CN107564658B - Heat shield layer, method for manufacturing the same, cryostat, and mold set - Google Patents
Heat shield layer, method for manufacturing the same, cryostat, and mold set Download PDFInfo
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- CN107564658B CN107564658B CN201710906373.9A CN201710906373A CN107564658B CN 107564658 B CN107564658 B CN 107564658B CN 201710906373 A CN201710906373 A CN 201710906373A CN 107564658 B CN107564658 B CN 107564658B
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Abstract
The invention relates to a thermal shield and a method of manufacturing the same, a cryostat with the thermal shield and a mould set for making the thermal shield. The heat shielding layer comprises an inner cylinder, an outer cylinder, a seal head and a connecting part; the outer cylinder is sleeved outside the inner cylinder; the end socket is arranged between the inner cylinder and the outer cylinder and is positioned at the end part of the inner cylinder, the end socket is connected with the inner cylinder and the outer cylinder, the edge of the end socket, which is contacted with the inner cylinder, is a first edge, and the edge of the end socket, which is contacted with the outer cylinder, is a second edge; the connecting part is arranged on the first edge and/or the second edge; the connecting part is inclined relative to the end enclosure; the number of the connecting parts is multiple, and the connecting parts are distributed along the circumferential direction of the end enclosure; gaps are formed between the adjacent connecting parts. The heat shield layer is simple to manufacture, low in cost and low in edge stress.
Description
Technical Field
The present invention relates to the field of superconducting magnet technology, and more particularly, to a thermal shield and a method for manufacturing the same, a cryostat having the thermal shield, and a mold set for manufacturing the thermal shield.
Background
In the superconducting magnet structure, a superconducting wire wound in a wire slot of a bobbin is sheathed in an inner container of a hollow cylindrical low-temperature holder. The inner container is filled with low-temperature medium (such as liquid helium) which submerges the superconducting coil to keep the superconducting coil in a low-temperature superconducting state, and the coil generates a stable strong magnetic field after excitation.
To insulate against external thermal radiation and maintain the cryogenic environment inside, the cryostat is typically assembled from multiple concentric cylindrical chambers, an inner vessel, a thermal shield and an outer vacuum vessel, in that order from the inside out. The heat shield layer can reflect external heat radiation, provides one-stage or multi-stage heat cutoff and effectively isolates external environment from heat leakage to the interior.
The heat shield layer comprises a cylindrical inner cylinder, a cylindrical outer cylinder concentrically sleeved outside the inner cylinder and annular seal heads arranged between the inner cylinder and the outer cylinder and respectively fixed with the inner cylinder and the outer cylinder. In general, in order not to increase the overall length of the cryostat, it is necessary to maintain the relative spacing between the thermal shield and the inner and outer vessels as much as possible, so that the annular head of the thermal shield is also required to have an approximately smooth transition so that the barrel is connected smoothly with the head corners.
For heads with "smooth transition" structures, a "spinning" or "stamping" process is typically employed. Corresponding dies and tools are needed to be manufactured for spinning or punching the large-size end socket, and the tools are expensive and have long processing period. Meanwhile, metal plate stamping usually has resilience, so that resilience control is difficult, one-time stamping design often cannot meet requirements, and the die needs to be repaired for many times. Making the manufacture of the thermal barrier layer difficult.
Disclosure of Invention
Based on this, it is necessary to provide a thermal shield and a method of manufacturing the same, a cryostat having the thermal shield, and a mold set for manufacturing the thermal shield, in view of the problem of how to facilitate the manufacture of the thermal shield.
A thermal shield, comprising:
an inner barrel;
the outer cylinder is sleeved outside the inner cylinder;
the end socket is arranged between the inner cylinder and the outer cylinder and is positioned at the end part of the inner cylinder, the end socket is connected with the inner cylinder and the outer cylinder, the edge of the end socket, which is contacted with the inner cylinder, is a first edge, and the edge of the end socket, which is contacted with the outer cylinder, is a second edge; and
the connecting part is arranged on the first edge and/or the second edge and is used for connecting the inner cylinder and the seal head and/or the outer cylinder and the seal head; the connecting part is inclined relative to the end enclosure; the number of the connecting parts is multiple, and the connecting parts are distributed along the circumferential direction of the end enclosure; gaps are formed between the adjacent connecting parts.
Above-mentioned heat shield, the urceolus is established outside the inner tube with the concentric cover, the head sets up between inner tube and urceolus, inner tube and urceolus are connected to the head, the head is located the tip of inner tube, the limit that contacts between head and the inner tube is first border, the limit that the head contacted with the urceolus is the second border, first border and/or second border are provided with connecting portion, the relative head of connecting portion is the tilt state, the quantity of connecting portion is a plurality of, a plurality of connecting portion are connected and are distributed along circumference, the clearance has between the adjacent connecting portion, through seting up the clearance between adjacent connecting portion, make required power such as the bending of connecting portion reduce, thereby be convenient for the installation of connecting portion, and then the manufacturing of the heat shield of being convenient for, and connecting portion slope towards the direction at head place, make inner tube or urceolus and.
In one embodiment, the connecting portion is formed by extending from an outer edge of the sealing head close to the outer cylinder, and the connecting portion is bent towards the outer cylinder, so that the connecting portion is connected with the edge of the outer cylinder.
In one embodiment, the connecting portion is formed by extending from an edge of the outer cylinder, and the connecting portion is bent toward the inner cylinder, so that the connecting portion is connected with an outer edge of the sealing head, which is close to the outer cylinder.
In one embodiment, the connecting part is detachably connected with the edge of the outer cylinder, and the connecting part is detachably connected with the outer edge of the seal head close to the outer cylinder.
In one embodiment, the maximum width of the gap in a direction perpendicular to the radial direction of the inner cylinder and perpendicular to the direction of the central axis of the inner cylinder is greater than or equal to 1 mm and less than or equal to 20 mm.
In one embodiment, the adhesive layer is used for covering the gap.
A cryostat for a superconducting magnet structure, the cryostat comprising an inner vessel, an outer vacuum vessel and the above thermal shield, the thermal shield being concentrically nested outside the inner vessel, the outer vacuum vessel being concentrically nested outside the thermal shield.
The low-temperature retainer is convenient to manufacture and low in cost.
A mold set for the above heat shield includes a first mold having a first inclined surface and a second mold having a second inclined surface adapted to the first inclined surface, the first mold and the second mold being used to form the connecting portion.
The die set is simple in structure and low in cost.
A method of making a thermal shield comprising the steps of:
the end socket is provided with a plurality of gaps, the gaps extend to the outer edge of the end socket, a connecting part is limited between the adjacent gaps, and the width of the gaps in the direction perpendicular to the radial direction of the end socket and the direction perpendicular to the central axis of the end socket is gradually increased from the outer edge of the end socket to the edge direction of the outer cylinder;
bending the connecting part towards the direction of the outer cylinder under the action of pressure;
and connecting the edge of the connecting part far away from the connecting part with the edge of the outer barrel.
A method of making a thermal shield comprising the steps of:
the outer cylinder is provided with a plurality of gaps, the gaps extend to the edge of the outer cylinder, a connecting part is defined between every two adjacent gaps, and the width of each gap in the direction perpendicular to the radial direction of the outer cylinder and the direction perpendicular to the central axis of the outer cylinder is gradually increased from the edge of the outer cylinder to the end socket;
bending the connecting part towards the direction of the seal head under the action of pressure;
and connecting the edge of the connecting part far away from the connecting part with the outer edge of the seal head.
The manufacturing method of the heat shielding layer is simple in manufacturing process and can reduce manufacturing cost.
Drawings
FIG. 1 is a schematic structural view of a thermal shield according to an embodiment;
FIG. 2 is an enlarged view of a portion of A shown in FIG. 1;
FIG. 3 is a cross-sectional view of the thermal shield shown in FIG. 1 in a central cross-section;
FIG. 4 is a schematic view of the connection portion shown in FIG. 3 extending from the closure;
FIG. 5 is a cross-sectional view of another embodiment of the thermal shield shown in FIG. 1 in a central cross-section;
FIG. 6 is a schematic view of the detachable connection of the connection part and the sealing head and the outer cylinder shown in FIG. 1
FIG. 7 is a partial enlarged view of B shown in FIG. 4;
FIG. 8 is a schematic view of one embodiment of a die set for use with a thermal shield.
Detailed Description
As mentioned in the background, the conventional "spinning" or "stamping" process is usually used for the closure head with "smooth transition" structure, and the manufacturing process is complicated.
Through further research, in one embodiment, a thermal shield is provided and includes an inner tube, an outer tube, a sealing head and a connecting portion, wherein the outer tube is concentrically sleeved outside the inner tube. The end enclosure is arranged between the inner cylinder and the outer cylinder and is positioned at the end part of the inner cylinder, the end enclosure is connected with the inner cylinder and the outer cylinder, the edge of the end enclosure, which is contacted with the inner cylinder, is a first edge, and the edge of the end enclosure, which is contacted with the outer cylinder, is a second edge. The first edge and/or the second edge are/is provided with a connecting part, and the connecting part inclines towards the direction of the end enclosure. The connecting parts are distributed along the circumferential direction, and gaps are formed between every two adjacent connecting parts.
Further, a cryostat for a superconducting magnet structure is provided, the cryostat comprising an inner vessel, an outer vacuum vessel and a thermal shield, the thermal shield being concentrically mounted outside the inner vessel and the outer vacuum vessel being concentrically mounted outside the thermal shield.
Further, a mold set is provided based on the heat shield layer, and includes a first mold and a second mold, the first mold has a first inclined surface, the second mold has a second inclined surface matched with the first inclined surface, and the first mold and the second mold are used for forming the connecting portion.
Further, a method of manufacturing a thermal shield is provided.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
As shown in fig. 1, a thermal shield 100 of an embodiment includes an inner tube 110, an outer tube 120, a head 130, and a connecting portion 140. The thermal shield 100 is used in a cryostat. The outer cylinder 120 is sleeved outside the inner cylinder 110. The head 130 is disposed between the inner cylinder 110 and the outer cylinder 120, and the head 130 connects the inner cylinder 110 and the outer cylinder 120. The end sockets 130 are located at the ends of the inner cylinder 110, that is, the end sockets 130 are provided at both ends of the inner cylinder 110. Among them, in order to obtain good heat conduction and heat shielding performance, the material used for the heat shield layer 100 is an aluminum alloy. It should be noted that the material used for the thermal barrier layer 100 may be other materials having thermal conductivity. In addition, in one embodiment, the outer cylinder 120 is concentrically disposed over the inner cylinder 110.
The edge of the sealing head 130 contacting the inner cylinder 110 is a first edge, and the edge of the sealing head 130 contacting the outer cylinder 120 is a second edge. The connecting portion 140 is disposed at the first edge and/or the second edge, and the connecting portion 140 is inclined with respect to the sealing head 130. The number of the connecting parts 140 is plural, the connecting parts 140 are distributed along the circumferential direction of the end socket 130, and a gap is formed between the adjacent connecting parts 140. It should be noted that the plurality of connecting portions 140 may be uniformly distributed along the circumferential direction of the sealing head 130.
Referring to fig. 1 and 2 again, taking the example that the second edge is provided with the connecting portion 140, the connecting portion 140 connects the edge of the outer cylinder 120 and the outer edge of the sealing head 130 close to the outer cylinder 120. The connecting portion 140 is inclined toward the direction of the end socket 130, and the connecting portion 140 is inclined with respect to the end socket 130. The number of the connecting parts 140 is multiple, the connecting parts 140 are distributed along the circumferential direction, and gaps 141 are formed between the adjacent connecting parts 140.
In one embodiment, as shown in FIG. 1, the seal head 130 includes a central surface 131, the outer cylinder 120 includes a cylindrical surface 121, the central surface 131 of the seal head 130 is substantially perpendicular or approximately perpendicular to the cylindrical surface 121 of the outer cylinder 120 in a central cross-section, wherein the central cross-section is a cross-section passing through the central axis of the inner cylinder 110, such that in the central cross-section, the central surface of the seal head 130 and the cylindrical surface of the outer cylinder 120 form a non-right angle transition, as shown in FIG. 3.
The non-right-angle transition structure can be a fillet, a chamfer or other lace structures, so that the joint of the inner cylinder 110 or the outer cylinder 120 and the seal head 130 is smooth, smooth transition is formed, edge stress between the inner cylinder or the outer cylinder and the seal head is reduced, the thickness of the seal head, the inner cylinder and the outer cylinder is reduced, and the cost is reduced. In addition, when the thermal shield 100 is used in a cryostat, the thermal shield 100 cooperates with the inner and outer vessels to keep the relative gap between the multiple vessels small, thereby reducing the length of the cryostat and improving the claustrophobic effect of the magnetic resonance apparatus.
In one embodiment, the surface of the connection part 140 in a direction perpendicular to the radial direction of the inner tube 110 and perpendicular to the direction of the central axis of the inner tube 110 is a plane or an arc surface. So that the connection between the sealing head 130 and the inner cylinder 110 or the outer cylinder 120 forms a non-right-angle transition structure. Further, as shown in fig. 2, the width d of the connection part 140 in a direction perpendicular to the radial direction of the inner cylinder 110 and perpendicular to the direction of the central axis of the inner cylinder 110 may be 20 to 300 mm, so that the sealing head 130 may be well fitted to the inner cylinder 110 or the outer cylinder 120 in the circumferential direction.
Referring again to fig. 3, in one embodiment, the connection part 140 is formed to extend from an outer edge of the cap 130 near the outer cylinder 120, and the connection part 140 is bent in a direction of the outer cylinder 120 so that the connection part is connected to the edge of the outer cylinder 120. On the central section, a non-right-angle transition structure is formed between the central surface of the end socket 130 and the cylindrical surface of the outer cylinder 120. As shown in fig. 4, the sealing head 130 and the connecting portion 140 may be integrally formed, and a gap 141 is formed between adjacent connecting portions 140. Wherein, the connection part 140 may be connected with the edge of the outer cylinder 120 by welding or riveting. When the connection portions 140 are formed by extending from the outer edge of the sealing head 130 close to the outer tube 120, the connection portions 140 are bent outward due to the gaps between the adjacent connection portions 140, so that the connection portions 140 are connected to the edge of the outer tube 120, and thus the heat shield 100 is simpler to manufacture and the cost is reduced.
Referring to fig. 5, in one embodiment, the connection portion 240 is formed to extend from an edge of the outer cylinder 220, and the connection portion 240 is bent in a direction of the inner cylinder, so that the connection portion 240 is connected to an outer edge of the cap 230 near the outer cylinder 220. On the central section, a non-right-angle transition structure is formed between the central surface of the end socket 230 and the cylindrical surface of the outer cylinder 220. The connecting portion 240 may be connected to an outer edge of the sealing head 230 by welding or riveting. When the connection parts 240 are formed to extend from the edge of the outer tub 220, since the adjacent connection parts 240 have a gap therebetween, it is convenient to bend the connection parts 240, so that the connection parts 240 are connected with the outer edge of the header 230, thereby making the manufacture of the heat shield simpler and also reducing the cost.
In one embodiment, as shown in fig. 6, the connecting portion 340 is detachably connected to the edge of the outer cylinder 320, and the connecting portion 340 is detachably connected to the outer edge of the sealing head 330 near the outer cylinder 320. The connecting portion 34 may be connected to the outer edge of the sealing head 230 by welding or riveting, and the connecting portion 340 may also be connected to the edge of the outer cylinder 320 by welding or riveting. It should be noted that the connecting portion 340 may be connected to the outer edge of the sealing head 230 in other detachable manners such as clamping, and the connecting portion 340 may also be connected to the edge of the outer cylinder 320 in other detachable manners such as clamping. When the connecting portion 340 is detachably connected to the edge of the outer cylinder 320 and the outer edge of the end socket 330 close to the outer cylinder 320, a gap is formed between the connecting portions, so that welding and the like are facilitated, the process requirement is reduced, the manufacturing of the heat shield layer is simpler, and the cost can be reduced.
In one embodiment, in order to facilitate bending formation of the connection portion, the width of the gap in a direction perpendicular to the radial direction of the inner cylinder and perpendicular to the direction of the central axis of the inner cylinder is gradually increased from the edge of the end socket toward the edge of the inner cylinder or the outer cylinder before bending formation. Taking the example where the second edge is provided with the connecting portion extending from the edge of the head close to the outer cylinder, as shown in fig. 7, the width of the gap 141 in the direction perpendicular to the radial direction of the inner cylinder and perpendicular to the direction of the central axis of the inner cylinder gradually increases from the edge of the head 130 toward the edge of the outer cylinder. The gap 141 may have a V-shape. Therefore, when the connecting parts 140 are bent, phenomena such as overlapping between adjacent connecting parts 140 are not easy to occur, and each connecting part 140 is ensured to have enough space for bending. After the connection portion is bent, the width of the gap in the direction perpendicular to the radial direction of the inner tube and perpendicular to the direction of the central axis of the inner tube may be equal. Before the connection portion is bent, the width of the gap in the direction perpendicular to the radial direction of the inner tube and perpendicular to the direction of the central axis of the inner tube may be equal.
In one embodiment, the maximum width of the gap 141 in a direction perpendicular to the radial direction of the inner barrel and perpendicular to the direction of the central axis of the inner barrel is greater than or equal to 1 mm and less than or equal to 20 mm.
In the case where the connection portion is detachably connected to the edge of the outer cylinder and the outer edge of the end socket close to the outer cylinder, when the width of the gap in the direction perpendicular to the radial direction of the inner cylinder and perpendicular to the direction of the central axis of the inner cylinder is gradually increased, one end of the connection portion may be connected to the edge of the end socket first, and then the other end of the connection portion may be connected to the edge of the inner cylinder or the outer cylinder.
In order to ensure the tightness of the thermal barrier, in one embodiment the thermal barrier further comprises a glue layer for covering the gap. The gap may be filled by welding. Wherein, the adhesive layer can be an adhesive tape.
Although the thermal shield is generally not under pressure, in order not to increase the overall length of the cryostat containing the thermal shield, it is necessary to maintain as much as possible the relative spacing between the thermal shield and the inner and outer vessels of the cryostat, and it is therefore necessary for the end closures of the thermal shield to also have a smooth transition. On the other hand, in order to obtain good heat conduction and heat shielding performance, the heat shield layer is usually made of aluminum alloy material, large-scale stamping equipment is required, and a complicated stamping die and machining process are required to be designed. Above-mentioned head, first border and/or second border are provided with connecting portion, and connecting portion incline towards the direction at head place to make the head of heat shield also have smooth transition, reduce edge stress, and then the thickness and the reduce cost of attenuate head and barrel. In addition, the adjacent connecting parts have gaps therebetween, so that the force required for bending and the like of the connecting parts is reduced, thereby facilitating the formation of the connecting parts, facilitating the manufacture of the heat shield layer, and also reducing the cost and the manufacturing time.
It should be noted that, when only the first edge is provided with the connecting portion, the structure of each component in the heat shield, the connection relationship between the components, and the like are as described above for the heat shield having only the second edge provided with the connecting portion, and details thereof are not repeated herein.
When the first edge and the second edge are both provided with the connecting portion, the structure of each component in the heat shield layer, the connection relationship between the components, and the like are the heat shield layer provided with the connecting portion only at the second edge as described above, which is not described herein again.
The cryostat of an embodiment includes an inner vessel, an outer vacuum vessel, and the above-described thermal shield. The heat shield layer is concentrically sleeved outside the inner container, and the outer vacuum container is concentrically sleeved outside the heat shield layer. The cryostat is for use in a superconducting magnet structure. The edge of the end socket contacting with the inner cylinder is a first edge, and the edge of the end socket contacting with the outer cylinder is a second edge.
The first edge and/or the second edge are provided with a connecting portion. The connecting part inclines towards the direction of the end socket, so that the end socket of the heat shield layer has smooth transition, the edge stress is reduced, the thickness of the end socket and the cylinder is reduced, and the cost is reduced. And when the heat shielding layer is matched with the inner container and the outer vacuum container, the relative clearance between the multiple layers of containers can be kept small, so that the length of the low-temperature retainer is small, and the claustrophobic effect of the magnetic resonance equipment is improved.
In addition, a gap is formed between adjacent connecting parts, so that the force required for bending and the like of the connecting parts is reduced, the forming of the connecting parts is facilitated, and the manufacturing of the heat shielding layer is facilitated, so that the manufacturing of the low-temperature retainer is facilitated and the manufacturing cost is low.
As shown in fig. 8, a mold set for fabricating the above-described heat shield layer of an embodiment includes a first mold 210 and a second mold 220. The first mold 210 has a first inclined surface 211, the second mold 220 has a second inclined surface 221 adapted to the first inclined surface 211, and the first mold 210 and the second mold 220 are used to form a connection portion.
Specifically, referring again to fig. 8, when the connection portions are formed to extend from the edge of the head, or when the connection portions are formed to extend from the edge of the inner cylinder or the edge of the outer cylinder, the connection portions are not connected to or affected by each other due to a gap between adjacent connection portions. Therefore, the first die 210 and the second die 220 can be placed on two sides of the connecting part to be bent, and the first die 210 and the second die 220 are clamped by applying smaller pressure, so that the bending of the single connecting part can be completed. Therefore, the forming process of the connecting part is simple, the resilience of the material is small in the forming process, the deformation of the material is easy to control, and the required pressure is greatly reduced.
In one of the embodiments, a width of the mold in a direction perpendicular to a radial direction of the inner tube and perpendicular to a direction of a central axis of the inner tube is equal to or smaller than a width of the connecting portion in a direction perpendicular to the radial direction of the inner tube and perpendicular to the direction of the central axis of the inner tube.
In one embodiment, the width of the gap in the direction perpendicular to the radial direction of the inner cylinder and perpendicular to the direction of the central axis of the inner cylinder is gradually increased from the edge of the seal head to the edge of the inner cylinder or the outer cylinder. Taking the example in which the connecting portion is provided on the second edge and the connecting portion is formed to extend from the edge of the head close to the outer cylinder, the width of the gap in the direction perpendicular to the radial direction of the inner cylinder and perpendicular to the direction of the central axis of the inner cylinder is gradually increased from the edge of the head toward the edge of the outer cylinder. Wherein, the shape of the clearance can be V-shaped. Therefore, when the connecting parts are bent, phenomena such as overlapping and the like are not easy to generate between the adjacent connecting parts, and each connecting part is ensured to have enough space for bending. In one embodiment, the maximum width of the gap in a direction perpendicular to the radial direction of the inner tube and perpendicular to the direction of the central axis of the inner tube is greater than or equal to 1 mm and less than or equal to 20 mm.
A method of fabricating a thermal shield of an embodiment, comprising the steps of:
s1: a plurality of gaps are arranged on the end socket.
Specifically, the gaps extend to the outer edge of the end socket, the connecting parts are defined between adjacent gaps, and the width of the gaps in the direction perpendicular to the radial direction of the end socket and perpendicular to the direction of the central axis of the end socket is gradually increased from the outer edge of the end socket to the edge of the outer cylinder. By adopting the gap, the connecting part can be conveniently bent subsequently.
S2: the connecting part is bent towards the direction of the outer cylinder under the action of pressure.
Specifically, the connecting portion may be bent in the direction of the outer cylinder by applying pressure to the connecting portion through the die set. Because the gap is vertical to the radial direction of the inner cylinder and the width of the gap in the direction vertical to the direction of the central axis of the inner cylinder is gradually increased, when the connecting parts are bent, the adjacent connecting parts are not easy to overlap, and the like, and each connecting part is ensured to have enough space for bending. In one embodiment, the maximum width of the gap in a direction perpendicular to the radial direction of the inner tube and perpendicular to the direction of the central axis of the inner tube is greater than or equal to 1 mm and less than or equal to 20 mm.
S3: and connecting the edge of the connecting part far away from the connecting part with the edge of the outer cylinder.
Specifically, the edge of the connecting portion remote from the connecting portion is connected with the edge of the outer cylinder by welding. The edge of the connecting portion remote from the connecting portion and the edge of the outer cylinder are also connected by another method such as rivet welding.
A method of fabricating a thermal shield of another embodiment includes the steps of:
s10: a plurality of gaps are arranged on the outer cylinder.
Specifically, the gaps extend to the edge of the outer cylinder, the connecting parts are defined between adjacent gaps, and the width of the gaps in the direction perpendicular to the radial direction of the outer cylinder and the direction perpendicular to the central axis of the outer cylinder is gradually increased from the edge of the outer cylinder to the end socket. By adopting the gap, the connecting part can be conveniently bent subsequently.
S20: and bending the connecting part towards the direction of the end enclosure under the action of pressure.
Specifically, the connecting part can be pressed by the die set, so that the connecting part is bent towards the direction of the end enclosure. Because the gap is vertical to the radial direction of the inner cylinder and the width of the gap in the direction vertical to the direction of the central axis of the inner cylinder is gradually increased, when the connecting parts are bent, the adjacent connecting parts are not easy to overlap, and the like, and each connecting part is ensured to have enough space for bending. In one embodiment, the maximum width of the gap in a direction perpendicular to the radial direction of the inner tube and perpendicular to the direction of the central axis of the inner tube is greater than or equal to 1 mm and less than or equal to 20 mm.
S30: and connecting the edge of the connecting part far away from the connecting part with the outer edge of the seal head.
Specifically, the edge of the connecting part far away from the connecting part is connected with the outer edge of the sealing head by welding. The edge of the connecting portion away from the connecting portion is connected to the outer edge of the end enclosure by other means such as rivet welding.
It should be noted that, the connecting portion may also be processed by laser cutting, casting, etc., and then both ends of the connecting portion are respectively connected with the edge of the outer cylinder and the edge of the end socket close to the outer cylinder. The two ends of the connecting part can be respectively connected with the edge of the outer cylinder and the edge of the end socket close to the outer cylinder by welding or riveting.
In addition, when the connecting part is arranged on the first edge defined by the edge where the inner cylinder and the end enclosure are contacted, the manufacturing method of the heat shielding layer is similar to the manufacturing method of the heat shielding layer, and the description is omitted.
When the first edge and the second edge are both provided with the connecting parts, gaps can be formed on the two edges of the seal head, and then the connecting parts are pressed to be connected with the edge of the inner cylinder and the edge of the outer cylinder respectively. Gaps can be respectively arranged on the edge of the inner cylinder and the edge of the outer cylinder, and then the connecting part limited between the adjacent gaps is bent and finally connected with the edge of the end enclosure.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A thermal shield, comprising:
an inner barrel;
the outer cylinder is sleeved outside the inner cylinder;
the end socket is arranged between the inner cylinder and the outer cylinder and is positioned at the end part of the inner cylinder, the end socket is connected with the inner cylinder and the outer cylinder, the edge of the end socket, which is contacted with the inner cylinder, is a first edge, and the edge of the end socket, which is contacted with the outer cylinder, is a second edge; and
the connecting part is arranged on the first edge and/or the second edge and is used for connecting the inner cylinder and the seal head and/or the outer cylinder and the seal head; the connecting part is inclined relative to the end enclosure; the number of the connecting parts is multiple, and the connecting parts are distributed along the circumferential direction of the end enclosure; gaps are formed between adjacent connecting parts, and the width of the gaps in the circumferential direction of the connecting parts is gradually increased before bending forming.
2. The thermal shield of claim 1, wherein the connection is formed extending from an outer edge of the header proximate the outer tube, and the connection is bent in a direction toward the outer tube such that the connection is connected to the edge of the outer tube.
3. The thermal shield of claim 1, wherein the connection is formed extending from an edge of the outer sleeve, the connection being bent in a direction toward the inner sleeve such that the connection is connected to an outer edge of the header proximate the outer sleeve.
4. The thermal shield of claim 1, wherein the connection is removably connected to an edge of the outer tube, and the connection is removably connected to an outer edge of the header proximate the outer tube.
5. The heat shield as set forth in claim 1 wherein the width of the gap in the circumferential direction of the connecting portion is 1 mm or more and 20 mm or less before the fold formation.
6. The thermal shield of claim 5 further comprising a glue layer for covering the gap.
7. A cryostat for a superconducting magnet structure, the cryostat comprising an inner vessel, an outer vacuum vessel, and a thermal shield as claimed in any of claims 1 to 6, the thermal shield being concentrically nested outside the inner vessel, the outer vacuum vessel being concentrically nested outside the thermal shield.
8. A die set for making the heat shield of any of claims 1-6, comprising a first die having a first inclined face and a second die having a second inclined face adapted to the first inclined face, the first die and the second die being adapted to form the connection.
9. A method of making a thermal shield comprising the steps of:
the end socket is provided with a plurality of gaps, the gaps extend to the outer edge of the end socket, a connecting part is defined between every two adjacent gaps, and the width of each gap in the circumferential direction of the connecting part is gradually increased from the outer edge of the end socket to the edge of the outer cylinder;
bending the connecting part towards the direction of the outer cylinder under the action of pressure;
connecting an edge of the connecting part, which is far away from the connecting part, with an edge of the outer barrel;
the connecting part is inclined relative to the end socket.
10. A method of making a thermal shield comprising the steps of:
the outer cylinder is provided with a plurality of gaps, the gaps extend to the edge of the outer cylinder, a connecting part is defined between every two adjacent gaps, and the width of each gap in the circumferential direction of the connecting part is gradually increased from the edge of the outer cylinder to the end socket;
bending the connecting part towards the direction of the seal head under the action of pressure;
connecting the edge of the connecting part far away from the connecting part with the outer edge of the seal head;
the connecting part is inclined relative to the end socket.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710906373.9A CN107564658B (en) | 2017-09-29 | 2017-09-29 | Heat shield layer, method for manufacturing the same, cryostat, and mold set |
| US16/024,765 US11187381B2 (en) | 2017-09-29 | 2018-06-30 | Cryostat devices for magnetic resonance imaging and methods for making |
| US17/456,654 US20220082209A1 (en) | 2017-09-29 | 2021-11-29 | Cryostat devices for magnetic resonance imaging and methods for making |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101024432A (en) * | 2006-02-24 | 2007-08-29 | 张连元 | Enclosuring-hoop type curled-edge like enclosure, its sealing, clamping and making method |
| CN200951449Y (en) * | 2006-06-30 | 2007-09-26 | 比亚迪股份有限公司 | Die for turning-up use |
| JP2014161860A (en) * | 2013-02-22 | 2014-09-08 | Mitsubishi Heavy Industries Food & Packaging Machinery Co Ltd | Can seamer |
| CN105823996A (en) * | 2015-01-08 | 2016-08-03 | 西门子(深圳)磁共振有限公司 | Thermal radiation screen for superconducting magnet, superconducting magnet and magnetic resonance imaging device |
| CN106653280A (en) * | 2015-10-30 | 2017-05-10 | 上海联影医疗科技有限公司 | Superconducting magnet assembly for magnetic resonance imaging and manufacturing method thereof |
| CN107035865A (en) * | 2016-02-04 | 2017-08-11 | 南通中集罐式储运设备制造有限公司 | Internal pressure end socket and tank body, transportable pressure vessel with the end socket |
-
2017
- 2017-09-29 CN CN201710906373.9A patent/CN107564658B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101024432A (en) * | 2006-02-24 | 2007-08-29 | 张连元 | Enclosuring-hoop type curled-edge like enclosure, its sealing, clamping and making method |
| CN200951449Y (en) * | 2006-06-30 | 2007-09-26 | 比亚迪股份有限公司 | Die for turning-up use |
| JP2014161860A (en) * | 2013-02-22 | 2014-09-08 | Mitsubishi Heavy Industries Food & Packaging Machinery Co Ltd | Can seamer |
| CN105823996A (en) * | 2015-01-08 | 2016-08-03 | 西门子(深圳)磁共振有限公司 | Thermal radiation screen for superconducting magnet, superconducting magnet and magnetic resonance imaging device |
| CN106653280A (en) * | 2015-10-30 | 2017-05-10 | 上海联影医疗科技有限公司 | Superconducting magnet assembly for magnetic resonance imaging and manufacturing method thereof |
| CN107035865A (en) * | 2016-02-04 | 2017-08-11 | 南通中集罐式储运设备制造有限公司 | Internal pressure end socket and tank body, transportable pressure vessel with the end socket |
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