An extraterrestrial object sample sealed isolation packaging device and method thereof

Abstract

The application discloses an extraterrestrial celestial body sample sealing and isolating packaging device and a method thereof. The device comprises a sealing tank body, a sealing upper cover, a sealing lower cover, a rubber ring, a memory alloy and an internal packaging container. The sample is packaged in the internal packaging container. The internal packaging container is isolated from dust by a plastic sleeve bag. When the internal packaging container enters the sealing tank body, the rubber ring is squeezed to remove dust on the inner wall of the sealing tank body, and a compression spring pin is compressed to complete self-locking of the device. A heating film attached to the surface of the memory alloy is heated to restore the memory alloy. The upper tip of the memory alloy is pressed into an indium-tin alloy on the side of the tank cover. The lower two tips are pre-welded with indium-tin alloy. Heat conduction of the memory alloy forms brazing sealing between the memory alloy and the side wall gap of the tank. Finally, heating wires pre-installed on the lower surface of the sealing inner cover are heated to melt and seal the plastic cover and the plastic. The application is a light-weight composite sealing device. The whole operation process is relatively simple, and the guiding device is reliable.

Description

Technical Field

[0001] This invention pertains to extraterrestrial body sampling sealing devices, specifically relating to a sealing and isolation packaging device and method for extraterrestrial body samples. Background Technology

[0002] As humanity's research into extraterrestrial objects deepens, the scientific instruments carried by probes are no longer sufficient to meet the needs of this research. Therefore, it is necessary to bring samples from extraterrestrial objects back to Earth's laboratories for in-depth analysis, in order to study the origins of life and the celestial environment.

[0003] Since the successful return of lunar samples from Chang'e 5 in 2022, my country plans to conduct sample return missions to Mars and other more distant planets. The Mars sample return mission will primarily focus on: the formation and evolution of terrestrial planets (Mars is the fourth planet from the Sun and records the early evolutionary history of the solar system); planetary habitability (Mars is a neighboring terrestrial planet, and studying Mars will help us better understand Earth's past, present, and future development); and the search for extraterrestrial life.

[0004] According to relevant research, due to Mars' location near the habitable zone of the solar system, there is a possibility that life may exist on Mars. Therefore, the Mars sample return mission falls under Category V protection requirements. These higher protection requirements place certain demands on the sealing capabilities of the sealing devices over long distances and durations. In terms of achieving biological isolation through sealing, a two-way guarantee is needed: first, the Earth environment must not be directly introduced into the Martian environment, thus contaminating Mars; second, Martian samples must not be exposed to the Earth environment. In other words, the sealed containers and other components related to the sample return mission must break the chain of contact with the Martian environment.

[0005] For unmanned sample return missions, automated methods are needed to seal samples and verify the effectiveness of the seal. Existing planetary sampling sealing devices all use compression seals, which can meet certain requirements for dust prevention with solid seals, but for airtightness during reentry, the small effective sealing area of ​​compression seals leads to a high risk of leakage. Furthermore, the driving mechanism for applying the sealing force with compression seals is complex, resulting in a large weight of the supporting equipment. Therefore, research on isolation and encapsulation technology for samples from the surface of exoplanets is essential. Summary of the Invention

[0006] To address the problems in the prior art, the present invention provides a sealing and isolation packaging device for extraterrestrial celestial body samples, including a sealing upper cover, a sealing lower cover, a sealing tank, and an internal packaging container;

[0007] An internal encapsulation container is used to encapsulate extraterrestrial samples. The internal encapsulation container is covered with a plastic film. The sealing lower cover restricts the internal encapsulation container within the sealed canister. Multiple spring pin assemblies are evenly distributed circumferentially inside the sealing upper cover. The spring pin assemblies are arranged radially along the sealing upper cover. Each spring pin assembly is equipped with a pre-compression structure to limit its movement. The sealed canister is provided with a tapered hole fixing member to limit the position of the spring pin assemblies. The sealing upper cover is locked to the sealed canister through the spring pin assemblies to limit the position of the sealing lower cover and the internal encapsulation container.

[0008] The lower surface of the sealed upper cover has an annular protrusion, and a shape memory alloy is placed in the annular space between the annular protrusion and the inner wall of the sealed container. The outer periphery of the upper surface of the sealed lower cover has an annular groove, and the bottom of the shape memory alloy is fixedly installed in the annular groove. The shape memory alloy consists of a main structure and three pointed structures arranged from top to bottom along the main structure. Each pointed structure is symmetrically arranged on the left and right sides of the main structure. The annular protrusion and the sealed container have grooves at the uppermost pointed structure positions on the corresponding sides of the shape memory alloy. Pressure-bearing indium tin alloy is pre-welded into the grooves. The tips of the two lowest pointed structures of the shape memory alloy are pre-welded with brazed indium tin alloy. The main structure of the shape memory alloy has a polyimide heating film for heating the shape memory alloy. The film cable for energizing the polyimide heating film is encapsulated in the sealed upper cover. A rubber ring is installed on the outer wall of the sealed lower cover through a dovetail groove. A heating wire is installed at the bottom of the sealed lower cover and an electric heating wire cable for energizing the heating wire is arranged. A metal mesh is fixed below the heating wire.

[0009] Furthermore, a metal rubber buffer device and a plastic cover are arranged sequentially from bottom to top on the top of the inner packaging container. The metal rubber buffer device is used to dissipate the energy brought about by the inertial impact of the inner packaging container. The plastic film is sleeved on the outside of the inner packaging container with the metal rubber buffer device and plastic cover arranged on top, and the plastic cover is fused to the plastic film. The sealing lower cover is connected to the plastic cover of the inner packaging container by a connecting spring.

[0010] Furthermore, the sealed container is fixed to the external returner, and a sleeve fixture is provided inside the orbiter cabin. The sleeve fixture is used to install a sleeve spring to connect the sleeve plate. The plastic film that covers the internal encapsulation container is fixed to the sleeve plate by an elastic ring. The sleeve plate is kept in balance by the force provided by the sleeve spring and the elastic ring.

[0011] The present invention also provides a packaging method for the sealing and isolation packaging device for extraterrestrial samples, comprising the following steps:

[0012] Before sealing, the upper sealing cover, lower sealing cover, shape memory alloy and rubber ring are assembled. The metal mesh and heating wire at the bottom of the lower sealing cover are also installed. After all the assembly is completed, the upper sealing cover and the lower sealing cover are connected together to form a sealing cover assembly. The sealing cover assembly is connected to the plastic cover on the top of the inner packaging container through a connecting spring, thereby connecting the sealing cover assembly to the inner packaging container.

[0013] During sealing, the drive device pushes the sealing cover assembly and the internal encapsulation container into the sealing tank. Then the rubber ring is squeezed, and the dust on the inner wall of the sealing tank is removed as the internal encapsulation container moves downward. When the sealing cover assembly moves downward and the spring pin pops out and inserts into the conical hole fixing part, the device self-locking is completed.

[0014] The polyimide heating film heats the shape memory alloy, which restores its shape. The topmost tip structure of the shape memory alloy is pressed into the pressurized indium tin alloy of the sealed can and the sealed top cover, thus completing the shape memory alloy seal. The pre-welded indium tin alloy on the shape memory alloy is melted, thereby forming a brazed seal between the shape memory alloy and the sealed can and between the shape memory alloy and the sealed top cover.

[0015] Finally, the heating wire pre-installed at the bottom of the sealed cover is heated by the heating wire cable. The heat is conducted through the metal mesh, causing the plastic film to weld and seal the inner packaging container, thus completing the sealing of the entire device.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1) This invention adopts a sealing method of cold welding indium tin metal extruded by shape memory alloy, thus overcoming the large sealing force of metal gasket sealing structure. By utilizing the softness of indium tin metal and its physical properties of interatomic bonding, the restoring force of shape memory alloy can complete the extrusion sealing, thereby achieving high sealing capacity while reducing the power consumption and sealing force requirements.

[0018] 2) This invention employs an indium tin alloy brazing sealing method, thus overcoming the risks of gas leakage associated with existing sealing structures such as compression seals, and the problem of easy failure of the sealing structure under impact loads. This improves the airtightness of the device and provides a high-strength sealing interface. Therefore, while achieving good airtightness, the strength of the sealing interface is increased, thereby improving the reliability of the device.

[0019] 3) This invention uses a built-in metal rubber buffer device to buffer the high impact brought by the return, thus overcoming the insufficient buffering force caused by the use of rubber polymer in the prior art, and the excessive volume caused by the use of aluminum honeycomb for long-distance single buffering. It achieves a better buffering effect while reducing the weight of the entire device.

[0020] 4) This invention uses a passive bagging method to protect the container from dust while combining it with a heating device for plastic welding. This overcomes the disadvantages of active bagging packaging in the prior art, such as too many mechanical drive devices and excessive weight. It achieves better reliability of the passive method while reducing the weight of the entire device.

[0021] 5) This invention employs a redundant sealing method that combines multiple sealing methods, thus overcoming the shortcomings of the existing technology, such as the excessive sealing force required for pure extrusion sealing and the unreliable sealing structure, and achieving high sealing performance. Attached Figure Description

[0022] Figure 1 This is a three-dimensional cross-sectional view of the overall structure of the present invention.

[0023] Figure 2 This is an enlarged cross-sectional view of the overall structure of the present invention.

[0024] Figure 3 This is a layout diagram of the device before bagging during the pushing process.

[0025] Figure 4 This is a layout diagram of the device after the internal encapsulated container enters the sealed tank.

[0026] Figure 5 This is a drawing of the sealing cover part.

[0027] Figure 6 This is a drawing of the sealing lower cover part.

[0028] Figure 7 This is an assembly diagram of the sealing upper and lower covers.

[0029] Figure 8 These are enlarged views of the heating wire cable routing (left) and the thin film cable routing (right).

[0030] Figure 9 These are enlarged views of the tapered hole fastener and the pre-compression fastener.

[0031] Figure 10 The left image shows the assembly diagram of the bagging device, and the right image shows the state of the film after bagging is completed.

[0032] Figure 11 This is a diagram showing the alignment process between the sealing cap assembly and the sealing tank.

[0033] In the diagram, 1. Sealed upper cover; 2. Sealed lower cover; 3. Sealed tank body; 4. Internal encapsulated container; 5. Metal-rubber buffer device; 6. Socket head screw; 7. Spring; 8. Spring pin; 9. Shape memory alloy; 10. Elastic ring; 11. Plastic cap; 12. Pre-compressed wire thread insert; 13. Pre-compressed fastener; 14. Tapered hole fastener; 15. Tank body wire thread insert; 16. Pressure-bearing indium tin alloy; 17. Rubber ring; 18. Plastic film; 19. Metal mesh; 20. Heating wire; 21. Brazed indium tin alloy; 22. Polyimide heating film; 23. Connecting spring; 24. Sleeve spring; 25. Sleeve tooling; 26. Sleeve plate. Detailed Implementation

[0034] The present invention will be further described and illustrated below with reference to specific embodiments. The embodiments described are merely examples of the content of this disclosure and do not limit the scope of the invention. The technical features of each embodiment in the present invention can be combined accordingly, provided that there is no mutual conflict.

[0035] This invention designs a sealing and isolation device for extraterrestrial celestial samples. It employs multiple sealing methods to ensure a tight seal, including rubber ring sealing, plastic fusion sealing, soft metal extrusion sealing, and metal brazing sealing. The single rubber ring seal requires less sealing force and does not require a separate drive device. The soft metal extrusion seal and brazing seal are optimized in position, utilizing shape memory alloy for heat conduction to fully utilize heat. The soft metal extrusion seal and brazing seal are completed sequentially, improving heat utilization efficiency. The passive bagging structure is simple and highly reliable, and can prevent dust on the container surface from affecting the sealing structure to a certain extent. The plastic fusion seal further ensures the airtightness of the container. The weld area formed by brazing is larger than that of extrusion sealing, resulting in higher sealing reliability. Furthermore, with the buffering effect of the metal and rubber, the weld provides a stronger sealing interface.

[0036] This example provides a sealing and isolation packaging device for extraterrestrial body samples, such as... Figure 1 As shown, the device mainly includes a sealed upper cover 1, a sealed lower cover 2, and a sealed container 3. The sealed container 3 is installed in the return capsule of the extraterrestrial probe. While in orbit, the probe captures the internal encapsulation container 4 via a capture and transfer mechanism. The internal encapsulation container 4 is then pushed into the sealed container 3 by a pusher rod of a pushing mechanism for sealing. A soft metal extrusion seal is achieved through a shape memory alloy 9 in conjunction with a pressure-bearing indium tin alloy 16. A rubber ring 17 performs dust removal and rubber ring sealing. The tip structure of the shape memory alloy 9, together with the sealed container 3 and the brazed indium tin alloy 21, completes the brazing seal. An internal plastic film 18, together with a plastic cover 11, completes the plastic fusion seal. This combination of multiple sealing methods enhances the isolation level. Detailed structural diagrams of the device are shown below. Figure 2 As shown.

[0037] The sealed container 3 is a thin-walled cylindrical shape with a sealed bottom. The internal encapsulation container 4, which holds the sample, is first bagged using a sleeve 26. After bagging, the internal encapsulation container 4 enters the sealed container 3 through the top. The sealed container 3 is made of non-ferrous metals such as magnesium alloy or aluminum alloy. Due to the self-locking structure of the spring pin 8, and considering processing performance, a tapered hole fixing component 14 is added to the side wall of the sealed container 3 using a wire thread sleeve to limit the spring pin 8. The internal encapsulation container 4 is capsule-shaped. The tapered hole fixing component 14 has a rotating shape, with a two-stage stepped shaft shape on its outer surface. The steps (shoulders) position the tapered hole fixing component 14. The internal structure of the tapered hole fixing component 14 is a tapered hole. Both the inner and outer surfaces of the sealed container 3 are nickel-plated with oxide to ensure long-term performance. The inner wall surface of the rubber ring 17, which comes into contact with the moving parts, is coated with polytetrafluoroethylene to reduce friction.

[0038] In a specific embodiment of the present invention, the spring pin assembly consists of a spring 7 and a spring pin 8, and the pre-compression structure consists of a pre-compression fixing member 13 and a pre-compression wire thread sleeve 12. The pre-compression fixing member 13 is installed through the pre-compression wire thread sleeve 12. The pre-compression structure restricts the movement of the spring pin 8 through the pre-compression fixing member 13, thereby pre-compressing the spring 7. The pre-compression fixing member 13 is cylindrical on the outside and divided into two sections on the inside, including a cylindrical section that limits the linear movement of the spring pin 8 and a tapered section that pre-compresses the spring pin 8. The cylindrical section is close to the spring pin 8. The sealing upper cover 1 is also circumferentially and evenly provided with a plurality of screw countersunk holes. The sealing upper cover 1 is connected to the sealing lower cover 2 by screws. The number of blind holes and screw countersunk holes is greater than 3.

[0039] In a specific embodiment of the present invention, the shape memory alloy 9 is made of a single-pass nickel-titanium alloy to prevent large-scale temperature fluctuations from causing the shape memory alloy to deform again, thereby affecting the sealing effect; the annular groove and the sealing can 3 are pre-welded with pressure-bearing indium tin alloy 16 on both sides of the shape memory alloy 9 through the groove; the uppermost tip structure of the shape memory alloy 9 is provided with a polyimide heating film 22 for heating the shape memory alloy 9. The polyimide heating film 22 heats the shape memory alloy 9, causing the shape memory alloy 9 to recover its shape. At the same time, the uppermost tip structure of the shape memory alloy 9 cuts into the pressure-bearing indium tin alloy 16 in the grooves on both sides, and the pre-welded brazed indium tin alloy 21 on the shape memory alloy 9 melts, thereby forming a seal between the shape memory alloy 9 and the sealing can 3 and the sealing cover 1; the film cable is controlled by an external temperature control device and power supply.

[0040] In one specific embodiment of the present invention, the heating wire 20 is embedded in the sealing lower cover 2, and polytetrafluoroethylene is coated in the recess into which the heating wire 20 is embedded, so that the heating wire 20 and the sealing lower cover 2 are mutually insulated.

[0041] In a specific embodiment of the present invention, the conical hole fixing member 14 is installed by the tank body wire thread sleeve 15. The conical hole fixing member 14 is an axisymmetric structure with a stepped shaft shape on the outer surface. The installation position of the conical hole fixing member 14 is positioned by the shaft shoulder. The interior of the conical hole fixing member 14 is a conical hole structure, which limits the spring pin 8.

[0042] In a specific embodiment of the present invention, the materials of the sealing upper cover 1, the sealing lower cover 2, and the sealing tank 3 are selected from magnesium alloy or aluminum alloy to reduce the overall weight of the device. The sealing upper cover 1, the sealing lower cover 2, and the sealing tank 3 are arranged concentrically. The inner and outer surfaces of the sealing tank 3 are treated with nickel oxide plating to prevent corrosion of the parts during their service life, thereby ensuring the surface fit accuracy of the parts. The inner wall surface of the sealing tank 3 in contact with the rubber ring 17 is coated with polytetrafluoroethylene to reduce the friction during the pressing process of the rubber ring 17. The rubber ring 17 is used in the device. Dust is removed during the sealing process to prevent leakage gaps caused by dust on the inner wall of the sealed container 3 during the subsequent extrusion process of the shape memory alloy 9. At the same time, the rubber ring 17 provides good airtightness. The rubber ring 17 is an O-ring with a wire diameter of 1mm to 2.65mm and is made of low-phenyl silicone rubber. A metal rubber buffer device 5 is also installed at the bottom of the sealed container 3 to dissipate the energy brought by the inertial impact of the internal encapsulation container 4. The pre-compression fastener 13 and the conical hole fastener 14 are made of titanium alloy and stainless steel.

[0043] The sealing cover 1 is in the shape of a cover, such as Figure 5 As shown, the top surface is flat, and the bottom is a thin-walled circular structure. The sealing cover 1 is made of magnesium alloy or aluminum alloy. For lightweight design, the sealing cover 1 integrates a spring pin self-locking structure into the top reinforcing rib, similar to the sealing tank body 3. Considering processing performance, the side wall of the sealing cover 1 uses wire thread sleeves to add pre-compression fasteners 13 to pre-compress the spring 7. Figure 9 As shown, the pre-compression fixing member 13 is cylindrical on the outside and divided into two sections on the inside: a cylindrical section that limits the linear movement of the spring pin 8, and a tapered section that pre-compresses the spring pin 8. Three spring pins 8 are evenly distributed around the top circumference for self-locking. At the same time, the sealing upper cover 1 is also evenly provided with three countersunk screw holes around its circumference, through which the sealing lower cover 2 is connected.

[0044] The sealing cover 2 is in the shape of a round plate, such as Figure 6As shown, the top surface is flat, and the bottom surface is spherical. The sealing lower cover 2 is machined from magnesium alloy or aluminum alloy. A shape memory alloy 9 is installed on the upper part of the sealing lower cover 2 via a groove. The sealing lower cover 2 also has countersunk screw holes at the same positions as the screw countersunk holes of the sealing upper cover 1. The sealing lower cover 2 is fixed to the sealing upper cover 1 by hexagonal socket screws 6. The sealing upper cover 1 and the sealing lower cover 2 are aligned using the outer circumferential surface of the thin-walled annulus of the sealing upper cover 1 and the inner circumferential surface of the sealing lower cover 2 to ensure concentric installation accuracy. Figure 7 As shown. The lower part of the circumferential surface of the sealing lower cover 2 is provided with a dovetail groove for installing a rubber ring 17; a groove is provided on the lower surface of the sealing lower cover 2, and the sidewall of the groove is coated with polytetrafluoroethylene to insulate the heating wire 20 from the sealing lower cover 2. A copper metal mesh 19 is then fixed to the heating wire 20 by welding on the inner wall. The metal mesh 19 is used for uniform heat conduction to prevent damage to the plastic film caused by heat concentration.

[0045] The ground assembly process is as follows: the shape memory alloy 9 and rubber ring 17 of the pre-welded indium tin alloy 21 are installed on the sealing lower cover 2, and then the sealing upper cover 1 and sealing lower cover 2 are fixed by the internal hex screws 6. Finally, the spring pin self-locking structure is installed in the order of spring 7, spring pin 8, pre-compressed wire thread sleeve 12, and pre-compressed fastener 13. At this time, the conical surface of spring pin 8 and the conical surface of pre-compressed fastener 13 are in contact, and the spring has a certain preload to ensure the stability of the spring pin self-locking structure.

[0046] The heating wire 20 is installed in a groove coated with polytetrafluoroethylene in the sealed lower cover 2, and the metal mesh 19 is fixed to the lower surface of the sealed lower cover 2 under a certain tensile force by welding. The heating wire cable is led out through a reserved interface in the sealed lower cover 2, such as... Figure 8 As shown in the left-hand diagram. The sealed top cover 1 also encapsulates a thin-film cable, such as... Figure 8 As shown in the right figure, the thin-film cable energizes the polyimide heating film 22, thereby heating the shape memory alloy 9. The thin-film cable is controlled by an external temperature control device and power supply.

[0047] The sleeve fixture 25 is fixed to the internal wall of the orbiter cabin. The sleeve spring 24 stretches the sleeve plates 26 with a small amount of tension. The four sleeve plates 26 are constrained by the elastic ring 10 that fixes the plastic film 18. This completes the fixing of the internal mechanism, such as... Figure 3 As shown.

[0048] Assemble the sealing cap assembly, the plastic cap 11, the metal rubber buffer device 5 on the top of the internal encapsulation container 4, and the plastic cap 11. The sealing cap assembly and the plastic cap 11 are connected by a connecting spring 23, which plays a certain connecting role.

[0049] Before sealing, the inner packaging container 4 is captured and adjusted by an externally provided capture and transfer mechanism to align it with the device axis while restricting its axial movement. Figure 3 As shown.

[0050] During sealing, the pushing mechanism (driving device) pushes the inner packaging container 4 through the sleeve plate 26 for bagging, preventing dust from entering subsequent devices. The bottom of the inner packaging container 4 pushes the plastic film 18 away from the sleeve plate 26. When the elastic ring 10 leaves the sleeve plate 26, the sleeve plate 25 pops outward under the tension of the sleeve spring 24, preventing interference with the movement of the subsequent sealing cap assembly. Since the elastic ring 10 has detached from the sleeve plate 26, it contracts inward, thereby pressing the plastic film 18 onto the plastic cap 11. Figure 10 As shown.

[0051] The sealing cap assembly is driven downwards by a drive device to enter the sealing container 3. During the movement, the axis of the internal packaging container 4 is first adjusted by contact between the spherical dome surface of the capsule at the bottom of the internal packaging container 4 and the inner conical surface at the top of the sealing container 3. Then, the chamfer on the lower end face of the sealing cap 2 and the inner conical surface at the top of the sealing container 3 ensure that the centers of the entire sealing cap assembly, the internal packaging container 4, and the sealing container 3 are on the same axis. Figure 11 As shown. The drive device continues to push, pushing the internal encapsulated container 4 into the sealed tank 3. Then, the rubber ring 17 is compressed, and during the downward movement, dust on the inner wall of the sealed tank 3 is removed. The spring pin 8 moves through the inner conical surface at the top of the sealed tank 3 into the pin hole, compressing the spring 7. When the sealing upper cover 1 and sealing lower cover 2 move downward until the spring pin 8 pops out and inserts into the conical hole fixing member 14, the device self-locking is completed. Figure 4 As shown.

[0052] The shape memory alloy 9 is then heated using a polyimide heating film 22, causing it to gradually regain its shape. The uppermost tip of the shape memory alloy 9 is pressed into the pre-reserved pressure-bearing indium tin alloy 16 in the grooves of the sealed container 3 and the sealed top cover 1. The thin-walled blades on the inner and outer sides of the tip of the two lowest segments of the shape memory alloy 9 cut into the sealed top cover 1 and the sealed container 3, respectively. As the temperature rises, the brazed indium tin alloy 21 at the tips of the two lowest segments of the shape memory alloy 9 gradually melts and flows to the junction of the shape memory alloy 9 and the sealed container 3 under the action of surface tension, forming a brazed seal after cooling. The melting point of the brazed indium tin alloy 21 must match the deformation temperature of the shape memory alloy 9, with their temperature ranges being relatively close. By adjusting the material parameters, it is ensured that the brazed indium tin alloy 21 melts while the shape memory alloy 9 deforms, thus completing the brazing. The welding surface is pre-plated with nickel and gold before welding the brazed indium tin alloy 21 to ensure welding strength.

[0053] Then, the heating wire 20 is controlled by the controller to generate heat, and the heat is conducted to the plastic film 18 through the metal mesh 19, thereby completing the plastic welding and sealing operation.

[0054] The above-described embodiments are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. Those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A sealing and isolation packaging device for extraterrestrial celestial body samples, characterized in that, It includes a sealed upper cover (1), a sealed lower cover (2), a sealed tank body (3), and an internal encapsulation container (4). The inner encapsulation container (4) is used to encapsulate the extraterrestrial celestial body sample. The inner encapsulation container (4) is covered with a plastic film (18). The sealing lower cover (2) restricts the inner encapsulation container (4) within the sealing tank (3). The sealing upper cover (1) has multiple spring pin assemblies evenly distributed circumferentially inside. The spring pin assemblies are arranged radially along the sealing upper cover (1). Each spring pin assembly is equipped with a pre-compression structure to limit its movement. The sealing tank (3) is provided with a conical hole fixing member (14) to limit the spring pin assembly. The sealing upper cover (1) locks the sealing lower cover (2) and the inner encapsulation container (4) by the spring pin assembly and the sealing tank (3). The lower surface of the sealing top cover (1) is provided with an annular protrusion, and a shape memory alloy (9) is provided in the annular space between the annular protrusion and the inner wall of the sealing tank (3); the outer periphery of the upper surface of the sealing bottom cover (2) is provided with an annular groove, and the bottom of the shape memory alloy (9) is fixedly installed in the annular groove. The shape memory alloy (9) is composed of a main structure and three tip structures arranged from top to bottom along the main structure. Each tip structure is symmetrically arranged on the left and right sides of the main structure. The annular protrusion and the sealing tank (3) are provided with grooves at the uppermost tip structure positions on both sides of the shape memory alloy (9). Pressure-reinforced indium tin is pre-welded into the grooves. Alloy (16); The tip positions of the two lowest tip structures of the shape memory alloy (9) are pre-welded with indium tin alloy (21). The main structure of the shape memory alloy (9) is provided with a polyimide heating film (22) for heating the shape memory alloy (9). The film cable for energizing the polyimide heating film (22) is encapsulated in the sealed upper cover (1). A rubber ring (17) is installed on the outer side wall of the sealed lower cover (2) through a dovetail groove. A heating wire (20) is installed at the bottom of the sealed lower cover (2) and an electric heating wire cable for energizing the heating wire (20) is arranged. A metal mesh (19) is fixed below the heating wire (20).

2. The extraterrestrial body sample sealing and isolation packaging device according to claim 1, characterized in that, The inner packaging container (4) is provided with a metal rubber buffer device (5) and a plastic cover (11) arranged from bottom to top on the top. The metal rubber buffer device (5) is used to consume the energy brought by the inertial impact of the inner packaging container (4). The plastic film (18) is sleeved on the outside of the inner packaging container (4) which is provided with the metal rubber buffer device (5) and the plastic cover (11) on the top. The plastic cover (11) is fused to the plastic film (18). The sealing lower cover (2) is connected to the plastic cover (11) of the inner packaging container (4) by a connecting spring (23).

3. The sealing and isolation packaging device for extraterrestrial body samples according to claim 2, characterized in that, The spring pin assembly consists of a spring (7) and a spring pin (8). The pre-compression structure consists of a pre-compression fixing member (13) and a pre-compression wire thread sleeve (12). The pre-compression fixing member (13) is installed through the pre-compression wire thread sleeve (12). The pre-compression structure restricts the movement of the spring pin (8) through the pre-compression fixing member (13), thereby pre-compressing the spring (7). The pre-compression fixing member (13) is cylindrical on the outside and divided into two sections on the inside, including a cylindrical section that restricts the linear movement of the spring pin (8) and a tapered hole section that pre-compresses the spring pin (8). The cylindrical section is close to the spring pin (8). The sealing cover (1) is also circumferentially and uniformly provided with multiple screw countersunk holes. The sealing cover (1) is connected to the sealing cover (2) by screws. The number of blind holes and screw countersunk holes is greater than 3.

4. The extraterrestrial body sample sealing and isolation packaging device according to claim 3, characterized in that, The shape memory alloy (9) is made of a single-pass nickel-titanium alloy to prevent large temperature fluctuations from causing the shape memory alloy (9) to deform again, thus affecting the sealing effect. The polyimide heating film (22) heats the shape memory alloy (9) to restore its shape. At the same time, the tip structure at the top of the shape memory alloy (9) cuts into the pressure-bearing indium tin alloy (16) in the grooves on both sides. The brazed indium tin alloy (21) pre-welded on the shape memory alloy (9) melts, thus forming a seal between the shape memory alloy (9) and the sealed can (3) and the sealed top cover (1). The film cable is controlled by an external temperature control device and power supply.

5. The extraterrestrial body sample sealing and isolation packaging device according to claim 3, characterized in that, The heating wire (20) is embedded in the sealing lower cover (2), and polytetrafluoroethylene is coated in the recess into which the heating wire (20) is embedded, so that the heating wire (20) and the sealing lower cover (2) are mutually insulated.

6. The sealing and isolation packaging device for extraterrestrial body samples according to claim 3, characterized in that, The conical hole fastener (14) is installed by the steel wire thread sleeve (15) of the tank body. The conical hole fastener (14) is an axisymmetric structure with a stepped shaft shape on the outer surface. The installation position of the conical hole fastener (14) is positioned by the shaft shoulder. The conical hole fastener (14) has a conical hole structure inside, which limits the spring pin (8).

7. The sealing and isolation packaging device for extraterrestrial body samples according to claim 4, characterized in that, The sealing upper cover (1), sealing lower cover (2), and sealing tank (3) are made of magnesium alloy or aluminum alloy to reduce the overall weight of the device. The sealing upper cover (1), sealing lower cover (2), and sealing tank (3) are arranged concentrically. The inner and outer surfaces of the sealing tank (3) are treated with nickel oxide to prevent corrosion of the parts during their service life, thereby ensuring the surface fit accuracy of the parts. The inner wall surface of the sealing tank (3) in contact with the rubber ring (17) is coated with polytetrafluoroethylene to reduce the friction during the pressing process of the rubber ring (17). The rubber ring (17) is used to remove dust during the sealing process of the device, and to prevent leakage gaps caused by the dust on the inner wall of the sealed tank (3) during the subsequent extrusion process of the shape memory alloy (9). At the same time, the rubber ring (17) can provide good airtightness. A metal rubber buffer device (5) is also installed at the bottom of the sealed tank (3). The metal rubber buffer device (5) is used to consume the energy brought by the inertial impact of the internal encapsulation container (4). The pre-compression fastener (13) and the conical hole fastener (14) are made of titanium alloy and stainless steel.

8. The sealing and isolation packaging device for extraterrestrial body samples according to claim 7, characterized in that, The sealed tank (3) is fixed to the external returner. The orbiter cabin is equipped with a sleeve fixture (25). The sleeve fixture (25) is used to install a sleeve spring (24) to connect the sleeve plate (26). The plastic film (18) that covers the internal encapsulation container (4) is fixed to the sleeve plate (26) by an elastic ring (10). The sleeve plate (26) is kept in balance by the force provided by the sleeve spring (24) and the elastic ring (10).

9. The sealing and isolation packaging device for extraterrestrial body samples according to claim 6, characterized in that, The rubber ring (17) is an O-ring with a wire diameter of 1mm to 2.65mm, and the material of the rubber ring (17) is low-phenyl silicone rubber.

10. A method for packaging the extraterrestrial body sample sealing and isolation packaging device as described in claim 3, characterized in that, Includes the following steps: Before sealing, the sealing upper cover (1), sealing lower cover (2), shape memory alloy (9) and rubber ring (17) are assembled. The metal mesh (19) and heating wire (20) at the bottom of the sealing lower cover (2) are also installed together. After all the assembly is completed, the sealing upper cover (1) and sealing lower cover (2) are connected together to form a sealing cover assembly. The sealing cover assembly is connected to the plastic cover (11) at the top of the inner packaging container (4) through the connecting spring (23), thereby connecting the sealing cover assembly to the inner packaging container (4). During sealing, the drive device pushes the sealing cover assembly and the inner encapsulation container (4) into the sealing tank (3). Then the rubber ring (17) is squeezed, and the dust on the inner wall of the sealing tank (3) is removed during the downward movement of the inner encapsulation container (4). When the sealing cover assembly moves downward to the point where the spring pin (8) pops out and inserts into the conical hole fixing piece (14), the device self-locking is completed. The polyimide heating film (22) heats the shape memory alloy (9), and the shape memory alloy (9) recovers its shape. The tip structure at the uppermost end of the shape memory alloy (9) is pressed into the pressure indium tin alloy (16) of the sealed can (3) and the sealed top cover (1), thus completing the shape memory alloy seal. The brazed indium tin alloy (21) pre-welded on the shape memory alloy (9) is melted, thereby forming a brazed seal between the shape memory alloy (9) and the sealed can (3) and between the shape memory alloy (9) and the sealed top cover (1). Finally, the heating wire (20) pre-installed at the bottom of the sealed cover (2) is heated by the heating wire cable. The heat is conducted through the metal mesh (19), so that the plastic film (18) performs plastic welding and sealing on the inner packaging container (4), and finally completes the sealing of the entire device.

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