A camera multilayer thermal insulation assembly heat shield for satellites and a method for mounting the same

Abstract

This invention discloses a multi-layer thermal insulation component heat shield for satellite cameras and its installation method. The multi-layer thermal insulation component heat shield consists of two layers of aramid wire frames and a multi-layer thermal insulation component. The mesh structure formed by the aramid wire frames on both sides supports the multi-layer thermal insulation component sandwiched in the middle. The multi-layer thermal insulation component heat shield is fixed to the structural plate of the payload compartment floor using aramid wires and nylon bases. During installation, firstly, 10 units of multi-layer thermal insulation components are fabricated; then, the binding points of the lower aramid wires are selected on the structural plate, the lower aramid wire frames are arranged, and after the lateral tension of the aramid wires meets the requirements, adhesive is applied at the binding points to prevent loosening; the multi-layer thermal insulation component is laid, and the lower aramid wires are sewn together with the multi-layer thermal insulation component; next, the binding points of the upper aramid wires are selected on the structural plate, the upper aramid wire frames are arranged, and after the lateral tension of the aramid wires meets the requirements, adhesive is applied at the binding points to prevent loosening; finally, the upper aramid wires are sewn together with the multi-layer thermal insulation component.

Description

Technical Field

[0001] This application relates to the technical field of satellite cameras, and in particular to a multi-layer heat insulation component heat shield for satellite cameras and its installation method. Background Technology

[0002] Multi-layer thermal insulation components and thermal control materials are widely used in the development of various spacecraft structural panels and equipment to ensure the normal operation of satellites and their equipment in the complex and harsh space thermal environment. This ensures temperature control of onboard instruments, structural components, and internal and external cabin components, guaranteeing that the onboard temperature meets the satellite's thermal control design requirements. For cameras, multi-layer thermal insulation components and thermal control materials are generally installed on the outer surface of the camera body to ensure reasonable camera temperature control and meet the camera's operating requirements in the space thermal environment. Typically, cameras are mounted on the payload bay floor. The fabricated multi-layer thermal insulation components and thermal control materials are securely attached to the camera body and structural panel using Velcro and GD414 vulcanized silicone rubber on the outer surface of the camera or the surface of the structural panel at the camera's mounting location. However, traditional installation methods are only suitable for installations where the multi-layer thermal insulation components and thermal control materials are bonded to the structural surface or camera body surface, i.e., situations where the multi-layer thermal insulation components and thermal control materials can be directly glued or fixed to the metal structural surface. When the camera is installed above the load-bearing cylinder or in a location with a large through hole in the load chamber floor, the thermal control insulation material of the multi-layer thermal insulation component cannot be directly attached and fixed to the structure. However, in order to prevent heat backflow, it is still necessary to suspend the thermal control insulation material of the multi-layer thermal insulation component in the location of the large through hole. Summary of the Invention

[0003] This application provides a heat shield for a multi-layer thermal insulation component of a satellite camera and its installation method. In the application scenario of this solution, the large-payload camera is installed above the through-hole on the bottom plate of the entire satellite payload compartment, and the thermal control insulation material of the camera's multi-layer thermal insulation component needs to be suspended in the air. This invention uses a suspended installation method at the upper end of the load-bearing cylinder and the middle opening of the payload compartment bottom plate to install the thermal control insulation material of the camera's multi-layer thermal insulation component, i.e., the heat shield of the camera's multi-layer thermal insulation component, and fixes it firmly to ensure that it will not fall off during vibration testing and satellite launch.

[0004] In one aspect, a heat shield for a satellite camera multilayer heat shield is provided, comprising a lower aramid wire frame, a multilayer heat shield, and an upper aramid wire frame; the mesh structure composed of the lower and upper aramid wire frames supports the multilayer heat shield sandwiched in the middle; and the heat shield of the multilayer heat shield is fixed to the satellite structure using a nylon base.

[0005] In conjunction with the first aspect, in some implementations of the first aspect, the lower aramid thread frame includes 6 lower aramid threads and 6 lower binding points;

[0006] The six lower-layer aramid yarns are the first lower-layer aramid yarn, the second lower-layer aramid yarn, the third lower-layer aramid yarn, the fourth lower-layer aramid yarn, the fifth lower-layer aramid yarn, and the sixth lower-layer aramid yarn;

[0007] Six lower binding points are evenly distributed around the outer periphery of the lower aramid wire frame, and in a clockwise direction they are the first lower binding point, the second lower binding point, the third lower binding point, the fourth lower binding point, the fifth lower binding point, and the sixth lower binding point;

[0008] The upper aramid yarn frame includes 6 upper aramid yarns and 6 upper binding points;

[0009] The six upper aramid threads are designated as the first upper aramid thread, the second upper aramid thread, the third upper aramid thread, the fourth upper aramid thread, the fifth upper aramid thread, and the sixth upper aramid thread. The first upper aramid thread is aligned with the first lower aramid thread, the second upper aramid thread is aligned with the second lower aramid thread, and the third upper aramid thread is aligned with the third lower aramid thread.

[0010] Six upper-layer binding points are evenly distributed around the outer periphery of the upper-layer aramid yarn frame, and are designated as the first upper-layer binding point, second upper-layer binding point, third upper-layer binding point, fourth upper-layer binding point, fifth upper-layer binding point, and sixth upper-layer binding point in a clockwise direction. The first upper-layer binding point is aligned with the first lower-layer binding point, the second upper-layer binding point is aligned with the second lower-layer binding point, the third upper-layer binding point is aligned with the third lower-layer binding point, the fourth upper-layer binding point is aligned with the fourth lower-layer binding point, the fifth upper-layer binding point is aligned with the fifth lower-layer binding point, and the sixth upper-layer binding point is aligned with the sixth lower-layer binding point.

[0011] In conjunction with the first aspect, in some implementations of the first aspect, one end of the first lower aramid thread is fixed to the first lower binding point, and the other end of the first lower aramid thread is fixed to the fourth lower binding point; one end of the second lower aramid thread is fixed to the second lower binding point, and the other end of the second lower aramid thread is fixed to the fifth lower binding point; one end of the third lower aramid thread is fixed to the third lower binding point, and the other end of the third lower aramid thread is fixed to the sixth lower binding point; one end of the fourth lower aramid thread is fixed to the second lower binding point, and the other end of the fourth lower aramid thread is fixed to the sixth lower binding point; one end of the fifth lower aramid thread is fixed to the fourth lower binding point, and the other end of the fifth lower aramid thread is fixed to the sixth lower binding point; one end of the sixth lower aramid thread is fixed to the second lower binding point, and the other end of the sixth lower aramid thread is fixed to the fourth lower binding point.

[0012] One end of the first upper aramid yarn is fixed to the first upper binding point, and the other end of the first upper aramid yarn is fixed to the fourth upper binding point; one end of the second upper aramid yarn is fixed to the second upper binding point, and the other end of the second upper aramid yarn is fixed to the fifth upper binding point; one end of the third upper aramid yarn is fixed to the third upper binding point, and the other end of the third upper aramid yarn is fixed to the sixth upper binding point; one end of the fourth upper aramid yarn is fixed to the first upper binding point, and the other end of the fourth upper aramid yarn is fixed to the third upper binding point; one end of the fifth upper aramid yarn is fixed to the first upper binding point, and the other end of the fifth upper aramid yarn is fixed to the fifth upper binding point; one end of the sixth upper aramid yarn is fixed to the third upper binding point, and the other end of the sixth upper aramid yarn is fixed to the fifth upper binding point.

[0013] In conjunction with the first aspect, in some implementations of the first aspect, at the lower layer intersection point ① where the first lower layer aramid thread and the second lower layer aramid thread intersect, the first lower layer aramid thread and the second lower layer aramid thread are sewn together with the multilayer thermal insulation component; at the lower layer intersection point ② where the second lower layer aramid thread and the third lower layer aramid thread intersect, the second lower layer aramid thread and the third lower layer aramid thread are sewn together with the multilayer thermal insulation component; at the lower layer intersection point ③ where the third lower layer aramid thread and the first lower layer aramid thread intersect, the third lower layer aramid thread and the first lower layer aramid thread are sewn together with the multilayer thermal insulation component. The layers of thermal insulation components are sewn together; at the lower layer intersection point ④ where the first and fourth lower layer aramid threads intersect, the first and fourth lower layer aramid threads are sewn together with the multilayer thermal insulation components; at the lower layer intersection point ⑤ where the second and fifth lower layer aramid threads intersect, the second and fifth lower layer aramid threads are sewn together with the multilayer thermal insulation components; at the lower layer intersection point ⑥ where the third and sixth lower layer aramid threads intersect, the third and sixth lower layer aramid threads are sewn together with the multilayer thermal insulation components.

[0014] At the upper intersection point (1) where the first and second upper aramid threads intersect, the first and second upper aramid threads are sewn together with the multilayer thermal insulation component; the first upper intersection point (1) is aligned with the first lower intersection point (1); at the upper intersection point (2) where the second and third upper aramid threads intersect, the second and third upper aramid threads are sewn together with the multilayer thermal insulation component; the second upper intersection point (2) is aligned with the second lower intersection point (2); at the upper intersection point (3) where the third and first upper aramid threads intersect, the third and first upper aramid threads are sewn together with the multilayer thermal insulation component. The thermal insulation components are sewn together; the third upper layer intersection point (3) and the third lower layer intersection point (3) are aligned; at the upper layer intersection point (4) where the first upper layer aramid thread and the fourth upper layer aramid thread intersect, the first upper layer aramid thread and the fourth upper layer aramid thread are sewn together with the multilayer thermal insulation component; at the upper layer intersection point (5) where the second upper layer aramid thread and the fifth upper layer aramid thread intersect, the second upper layer aramid thread and the fifth upper layer aramid thread are sewn together with the multilayer thermal insulation component; at the upper layer intersection point (6) where the third upper layer aramid thread and the sixth upper layer aramid thread intersect, the third upper layer aramid thread and the sixth upper layer aramid thread are sewn together with the multilayer thermal insulation component.

[0015] In conjunction with the first aspect, in some implementations of the first aspect, the multi-layer thermal insulation component includes an outer membrane, an inner membrane, and 10 layers of multi-layer thermal insulation component core material; except for the outer membrane and the inner membrane, each layer of multi-layer thermal insulation component core material includes a 6µm double-sided aluminized polyester perforated film and a polyester mesh, and both the outer membrane and the inner membrane are double-sided aluminized polyester films with a thickness of 18-25µm; the membrane is fixed to the inner and outer surfaces of the core material with double-sided tape, and reinforced with silicone rubber at appropriate intervals; the membrane size is 30-40mm larger on each side than the multi-layer thermal insulation component size, and the flanges are firmly fixed with double-sided tape; a grounding device is provided on the multi-layer thermal insulation component for grounding connection after the multi-layer thermal insulation component is installed; nylon fasteners are pasted on each edge of the multi-layer thermal insulation component, and are fixedly installed with corresponding nylon fasteners on the structural plate of the load compartment floor.

[0016] In a second aspect, a method for installing a multi-layer heat insulation component heat shield for a satellite camera is provided. The method is used to install the multi-layer heat insulation component heat shield as described in any of the implementations of the first aspect above. The method includes a method for installing a lower aramid wire frame, a method for laying the multi-layer heat insulation component, and a method for installing an upper aramid wire frame.

[0017] In conjunction with the second aspect, in some implementations of the second aspect, the installation method of the lower aramid wire frame includes:

[0018] Six lower binding points are evenly selected on the outer structural plate of the upper surface of the load chamber bottom plate, and one nylon base is installed at each lower binding point.

[0019] To secure the aramid thread in the lower aramid thread frame: tie a knot at the nylon base lug at the starting end, pull the aramid thread to the other end, wrap it around the nylon base lug at the other end, and fold it back in the original direction.

[0020] The tension of the lower aramid threads is tested. If the test is passed, glue is applied to the binding points of the 6 lower aramid threads and the corresponding nylon bases to prevent loosening and secure them firmly.

[0021] In conjunction with the second aspect, in some implementations of the second aspect, the quantitative evaluation methods for the straightening state of aramid yarns include:

[0022] Using a digital tensioner, tighten the aramid thread with a force of 15-20N to achieve the appropriate tension; then mark the aramid thread and the nylon base lugs with a marker.

[0023] Release the tensioner, wrap the aramid thread around the nylon base loop three more times, align the markings on the rope with the nylon base loop when fastening the knot, then tie it together with the original thread and secure it with a knot.

[0024] In conjunction with the second aspect, in some implementations of the second aspect, the tension test of the lower aramid thread is to measure the lateral tension. A point is taken from the center of each aramid thread, and a tension gauge is used to pull it parallel by a displacement d. The tension value T displayed on the tension gauge is observed and recorded. 拉力 satisfy:

[0025]

[0026] F 张力 denoted as the preset tension force when the aramid thread is under tension, L is the length of the aramid thread after tension, and d is the pulling length after applying a tension force perpendicular to the tension direction of the aramid thread at the center using a tension gauge.

[0027] In conjunction with the second aspect, in some implementations of the second aspect, any two aramid threads in the lower aramid thread frame intersect to form a lower layer intersection point; in the multi-layer thermal insulation component laying method, each lower layer intersection point is fixed with single-sided aluminized polyester tape in an order from the inside out, and then the aramid threads at the lower layer intersection point are sewn together with the multi-layer thermal insulation component by making a cross with stainless steel wire.

[0028] In the upper aramid wire frame, any two aramid wires intersect to form an upper cross point; in the installation method of the upper aramid wire frame, each upper cross point is fixed with single-sided aluminized polyester tape in the order from the inside to the outside, and then the aramid wires at the upper cross points are sewn together with the multi-layer heat insulation component by making a cross with stainless steel wire.

[0029] Compared with the prior art, the solution provided in this application has at least the following beneficial technical effects:

[0030] (1) The present invention provides a method for manufacturing and suspending the heat insulation screen of a multi-layer heat insulation component for a camera device, which solves the problem of installing multi-layer heat insulation components when there is no fixed mounting surface.

[0031] (2) After the aramid thread is fixed at both ends, it is generally impossible to measure the longitudinal tension. This invention provides a method for measuring and verifying the tension of aramid thread. By converting it to measuring the transverse tension, the corresponding longitudinal tension during binding can be calculated, thereby determining whether the longitudinal tension meets the requirements and whether the aramid thread is properly tensioned.

[0032] (3) The upper and lower two-layer aramid wire frame is used to fix the middle multi-layer heat insulation components firmly. The fixing points are more flexible than the previous multi-layer heat insulation components. The fixing point positions can be flexibly adjusted according to different structural layouts, reducing the installation difficulty. Attached Figure Description

[0033] Figure 1 This is a structural diagram for the installation of the lower aramid fiber frame.

[0034] Figure 2 This is a structural diagram of the upper aramid fiber frame installation.

[0035] Figure 3 A diagram showing the tensile strength analysis of aramid yarn. Detailed Implementation

[0036] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0037] Combination Figure 1 and Figure 2 This invention provides a heat shield for a multi-layer heat insulation component for satellite cameras, comprising a lower aramid fiber frame, a multi-layer heat insulation component, and an upper aramid fiber frame. The mesh structure formed by the lower and upper aramid fiber frames supports the multi-layer heat insulation component sandwiched in the middle. A nylon base can be used to fix the heat shield of the multi-layer heat insulation component to the satellite structure.

[0038] In some embodiments, the multilayer thermal insulation assembly is a 10-unit multilayer thermal insulation assembly, including an outer membrane, an inner membrane, and 10 layers of multilayer thermal insulation core material. Except for the outer and inner membranes, each unit includes a 6µm double-sided aluminized polyester perforated film and a polyester mesh. Both the outer and inner membranes are 18-25µm thick double-sided aluminized polyester films. The membrane is fixed to the inner and outer surfaces of the core material using double-sided tape and reinforced with silicone rubber at appropriate intervals. The membrane size is 30-40mm larger on each side than the multilayer thermal insulation assembly size, and the edges are securely fixed with double-sided tape. A grounding device is provided on the multilayer thermal insulation assembly for grounding connection after installation. The grounding device is, for example, a grounding wire with lugs, riveted to the multilayer thermal insulation assembly. Meanwhile, Velcro fasteners (loops) are attached to each edge of the multi-layer thermal insulation component, and Velcro fasteners (hooks) are attached to the corresponding positions on the outer structural plate of the upper surface of the load chamber floor, for the fixed installation of the multi-layer thermal insulation component of the thermal insulation screen.

[0039] Figure 1 A schematic diagram of a lower aramid yarn frame is shown. The lower aramid yarn frame includes six lower aramid yarns and six lower binding points. The six lower aramid yarns are designated as first lower aramid yarn 1, second lower aramid yarn 2, third lower aramid yarn 3, fourth lower aramid yarn 6, fifth lower aramid yarn 7, and sixth lower aramid yarn 8. The six lower binding points are evenly distributed circumferentially around the outer periphery of the lower aramid yarn frame, and are designated as first lower binding point, second lower binding point, third lower binding point, fourth lower binding point, fifth lower binding point, and sixth lower binding point in a clockwise direction.

[0040] One end of the first lower layer aramid thread 1 is fixed to the first lower layer binding point, and the other end of the first lower layer aramid thread 1 is fixed to the fourth lower layer binding point. One end of the second lower layer aramid thread 2 is fixed to the second lower layer binding point, and the other end of the second lower layer aramid thread 2 is fixed to the fifth lower layer binding point. One end of the third lower layer aramid thread 3 is fixed to the third lower layer binding point, and the other end of the third lower layer aramid thread 3 is fixed to the sixth lower layer binding point. One end of the fourth lower layer aramid thread 6 is fixed to the second lower layer binding point, and the other end of the fourth lower layer aramid thread 6 is fixed to the sixth lower layer binding point. One end of the fifth lower layer aramid thread 7 is fixed to the fourth lower layer binding point, and the other end of the fifth lower layer aramid thread 7 is fixed to the sixth lower layer binding point. One end of the sixth lower layer aramid thread 8 is fixed to the second lower layer binding point, and the other end of the sixth lower layer aramid thread 8 is fixed to the fourth lower layer binding point.

[0041] At the lower layer intersection point ① where the first lower layer aramid thread 1 and the second lower layer aramid thread 2 intersect, the first lower layer aramid thread 1 and the second lower layer aramid thread 2 are sewn together with the multilayer thermal insulation component. At the lower layer intersection point ② where the second lower layer aramid thread 2 and the third lower layer aramid thread 3 intersect, the second lower layer aramid thread 2 and the third lower layer aramid thread 3 are sewn together with the multilayer thermal insulation component. At the lower layer intersection point ③ where the third lower layer aramid thread 3 and the first lower layer aramid thread 1 intersect, the third lower layer aramid thread 3 and the first lower layer aramid thread 1 are sewn together with the multilayer thermal insulation component. At the lower layer intersection point ④ where the first lower layer aramid thread 1 and the fourth lower layer aramid thread 6 intersect, the first lower layer aramid thread 1 and the fourth lower layer aramid thread 6 are sewn together with the multilayer thermal insulation component. At the lower layer intersection point ⑤ where the second lower layer aramid thread 2 and the fifth lower layer aramid thread 7 intersect, the second lower layer aramid thread 2 and the fifth lower layer aramid thread 7 are sewn together with the multilayer thermal insulation component. At the lower layer intersection point ⑥ where the third lower layer aramid thread 3 and the sixth lower layer aramid thread 8 intersect, the third lower layer aramid thread 3 and the sixth lower layer aramid thread 8 are sewn together with the multilayer thermal insulation component.

[0042] Figure 2 A schematic diagram of an upper aramid yarn frame is shown. The upper aramid yarn frame includes six upper aramid yarns and six upper binding points. The six upper aramid yarns are designated as first upper aramid yarn 11, second upper aramid yarn 12, third upper aramid yarn 13, fourth upper aramid yarn 16, fifth upper aramid yarn 17, and sixth upper aramid yarn 18. The six upper binding points are evenly distributed circumferentially around the outer periphery of the upper aramid yarn frame, and are designated as first upper binding point, second upper binding point, third upper binding point, fourth upper binding point, fifth upper binding point, and sixth upper binding point in a clockwise direction. The first upper binding point is aligned with the aforementioned first lower binding point; the second upper binding point is aligned with the aforementioned second lower binding point; the third upper binding point is aligned with the aforementioned third lower binding point; the fourth upper binding point is aligned with the aforementioned fourth lower binding point; the fifth upper binding point is aligned with the aforementioned fifth lower binding point; and the sixth upper binding point is aligned with the aforementioned sixth lower binding point.

[0043] One end of the first upper aramid thread 11 is fixed to the first upper binding point, and the other end of the first upper aramid thread 11 is fixed to the fourth upper binding point. One end of the second upper aramid thread 12 is fixed to the second upper binding point, and the other end of the second upper aramid thread 12 is fixed to the fifth upper binding point. One end of the third upper aramid thread 13 is fixed to the third upper binding point, and the other end of the third upper aramid thread 13 is fixed to the sixth upper binding point. Therefore, the first upper aramid thread 11 can be aligned with the aforementioned first lower aramid thread 1, the second upper aramid thread 12 can be aligned with the aforementioned second lower aramid thread 2, and the third upper aramid thread 13 can be aligned with the aforementioned third lower aramid thread 3. One end of the fourth upper aramid thread 16 is fixed to the first upper binding point, and the other end of the fourth upper aramid thread 16 is fixed to the third upper binding point. One end of the fifth upper aramid thread 17 is fixed to the first upper binding point, and the other end of the fifth upper aramid thread 17 is fixed to the fifth upper binding point. One end of the sixth upper aramid thread 18 is fixed to the third upper binding point, and the other end of the sixth upper aramid thread 18 is fixed to the fifth upper binding point.

[0044] At the upper intersection point (1) where the first upper aramid thread 11 and the second upper aramid thread 12 intersect, the first upper aramid thread 11 and the second upper aramid thread 12 are sewn together with the multilayer thermal insulation component. The first upper intersection point (1) can be aligned with the aforementioned first lower intersection point ①. At the upper intersection point (2) where the second upper aramid thread 12 and the third upper aramid thread 13 intersect, the second upper aramid thread 12 and the third upper aramid thread 13 are sewn together with the multilayer thermal insulation component. The second upper intersection point (2) can be aligned with the aforementioned second lower intersection point ②. At the upper intersection point (3) where the third upper aramid thread 13 and the first upper aramid thread 11 intersect, the third upper aramid thread 13 and the first upper aramid thread 11 are sewn together with the multilayer thermal insulation component. The third upper intersection point (3) can be aligned with the aforementioned third lower intersection point ③. At the upper intersection point (4) where the first upper aramid thread 11 and the fourth upper aramid thread 16 intersect, the first upper aramid thread 11 and the fourth upper aramid thread 16 are sewn together with the multilayer thermal insulation component. At the upper intersection point (5) where the second upper aramid thread 12 and the fifth upper aramid thread 17 intersect, the second upper aramid thread 12 and the fifth upper aramid thread 17 are sewn together with the multilayer thermal insulation component. At the upper intersection point (6) where the third upper aramid thread 13 and the sixth upper aramid thread 18 intersect, the third upper aramid thread 13 and the sixth upper aramid thread 18 are sewn together with the multilayer thermal insulation component.

[0045] The present invention also provides a method for installing a heat insulation screen of a multi-layer heat insulation component for a satellite camera, including a method for installing a lower aramid wire frame, a method for laying the multi-layer heat insulation component, and a method for installing an upper aramid wire frame.

[0046] In the installation method of the lower aramid fiber frame, the lower aramid fiber frame needs to be installed on the load chamber floor plate. The load chamber floor plate is a hexagonal structure with a central opening. The camera is installed above the load chamber floor plate, and the multi-layer thermal insulation component's heat shield completely covers the central opening of the load chamber floor plate. The installation method of the lower aramid fiber frame includes the following steps.

[0047] Step 101: On the outer structural plate of the upper surface of the load chamber bottom plate, select 6 aramid thread binding points evenly (corresponding to the above 6 lower binding points), and install 1 nylon base at each aramid thread binding point.

[0048] In one embodiment, the distance between the two opposite aramid thread binding points is approximately 1200 mm.

[0049] In one embodiment, the nylon base is secured with screws and prevented from loosening with anti-loosening adhesive.

[0050] Step 102, according to Figure 1 The lower aramid fiber frame is arranged in a shape.

[0051] When fixing, each aramid thread is fixed as follows: tie a knot at the nylon base corner at the starting end, pull the aramid thread to the other end, wrap it around the nylon base corner at the other end, and fold it back in the original direction.

[0052] To quantitatively assess the straightening state of the aramid threads, a digital tensioner was used to tighten them with a force of 15-20N until the tension was moderate. Then, marks were made on the aramid threads and the loops of the nylon base with a marker (the marks on the cord and the loops of the nylon base should be aligned when fastening the knot later). The tensioner was released, and the aramid threads were wrapped around the loops of the nylon base three more times, aligning with the marks, and then tied together with the original direction of the thread, securing it with a knot. All six aramid threads were secured using the above method. A preliminary check of the tension was performed visually and by gently pulling with the fingers (the threads were now taut).

[0053] Step 103: Test the tension of the lower aramid yarn. If the test is passed, apply 502 glue to the binding points of the 6 lower aramid yarns and the corresponding nylon base ears to prevent loosening and secure them firmly.

[0054] At this point, both ends of the aramid thread are fixed, making it impossible to measure the longitudinal tensile force. To verify that even with proper tension after installation, a quantitative standard for tensile force can still be established, the measurement is changed to transverse tensile force. Specifically, after fixing, a point is taken at the center of each aramid thread, and a tension gauge is used to pull it parallel to the ground at a displacement of d = 10 mm (measured with a steel ruler). The tensile force value displayed on the tension gauge is observed and recorded. Based on the following theoretical conversion method...

[0055] like Figure 3 As shown, assume that the tension force of a certain aramid thread under tension is F. 张力The length of the tension is L. A tension gauge is used to apply a tension force perpendicular to the tension direction of the aramid thread at the center of the aramid thread and pull it by a length d. At this time, the reading of the tension gauge is T. 拉力 At this point, the aramid thread is pulled at an angle of θ. Based on the force balance at the pulling point, we can conclude that:

[0056]

[0057] When the aramid thread is connected to two opposing nylon bases, the tension length is L = 1200 mm. If the tension of the aramid thread...

[0058] Therefore, after the aramid thread is tightened and fixed with a force of 15-20N, and then stretched laterally for a length d=10mm, if the tension value displayed on the tension gauge is 0.5-0.66N, it proves that the aramid thread is appropriately tight and meets the requirements.

[0059] The method for laying multi-layer thermal insulation components may include: placing the fabricated multi-layer thermal insulation component on the lower aramid wire frame composed of 6 aramid wires, from the inside out (according to...). Figure 1 (Following the sequence from intersections ①, ②, and ③ to intersections ④, ⑤, and ⑥), at each intersection, use stainless steel wire to make a cross stitch to sew the aramid thread to the multi-layer insulation component. Secure the edges of the multi-layer insulation component to the outer structural plate of the upper surface of the load cell floor using single-sided aluminized polyester tape.

[0060] The installation method for the upper aramid fiber frame is similar to that for the lower aramid fiber frame. In the upper aramid fiber frame installation method, according to... Figure 2 The upper aramid thread frame is arranged in a shape with a total of 6 aramid threads (corresponding to the 6 upper aramid threads mentioned above). It is fixed according to the installation method of the lower aramid thread frame. Visually inspect and gently pull with your fingers to initially check the tension (the threads are taut). Then, the tension of the upper aramid threads is tested. The method for testing the tension of the upper aramid threads is similar to that of the lower aramid threads. To test the tension, the lateral stretching length d = 10mm should show a tension value of 0.5-0.66N on the tension gauge. This indicates that the aramid threads are appropriately tensioned and meet the requirements. Then, apply 502 glue to the binding points of the 6 upper aramid threads and the corresponding nylon base corners to secure them firmly. Afterwards, fix the multi-layer thermal insulation component to the upper aramid thread frame. The method for fixing the multi-layer thermal insulation component and the upper aramid thread frame is as follows: on the upper aramid thread mesh composed of 6 aramid threads, from the inside out (according to...) Figure 2 (Following the sequence from the intersections of points (1), (2), and (3) to the intersections of points (4), (5), and (6),) at each intersection, use stainless steel wire to make a cross-shaped stitch to sew the aramid thread to the multi-layer insulation component. At the contact points between the aramid thread and the multi-layer insulation component, reinforce with single-sided aluminized polyester tape at intervals (to better bond the aramid thread to the multi-layer insulation component and make it a unified whole).

[0061] This invention provides a method for the suspended installation of thermal insulation materials in multi-layer thermal insulation components. This solves the problem of thermal control functionality when equipment is installed above a load-bearing cylinder or in a location with large through-holes in the payload compartment floor, where the thermal insulation materials of the multi-layer thermal insulation components cannot be directly fixed to the equipment or structure. This method can be used for the suspended installation of thermal insulation materials in multi-layer thermal insulation components for all satellite equipment, structural panels, and mechanisms, thereby meeting the thermal control requirements of the equipment and structure. Furthermore, it ensures that the materials will not detach after vibration testing and satellite launch.

[0062] Example 1

[0063] The procedure for installing the heat shield of the multi-layer heat insulation component for small satellite cameras is as follows:

[0064] 1) Fabrication of Multi-Layer Insulation Components: Fabricate 10-unit multi-layer insulation components according to the design dimensions. Each 10-unit component consists of an outer membrane, an inner membrane, and 10 layers of core material. Each inner unit comprises a 6µm double-sided aluminized polyester perforated film and a polyester mesh. Both the outer and inner membranes are 18-25µm thick double-sided aluminized polyester films. The membrane is fixed to the inner and outer surfaces of the core material using double-sided tape and reinforced with silicone rubber at appropriate intervals. The membrane size is 30-40mm larger on each side than the core material, and the edges are securely fixed with double-sided tape. A grounding device is installed on the multi-layer insulation component, connected to a grounding wire for connection to the structure after installation. Nylon Velcro fasteners (loops) are sewn onto each edge of the multi-layer insulation component.

[0065] 2) Use silicone rubber to attach Velcro (hooks) at the corresponding positions on the structural panel to fix the edges of the multi-layer thermal insulation components at the edge of the structure after the installation of the thermal insulation screen.

[0066] 3) Select six aramid thread binding points symmetrically on the structural plate, with an approximate distance of 1200mm between any two opposite binding points. Install six nylon bases at the selected locations, and secure the screws with MS anti-loosening adhesive.

[0067] 4) Based on the straight-line distance between each binding point, leave an extra 30mm on both sides, and use double-stranded wires, for a total of 12 wires, or 24 strands.

[0068] 5) According to the appendix Figure 2The shape requires the arrangement of the lower aramid thread frame, with a total of 6 aramid threads (aramid thread 1, aramid thread 2, aramid thread 3, aramid thread 6, aramid thread 7, and aramid thread 8). When fixing, each aramid thread is fixed as follows: tie a knot at the nylon base lug at the starting end, pull the aramid thread to the other end, wrap it once around the nylon base lug at the other end, and fold it back in the original direction. To quantitatively assess the straightness of the aramid thread, use a digital tensioner to tighten it with a force of 15-20N, allowing the aramid thread to reach a suitable tension. Then, mark the aramid thread and the nylon base lug with a marker (align the marks on the rope with the nylon base lug when tying the knot later). Release the tensioner, continue wrapping the aramid thread around the nylon base lug 3 times, aligning it with the marks, and then tie it together with the thread in the original direction, securing it with a knot, as shown in the attached diagram. Figure 3 As shown, all six aramid threads were fixed using the method described above. Visually inspect and gently tug with your fingers to check the tension (the threads are now taut).

[0069] 6) Measure the transverse tensile force of the lower aramid thread: After the aramid thread is fixed, take a point from the center of each aramid thread, and use a tension gauge to pull it out by 10mm (measured with a steel ruler). Observe and record the transverse tensile force value displayed on the tension gauge. The reading is about 0.5-0.66N, which is considered qualified.

[0070] 7) Apply 502 glue to the binding points of the aramid thread and the nylon base to prevent loosening.

[0071] 8) Laying the multi-layer thermal insulation assembly: Place the prepared multi-layer thermal insulation assembly on the lower aramid wire mesh composed of 6 aramid wires, from the inside out (see attached...). Figure 1 From the intersections of points ①, ②, and ③ to points ④, ⑤, and ⑥, secure each intersection with a layer of single-sided aluminized polyester tape. Then, use stainless steel wire to stitch the aramid thread to the multi-layer insulation component in a cross pattern, as shown in the attached diagram. Figure 1 As shown, after sewing, cover the stainless steel wire head with a layer of single-sided aluminum-plated polyester tape to avoid excess material.

[0072] 9) Secure the inner edge of the multi-layer thermal insulation component to the edge of the structural plate using Velcro, then apply GD414 silicone rubber for further fixation, and finally seal the outer edge with single-sided aluminized polyester tape.

[0073] 10) Using the same method as in step 5), follow the appendix. Figure 2 The shape is arranged with an upper aramid wire frame, a total of 6 wires (aramid wire 11, aramid wire 12, aramid wire 13, aramid wire 16, aramid wire 17, aramid wire 18).

[0074] 11) Using the same method as in step 6), measure the transverse tensile force of the upper aramid yarn. A reading of approximately 0.5-0.66 N is considered acceptable.

[0075] 12) Apply 502 glue to the binding points of the aramid thread and the nylon base to prevent loosening.

[0076] 13) On the upper aramid yarn frame composed of 6 aramid yarns, from the inside out (attached) Figure 2 From the intersection of points (1), (2), and (3) to the intersection of points (4), (5), and (6), fix each intersection with a layer of single-sided aluminized polyester tape. Then, use stainless steel wire to make a cross stitch to sew the aramid thread to the multi-layer thermal insulation component together. After sewing, cover the end of the stainless steel wire with another layer of single-sided aluminized polyester tape to avoid excess material.

[0077] 14) At the contact points between the aramid thread and the multi-layer thermal insulation component, reinforce with single-sided aluminized polyester tape at intervals to ensure better adhesion and integration between the aramid thread and the multi-layer thermal insulation component. The final installation of the multi-layer thermal insulation component for the small satellite camera should look like the attached image. Figure 1 As shown.

[0078] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope defined in the claims of the present invention.

Claims

1. A multi-layer heat insulation component heat shield for satellite cameras, characterized in that, It includes a lower aramid fiber frame, a multi-layer thermal insulation component, and an upper aramid fiber frame; the mesh structure composed of the lower and upper aramid fiber frames supports the multi-layer thermal insulation component sandwiched in the middle; the multi-layer thermal insulation component is fixed to the star structure using a nylon base. The lower aramid thread frame includes 6 lower aramid threads and 6 lower binding points; The six lower aramid threads are the first lower aramid thread (1), the second lower aramid thread (2), the third lower aramid thread (3), the fourth lower aramid thread (6), the fifth lower aramid thread (7), and the sixth lower aramid thread (8). Six lower binding points are evenly distributed around the outer periphery of the lower aramid wire frame, and in a clockwise direction they are the first lower binding point, the second lower binding point, the third lower binding point, the fourth lower binding point, the fifth lower binding point, and the sixth lower binding point; The upper aramid yarn frame includes 6 upper aramid yarns and 6 upper binding points; The six upper aramid threads are the first upper aramid thread (11), the second upper aramid thread (12), the third upper aramid thread (13), the fourth upper aramid thread (16), the fifth upper aramid thread (17), and the sixth upper aramid thread (18); the first upper aramid thread (11) is aligned with the first lower aramid thread (1), the second upper aramid thread (12) is aligned with the second lower aramid thread (2), and the third upper aramid thread (13) is aligned with the third lower aramid thread (3); Six upper-layer binding points are evenly distributed around the outer periphery of the upper-layer aramid yarn frame, and are designated as the first upper-layer binding point, second upper-layer binding point, third upper-layer binding point, fourth upper-layer binding point, fifth upper-layer binding point, and sixth upper-layer binding point in a clockwise direction. The first upper-layer binding point is aligned with the first lower-layer binding point, the second upper-layer binding point is aligned with the second lower-layer binding point, the third upper-layer binding point is aligned with the third lower-layer binding point, the fourth upper-layer binding point is aligned with the fourth lower-layer binding point, the fifth upper-layer binding point is aligned with the fifth lower-layer binding point, and the sixth upper-layer binding point is aligned with the sixth lower-layer binding point.

2. The multi-layer thermal insulation component thermal insulation screen according to claim 1, characterized in that, One end of the first lower layer aramid thread (1) is fixed at the first lower layer binding point, and the other end of the first lower layer aramid thread (1) is fixed at the fourth lower layer binding point; one end of the second lower layer aramid thread (2) is fixed at the second lower layer binding point, and the other end of the second lower layer aramid thread (2) is fixed at the fifth lower layer binding point; one end of the third lower layer aramid thread (3) is fixed at the third lower layer binding point, and the other end of the third lower layer aramid thread (3) is fixed at the sixth lower layer binding point; one end of the fourth lower layer aramid thread (6) is fixed at the second lower layer binding point, and the other end of the fourth lower layer aramid thread (6) is fixed at the sixth lower layer binding point; one end of the fifth lower layer aramid thread (7) is fixed at the fourth lower layer binding point, and the other end of the fifth lower layer aramid thread (7) is fixed at the sixth lower layer binding point; one end of the sixth lower layer aramid thread (8) is fixed at the second lower layer binding point, and the other end of the sixth lower layer aramid thread (8) is fixed at the fourth lower layer binding point; One end of the first upper aramid thread (11) is fixed at the first upper binding point, and the other end of the first upper aramid thread (11) is fixed at the fourth upper binding point; one end of the second upper aramid thread (12) is fixed at the second upper binding point, and the other end of the second upper aramid thread (12) is fixed at the fifth upper binding point; one end of the third upper aramid thread (13) is fixed at the third upper binding point, and the other end of the third upper aramid thread (13) is fixed at the sixth upper binding point; One end of the fourth upper aramid thread (16) is fixed at the first upper binding point, and the other end of the fourth upper aramid thread (16) is fixed at the third upper binding point; one end of the fifth upper aramid thread (17) is fixed at the first upper binding point, and the other end of the fifth upper aramid thread (17) is fixed at the fifth upper binding point; one end of the sixth upper aramid thread (18) is fixed at the third upper binding point, and the other end of the sixth upper aramid thread (18) is fixed at the fifth upper binding point.

3. The multi-layer thermal insulation component thermal insulation screen according to claim 2, characterized in that, At the lower layer intersection point ① where the first lower layer aramid thread (1) and the second lower layer aramid thread (2) intersect, the first lower layer aramid thread (1) and the second lower layer aramid thread (2) are sewn together with the multilayer thermal insulation component; at the lower layer intersection point ② where the second lower layer aramid thread (2) and the third lower layer aramid thread (3) intersect, the second lower layer aramid thread (2) and the third lower layer aramid thread (3) are sewn together with the multilayer thermal insulation component; at the lower layer intersection point ③ where the third lower layer aramid thread (3) and the first lower layer aramid thread (1) intersect, the third lower layer aramid thread (3) and the first lower layer aramid thread (1) are sewn together with the multilayer thermal insulation component; At the lower layer intersection point ④ where the first lower layer aramid thread (1) and the fourth lower layer aramid thread (6) intersect, the first lower layer aramid thread (1) and the fourth lower layer aramid thread (6) are sewn together with the multilayer thermal insulation component; at the lower layer intersection point ⑤ where the second lower layer aramid thread (2) and the fifth lower layer aramid thread (7) intersect, the second lower layer aramid thread (2) and the fifth lower layer aramid thread (7) are sewn together with the multilayer thermal insulation component; at the lower layer intersection point ⑥ where the third lower layer aramid thread (3) and the sixth lower layer aramid thread (8) intersect, the third lower layer aramid thread (3) and the sixth lower layer aramid thread (8) are sewn together with the multilayer thermal insulation component; At the upper intersection point (1) where the first upper aramid thread (11) and the second upper aramid thread (12) intersect, the first upper aramid thread (11) and the second upper aramid thread (12) are sewn together with the multilayer thermal insulation component; the first upper intersection point (1) is aligned with the first lower intersection point ①; at the upper intersection point (2) where the second upper aramid thread (12) and the third upper aramid thread (13) intersect, the second upper aramid thread (12) and the third upper aramid thread (13) are sewn together with the multilayer thermal insulation component; the second upper intersection point (2) is aligned with the second lower intersection point ②; at the upper intersection point (3) where the third upper aramid thread (13) and the first upper aramid thread (11) intersect, the third upper aramid thread (13) and the first upper aramid thread (11) are sewn together with the multilayer thermal insulation component. The multilayer thermal insulation components are sewn together; the third upper layer intersection point (3) and the third lower layer intersection point (3) are aligned; at the upper layer intersection point (4) where the first upper layer aramid thread (11) and the fourth upper layer aramid thread (16) intersect, the first upper layer aramid thread (11) and the fourth upper layer aramid thread (16) are sewn together with the multilayer thermal insulation components; at the upper layer intersection point (5) where the second upper layer aramid thread (12) and the fifth upper layer aramid thread (17) intersect, the second upper layer aramid thread (12) and the fifth upper layer aramid thread (17) are sewn together with the multilayer thermal insulation components; at the upper layer intersection point (6) where the third upper layer aramid thread (13) and the sixth upper layer aramid thread (18) intersect, the third upper layer aramid thread (13) and the sixth upper layer aramid thread (18) are sewn together with the multilayer thermal insulation components.

4. The multi-layer thermal insulation component thermal insulation screen according to any one of claims 1 to 3, characterized in that, The multi-layer thermal insulation component includes an outer membrane, an inner membrane, and a core material of 10 layers. Except for the outer and inner membranes, each core material consists of a 6µm double-sided aluminized polyester perforated film and a polyester mesh. Both the outer and inner membranes are double-sided aluminized polyester films with a thickness of 18-25µm. The membrane is fixed to the inner and outer surfaces of the core material using double-sided tape and reinforced with silicone rubber at appropriate intervals. The membrane size is 30-40mm larger on each side than the multi-layer thermal insulation component, and the edges are securely fixed with double-sided tape. A grounding device is installed on the multi-layer thermal insulation component for grounding connection after installation. Nylon fasteners are attached to each edge of the multi-layer thermal insulation component and fixedly installed with corresponding fasteners on the structural plate of the load compartment floor.

5. A method for installing a heat shield of a multi-layer heat insulation component for a satellite camera, characterized in that, The installation method is used to install a multi-layer thermal insulation component heat insulation screen as described in any one of claims 1 to 4. The installation method includes an installation method for the lower aramid wire frame, a multi-layer thermal insulation component laying method, and an installation method for the upper aramid wire frame.

6. The installation method according to claim 5, characterized in that, The installation method for the lower aramid fiber frame includes: Six lower binding points are evenly selected on the outer structural plate of the upper surface of the load chamber bottom plate, and one nylon base is installed at each lower binding point. To secure the aramid thread in the lower aramid thread frame: tie a knot at the nylon base lug at the starting end, pull the aramid thread to the other end, wrap it around the nylon base lug at the other end, and fold it back in the original direction. The tension of the lower aramid threads is tested. If the test is passed, glue is applied to the binding points of the 6 lower aramid threads and the corresponding nylon bases to prevent loosening and secure them firmly.

7. The installation method according to claim 5, characterized in that, Quantitative evaluation methods for the straightening state of aramid yarns include: Using a digital tensioner, tighten the aramid thread with a force of 15-20N to achieve the appropriate tension; then mark the aramid thread and the nylon base lugs with a marker. Release the tensioner, wrap the aramid thread around the nylon base loop three more times, align the markings on the rope with the nylon base loop when fastening the knot, then tie it together with the original thread and secure it with a knot.

8. The installation method according to claim 5, characterized in that, The tension test for the lower layer of aramid yarns is performed by measuring the lateral tensile force. A point is taken at the center of each aramid yarn, and a tension gauge is used to pull the yarn parallel to the surface. Displacement, observe and record the tension value displayed on the tension gauge. satisfy: denoted as the preset tension force when the aramid thread is under tension, L is the length of the aramid thread after tension, and d is the pulling length after applying a tension force perpendicular to the tension direction of the aramid thread at the center using a tension gauge.

9. The installation method according to claim 5, characterized in that, In the lower layer aramid wire frame, any two aramid wires intersect to form a lower layer intersection point; in the multi-layer thermal insulation component laying method, each lower layer intersection point is fixed with single-sided aluminized polyester tape in the order from the inside to the outside, and then the aramid wires at the lower layer intersection point are sewn together with the multi-layer thermal insulation component by making a cross with stainless steel wire. In the upper aramid wire frame, any two aramid wires intersect to form an upper cross point; in the installation method of the upper aramid wire frame, each upper cross point is fixed with single-sided aluminized polyester tape in the order from the inside to the outside, and then the aramid wires at the upper cross points are sewn together with the multi-layer thermal insulation components by making a cross with stainless steel wire.

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