Satellite surface multi-layer heat insulation assembly with strong electromagnetic environment protection capability

A multi-layer thermal insulation component and strong electromagnetic technology, which is applied in the direction of thermal protection devices of aerospace vehicles, artificial satellites, space navigation equipment, etc. Good thermal control temperature characteristics, avoid strong electromagnetic wave interference, prevent burning effect

Active Publication Date: 2021-09-24

BEIJING INST OF SPACECRAFT ENVIRONMENT ENG

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AI-Extracted Technical Summary

Problems solved by technology

[0005] At present, when protecting against microwave coupling by the back door, the method of adding a shielding layer is usually used, and the satellite itself is covered with a set of thermal control protection layers on the star surface, which is the first line of defense against the influence of strong electromagnetic waves, but This set of thermal control protection layers has the defect tha...

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Method used

Anti-electromagnetic reinforcement facial mask group 3, is coated on laminated assembly surface, has strong electromagnetic environment protective effect; Specifically, as shown in Figure 1, anti-electromagnetic reinforcement facial mask group 3 has polyimide layer 302 and metal layer 303 , and, relative to the polyimide layer, the metal layer 303 is arranged close to the laminated assembly, and the polyimide layer 302 has good thermal temperature control characteristics and total dose effect; and, the indium tin oxide film 301 is arranged on the polyimide layer 302 is far away from the surface of the metal layer 303, which plays the role of anti-atomic oxygen environment performance, prevents the electrostatic discharge caused by the accumulation of ele...

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Abstract

The invention discloses a satellite surface multi-layer heat insulation assembly with high electromagnetic environment protection capacity. The satellite surface multi-layer heat insulation assembly comprises a laminated assembly and an anti-electromagnetic reinforcing mask group covering the surface of the laminated assembly; the anti-electromagnetic reinforcing mask group is connected with the laminated assembly in a sewing manner through a sewing line; the surface of the laminated assembly is coated with the anti-electromagnetic reinforcing mask group, the laminated assembly and the anti-electromagnetic reinforcing mask group are sewn through the sewing line, the anti-electromagnetic reinforcing mask group is provided with the polyimide layer and the metal layer, the metal layer is relatively close to the laminated assembly, the laminated assembly faces a protected product during use, and the polyimide layer faces the external environment; the polyimide layer has good thermal control temperature characteristic and total dose effect, and the metal layer has the effects of electromagnetic radiation resistance and self damage resistance, so that the heat insulation assembly can be effectively prevented from being burnt down, and a protected product is prevented from being interfered by strong electromagnetic waves.

Application Domain

Cosmonautic thermal protectionArtificial satellites

Technology Topic

SatellitePolyimide +5

Image

Examples

Experimental program(2)

Example Embodiment

[0035] Example one

[0036] Please refer to figure 1 Schematic structural diagram of a first embodiment of the catalog multilayer insulation assembly of the present application have shown to provide a strong electromagnetic environmental protection capability, comprising:

[0037] Laminate assembly,

[0038] Group 3 against electromagnetic reinforcement mask, which covers the surface of the laminated assembly; said mask against electromagnetic reinforcement group 3 are connected by suturing the suture 4 with the laminated assembly;

[0039] The anti-electromagnetic reinforcing Mask 3 includes a group of the polyimide layer 302 and the metal layer 303 and the metal layer 303 disposed relatively close to the laminated assembly;

[0040] In use, the laminated assembly toward the product to be protected, the polyimide layer 302 toward the outside environment.

[0041] In this embodiment, if figure 2 , The laminated assembly having a reflective layer, the reflective layer is a number of at least five and stacked, for increasing the thermal infrared radiation; type Here, the reflection layer 1 is, for example, a thickness of 6 microns and 10 microns sided aluminized polyester film;

[0042] 2 a spacer layer disposed between two adjacent reflective layers 1, functions as a layer between the heat conductive spacer reflective layer; Here, two types of spacer layer, for example, polyester mesh;

[0043] Group 3 against electromagnetic reinforcement mask, covering the surface of the laminated assembly, with a strong protective effect electromagnetic environment; Specifically, as figure 1 , The anti-electromagnetic reinforcement group mask 3 having a polyimide layer 302 and the metal layer 303 and the metal layer 303 is relatively close to the polyimide layer laminated assembly is provided, the polyimide layer 302 having good thermal control temperature characteristics and total dose effects; and, indium tin oxide film 301, disposed on the surface of the polyimide layer 302 away from the metal layer 303, the sub-functions antigen oxygen environmental performance, preventing static charge accumulation caused by electrostatic discharge can also protect a metal layer 303, reducing the effect of metal secondary electron multiplier; here, the thickness of the polyimide layer 302, for example, 25 micrometers;

[0044] A metal layer 303 having anti-electromagnetic radiation damage effects and anti-self; type Here, the metal layer 303, for example, an aluminum layer or a silver layer thickness of 6 microns and 10 microns, according to the actual needs of nickel or the like may be appropriately added permeable material ;

[0045] Specifically, the thickness of the metal layer 303 should be at least not less than one skin depth of the microwave (a skin depth of the metal may cause the intensity of microwave transmitted is reduced to the original intensity of 1 / e = 36.8%, power reduction of the original 1 / e2 = 13.5%), taking into account the safety margin, the thickness of the aluminum layer is recommended in two or more skin depths, wherein, using the following equation technique skin depth (in m):

[0046]

[0047] Where, ω is the angular frequency of vibration of the microwave field (rad / s); μ 0 Magnetic permeability metal conductor in a vacuum, which is 4π × 10 -7 Hm -1; [Sigma] is the conductivity of the metal (in Ω -1 M -1 ). When the angular frequency is fixed, the greater the conductivity of the metal, the skin depth corresponding to the smaller, e.g., aluminum, the conductivity at room temperature of about 3.54 × 107Ω -1 M -1. Generally it refers to a strong electromagnetic wave in 1GHz-300GHz frequency electromagnetic waves, without loss of generality, to select the lower frequency limit condition represented as calculated in accordance with the RF pulse frequency of 1GHz corresponds to a skin depth of about 2.675 × 10 -6 m. At this time, the thickness of the intermediate aluminum layer should be greater than 2.675 × 10 -6 m × 2 = 5.4 × 10 -6 m, it is recommended that where the metal layer 6 having a thickness of 303 microns.

[0048] Further, anti-electromagnetic reinforcement mask 3 and the group connection of the stacked assembly, alternatively, for example, a suture connection, specific connection using a suture reinforcement against electromagnetic mask 4 and the stacked assembly group 3 sutured, and the suture close contact with the metal layer 303 of the laminated assembly, in use, the laminated assembly toward the product to be protected, the polyimide layer 302 toward an external environment; type here, the suture 4 is, for example resistance wire or polyester fuel line.

[0049] Further, such as image 3 , The circular hole 5, to open an anti-electromagnetic reinforcement group mask 3, for relieving pressure; and, this circular hole satisfy the specifications required of the electromagnetic shielding pressure relief requirements;

[0050] In particular, strong electromagnetic waves generally refers to 1GHz-300GHz frequency electromagnetic waves, without loss of generality, generally selected shortest wavelength (frequency corresponding to 300GHz) with a wavelength of about 1mm shield the upper limit is required aperture diameter smaller than the wavelength of 1 / 4, i.e., as long as the opening diameter of the pores in the 1 / 4mm or less meet the shielding requirements. Thus the diameter of the opening should be less than 0.25mm, the diameter of the opening may be selected to 0.2mm. Taking into account the characteristics of the pressure rapidly, the aperture area per unit area should be larger than the predetermined opening ratio is equal to the industry standard of 0.5% to 1%, 1% calculated here taking.

[0051] 1cm2 circular area is calculated according to the distance using the following equation:

[0052]

[0053] Wherein, A is a unit area of 1cm 2 , R is the radius of the circular hole, from the above equation, the number N per unit area of the circular hole 32, thereby taking into account the margin relief may calculate the distance between the circular hole should not greater than 1.77mm.

[0054] , The diameter of the circular hole 5 herein, for example 0.2mm, and the spacing between adjacent two round holes 5, for example, 1.6mm; in an amount of at least 32 per unit area.

[0055] Further, this catalog multilayer insulation assembly during installation, a multilayer hollow fixing pin and two metal block in the form of mounting, the through hole to prevent occurrence of the situation.

Example Embodiment

[0056] Example 2

[0057] like Figure 4 , When the cable needs to wear some wear cabin compartment, there is a star slit holes, high power microwave is easily coupled through the holes into the interior of the star, the star cause internal interference sensitive devices, even burned, so the need for holes for closure.

[0058] In order to prevent leakage caused by wave HOLES slot compartment through a cable, a waveguide, other conduit occurs, the group 3 against electromagnetic reinforcing mask designed slit aperture mask structure 6 wrapped group;

[0059] Specifically, the slit aperture mask wrapped group 6 for absorbing waves due to the leak caused by the cable wires, so that microwave power reaches high wear greatly reduced power chamber bore;

[0060] Wrapping the slit aperture mask 6 includes a set of sequentially arranged carburized layer polyimide layer 601, the intermediate metal layer 602 and an inner layer of polyimide layer 603 carburization, the carburized inner polyimide layer 603 is relatively close protection products; carburized layer of polyimide layer 601 and a polyimide inner carburized layer 603, to ensure that the heat may be deposited outside the microwave radiation, but also play the role of a conductive electrostatic, 7 conveniently connected to a ground terminal; intermediate metal layer 602, a material for enhancing the absorption characteristics of leaky waves, here, the intermediate metal layer 602, for example, a higher resistivity, a magnetically permeable material; the thickness can be selected within a skin depth;

[0061] Here, the polyimide layer 601 carburized layer and the inner layer thickness of polyimide carburized poly layer 603, for example, 5 microns and 10 microns; type intermediate metal layer 602, such as a nickel layer thickness of 0.24 m ; Ni material selected for the representative of the worst conditions, in accordance with the RF pulse frequency of 300GHz calculated skin depth corresponding to about 2.4 × 10 -7 m, i.e., 0.24 micron;

[0062] DETAILED hole plugging gaps, such as Figure 5 Shown, through the cable 8 through the rear cabin deck should adherent stars 9 traces an upper cover catalog embodiment of the multilayer embodiment of a heat insulating assembly, the cable 8 through the compartment holes extravehicular slit portion needs wrapped parcel mask group 6. And to ensure that the bore hole through the slot compartment mask wrapped group 6 from the boundary has at least two wavelengths, where, for example, to take 20cm, and the slit aperture mask wrapped group 6 is required in the above-described multi-layer insulation element below the catalog, Do not expose the individual star vitro. Catalog and to ensure ground line 10 is connected with a multi-layer sheet insulation assembly connecting organ, which is wrapped in communication with the slit aperture mask 6 of the ground line group, unified ground.

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PUM

Property	Measurement	Unit
Diameter	0.2	mm
Thickness	6.0 ~ 10.0	µm
Thickness	5.0 ~ 10.0	µm
tensile		MPa
Particle size		Pa
strength	10

Description & Claims & Application Information

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the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine

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Classification and recommendation of technical efficacy words

Avoid burning

Satellite surface multi-layer heat insulation assembly with strong electromagnetic environment protection capability

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

Image

Examples

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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