A double-stage metal-sealed magnetic shielding encapsulation can

Abstract

The present invention relates to a two-stage metal-sealed anti-magnetic packaging can, which comprises an inner cover, an outer cover and a sealed tank body. The centers of the inner cover and the outer cover are connected by a rotary positioning component so that the outer cover can rotate relative to the inner cover; one end of the sealed tank body in the axial direction is an open structure, and the other end in the axial direction is a plugging structure; a first annular cylinder is provided at the open structure, one end of the first annular cylinder is connected to the outer side wall at the open structure through a connecting ring, an external thread is provided on the outer side wall of the first annular cylinder, and an annular sealing piece is also provided at the open structure; a second annular cylinder adapted to the first annular cylinder is provided on the circumferential side of the outer cover, and an internal thread adapted to the external thread is provided on the inner side wall of the second annular cylinder; a sealing cylinder is provided on the circumferential side of the inner cover, the sealing cylinder is located inside the second annular cylinder, and the outer side wall of the sealing cylinder is in sealing cooperation with the inner side wall of the first annular cylinder; an annular sealing ring groove is provided on the inner side wall of the inner cover, soft metal is filled in the sealing ring groove, and the annular sealing piece is inserted into the soft metal in the sealing ring groove.

Description

Technical Field

[0001] The present invention relates to the field of aerospace technology, and particularly to a two-stage metal-sealed anti-magnetic packaging canister. Background Art

[0002] The sample packaging canister is an important guarantee for completing the sampling of extraterrestrial celestial body samples and returning them to the Earth. The sealing performance of the sealed canister directly determines the purity of the samples inside the canister. The higher the sample purity, the closer the research results are to the real environment of extraterrestrial celestial bodies.

[0003] In the exploration of extraterrestrial celestial bodies by various countries, many sampling return missions have been carried out. However, the extraterrestrial celestial body environment, the geological conditions of the samples collected, the complexity of the sampling process, and the duration are all different. In different missions, the manned situation is also different. Therefore, it is impossible to ensure the general applicability of the sealed canister under different circumstances.

[0004] Some existing sealed canisters adopt a single-stage metal seal pair solution, which has very high requirements for metal processing accuracy. In addition, there is also a solution that uses two split lids for sealing, that is, an inner lid for deformation sealing and a gland for pressing. However, this sealing method is not easy to store during transportation, the sealing process is relatively complex, and this sealing method requires a relatively large pressure and is only applicable to automatic sealing in a mechanical unmanned situation. Summary of the Invention

[0005] In order to solve one or several of the technical problems existing in the prior art, the present invention provides a two-stage metal-sealed anti-magnetic packaging canister.

[0006] The technical solution of the present invention to solve the above technical problems is as follows: A double-stage metal-sealed anti-magnetic packaging can, comprising an inner cover, an outer cover and a sealed can body. The center of the inner cover is connected to the center of the outer cover through a rotation positioning component so that the outer cover can rotate relative to the inner cover; One end of the sealed can body in the axial direction is an open structure, and the other end is a sealing structure; A first annular cylinder is provided at the open structure. The inner diameter of the first annular cylinder is larger than the outer diameter of the sealed can body. One end of the first annular cylinder is connected to the outer side wall of the open structure of the sealed can body through a connecting ring. An external thread is provided on the outer side wall of the first annular cylinder. An annular sealing sheet is also provided at the open structure of the sealed can body; A second annular cylinder adapted to the first annular cylinder is provided on the periphery of the outer cover. An internal thread adapted to the external thread is provided on the inner side wall of the second annular cylinder; A sealing cylinder is provided on the periphery of the inner cover. The sealing cylinder is located inside the second annular cylinder and forms a space for accommodating the first annular cylinder between the sealing cylinder and the second annular cylinder. The outer side wall of the sealing cylinder is in sealing cooperation with the inner side wall of the first annular cylinder; An annular sealing ring groove is provided on the inner side wall of the inner cover. The sealing ring groove is filled with soft metal. The annular sealing sheet is inserted into the soft metal in the sealing ring groove.

[0007] The beneficial effects of the present invention are: For the double-stage metal-sealed anti-magnetic packaging can of the present invention, the outer side wall of the sealing cylinder is in sealing cooperation with the inner side wall of the first annular cylinder, and the sealing cooperation between the soft metal and the annular sealing sheet can ensure the reliability of the seal to the greatest extent.

[0008] On the basis of the above technical solution, the present invention can be further improved as follows.

[0009] Further, the annular sealing sheet extends towards the inner cover. The inner diameter of the annular sealing sheet is the same as the inner diameter of the sealed can body. The outer diameter of the annular sealing sheet gradually decreases in the direction approaching the inner cover.

[0010] The beneficial effect of adopting the above further solution is: The outer diameter of the annular sealing sheet gradually decreases in the direction approaching the inner cover, which is convenient for inserting the annular sealing sheet into the soft metal.

[0011] Further, a ring-shaped tip protrusion for inserting into the soft metal is provided at the free end of the annular sealing sheet.

[0012] The beneficial effect of adopting the above further solution is: By providing the ring-shaped tip protrusion, it is convenient to smoothly insert the annular sealing sheet into the soft metal.

[0013] Further, a receiving groove for accommodating part of the sealing cylinder and part of the soft metal is formed between the annular sealing sheet and the first annular cylinder.

[0014] The beneficial effect of adopting the above further solution is that by providing the accommodating groove, a certain escape space is provided for the sealing cylinder and the soft metal during the plugging process of the annular sealing sheet.

[0015] Furthermore, the outer side wall of the sealing cylinder is interference fit with the inner side wall of the first annular cylinder.

[0016] The beneficial effect of adopting the above further solution is that the outer wall of the sealing cylinder is interference-fitted with the inner wall of the first annular cylinder, which is beneficial to effective sealing between the sealing cylinder and the first annular cylinder.

[0017] Furthermore, the cross section of the sealing ring groove is a convex structure.

[0018] Furthermore, an anti-magnetic coating is provided on the outer surface of the sealed tank body, and a gas sensor is provided on the inner side wall of the open structure of the sealed tank body.

[0019] The beneficial effects of adopting the above further scheme are: the setting of the anti-magnetic coating can prevent magnetic interference when the double-stage metal sealed anti-magnetic packaging can returns to the earth, isolates the space radiation interference during the sampling and return process, achieves the purpose of anti-magnetic pollution, and guarantees the needs of subsequent paleomagnetism extraterrestrial sample dating.

[0020] Furthermore, a protrusion extending into the sealed tank body is provided at the center of the sealing structure of the sealed tank body, the top surface of the protrusion is a thin metal sheet with a thickness less than the tank wall thickness of the sealed tank body, and a spiral sealing plug is threadedly connected to the inner wall of the protrusion.

[0021] The beneficial effect of adopting the above further scheme is that when the double-stage metal sealed anti-magnetic packaging tank returns to the earth, the thin metal sheet can be punctured and the gas in the sealed tank body can be extracted from the protrusion.

[0022] Furthermore, the outer cover is a hollow structure.

[0023] The beneficial effect of adopting the above further solution is that while reducing weight, the hollowed-out part can also adapt to the clamping mechanism at the end of various robotic arms, making it convenient for the robotic arms to be tightened or opened.

[0024] Furthermore, the rotation positioning assembly includes a positioning piece and a thrust bearing. The center of the inner cover is connected to the center of the outer cover via the positioning piece. The thrust bearing is sleeved on the positioning piece and is respectively connected to the inner cover and the outer cover, so that the outer cover can rotate relative to the inner cover. A butterfly gasket is connected between the thrust bearing and the outer cover.

[0025] The beneficial effects of adopting the above further solution are as follows: The thrust bearing enables the outer cover to rotate relative to the inner cover. The axial anti-loosening design of the disc spring washer can withstand high impacts and return to the mechanical conditions. During the sampling return process of the double-stage metal-sealed anti-magnetic encapsulation can, when encountering severe vibrations, the pre-pressure stored when the disc spring washer is pressed is slowly released, which can ensure that there is no axial relative displacement between the inner cover and the sealed tank body, and ensure the continuous contact and sealing effect of the two-stage seal pair. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 FIG. is a schematic perspective view of the double-stage metal-sealed anti-magnetic encapsulation can of the present invention;

[0027] Figure 2 FIG. is a schematic front view of the double-stage metal-sealed anti-magnetic encapsulation can of the present invention;

[0028] Figure 3 is Figure 2 a schematic cross-sectional view taken along line B-B in

[0029] Figure 4 is Figure 3 an enlarged schematic view of part A in

[0030] Figure 5 is Figure 3 an enlarged schematic view of part B in

[0031] In the drawings, the list of components represented by each reference numeral is as follows:

[0032] 1, inner cover; 11, sealing cylinder; 12, sealing ring groove; 13, soft metal;

[0033] 2, outer cover; 21, second annular cylinder;

[0034] 3, sealed tank body; 31, first annular cylinder; 32, connecting ring; 33, annular sealing piece; 34, annular tip projection; 35, receiving groove; 36, projection; 37, thin metal sheet; 38, spiral sealing plug; 4, rotation positioning assembly; 41, thrust bearing; 42, positioning piece; 5, disc spring washer. DETAILED DESCRIPTION OF THE INVENTION

[0035] The principles and features of the present invention will be described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0036] As Figures 1 to 5As shown in the figure, a double-stage metal-sealed magnetic-proof packaging can of this embodiment includes an inner cover 1, an outer cover 2, and a sealed can body 3. The center of the inner cover 1 is connected to the center of the outer cover 2 through a rotation positioning assembly 4 so that the outer cover 2 can rotate relative to the inner cover 1; one end of the sealed can body 3 in the axial direction is an open structure, and the other end is a sealing structure; a first annular cylinder 31 is provided at the open structure. The inner diameter of the first annular cylinder 31 is larger than the outer diameter of the sealed can body 3. One end of the first annular cylinder 31 is connected to the outer side wall of the open structure of the sealed can body 3 through a connecting ring 32. An external thread is provided on the outer side wall of the first annular cylinder 31. An annular sealing sheet 33 is also provided at the open structure of the sealed can body 3; a second annular cylinder 21 adapted to the first annular cylinder 31 is provided on the periphery of the outer cover 2. An internal thread adapted to the external thread is provided on the inner side wall of the second annular cylinder 21; a sealing cylinder 11 is provided on the periphery of the inner cover 1. The sealing cylinder 11 is located inside the second annular cylinder 21 and forms a space for accommodating the first annular cylinder 31 between it and the second annular cylinder 21. The outer side wall of the sealing cylinder 11 is in sealing cooperation with the inner side wall of the first annular cylinder 31; an annular sealing ring groove 12 is provided on the inner side wall of the inner cover 1. A soft metal 13 is filled in the sealing ring groove 12. The annular sealing sheet 33 is inserted into the soft metal 13 in the sealing ring groove 12.

[0037] As Figure 3 and Figure 4 shown in the figure, the annular sealing sheet 33 of this embodiment extends towards the inner cover 1. The inner diameter of the annular sealing sheet 33 is the same as the inner diameter of the sealed can body 3. The outer diameter of the annular sealing sheet 33 gradually decreases in the direction of approaching the inner cover 1. The outer diameter of the annular sealing sheet gradually decreases in the direction of approaching the inner cover, which is convenient for inserting the annular sealing sheet into the soft metal.

[0038] As Figure 4 shown in the figure, the free end of the annular sealing sheet 33 of this embodiment is provided with an annular tip projection 34 for inserting into the soft metal 13. By providing the annular tip projection, it is convenient to smoothly insert the annular sealing sheet into the soft metal to form a knife-edge seal.

[0039] As Figure 3 and Figure 4 shown in the figure, a receiving groove 35 for accommodating part of the sealing cylinder 11 and part of the soft metal 13 is formed between the annular sealing sheet 33 and the first annular cylinder 31 of this embodiment. By providing the receiving groove, a certain avoidance space is provided for the sealing cylinder and the soft metal during the insertion process of the annular sealing sheet.

[0040] As Figure 4As shown, the outer sidewall of the sealing cylinder 11 in this embodiment is in interference fit with the inner sidewall of the first annular cylinder 31. Interference fitting the outer sidewall of the sealing cylinder with the inner sidewall of the first annular cylinder is conducive to effective sealing between the sealing cylinder and the first annular cylinder. Specifically, multiple uneven arc surface structures can be provided on the outer sidewall of the sealing cylinder 11, or multiple uneven arc surface structures can be provided on the inner sidewall of the first annular cylinder 31. The radian and the like can be simulated and designed to meet the interference sealing requirements during movement. Of course, other forms of interference fitting methods can also be used as long as they can meet the tight fitting and sealing requirements between the outer sidewall of the sealing cylinder 11 and the inner sidewall of the first annular cylinder 31.

[0041] As Figure 4 shown, the cross-section of the sealing ring groove 12 in this embodiment is a convex-shaped structure.

[0042] A further solution in this embodiment is that a layer of anti-magnetic coating is provided on the outer surface of the sealed tank body 3, and a gas sensor is provided on the inner sidewall of the open structure of the sealed tank body 3. The gas sensor is used for mass spectrometry analysis of the gas in the sealed tank body 3, and is also used to monitor the gas volatilization and leakage of the sample in the sealed tank body 3, as well as the air condition entering the sealed tank body 3 during the return process. The setting of the anti-magnetic coating can prevent magnetic interference during the return process of the double-stage metal-sealed anti-magnetic encapsulation tank to the earth, isolate the space radiation interference during sampling and return, achieve the purpose of anti-magnetic pollution, and ensure the subsequent requirements for dating extraterrestrial samples in paleomagnetism. Preferably, the anti-magnetic coating can adopt a permalloy coating.

[0043] As Figure 3 shown, a protrusion 36 extending into the sealed tank body 3 is provided at the central position of the plugging structure of the sealed tank body 3 in this embodiment. The top surface of the protrusion 36 is a thin metal sheet 37 with a thickness less than the wall thickness of the sealed tank body 3, and a spiral sealing plug 38 is threadedly connected to the inner sidewall of the protrusion 36. When the double-stage metal-sealed anti-magnetic encapsulation tank returns to the earth, it can be punctured from the thin metal sheet, and the gas in the sealed tank body can be extracted from the protrusion. Specifically, the thickness of the thin metal sheet 37 is 0.04 - 0.06 mm, preferably 0.05 mm. The spiral sealing plug 38 is a threaded structure with a rubber sealing gasket added, and is threadedly connected to the inner sidewall of the protrusion (that is, the outer sidewall of the sealed tank body 3) through threads to protect the integrity of the thin metal sheet during the sampling return process.

[0044] As Figures 1 to 3 shown, the outer cover 2 in this embodiment is a hollow structure. The setting of the hollow structure can reduce the weight, and at the same time, the hollow part can adapt to the clamping mechanisms at the ends of various robotic arms, facilitating the robotic arm to screw on and tighten or open.

[0045] As Figure 5As shown in the figure, a specific solution of this embodiment is that the rotation positioning assembly 4 includes a positioning member 42 and a thrust bearing 41. The center of the inner cover 1 is connected to the center of the outer cover 2 through the positioning member 42. The thrust bearing 41 is sleeved on the positioning member 42 and is respectively connected to the inner cover 1 and the outer cover 2, enabling the outer cover 2 to rotate relative to the inner cover 1. A disc spring 5 is connected between the thrust bearing 41 and the outer cover 2. The thrust bearing can realize the rotation of the outer cover relative to the inner cover. The axial anti-loosening design of the disc spring can withstand high-impact return mechanical conditions. During the sampling return process of the double-stage metal-sealed anti-magnetic encapsulation can, when encountering severe vibration, the pre-pressure stored when the disc spring is compressed is slowly released, which can ensure that there is no axial relative displacement between the inner cover and the sealed tank body, and ensure the continuous contact and sealing effect of the two-stage seal pair. Among them, the positioning member 42 can be a fastening screw. The fastening screw can be fixed on the inner cover 1, and the center of the outer cover 2 can be sleeved on the fastening screw, and the pre-tightening force between the outer cover 2 and the inner cover 1 is realized by relying on the thrust bearing and the disc spring.

[0046] In this embodiment, when the inner cover 1 and the outer cover 2 are assembled, the disc spring 5 can be compressed between the inner cover 1 and the outer cover 2. After the inner cover 1 and the outer cover 2 are assembled, they can only rotate relative to each other. When the outer cover 2 is rotated and tightened with the sealed tank body 3, the inner cover 1 also moves with the outer cover 2 and is tightly pressed and fitted with the sealed tank body 3.

[0047] When the double-stage metal-sealed anti-magnetic encapsulation can of this embodiment is in use, the assembly of the inner cover 1 and the outer cover 2 is buckled at the open structure of the sealed tank body 3, so that the first annular cylinder 31 is located between the sealed cylinder 11 and the second annular cylinder 21. Through the threaded fit between the second annular cylinder 21 and the first annular cylinder 31, during the process of tightening the outer cover 2 for sealing, the outer side wall of the sealed cylinder 11 contacts the inner side wall of the first annular cylinder 31 and forms friction and then stops rotating. The outer cover 2 continues to rotate downward. After pressing the inner cover 1 to the specified position, an interference fit is formed between the sealed cylinder 11 and the first annular cylinder 31. At the same time, the annular sealing piece 33 is inserted into the soft metal 13 in the sealing ring groove 12 to form a double-stage sealing form of a soft metal sealing ring - blade seal and a hard metal pair seal. After the double-stage metal-sealed anti-magnetic encapsulation can returns to the earth, the sealed tank body should be opened in a glove box environment. Unscrew the screw seal plug 38, use a probe to pierce the thin metal sheet 37 on the bottom protrusion of the sealed tank body, extract the gas in the sealed tank body 3, and after completing the extraction of the gas sample, use a manipulator to clamp the outer cover to open the sealed tank body to extract the solid sample.

[0048] In the double-stage metal-sealed anti-magnetic encapsulation can of this embodiment, the outer sidewall of the sealing cylinder is in sealing cooperation with the inner sidewall of the first annular cylinder, and the sealing cooperation between the soft metal and the annular sealing sheet can ensure the reliability of the seal to the greatest extent. The double-stage metal-sealed anti-magnetic encapsulation can of this embodiment can achieve the double-seal compression through a screwing action, and the sealing process is simpler and more convenient to operate.

[0049] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and 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 should not be construed as a limitation of the present invention.

[0050] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0051] In the present invention, unless otherwise clearly specified and limited, the terms "mounted", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] In the present invention, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may be that the first feature is directly above or obliquely above the second feature, or simply indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or simply indicates that the first feature has a lower horizontal height than the second feature.

[0053] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0054] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A two-stage metal-sealed anti-magnetic packaging can, characterized in that, It includes an inner cover, an outer cover and a sealed tank body. The center of the inner cover is connected to the center of the outer cover through a rotation positioning component so that the outer cover can rotate relative to the inner cover; One end of the sealed tank body in the axial direction is an open structure, and the other end is a plugging structure; A first annular cylinder is provided at the open structure. The inner diameter of the first annular cylinder is larger than the outer diameter of the sealed tank body. One end of the first annular cylinder is connected to the outer side wall of the open structure of the sealed tank body through a connecting ring. External threads are provided on the outer side wall of the first annular cylinder. An annular sealing sheet is also provided at the open structure of the sealed tank body; A second annular cylinder adapted to the first annular cylinder is provided on the circumferential side of the outer cover. Internal threads adapted to the external threads are provided on the inner side wall of the second annular cylinder; A sealing cylinder is provided on the circumferential side of the inner cover. The sealing cylinder is located inside the second annular cylinder and forms a space for accommodating the first annular cylinder between it and the second annular cylinder. The outer side wall of the sealing cylinder is in sealing cooperation with the inner side wall of the first annular cylinder; An annular sealing ring groove is provided on the inner side wall of the inner cover. The sealing ring groove is filled with soft metal. The annular sealing sheet is inserted into the soft metal in the sealing ring groove; A protrusion extending into the sealed tank body is provided at the center position of the plugging structure of the sealed tank body. The top surface of the protrusion is a thin metal sheet with a thickness less than the wall thickness of the sealed tank body. A spiral sealing plug is threadedly connected to the inner side wall of the protrusion.

2. The two-stage metal-sealed anti-magnetic packaging can according to claim 1, characterized in that, The annular sealing sheet extends towards the inner cover. The inner diameter of the annular sealing sheet is the same as the inner diameter of the sealed tank body. The outer diameter of the annular sealing sheet gradually decreases in the direction of approaching the inner cover.

3. The two-stage metal-sealed anti-magnetic packaging can according to claim 1, characterized in that, The free end of the annular sealing sheet is provided with an annular tip protrusion for inserting into the soft metal.

4. The two-stage metal-sealed anti-magnetic packaging can according to claim 1, characterized in that, A space for accommodating part of the sealing cylinder and part of the soft metal is formed between the annular sealing sheet and the first annular cylinder.

5. The two-stage metal-sealed anti-magnetic packaging can according to claim 1, characterized in that, The outer side wall of the sealing cylinder is in interference fit with the inner side wall of the first annular cylinder.

6. The two-stage metal-sealed anti-magnetic packaging can according to claim 1, characterized in that, The cross-section of the sealing ring groove is a convex-shaped structure.

7. The two-stage metal-sealed anti-magnetic packaging can according to claim 1, characterized in that, A layer of anti-magnetic coating is provided on the outer surface of the sealed tank body. A gas sensor is provided on the inner side wall of the open structure of the sealed tank body.

8. The two-stage metal-sealed anti-magnetic packaging can according to claim 1, characterized in that, The outer cover is a hollow structure.

9. The two-stage metal-sealed anti-magnetic packaging can according to claim 1, characterized in that, The rotation positioning component includes a positioning part and a thrust bearing. The center of the inner cover is connected to the center of the outer cover through the positioning part. The thrust bearing is sleeved on the positioning part and is respectively connected to the inner cover and the outer cover, enabling the outer cover to rotate relative to the inner cover; A butterfly gasket is connected between the thrust bearing and the outer cover.

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