Orbital molecular screen capable of improving volume and vacuum degree of wake flow area

Abstract

The invention provides an orbital molecular screen for improving the volume and vacuum degree of a wake flow area, the screen surface of the orbital molecular screen has an arc-shaped characteristic, and the arc-shaped screen surface protrudes towards the flight direction of the orbital molecular screen, so that when the orbital molecular screen flies in a low orbit, an ultrahigh vacuum area is formed in the arc-shaped screen surface, and the volume and vacuum degree of the wake flow area are improved. And the vacuum degree of the ultrahigh vacuum area is 10 <-11 > Pa. The central angle between the connecting line of the two ends of the section of the arc-shaped screen surface and the center of the protrusion of the section and the horizontal central line is theta, and theta is larger than 0 and smaller than 90 degrees; the thickness d of the section of the arc-shaped screen face is larger than 0 and smaller than 100 cm. The curvature between the neutral axis of the cross section of the arc-shaped screen face and the rotation center point of the cross section is r, and r is larger than 0 and smaller than infinity. According to the orbital molecular screen provided by the invention, the problems that the vacuum volume of an ultrahigh vacuum area formed by a traditional orbital molecular screen is too small and the vacuum degree is not high are solved.

Description

Technical Field

[0001] The present application relates to the field of aerospace equipment, and in particular to an orbital molecular screen for increasing the volume and vacuum degree of a wake region. Background Art

[0002] The orbital molecular screen is a stainless steel disk that flies at high speed in a low orbit (300km-500km). It is placed in front of the orbiter or experimental equipment in the flight direction. According to the principle of high-speed kinematics, an ultra-high vacuum zone (about 10 -11 Pa), providing an ultra-high vacuum region for orbiters or experimental equipment.

[0003] The United States launched a total of three space missions with orbital molecular screens "Wake Shield Facility" between 1994 and 1996. Russia began to implement a similar orbital molecular screen space device "Screen-M" in 1996. However, the orbital molecular screen devices of both are almost the same, that is, a stainless steel flat disk with a diameter of about 3.7m and a thickness of 0.3m. Although this structural design can achieve ultra-high vacuum in its wake area on the predetermined orbit, it is far from the theoretical calculated value (about 10 -11 Pa), only reached 10 -9 Pa.

[0005] Therefore, due to the limitation of the planar disc-like structure of the existing orbital molecular screen, the ultra-high vacuum region formed by the structure not only has a too small vacuum volume, but also has a low vacuum degree.

[0006] Due to the rapid development of space science and technology in recent years, especially the emergence of commercial aerospace companies led by Space X, the transportation costs for space travel have been greatly reduced, and there is a trend of further reduction in the future. Against this background, space experiments and space manufacturing have ushered in a booming development. The orbital molecular screen provides the necessary experimental and production environment for the experiments of molecular beam epitaxy technology in space and the large-scale production of high-performance semiconductor materials in space. Therefore, the optimized structural design of the orbital molecular screen will also provide technical support for this trend. Summary of the invention

[0007] In view of the above problems, the present invention provides an orbital molecular screen that increases the volume and vacuum degree of the wake zone, so as to solve the problem that the vacuum volume of the ultra-high vacuum zone formed by the traditional orbital molecular screen is too small and the vacuum degree is not high.

[0008] The technical solution of the present invention is: An orbital molecular screen for increasing the volume and vacuum degree of a wake zone, wherein the screen surface of the orbital molecular screen has an arc-shaped feature, wherein the arc-shaped screen surface is convex toward the flight direction of the orbital molecular screen, so that when the orbital molecular screen flies in a low orbit, an ultra-high vacuum zone is formed in the arc-shaped screen surface, and the vacuum degree of the ultra-high vacuum zone is 10 -11 Pa.

[0009] As one of the preferred solutions, the cross section of the curved screen has the following characteristics: The central angle between the lines connecting the two ends of the cross section of the arc-shaped screen and the center of the protrusion of the cross section and the horizontal center line is θ, where 0<θ<90°; The thickness of the cross section of the arc-shaped screen is d, wherein 0<d<100cm; The curvature between the neutral axis of the cross section of the arc-shaped screen and the rotation center point of the cross section is r, wherein 0<r<∞.

[0010] As one of the preferred solutions, on the profile of the cross section of the curved screen, a central angle θ1 formed by one end of the cross section of the curved screen is equal to a central angle θ2 formed by the other end of the cross section of the curved screen.

[0011] As one of the preferred solutions, d at any position on the profile of the cross section of the arc-shaped screen is the same or different.

[0012] As one of the preferred solutions, r at any position on the profile of the cross section of the arc-shaped screen is the same or different.

[0013] As one of the preferred solutions, the orbital molecular screen is a hemispherical disk.

[0014] As one of the preferred solutions, the screen body material of the orbital molecular screen is 304L stainless steel or U15C stainless steel.

[0015] As one of the preferred solutions, the 304L stainless steel is prepared through multiple steps of cleaning, baking, gas discharge bombardment and surface treatment.

[0016] As one of the preferred solutions, the inner surface of the orbital molecular screen is equipped with at least production equipment and quality inspection equipment, and the outer surface of the orbital molecular screen is installed with at least measurement equipment, calculation equipment and positioning equipment.

[0017] As one of the preferred options, the low orbit range is 300km-500km.

[0018] Compared with the prior art, this application has the following advantages: The present invention proposes an orbital molecular screen for increasing the volume and vacuum degree of the wake zone, wherein the screen surface of the orbital molecular screen has an arc-shaped feature, wherein the arc-shaped screen surface is convex toward the flight direction of the orbital molecular screen, so that when the orbital molecular screen flies in a low orbit, an ultra-high vacuum zone is formed in the arc-shaped screen surface, and the vacuum degree of the ultra-high vacuum zone is 10 -11 Pa.

[0019] By adopting the technical solution of the present application, the embodiment of the present invention adopts an orbital molecular screen with arc-shaped features. When the payload size of the launch vehicle is fixed, compared with the traditional molecular screen, the invention not only increases the volume of the wake zone, but also improves the vacuum degree of the wake zone. Therefore, the experimental equipment can obtain a more ideal working environment during orbital flight. During space experiments, the gas particles in the external environment flowing from the side to the center of the wake zone are reduced, reducing the risk of contamination. Therefore, the optimized design of the orbital molecular screen not only meets various experimental needs, but also promotes the comprehensive development of space experiments and manufacturing industries. The arc-shaped structure optimizes the vacuum conditions and adapts to the needs of future large-scale manufacturing. With the continuous development of commercial aerospace, the orbital molecular screen will become the core equipment for realizing high-quality material production and complex experiments, providing important support for future space economy and scientific and technological innovation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the description of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0021] Figure 1 This is the principle diagram of the formation of the ultra-high vacuum region of the orbital molecular screen; Figure 2 It is a multi-view combination diagram of the traditional orbital molecule screen; Figure 3 It is a multi-view combination diagram of the optimized orbital molecular screen described in one embodiment of the present application; Figure 4 is a design form characteristic diagram of a cross section of an orbital molecular screen according to an embodiment of the present application; Figure 5 It is a schematic diagram of the assembly position of the orbital molecular screen and external equipment described in one embodiment of the present application.

[0022] Description of reference numerals: 1. Orbital molecular screen; 2. Inner surface equipment; 3. Outer surface equipment. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0024] The orbital molecular screen is a stainless steel disk that flies at high speed in a low orbit (300km-500km). It is placed in front of the orbiter or experimental equipment in the flight direction. According to the principle of high-speed kinematics, an ultra-high vacuum zone (about 10 -11 Pa), providing an ultra-high vacuum region for orbiters or experimental equipment.

[0025] It can be known that the applicable objects of the molecular orbital screen are special and unique. The molecular orbital screen 1 is not only used to create extremely high vacuum conditions, but also can fly under extreme conditions such as low-Earth orbit, and can meet the unique technical requirements and environmental conditions of space. Different from traditional test equipment, its functions and application range are unique in high-performance material production and scientific experiments, so it is particularly suitable for high-performance semiconductor material growth and precision experiments in space environments. At the same time, the molecular orbital screen integrates production equipment, quality inspection equipment, environmental monitoring equipment and computing systems, and can also be used as a carrier for building a comprehensive experimental platform.

[0026] Reference Figure 1 As shown, Figure 1 The structure and working principle of the ultra-high vacuum zone formed by the orbital molecular screen 1 when flying in low-Earth orbit are shown in the figure. When flying in low orbit at a speed of about 7800m / s, a cone-shaped layered ultra-high vacuum zone will be formed in the wake area behind the screen body of the orbital molecular screen 1. The vacuum degree in this ultra-high vacuum zone gradually decreases from front to back, while the highest vacuum degree in the vacuum zone of the conventional orbital molecular screen 1 can usually only reach 10 -9 Pa.

[0027] Combination Figure 1 , and continue to refer to Figure 2 , Figure 2 It is a multi-view composite diagram of the existing orbital molecular screen 1. It can be known that the existing orbital molecular screen 1 is a planar disc structure. The ultra-high vacuum region formed by this structure when flying in a low-altitude orbit not only has a too small vacuum volume, but also has a low vacuum degree.

[0028] In view of the existing insufficiency, that is, the existing orbital molecular screen is limited by its planar disc-shaped structure, the designer has found through continuous research and years of practical experience that part of the reason for this phenomenon is that the high-speed hydrogen atoms enter the wake area, causing the pressure in the wake area to increase. The planar configuration of the orbital molecular screen 1 makes it easier for hydrogen atoms to enter the wake area along the side, resulting in increased pressure. Therefore, due to the limitation of the planar disc-shaped structure, it is impossible to provide an ideal ultra-high vacuum environment for space experiments and manufacturing.

[0029] Therefore, based on this background and research findings, the present invention aims to optimize the structural design of the orbital molecular screen 1, improve the structural form and the path for hydrogen atoms to enter the wake region, and propose an optimized design scheme to expand the volume of the vacuum region and improve the vacuum degree.

[0030] Reference Figure 3 As shown, Figure 3 The present invention shows a multi-view composite diagram of an optimized orbital molecular screen 1. The present invention provides an orbital molecular screen 1 that increases the volume and vacuum degree of the wake zone. The screen surface of the orbital molecular screen 1 has an arc-shaped feature, wherein the arc-shaped screen surface is convex toward the flight direction of the orbital molecular screen 1, so that when the orbital molecular screen 1 flies in a low orbit, an ultra-high vacuum zone is formed in the arc-shaped screen surface, and the vacuum degree of the ultra-high vacuum zone is 10 -11 Pa.

[0031] Specifically, the present invention improves the structural form of the traditional orbital molecular screen 1. It is designed from a surface-shaped disc to a three-dimensional screen with arc-shaped features. In low orbits, such as flying at 300km-500km, an ultra-high vacuum zone is formed in the wake area. In this embodiment, the bulge of the plane of the arc-shaped structure faces the flight direction, that is, the convex surface faces the wind, so as to block and guide more airflow to the outside, and a larger and more stable conical vacuum area is formed in the arc-shaped opening. Manufacturing is supported in this vacuum area, and it can also be used as a verification platform for new technologies, which can be used for testing under extreme conditions that cannot be completed in ground laboratories, providing new breakthroughs for scientific research and laying the foundation for future technological innovation.

[0032] The orbital molecular screen 1 is designed as a curved screen surface, so the curved screen surface reduces the edge effect, the gas molecules are dispersed along the curved surface, and flow smoothly around the two sides of the screen body, blocking the hydrogen atoms from directly flowing back along the side and being drawn into the wake area, greatly reducing the probability of hydrogen atoms entering the wake area from the side of the screen body. The reduction of hydrogen atoms further reduces the air pressure in the wake area, making the vacuum degree closer to the theoretical value (10 -11 Pa). Therefore, the optimized structure can improve the vacuum degree in the wake area, further enhance the performance of the orbital molecular screen 1, and provide a more ideal ultra-high vacuum environment for future spacecraft and experimental equipment.

[0033] At the same time, the arc-shaped structure guides the airflow to be more concentrated and extended backward when flying in low orbit, and the gas molecules are not easy to bypass the arc-shaped screen surface and enter the wake area, thus forming a longer and more stable conical wake area. Therefore, the conical opening of the wake area of ​​the optimized structure will be larger than that of the flat configuration, so that the vacuum area behind the screen body covers a larger space.

[0034] Thus, based on these principles, the embodiment of the present invention adopts an orbital molecular screen 1 with arc-shaped features. When the payload size of the launch vehicle is fixed, compared with the traditional molecular screen, the invention not only increases the volume of the wake zone, but also improves the vacuum degree of the wake zone. Therefore, the experimental equipment can obtain a more ideal working environment during orbital flight. During space experiments, the gas particles in the external environment flowing from the side to the center of the wake zone are reduced, reducing the risk of contamination. Therefore, the optimized design of the orbital molecular screen 1 not only meets various experimental needs, but also promotes the comprehensive development of space experiments and manufacturing industries. The arc-shaped structure optimizes the vacuum conditions and adapts to the needs of future large-scale manufacturing. With the continuous development of commercial aerospace, the orbital molecular screen 1 will become the core equipment for realizing high-quality material production and complex experiments, providing important support for future space economy and scientific and technological innovation.

[0035] In some embodiments, the screen surface of the orbital molecular screen 1 may be partially arc-shaped or entirely continuous arc-shaped. For example, the arc-shaped feature may be a spherical arc with an opening, an elliptical arc with an opening, a parabolic arc, a hemispherical arc, a multi-segment arc composed of multiple arc segments with different curvatures, a hyperbolic paraboloid arc, etc.

[0036] More specifically, the arc-shaped features of the orbital molecular screen 1 can be selected according to the geometric shape, curvature and application requirements. The following are several optional arc-shaped features of the orbital molecular screen 1 in this embodiment: like Figure 3 As shown, Figure 3 The design form characteristic diagram of the cross section of the orbital molecular screen 1, where a is the front view; b is the side view; c is the top view; d is the side view. X and Y respectively represent the horizontal and vertical axes on the cross section where the rotation center of the orbital molecular screen 1 is located. The arc dotted line represents the neutral axis of the cross section of the arc screen. The two inclined straight dotted lines represent the lines connecting the two ends of the cross section of the arc screen and the center of the bulge of the cross section. The rectangular outline dotted line represents the limit case of the arc screen.

[0037] The cross section of the arc-shaped screen has the following characteristics: The central angle between the lines connecting the two ends of the cross section of the arc-shaped screen and the center of the protrusion of the cross section and the horizontal center line is θ, where 0<θ<90°; The thickness of the cross section of the arc-shaped screen is d, wherein 0<d<100cm; The curvature between the neutral axis of the cross section of the arc-shaped screen and the rotation center point of the cross section is r, wherein 0<r<∞.

[0038] Specifically, the technical invention is an orbital molecular screen 1 with a certain thickness and a disc-like shape, which includes curvature (radius), thickness and bending angle. Among them, the cross-section of the arc-shaped screen surface is a two-dimensional plane, and in this embodiment, the cross-section can be a longitudinal section. Among them, the two ends of the cross-section are the two end points of the arc profile, and the protrusion is the vertex of the arc profile. Therefore, the two ends of the protrusion to the cross-section are in two directions respectively. In some embodiments, the arc lengths of the protrusions to the two ends of the cross-section can be equal and symmetrical, or unequal and irregular. In some embodiments, when the curvature is the same, the arc length can be determined by the center angle.

[0039] Specifically, the center angles between the lines connecting the two ends of the cross section and the center of the protrusion of the cross section and the horizontal center line are θ, and design schemes for all possible θ values ​​of 0<θ<90° are included. In this embodiment, θ can represent the opening size of the orbital molecular screen 1, that is, the degree of opening of the arc-shaped contour. For example, when θ is a small angle, the endpoints of the arc-shaped contour are closer to the horizontal center line. When θ is a large angle, the endpoints of the arc-shaped contour are farther away from the horizontal center line, resulting in a larger arc surface. Among them, when θ is 90°, it is the limiting case of the present arc screen surface, that is, the plane configuration (such as Figure 4 The dotted line in the figure shows a rectangle).

[0040] Therefore, θ can determine the degree of curvature of the screen, ranging from a nearly planar configuration to a structure that gradually transitions to a spherical or rugby-shaped structure.

[0041] Specifically, the thickness of the cross section of the arc-shaped screen is d, and includes design solutions for all possible thicknesses d of 0<d<100cm. Among them, the orbital molecular screen 1 is thinner, close to 0cm, light in weight and easy to launch, but has poor deformation resistance and unstable vacuum effect. It is thicker, close to 100cm, with high structural stability, which can reduce vibration and environmental interference, but the weight increases. Therefore, 0<d<100cm balances the relationship between the structural stability and weight of the orbital molecular screen 1 to ensure that it can effectively block the airflow without affecting the launch cost and performance.

[0042] Specifically, the curvature between the neutral axis of the cross section of the arc screen and the rotation center point of the cross section is r, and includes design schemes for all possible curvatures (radii) of 0<r<∞. Among them, for a two-dimensional cross section, the neutral axis is the center line that bends along the arc contour and is located at the geometric center of the arc surface. Among them, r determines the curvature of the arc surface, that is, the radius of the arc or arc shape. If r is the same at any point, it is a concentric curvature. If r is different at multiple / arbitrary points, an asymmetric arc surface will be formed, such as a sudden arc, ellipse or parabola shape. For example, a smaller radius (r gradually approaches 0) will produce a tightly curved arc surface with a shallow arc structure, a smaller arc opening, and a smaller volume of the wake area. A larger radius (r gradually approaches ∞) will be infinitely close to a planar structure.

[0043] Therefore, the curved screen can not only meet the requirements of ultra-high vacuum environment, but also maintain structural stability and optimize airflow during flight. The reasonable setting of at least one feature can provide a theoretical basis and design guidance for subsequent practical applications and performance verification, which helps to ensure the efficient performance of the orbital molecular screen in actual use.

[0044] Preferably, the structural features of the curved screen surface include a combination of one or more of the above three features, forming a non-planar curved orbital molecular screen 1 with a variety of regular symmetric or complex three-dimensional surfaces. Through reasonable combination and optimization, it can meet the needs of different types of space missions in the future and achieve a higher vacuum degree and wake zone volume.

[0045] In some embodiments, when optimizing the structure of the orbital molecular screen 1 to increase the vacuum degree and volume of the wake region, further optimization can be achieved through parameters such as material selection and surface treatment.

[0046] Further, on the profile of the cross section of the curved screen, the center angle θ1 formed by one end of the cross section of the curved screen is equal to the center angle θ2 formed by the other end of the cross section of the curved screen. In this embodiment, on the profile of the cross section of the curved screen, along the length direction of the neutral axis, the center angle θ1 is formed between the line connecting the first end point of the two endpoints and the center of the protrusion and the horizontal center line. The center angle θ2 is formed between the line connecting the second end point and the center of the protrusion and the horizontal center line.

[0047] Specifically, θ1 is equal to θ2, so when the thickness and curvature are uniformly transitioned / the same toward both ends, the arc profile is symmetrical, such as a hemispherical, bowl-shaped, spherical, elliptical, or parabolic molecular screen.

[0048] Specifically, θ1 is different from θ2, so the cross section is an asymmetric arc, and the first end is smaller or larger in opening degree than the second end.

[0049] Furthermore, on the profile of the cross section of the arc-shaped screen, d at any position is the same or different. In this embodiment, the arc-shaped cross section has a uniform thickness, that is, the thickness of all positions of the screen is consistent.

[0050] Further, on the cross-sectional profile of the arc-shaped screen, r at any position is the same or different. In this embodiment, since there are several curvatures in the length direction from the rotation center point to the neutral axis, the several curvatures can be completely the same, partially the same, or completely different.

[0051] If r is the same at all positions on the cross section while the other parameters are the same, a symmetrical curved surface with uniform curvature is formed; if r is different, a symmetrical / asymmetrical curved surface with uneven curvature is formed.

[0052] Exemplarily, the screen may be in the shape of a hemisphere, a spherical surface, or a bowl, with the curvature being the same in all directions.

[0053] Exemplarily, the screen may be in the shape of an elliptical arc, similar to an arc intercepted from an ellipsoid, which is flat, with different curvatures in different directions, but the overall structure is symmetrical.

[0054] Exemplarily, the screen surface may be in the shape of a parabola, with the curvature gradually decreasing from the central area to the two edges, and the curvature being partially different and partially the same in different directions, but the overall structure is also symmetrical.

[0055] For example, the screen surface can be a multi-segment arc, which is composed of multiple arc segments with different curvatures to form an irregular arc surface. In this embodiment, the curvature between the segments can be uniform or intermittently changed to form a symmetrical wavy curved surface.

[0056] In a further technical solution, the orbital molecular screen 1 is a hemispherical disk.

[0057] In combination with the above embodiments, Figure 3 and Figure 4 As shown, the orbital molecular screen 1 is preferably such that θ1 is equal to θ2, and the thickness d is the same, and r is the same at any position, such as r1 is equal to r2, and has the characteristics of a partial sphere, but the arc is not as deep as that of a hemisphere, that is, shorter than the arc length of a complete hemisphere. Therefore, this structural design can form a uniform vacuum area in a larger range, making the air pressure in the wake area more uniform and closer to the theoretical vacuum value, and can accommodate more experimental equipment, suitable for commercial space missions, suitable for molecular beam epitaxy experiments of high-performance semiconductor materials, and large-scale production and manufacturing of high-performance semiconductor materials in space.

[0058] In another preferred embodiment extended from this embodiment, the screen material of the orbital molecular screen 1 is 304L stainless steel or U15C stainless steel. In this embodiment, the device is limited to use in space (i.e., space more than 100 kilometers away from the earth's surface). Therefore, the molecular orbital screen 1 is dedicated to working in a space environment under extreme conditions. The material selection of the orbital molecular screen (304L stainless steel or U15C stainless steel) is combined with the space use environment to ensure its high efficiency performance under extreme conditions and meet the unique needs of space applications.

[0059] Specifically, the equipment is made of stainless steel with the lowest outgassing rate and good protection against the extreme space environment, such as 304L or U15C. 304L stainless steel is a low-carbon austenitic stainless steel. Its low carbon content can maintain good mechanical properties in both high and low temperature environments, making it suitable for use in extreme conditions, especially in space environments. It can resist corrosion from tiny particles and gases and ensure a long-term stable vacuum state. U15C stainless steel, as a high-strength, corrosion-resistant alloy, is particularly suitable for high loads and high temperature environments. Therefore, it is suitable for use in space conditions and can withstand dynamic loads during flight.

[0060] It can be seen that the selected 304L or U15C stainless steel, orbital molecular screen can create an extremely high vacuum environment in space.

[0061] Among them, the outgassing rate of the material is related not only to the properties of the material itself, but also to the manufacturing process and storage conditions of the material. Therefore, the pretreatment process (such as cleaning, baking, gas discharge bombardment, surface treatment, etc.) also has a great influence on the outgassing rate of the material. By comparing the outgassing rate and other conditions of different materials and different surface conditions, 304 stainless steel with a surface that has been vacuum baked, glass ball polished, degreased and chemically cleaned is selected as the material for manufacturing the orbital molecular screen 1.

[0062] It is understood that in the pretreatment process, cleaning can remove surface dirt, grease and other contaminants to reduce the possibility of gas release. Baking can remove moisture and volatile substances from the material by heating, reducing the outgassing rate. Gas discharge bombardment can use low-pressure gas discharge to clean the surface of the material to remove the oxide layer and microscopic impurities. Surface treatment can improve the properties of the material surface through chemical or physical methods to reduce gas adsorption.

[0063] In some embodiments, the outgassing rate of the material is affected by various factors. The pretreatment process may also include polishing, chemical passivation, deposition, etc. to further optimize the outgassing rate and performance of the material and ensure the stability and reliability of 304L stainless steel in an ultra-high vacuum environment.

[0064] Figure 5It is a schematic diagram of the assembly position of the orbital molecular screen 1 and external equipment according to an embodiment of the present application.

[0065] In some other embodiments, the inner surface of the orbital molecular screen 1 is equipped with at least production equipment and quality inspection equipment, and the outer surface of the orbital molecular screen 1 is installed with at least measurement equipment, calculation equipment and positioning equipment.

[0066] In this embodiment, the inner surface equipment 2 includes: production equipment and quality inspection equipment.

[0067] Production equipment may include molecular beam epitaxy systems for growing high-performance semiconductor films under ultra-high vacuum conditions. Thin film evaporation equipment supports the evaporation and deposition of thin film materials such as metal oxides and nitrides in ultra-high vacuum environments. 3D printing and additive manufacturing equipment are used for the manufacture of new materials and the processing of structural parts to achieve large-scale production in space. Quality inspection equipment may include optical detectors for real-time detection of film thickness and surface finish. X-ray analyzers detect the crystal structure of materials to ensure the quality of the produced semiconductor materials. Temperature and vacuum monitoring systems ensure that production equipment operates in a constant temperature and stable vacuum environment.

[0068] The external surface equipment 3 includes: measuring equipment, computing equipment and positioning equipment.

[0069] The measuring equipment may include environmental sensors for detecting the temperature, radiation and residual gas concentration in the orbital environment. The air pressure sensor monitors the vacuum degree in the wake area of ​​the screen in real time to ensure that the vacuum environment meets the experimental requirements. The computing equipment is used to process experimental data and control the various equipment of the orbital molecular screen 1 to ensure the intelligent operation of the system. At the same time, it records the production and experimental data in real time and transmits the data back to the ground via satellite communication. The positioning equipment may include a GPS system or a Beidou navigation system to accurately locate the position of the orbital molecular screen 1 in space and ensure the attitude control of the screen. The attitude control device includes a gyroscope and an attitude control thruster, which are used to adjust the flight direction of the orbital molecular screen 1 to keep it in the best working condition.

[0070] Therefore, by configuring the inner surface device 2 and the outer surface device 3 on the orbital molecular screen 1, it is ensured that the molecular screen can efficiently and accurately support space experiments and material manufacturing, providing an ideal platform for future space technology and industrial development.

[0071] In summary, with the rapid development of commercial aerospace and the deepening of space science research, traditional barrier equipment can no longer meet the needs of high-performance material manufacturing in ultra-high vacuum environments. The design of the orbital molecular screen 1 with arc-shaped features in the embodiment of the present invention is intended to overcome these limitations. When the size of the carrier rocket payload is fixed, compared with the traditional molecular screen, the invention not only increases the volume of the wake zone, but also improves the vacuum degree of the wake zone. Therefore, the experimental equipment can obtain a more ideal working environment during orbital flight. During space experiments, the gas particles in the external environment flowing from the side to the center of the wake zone are reduced, reducing the risk of contamination. Therefore, the optimized design of the orbital molecular screen 1 not only meets various experimental needs, but also promotes the comprehensive development of space experiments and manufacturing industries. The arc structure optimizes the vacuum conditions and adapts to the needs of future large-scale manufacturing. The orbital molecular screen 1 can give full play to its unique application and technical advantages in ultra-high vacuum environments, and conduct relevant experiments on platforms such as the International Space Station, making it an ideal solution for high-performance materials in space experiments and production.

[0072] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0073] It should also be noted that, in this article, the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations, nor can they be understood as indicating or implying relative importance. Moreover, the term "include" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device.

[0074] The above is a detailed introduction to an orbital molecular screen for increasing the volume and vacuum degree of the wake zone provided by the present application. Specific examples are used herein to illustrate the principle and implementation method of the present application. The description of the above embodiments is only used to help understand the present application, and the content of this specification should not be understood as a limitation on the present application. At the same time, for a person of ordinary skill in the art, according to the present application, there will be different forms of changes in the specific implementation methods and application scopes. It is not necessary and impossible to list all the implementation methods here, and the obvious changes or modifications derived therefrom are still within the scope of protection of the present application.

Claims

1. An orbital molecular screen for increasing the volume and vacuum degree of the wake region, characterized in that: The screen surface of the orbital molecular screen has an arc-shaped feature, wherein the arc-shaped screen surface is convex toward the flight direction of the orbital molecular screen, so that when the orbital molecular screen flies in a low orbit, an ultra-high vacuum region is formed in the arc-shaped screen surface, and the vacuum degree of the ultra-high vacuum region is 10 -11 Pa.

2. An orbital molecular screen for increasing the volume and vacuum degree of the wake region according to claim 1, characterized in that: The cross section of the arc-shaped screen has the following characteristics: The central angle between the lines connecting the two ends of the cross section of the arc-shaped screen and the center of the protrusion of the cross section and the horizontal center line is θ, where 0<θ<90°; The thickness of the cross section of the arc-shaped screen is d, wherein 0<d<100cm; The curvature between the neutral axis of the cross section of the arc-shaped screen and the rotation center point of the cross section is r, wherein 0<r<∞.

3. An orbital molecular screen for increasing the volume and vacuum degree of the wake region according to claim 2, characterized in that: On the profile of the cross section of the curved screen, a central angle θ1 formed by one end of the cross section of the curved screen is equal to a central angle θ2 formed by the other end of the cross section of the curved screen.

4. The orbital molecular screen for increasing the volume and vacuum degree of the wake region according to claim 2, characterized in that: On the profile of the cross section of the arc-shaped screen, d at any position is the same or different.

5. The orbital molecular screen for increasing the volume and vacuum degree of the wake region according to claim 4, characterized in that: On the profile of the cross section of the arc-shaped screen, r at any position is the same or different.

6. An orbital molecular screen for increasing the volume and vacuum degree of the wake region according to any one of claims 1 to 5, characterized in that: The orbital molecular screen is a hemispherical disk.

7. The orbital molecular screen for increasing the volume and vacuum degree of the wake region according to claim 1, characterized in that: The screen body material of the orbital molecular screen is 304L stainless steel or U15C stainless steel.

8. The orbital molecular screen for increasing the volume and vacuum degree of the wake region according to claim 7, characterized in that: The 304L stainless steel is prepared through multiple steps of cleaning, baking, gas discharge bombardment and surface treatment.

9. The orbital molecular screen for increasing the volume and vacuum degree of the wake region according to claim 1, characterized in that: The inner surface of the orbital molecular screen is equipped with at least production equipment and quality inspection equipment, and the outer surface of the orbital molecular screen is equipped with at least measurement equipment, calculation equipment and positioning equipment.

10. The orbital molecular screen for increasing the volume and vacuum degree of the wake region according to claim 1, characterized in that: The low orbit range is 300km-500km.

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