0017] Preferably, the sliding length of the overlapping area between the flexible heat-insulating layers is greater than the maximum telescopic length between the telescopic shafts, and a cable tie is provided on the outer side of the overlapping area between the flexible heat-insulating layers to limit the radial dimension of the flexible heat-insulating layers.

[0018] Compared with the prior art, the present invention has the following beneficial effects: 1. Existing thermal protection materials do not meet the thermal protection requirements of deformable areas of aircraft components. This invention provides a reusable, easy-to-maintain, lightweight, and highly efficient thermal protection solution that adapts to expansion and contraction deformation.

[0019] 2. The present invention has low thermal conductivity, which can ensure the structural and functional integrity of the components during flight and meet the test of large gas flow conditions (greater than 100kW / m2) faced by the launch vehicle during return.

[0020] 3. This invention is easy to construct and adaptable to the expansion and contraction deformation of aircraft components, meets the requirements of easy maintenance and can be applied to the telescopic auxiliary legs of reusable rockets. Attached Figure Description

[0021] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the structure of the flexible heat-resistant layer of the present invention.

[0022] Figure 2 This is a schematic diagram of the unfolded flexible heat-resistant layer of the present invention.

[0023] Figure 3 This is a schematic diagram of the structure of the flexible heat-resistant layer of the present invention.

[0024] Figure 4 This is a view of the flexible heat-resistant layer of the present invention under a quartz lamp.

[0025] Figure 5 This is a physical image of the flexible heat-resistant layer of the present invention.

[0026] The diagram shows: 1. Support frame; 2. Flexible heat-resistant layer; 21. Heat-resistant outer layer; 22. Heat-insulating core layer; 3. Adhesive tape; 4. Cable tie. Detailed Implementation

[0027] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0028] like Figures 1-5 As shown, a flexible heat shield adapted to a telescopic deformation component is used for thermal protection of the telescopic shaft of a reusable rocket, including a support frame 1, a flexible heat shield layer 2, a strap 3, and a cable tie 4.

[0029] The flexible heat-insulating layer 2 is sheet-like and has multiple segments corresponding to the telescopic shaft; The flexible heat-insulating layer 2 has its two sides wrapped around the corresponding telescopic shaft, and the two sides are connected to each other by the tape 3.

[0030] The tape is made of one of the following materials: nylon, polyphenylene sulfide, high silica, or quartz. The tape 3 is sewn to the side edge of the flexible heat-insulating layer 2, and the tapes 3 are bonded to each other, thus maintaining the cylindrical shape sleeved on the outside of the telescopic shaft.

[0031] The suture used for the suture connection is made of at least one of the following: glass fiber suture, high silica fiber suture, quartz fiber suture, and aramid suture.

[0032] The flexible heat-insulating layer 2 is bound and positioned to the corresponding telescopic shaft by cable ties 4 on the outside to maintain protection for each telescopic shaft.

[0033] Preferably, a cable tie 4 may be provided on the outer side of the overlapping area between the flexible heat-insulating layers 2 to limit the radial dimension of the flexible heat-insulating layer 2 and ensure the stability of the extension direction of the flexible heat-insulating layer.

[0034] Cable tie 4 is made of one of the following materials: stainless steel, nickel-chromium alloy, or galvanized steel.

[0035] The flexible heat-insulating layer 2 corresponding to the thinner telescopic shaft extends to the outer wall of the thicker telescopic shaft. The thicker flexible heat-insulating layer 2 is fitted over the thinner flexible heat-insulating layer 2, thereby protecting the connection between the telescopic shafts. The overlapping areas between the flexible heat-insulating layers 2 can slide against each other, and the sliding length of the overlapping part is greater than the maximum extension length between the extension shafts, so as to avoid the flexible heat-insulating layers 2 from separating from each other and causing misalignment.

[0036] The support frame 1 is housed in the flexible heat-insulating layer 2 and is evenly arranged around the telescopic axis with an interval angle not exceeding 180 degrees. The support frame 1 supports the flexible heat-insulating layer 2 and keeps it extending along the telescopic axis, ensuring that the heat-insulating cover can extend and expand normally along the axis during the telescopic process of the telescopic component, without stacking.

[0037] The supporting frame 1 is made of one of the following materials: aluminum alloy, stainless steel, titanium alloy, polyvinyl chloride, polyphenylene sulfide, polyether ether ketone, or polyimide.

[0038] The flexible heat-resistant layer 2 includes a heat-resistant outer layer 21 and a heat-insulating core layer 22. The heat-resistant outer layer 21 is stitched to both sides of the heat-insulating core layer 22, and the supporting frame 1 is stitched to and housed in the heat-insulating core layer 22.

[0039] The heat-resistant outer layer 21 is made of one or more of the following: glass fiber cloth, high silica fiber cloth, quartz fiber cloth, alumina fiber cloth, and aluminum silicate fiber cloth, which are laminated together. The areal density, thickness, and number of layers of the fiber cloth are determined according to the thermal environment faced by the material.

[0040] The heat insulation core layer 22 is composed of one or more of the following: polyimide foam, polyurethane foam, aramid fiber felt, alumina fiber felt, mullite fiber felt, and quartz fiber felt. The thickness of the heat insulation core is determined according to the thermal environment faced by the material. The heat-resistant outer layer 21 and the heat insulation core layer 22 are joined together by stitching.

[0041] In this embodiment, the heat-resistant outer layer 21 is made of quartz fiber cloth, with two pieces, each 1600mm long, 860mm wide, and 0.25mm thick.

[0042] The heat insulation core layer 22 is made of alumina heat insulation felt, with a quantity of 2 pieces, each 1600mm long, 860mm wide, and 2mm thick.

[0043] The supporting frame 1 is a PVC board, 300mm long, 10mm wide, and 1mm thick, with a quantity of 3 pieces, which are sewn into the inner layer of the heat insulation core.

[0044] Tape 3 is a nylon tape, 50mm long and 20mm wide, and there are 5 of them.

[0045] Cable tie 4 is made of 304 stainless steel, the stitching is made of quartz thread, and the stitch spacing is 5mm.

[0046] By stitching the heat-resistant outer layer 21 and the heat-insulating core layer 22 together with quartz thread, a heat shield with a surface density ≤1.0kg / m² and a room temperature thermal conductivity ≤0.1W / m・k can be obtained.

[0047] After the heat shield is manufactured, it is tested and evaluated by static heating under a quartz lamp.

[0048] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0049] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A flexible heat shield adapted to a telescopic deformation component, characterized in that, include: Support frame (1), flexible heat-insulating layer (2), adhesive tape (3) and cable ties (4); The flexible heat-insulating layer (2) is sheet-like; The flexible heat-insulating layer (2) has two sides wrapped around the corresponding telescopic shaft, and the two sides are connected to each other by the tape (3); The flexible heat-insulating layer (2) is bound and positioned to the corresponding telescopic shaft by cable ties (4) on the outside; The flexible heat-insulating layer (2) corresponding to the thin telescopic shaft extends to the outer wall of the thick telescopic shaft, and the flexible heat-insulating layer (2) corresponding to the thick telescopic shaft is sleeved on the flexible heat-insulating layer (2) corresponding to the thin telescopic shaft. The overlapping area between the two flexible heat-insulating layers (2) can slide against each other; The support frame (1) is housed in the flexible heat-insulating layer (2) and is spaced around the telescopic axis at intervals of no more than 180 degrees. The supporting frame (1) supports the flexible heat-insulating layer (2) and maintains axial extension along the telescopic axis; The flexible heat-resistant layer (2) includes a heat-resistant outer layer (21) and a heat-insulating core layer (22). The heat-resistant outer layer (21) is stitched to both sides of the heat-insulating core layer (22), and the supporting frame (1) is stitched to and accommodated in the heat-insulating core layer (22).

2. The flexible heat shield adapted to a telescopic deformation component according to claim 1, characterized in that, The adhesive tape (3) is sewn to the side edge of the flexible heat-insulating layer (2), and the adhesive tapes (3) are bonded to each other.

3. The flexible heat shield adapted to a telescopic deformation component according to claim 2, characterized in that, The suture used for the suture connection is made of at least one of glass fiber suture, high silica fiber suture, quartz fiber suture, and aramid suture.

4. The flexible heat shield adapted to a telescopic deformation member according to claim 1, characterized in that, The heat-resistant outer layer (21) is made of at least one of glass fiber cloth, high silica fiber cloth, quartz fiber cloth, alumina fiber cloth, and aluminum silicate fiber cloth.

5. The flexible heat shield adapted to a telescopic deformation member according to claim 1, characterized in that, The heat insulation core layer (22) is made of at least one of polyimide foam, polyurethane foam, aramid fiber felt, alumina fiber felt, mullite fiber felt, and quartz fiber felt.

6. The flexible heat shield adapted to a telescopic deformation member according to claim 1, characterized in that, The material of the tape (3) is one of nylon, polyphenylene sulfide, high silica, or quartz.

7. The flexible heat shield adapted to a telescopic deformation component according to claim 1, characterized in that, The cable tie (4) is made of one of the following materials: stainless steel, nickel-chromium alloy, or galvanized steel.

8. The flexible heat shield adapted to a telescopic deformation member according to claim 1, characterized in that, The support frame (1) is arranged at uniform intervals around the telescopic axis. The material of the support frame (1) is one of aluminum alloy, stainless steel, titanium alloy, polyvinyl chloride, polyphenylene sulfide, polyether ether ketone, and polyimide.

9. The flexible heat shield adapted to a telescopic deformation member according to claim 1, characterized in that, The sliding length of the overlapping area between the flexible heat-insulating layers (2) is greater than the maximum telescopic length between the telescopic shafts, and a cable tie (4) is provided on the outer side of the overlapping area between the flexible heat-insulating layers (2) to limit its radial dimension.

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