Superconducting trapper and method for packaging parts in Dewar through magnetic suspension

Abstract

The invention provides a superconducting catcher and a method for magnetic suspension packaging of parts in a Dewar. The superconducting catcher catches the parts to a suspension point corresponding to a local magnetic tool; the local magnetic tool is transferred to vacuum degassing equipment for vacuum treatment; the superconducting trapper transfers the parts on the local magnetic tool to the cold table to form a suspension type stacking structure; and glue is injected into suspension gaps of the suspension type stacking structure, and the suspension type stacking structure is put into a drying oven to be cured to form the packaging structure. The magnetic control technology is adopted to accurately control the distance between parts, glue is directly injected into the suspension gap, the situation that one side is thin and the other side is thick is avoided, the overload-resistant reliability of the packaging structure on the upper portion of the cold table is remarkably improved, and the optical precision is remarkably improved. In addition, the superconducting catcher and the local magnetic tool are both in non-contact contact with the parts, the pollution probability of the parts is reduced, and the requirement for the vacuum degree in the Dewar is met.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration infrared sensor preparation, in particular to a method for a superconducting catcher and magnetic suspension packaging of internal components of a dewar. Background Art

[0002] During the manufacturing process of cooled infrared detectors, extremely high requirements are placed on the cleanliness of the Dewar's internal surface to ensure an ultra-high vacuum level within the detector, thereby guaranteeing the detector's performance and stability. As a core component of a cooled infrared detector, the Dewar not only needs to provide a low-temperature environment to ensure the normal operation of the detector chip, but also needs to protect it from the influence of external thermal radiation, which requires the Dewar's interior to remain extremely pure.

[0003] To meet these high cleanliness requirements, the interior surfaces of the dewar typically undergo a complex series of surface treatment steps, including but not limited to cleaning, passivation, and coating, to remove any possible microparticles, grease residue, or other contaminants. However, in actual operation, even after these rigorous surface treatments, internal components inevitably come into contact with other objects during transfer and storage, such as tweezers used for gripping or the inner walls of storage boxes. This contact can cause secondary contamination, further contaminating the already highly clean surface, and this type of contamination is often difficult to detect through conventional detection methods.

[0004] In addition, the multiple glue curing and position calibration steps in the Dewar packaging process are also important factors affecting the cleanliness of the final product. In these processes, due to the need to precisely control the positional relationship of each component and wait for the glue to completely cure, the entire packaging process takes a long time. Long-term operation increases the risk of external contaminants entering the interior of the Dewar, and may also cause more gas molecules to be adsorbed on the inner wall of the Dewar, further affecting the vacuum degree. And if Figure 1 As shown, on the cold finger 7, when the glue 10 is injected into each layer of components for bonding, one side will be thinner and the other thicker, which will cause stress concentration. Summary of the Invention

[0005] Based on the above content, the present invention provides a superconducting capture and a method for magnetically levitation packaging of internal components of the Dewar, aiming to solve technical problems in the prior art such as difficulty in ensuring vacuum during packaging of internal components of the Dewar and need to improve packaging efficiency.

[0006] The present invention provides a superconducting catcher, which includes a flow guide and a superconducting head at the lower end of the flow guide. The upper end of the flow guide is a backflow inlet. The fluid introduced by the flow guide cools the superconducting head. After cooling, the superconducting head becomes a superconducting state, so as to perform non-contact capture of magnetic components.

[0007] Furthermore, a handle is provided on the deflector.

[0008] The present invention provides a method for magnetically levitating and packaging components inside a dewar, which is applied to a refrigerated infrared detector. The method uses the aforementioned superconducting trap and pre-installs magnet assemblies in the cold stage and components to be stacked, so that both the cold stage and the components have local magnetism. The method includes the following packaging steps:

[0009] Step A1: prepare a superconducting catcher and a local magnetic tooling. The local magnetic properties of the local magnetic tooling form a suspension point, and the superconducting catcher performs non-contact capture of the component.

[0010] Step A2: Use a superconducting catcher to capture the component to the suspension point corresponding to the local magnetic tooling, and the component is suspended above the suspension point corresponding to the local magnetic tooling;

[0011] Step A3: transferring the local magnetic fixture with the suspended parts to a vacuum degassing device, where the parts are vacuum treated;

[0012] Step A4: Use a superconducting catcher to transfer the parts on the local magnetic fixture to the cold stage, because the cold stage and the magnet assembly of the parts form a suspended stacking structure;

[0013] Step A5: inject glue into the suspension gap of the suspended stack structure and place it in an oven for curing to form a packaging structure.

[0014] Furthermore, the magnetic component of the cold stage is embedded in the cold stage, and the magnetic component of the cold stage includes a magnet block, and the S pole of the magnet block is arranged downward;

[0015] The components to be stacked include a transition block, a magnet block on the transition block, and arc-shaped magnetic strips arranged around the magnet block. When the transition block is suspended and stacked above the cold stage, the magnet block of the transition block and the magnet block of the cold stage are facing each other.

[0016] The S pole of the arc-shaped magnetic strip of the transition block faces the cold stage below, and the N pole of the magnet block of the transition block faces the cold stage below.

[0017] Furthermore, the components to be stacked also include a substrate, and the magnet assembly of the transition block includes a magnet block and arc-shaped magnetic strips arranged around the magnet block;

[0018] When the substrate is suspended and stacked above the transition block, the magnet block on the substrate and the magnet block of the transition block are opposite to each other up and down, the arc-shaped magnetic strips of the substrate and the arc-shaped magnetic strips of the transition block are opposite to each other up and down, the S pole of the magnet block of the substrate faces the transition block below, and the S pole of the arc-shaped magnetic strips of the substrate faces the transition block below.

[0019] Furthermore, the components to be stacked also include a cold screen, and a group of magnetic components are provided at the lower end of the cold screen. The magnet components of the cold screen include a magnet block and arc-shaped magnetic strips arranged around the magnet block;

[0020] When the cold screen is suspended and stacked above the substrate, the magnet block at the lower end of the cold screen and the magnet block on the substrate are opposite to each other up and down, the arc-shaped magnetic strip at the lower end of the cold screen and the arc-shaped magnetic strip on the substrate are opposite to each other up and down, the N pole of the magnet block in the magnetic assembly at the lower end of the cold screen faces the substrate below, and the S pole of the arc-shaped magnetic strip in the magnetic assembly at the lower end of the cold screen faces the substrate below.

[0021] Furthermore, the components to be stacked also include a filter, and the upper end of the cold screen is further provided with a group of magnetic components, the magnet component at the upper end of the cold screen includes a plurality of arc-shaped magnetic strips forming a ring, and the magnetic component of the filter includes a plurality of arc-shaped magnetic strips forming a ring;

[0022] When the filters are suspended and stacked above the cold screen, the arc-shaped magnetic strips on the upper end of the cold screen and the arc-shaped magnetic strips on the filters are opposite to each other, and the upward polarity of the arc-shaped magnetic strips on the upper end of the cold screen is the same as the downward polarity of the arc-shaped magnetic strips on the filters.

[0023] Furthermore, the local magnetic tooling has multiple suspension points, each of which corresponds to a type of component;

[0024] In step A2, all components to be stacked in a package are captured by a superconducting catcher to the corresponding suspension points of the local magnetic fixture;

[0025] In step A3, the local magnetic fixture on which all the components to be stacked are suspended is transferred to a vacuum degassing device, and the vacuum degassing device performs vacuum treatment on all the components to be stacked simultaneously.

[0026] Furthermore, in step A4, all components to be stacked are sequentially transferred and stacked onto the cold stage using a superconducting catcher to form a suspended stacking structure;

[0027] In step A5, glue is injected into each suspension gap in the suspended stack structure at the same time, and then placed in an oven for curing to form a packaging structure.

[0028] Furthermore, in step A2, after the superconducting catcher captures the component to the suspension point corresponding to the local magnetic tooling, high magnetic permeability silicon steel is inserted between the superconducting head and the component, and then the superconducting catcher is removed.

[0029] The beneficial technical effects of this invention are: Magnetic control technology is used to precisely control the spacing between components during glue packaging. Glue is directly injected into the suspension gap, eliminating the situation where one side is thinner than the other, reducing stress concentration, significantly improving the overload resistance and reliability of the packaging structure on the cold stage, and significantly enhancing optical precision. Furthermore, during the component transfer process, the use of superconducting catchers and localized magnetic tooling ensures non-contact contact with the components, significantly reducing the probability of component contamination and ensuring the required vacuum level within the dewar. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The existing glue injection method is thick on one side and thin on the other side.

[0031] Figure 2 This is a flow chart of the steps of a method for magnetically levitating and packaging internal components of a dewar according to the present invention;

[0032] Figure 3 This is a bottom view of the magnet assembly layout of the corresponding components in the method for magnetically levitating and packaging internal components of a dewar according to the present invention;

[0033] Figure 4 This is a diagram showing the layout of the magnets at the local magnetic tooling suspension points in a method for magnetically levitation packaging of internal components of a dewar according to the present invention;

[0034] Figure 5 A schematic diagram of the local magnetic tooling suspension point and the intermediate repulsion and peripheral attraction of the transition block in a method for magnetically levitation packaging of internal components of a dewar according to the present invention;

[0035] Figure 6 This is a schematic structural diagram of a superconducting capture device in a method for magnetically levitating and packaging components inside a dewar according to the present invention;

[0036] Figure 7 This is a diagram showing the process of separating the superconducting catcher and components in a method for magnetically levitation packaging of internal components of a dewar according to the present invention;

[0037] Figure 8 This is a diagram of the process of a superconducting catcher capturing and releasing components to a local magnetic tooling in a method for magnetically levitation packaging of components inside a dewar according to the present invention;

[0038] Figure 9 This is a diagram of the process from stacking components on a cold table to injecting glue in a method for magnetically levitation packaging of internal components of a dewar according to the present invention;

[0039] Figure 10 The corresponding relationship between the magnetic components of the local components after the stacked components are packaged on the cold stage in the method for magnetically levitation packaging of the internal components of the dewar of the present invention;

[0040] Among them, 1-cold stage; 2-transition block; 3-substrate; 4-cold screen; 5-local magnetic tooling; 6-superconducting capture; 61-flow guide; 62-superconducting head; 63-handle; 7-cold finger; 8-high magnetic permeability silicon steel; 9-filter; 10-glue; 11-glue gun. DETAILED DESCRIPTION

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0042] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0043] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0044] See also Figure 6 The present invention provides a superconducting catcher, which includes a flow guide 61 and a superconducting head 62 at the lower end of the flow guide 61. The upper end of the flow guide 61 is a backflow inlet. The fluid introduced by the flow guide 61 cools the superconducting head 62. After cooling, the superconducting head becomes a superconducting state, so as to perform non-contact capture of magnetic components.

[0045] Furthermore, a handle 63 is provided on the deflector 61 .

[0046] The superconducting catcher of the present invention is similar to a funnel with a handle on the side for holding. The bottom material is a high-temperature superconducting head. Liquid nitrogen is directly introduced into the funnel to cool the high-temperature superconducting head to achieve a superconducting state. Figure 6 As shown, the superconducting catcher catches the transition block (2) in a non-contact manner and transfers the transition block to the cold stage 1 of the cold finger 7.

[0047] See also Figure 2 The present invention provides a method for magnetically levitating and packaging components inside a dewar, which is applied to a refrigerated infrared detector. The method uses a superconducting trap described above, and pre-installs a magnet assembly in a cold stage 1 and components to be stacked, so that both the cold stage and the components have local magnetism. The method includes the following packaging steps:

[0048] Step A1: prepare the superconducting catcher 6 and the local magnetic tooling 5. The local magnetism of the local magnetic tooling 5 forms a suspension point, and the superconducting catcher 6 performs non-contact capture of the component.

[0049] Step A2: Use the superconducting catcher 6 to capture the component to the corresponding suspension point of the local magnetic tooling 5, and the component is suspended above the corresponding suspension point of the local magnetic tooling 5;

[0050] Step A3, transferring the local magnetic tooling 5 with the suspended parts to a vacuum degassing device, where the vacuum degassing device performs vacuum treatment on the parts;

[0051] Step A4: Use the superconducting catcher 6 to transfer the components on the local magnetic tooling 5 to the cold stage 1, because the cold stage 1 and the magnet assembly of the components form a suspended stacking structure;

[0052] Step A5: inject glue 10 into the suspension gap of the suspended stack structure, and place it in an oven for curing to form a packaging structure.

[0053] Glue packaging uses magnetic control technology to precisely control the spacing between components. Glue is injected directly into the suspended gap, eliminating the need for thinner parts on one side and thicker parts on the other. This reduces stress concentration, significantly improving the overload resistance and optical precision of the packaging structure on the cold stage. Furthermore, during component transfer, superconducting catchers and localized magnetic tooling ensure non-contact contact with the components, significantly reducing the risk of component contamination and ensuring the required vacuum level within the dewar.

[0054] Furthermore, the magnetic component of the cold stage 1 is embedded in the cold stage 1, and the magnetic component of the cold stage 1 includes a magnet block, and the S pole of the magnet block is arranged downward;

[0055] The components to be stacked include a transition block 2, a magnet block on the transition block 2, and arc-shaped magnetic strips arranged around the magnet block. When the transition block 2 is suspended and stacked above the cold stage 1, the magnet block of the transition block 2 and the magnet block of the cold stage 1 are opposite each other.

[0056] The S pole of the arc-shaped magnetic strip of the transition block 2 faces the cold stage 1 below, and the N pole of the magnet block of the transition block 2 faces the cold stage 1 below.

[0057] The cold stage 1 of the present invention is embedded with a magnet assembly to form a local magnetic cold stage. A conventional cold stage is made using a traditional preparation method, and then a groove is milled on its surface with a small milling cutter to embed the magnet into the interior of the cold stage to form a local magnetic cold stage. Ultrafast lasers can also be used to etch grooves of the same shape to achieve the embedding process. The magnet assembly of the cold stage 1 includes a magnet block that can be square and placed in the center of the cold stage. The S pole of the central magnet block of the cold stage 1 faces downward, while the N pole faces upward.

[0058] Transition block 2 can be formed by gel-casting after pre-placing a magnet assembly in a mold. Alternatively, it can be dry-pressed or 3D-printed in a mold with the magnet assembly pre-placed. The central magnet in transition block 2's magnet assembly is square, with its north pole facing downward. This creates a repulsive force against the upward-pointing north pole of the cold stage magnet, allowing transition block 2 to levitate above cold stage 1, creating a suspension gap between them. The surrounding arc-shaped magnets in transition block 2's magnet assembly face downward, with their north poles facing upward.

[0059] Specifically, the transition plate 2 serves as a transition between the cold stage and the base plate 3 .

[0060] Furthermore, the components to be stacked further include a base plate 3, and the magnet assembly of the transition block 2 includes a magnet block and arc-shaped magnetic strips arranged around the magnet block;

[0061] When the substrate 3 is suspended and stacked above the transition block 2, the magnet block on the substrate 3 and the magnet block of the transition block are opposite to each other up and down, the arc-shaped magnetic strips of the substrate 3 and the arc-shaped magnetic strips of the transition block are opposite to each other up and down, the S pole of the magnet block of the substrate 3 faces the transition block 2 below, and the S pole of the arc-shaped magnetic strips of the substrate 3 faces the transition block 2 below.

[0062] Substrate 3 can be formed by gel-casting after pre-placing a magnet assembly in a mold, or by dry-pressing or 3D printing within a mold pre-placing the magnet assembly. The central magnet block in Substrate 3's magnet assembly is square, with its south pole facing downward, creating a repulsive force with the upward-facing south pole of the magnet block in transition plate 2. The surrounding arc-shaped magnets in Substrate 3's magnet assembly, with their south poles facing downward, create an attractive force with the upward-facing north poles of the arc-shaped magnets in transition plate 2. This allows Substrate 3 to float above transition plate 2, creating a suspension gap between them.

[0063] like Figure 3 and Figure 10 As shown, the polarities of the magnet blocks facing each other upward and downward are the same, forming a repulsive force, and the arc-shaped magnetic strips arranged around the magnet blocks form an attractive force upward and downward, which can maintain a stable and uniform attractive force around the repulsive force between two adjacent components (transition plate and substrate, substrate and cold screen), and accurately control the distance between the components, that is, the suspension distance, without the situation where one side is higher than the other.

[0064] Furthermore, the components to be stacked also include a cold shield 4, a group of magnetic components are provided at the lower end of the cold shield 4, and the magnet component of the cold shield 4 includes a magnet block and arc-shaped magnetic strips arranged around the magnet block;

[0065] When the cold screen 4 is suspended and stacked above the substrate 3, the magnet block at the lower end of the cold screen 4 and the magnet block on the substrate 3 are opposite to each other up and down, the arc-shaped magnetic strip at the lower end of the cold screen 4 and the arc-shaped magnetic strip on the substrate 3 are opposite to each other up and down, the N pole of the magnet block in the magnetic assembly at the lower end of the cold screen 4 faces the substrate 3 below, and the S pole of the arc-shaped magnetic strip in the magnetic assembly at the lower end of the cold screen 4 faces the substrate 3 below.

[0066] The cold shield 4 is formed by pressing it into a mold pre-placed with a magnet assembly. The magnet assembly at the bottom of the cold shield (near the substrate) consists of a centrally located square magnet block and curved magnetic strips. The north pole of the square magnet at the bottom of the cold shield 4 faces downward, creating a repulsive force with the upward-facing north pole of the square magnet at the center of substrate 3. The south poles of the curved magnets at the bottom of the cold shield 4 all face downward, creating an attractive force with the upward-facing north pole of the curved magnets on substrate 3. This allows the cold shield 4 to float above substrate 3, creating a suspension gap between them.

[0067] Furthermore, the components to be stacked also include a filter 9; a group of magnetic components are also provided at the upper end of the cold screen 4, the magnet component at the upper end of the cold screen includes a plurality of arc-shaped magnetic strips forming a ring, and the magnetic component of the filter includes a plurality of arc-shaped magnetic strips forming a ring;

[0068] When the filter 9 is suspended and stacked above the cold shield 4, the arc-shaped magnetic strips at the upper end of the cold shield 4 and the arc-shaped magnetic strips on the filter 9 are opposite to each other in vertical direction, and the upward polarity of the arc-shaped magnetic strips at the upper end of the cold shield 4 and the downward polarity of the arc-shaped magnetic strips on the filter 9 are the same.

[0069] The arc-shaped magnetic strip at the upper end of the cold shield 4 (close to the filter) can have either the S pole or the N pole facing downward. If the S pole faces downward, the N pole faces upward, and the N pole of the arc-shaped magnet of the filter faces downward to form a mutual repulsion force. If the N pole of the arc-shaped magnetic strip at the upper end of the cold shield 4 faces downward, the S pole faces upward, and the S pole of the corresponding arc-shaped magnet of the filter faces downward to form a mutual repulsion force.

[0070] Specifically, the magnet assemblies of the transition plate 2 , the base plate 3 , the upper end of the cold shield 4 , and the lower end of the cold shield 4 each have at least three arc-shaped magnets.

[0071] Specifically, a groove is formed on the filter 9 by milling or laser processing, and three arc-shaped magnetic strips are embedded in the groove to form the magnet assembly of the filter.

[0072] Furthermore, the local magnetic tooling 5 has a plurality of suspension points, each of which corresponds to a type of component;

[0073] In step A2, all components to be stacked of a package are captured by a superconducting capturer 6 to corresponding suspension points of the local magnetic tooling 5;

[0074] In step A3 , the local magnetic tooling 5 suspending all the components to be stacked is transferred to a vacuum degassing device, which performs vacuum treatment on all the components to be stacked simultaneously.

[0075] The local magnetic fixture 5 forms multiple suspension points, which can simultaneously suspend and carry multiple parts, and send the parts into the vacuum degassing equipment for vacuum treatment at one time, thus shortening the packaging time and improving the packaging efficiency. Figure 8 As shown, the transition plate, base plate and cold screen are all transferred to the corresponding suspension points of the local magnetic tooling 5.

[0076] For different parts, the magnets of the local magnetic fixture 5 are placed differently. For the transition block, substrate and cold screen, according to the principle that the fixture forms attraction around the parts and repulsion in the middle, such as Figure 5 As shown, the magnets of the tooling are arranged. For example, Figure 4 As shown, at the levitation point of the transition block 2, the four magnets on the fixture all face N-pole upwards, because the magnets on the transition block 2 are arranged as follows: the three arc-shaped magnets face S-pole downwards, and the middle square magnet faces N-pole downwards. For the levitation point of the substrate 3, the central magnet block faces S-pole upwards, while the surrounding arc-shaped magnets face N-pole upwards, because the S-pole of the magnet block of the substrate 3 faces S-pole downwards, and the S-pole of the arc-shaped magnets faces S-pole downwards. For the levitation point of the cold screen, the central magnet block faces N-pole upwards, while the surrounding arc-shaped magnets face N-pole upwards, because the N-pole of the magnet block in the magnetic assembly at the lower end of the cold screen 4 faces N-pole downwards, and the S-pole of the arc-shaped magnetic strip in the magnetic assembly at the lower end of the cold screen 4 faces S-pole downwards.

[0077] The local magnetic tooling 5 is slowly moved and placed into the vacuum degassing equipment to perform vacuum treatment on the parts.

[0078] Furthermore, in step A4, all components to be stacked are sequentially transferred and stacked onto the cold stage 1 using the superconducting catcher 6 to form a suspended stacking structure.

[0079] In step A5, glue 10 is injected into each suspension gap in the suspension stack structure at the same time, and then placed in an oven for curing to form a packaging structure.

[0080] like Figure 9 As shown, in B-1, the transition plate 2 is suspended and stacked onto the cold finger 7. In B-2, the base plate 3 is suspended and stacked onto the transition plate 2, and the cold shield 4 is suspended and stacked onto the base plate 3. In B-3, glue 10 is injected into each suspension gap. The glue injected into different suspension gaps can be different.

[0081] Because magnetic control technology can precisely control the spacing between components, the glue will not be very thin on one side and very thick on the other. Therefore, glue guns 11 can be used simultaneously to inject glue 10 into each suspended gap, achieving simultaneous glue injection and curing between components, reducing the static curing process time. Due to the precise control of the spacing between components, the position calibration process is reduced, greatly improving the Dewar packaging efficiency. The improved packaging efficiency and reduced packaging time greatly reduce the risk of Dewar surface contamination and significantly improve the Dewar's vacuum reliability.

[0082] In addition, since infrared electromagnetic waves are not sensitive to magnetic fields, the application of magnetic levitation technology has almost no effect on the imaging effect of infrared detectors.

[0083] Furthermore, in step A2, after the superconducting catcher 6 catches the component to the corresponding suspension point of the local magnetic tooling 5, the high magnetic permeability silicon steel 8 is inserted between the superconducting head and the component, and then the superconducting catcher 6 is removed.

[0084] After the parts are ultrasonically cleaned, use the superconducting catcher 6 to approach the parts, and then pour liquid nitrogen into the superconducting catcher 6 to cool the superconducting head 62 to the superconducting state. The parts are pinned and move synchronously with the superconducting catcher 6. The parts are moved to the corresponding suspension point of the local magnetic tooling 5, and the high magnetic permeability silicon steel 8 is inserted between the superconducting catcher 6 and the parts to weaken the pinning effect. At this time, the magnetic effect between the tooling and the parts is stronger, and the superconducting catcher 6 can be removed, and then the high magnetic permeability silicon steel 8 can be removed to complete the transfer of the parts. Figure 8 As shown, in step A-1, the superconducting catcher 6 captures the component. In step A-2, the superconducting catcher 6 carries the component to the corresponding levitation point of the local magnetic tooling 5. In step A-3, the high-permeability silicon steel 8 is inserted. In step A-4, the superconducting catcher 6 is removed, and then the high-permeability silicon steel 8 is removed.

[0085] The superconducting catcher 6 is removed after transferring the parts to the local magnetic fixture 5, and the superconducting catcher 6 is removed after transferring the parts to the top of the cold stage 1, in the same way, both using high magnetic permeability silicon steel 8. Figure 7 As shown, after the superconducting catcher 6 transfers the transition block 2 to the top of the cold stage of the cold finger, the high magnetic permeability silicon steel 8 is inserted between the superconducting head 62 and the transition block 2, and then the superconducting catcher 6 is removed.

[0086] The above are only preferred embodiments of the present invention and do not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A superconducting trap, characterized in that: The superconducting capturer includes a flow guide and a superconducting head at the lower end of the flow guide. The upper end of the flow guide is a backflow inlet. The fluid introduced by the flow guide cools the superconducting head. After cooling, the superconducting head becomes a superconducting state to perform non-contact capture of magnetic components.

2. A superconducting trap according to claim 1, characterized in that: The deflector is provided with a handle.

3. A method for magnetically levitating and packaging internal components of a dewar, used in a refrigerated infrared detector, characterized in that: Using a superconducting trap as claimed in any one of claims 1 to 2, and pre-arranging a magnet assembly in a cold stage and components to be stacked so that both the cold stage and the components have local magnetism, comprising the following packaging steps: Step A1, preparing a superconducting catcher and a local magnetic tooling, wherein the local magnetism of the local magnetic tooling forms a suspension point, and the superconducting catcher performs non-contact capture of the component; Step A2: using the superconducting catcher to catch the component to the suspension point corresponding to the local magnetic tooling, and the component is suspended above the suspension point corresponding to the local magnetic tooling; Step A3, transferring the local magnetic tooling with the component suspended thereon to a vacuum degassing device, wherein the vacuum degassing device performs a vacuum treatment on the component; Step A4, using the superconducting catcher to transfer the component on the local magnetic tooling to the cold stage, so that the cold stage and the magnet assembly of the component form a suspended stacking structure; Step A5: inject glue into the suspension gap of the suspended stack structure, and place it in an oven for curing to form a packaging structure.

4. The method for magnetically levitation packaging of internal components of a dewar according to claim 3, characterized in that: The magnetic component of the cold stage is embedded in the cold stage, and the magnet component of the cold stage includes a magnet block, and the S pole of the magnet block is arranged downward; The components to be stacked include a transition block, a magnet block on the transition block, and arc-shaped magnetic strips arranged around the magnet block. When the transition block is suspended and stacked above the cold stage, the magnet block of the transition block and the magnet block of the cold stage are opposite to each other in vertical direction. The S pole of the arc-shaped magnetic strip of the transition block faces the cold stage below, and the N pole of the magnet block of the transition block faces the cold stage below.

5. The method for magnetically levitation packaging of internal components of a dewar according to claim 4, characterized in that: The components to be stacked further include a substrate, and the magnet assembly of the transition block includes a magnet block and arc-shaped magnetic strips arranged around the magnet block; When the substrate is suspended and stacked above the transition block, the magnet block on the substrate and the magnet block of the transition block are opposite to each other up and down, the arc-shaped magnetic strips of the substrate and the arc-shaped magnetic strips of the transition block are opposite to each other up and down, the S pole of the magnet block of the substrate faces the transition block below, and the S pole of the arc-shaped magnetic strips of the substrate faces the transition block below.

6. The method for magnetically levitation packaging of internal components of a dewar according to claim 5, characterized in that: The components to be stacked also include a cold screen, wherein a group of magnetic components are provided at the lower end of the cold screen, and the magnet components of the cold screen include a magnet block and arc-shaped magnetic strips arranged around the magnet block; When the cold screen is suspended and stacked above the substrate, the magnet block at the lower end of the cold screen and the magnet block on the substrate are opposite to each other up and down, the arc-shaped magnetic strip at the lower end of the cold screen and the arc-shaped magnetic strip on the substrate are opposite to each other up and down, the N pole of the magnet block in the magnetic assembly at the lower end of the cold screen faces the substrate below, and the S pole of the arc-shaped magnetic strip in the magnetic assembly at the lower end of the cold screen faces the substrate below.

7. The method for magnetically levitation packaging of internal components of a dewar according to claim 6, characterized in that: The components to be stacked also include a filter. The upper end of the cold screen is further provided with a group of magnetic components. The magnet component at the upper end of the cold screen includes a plurality of arc-shaped magnetic strips forming a ring. The magnetic component of the filter includes a plurality of arc-shaped magnetic strips forming a ring. When the filter is suspended and stacked above the cold screen, the arc-shaped magnetic strip at the upper end of the cold screen and the arc-shaped magnetic strip on the filter are opposite to each other in vertical direction, and the upward polarity of the arc-shaped magnetic strip at the upper end of the cold screen is the same as the downward polarity of the arc-shaped magnetic strip on the filter.

8. The method for magnetically levitation packaging of internal components of a dewar according to claim 3, characterized in that: The local magnetic tooling has a plurality of suspension points, each of which corresponds to a type of component; In step A2, all the components to be stacked of a package are captured by the superconducting capturer at the corresponding suspension points of the local magnetic tooling; In step A3, the partial magnetic fixture on which all the components to be stacked are suspended is transferred to a vacuum degassing device, and the vacuum degassing device performs vacuum treatment on each component to be stacked simultaneously.

9. The method for magnetically levitation packaging of internal components of a dewar according to claim 3, characterized in that: In step A4, all the components to be stacked are sequentially transferred and stacked onto the cold stage using the superconducting catcher to form a suspended stacking structure; In step A5, glue is injected into each suspension gap in the suspension stack structure at the same time, and then placed in an oven for curing to form a packaging structure.

10. The method for magnetically levitation packaging of internal components of a dewar according to claim 3, characterized in that: In step A2, after the superconducting catcher catches the component to the corresponding suspension point of the local magnetic tooling, high magnetic permeability silicon steel is inserted between the superconducting head and the component, and then the superconducting catcher is removed.

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