CN117219393A - Cold screen structure and suspension device - Google Patents

Abstract

The invention belongs to the technical field of installation structures of conductive cooling superconducting magnets, and discloses a cold screen structure and a suspension device. The cold screen inner cylinder is arranged in the cold screen outer cylinder, the cold screen inner cylinder is sleeved outside the vacuum container inner cylinder at intervals, and the cold screen outer cylinder is arranged in the vacuum container outer cylinder at intervals; the cold screen upper end cover and the cold screen lower end cover are respectively connected to two ends of the cold screen outer cylinder, and an annular shielding cavity for accommodating cold quality is formed by enclosing the cold screen outer cylinder, the cold screen inner cylinder, the cold screen upper end cover and the cold screen lower end cover; the cold screen upper flange and the cold screen lower flange are respectively connected to two ends of the cold screen inner cylinder, the cold screen upper flange is located on one side, deviating from the cold screen lower end cover, of the cold screen upper end cover, and the cold screen lower end cover is placed on the cold screen lower flange. The cold screen structure can prevent structural damage caused by internal stress due to temperature difference, ensure cold mass assembly precision, improve cold mass assembly coaxiality and improve assembly efficiency.

Description

Cold screen structure and suspension device

Technical Field

The invention relates to the technical field of installation structures of conduction cooling superconducting magnets, in particular to a cold screen structure and a suspension device.

Background

Superconducting magnets refer to an electromagnet having coils made of a second type of superconductor having a high transition temperature and a particularly high critical magnetic field at low temperatures. The main characteristic is that there is no electric loss caused by the wire resistance, there is no magnetic loss caused by the existence of iron core, and it has very strong practical value. The conduction cooling superconducting magnet directly cools the cold mass of the superconducting coil by adopting a refrigerator, and the steady-state operation does not need to be participated by a refrigerant, so that superconducting equipment is not limited by helium resource shortage.

The cold mass of the conduction cooling superconducting magnet needs to be fixedly stored by utilizing a suspension device, wherein the suspension device comprises a vacuum container and a cold screen structure arranged in the vacuum container, and the cold mass is stored in a shielding cavity in the cold screen structure. The existing cold screen structure comprises a cold screen upper end plate, a cold screen lower end plate, a cold screen outer cylinder and a cold screen inner cylinder. The cold screen inner cylinder is sleeved in the cold screen outer cylinder, and the cold screen upper end plate and the cold screen lower end plate are respectively and fixedly connected with two ends of the cold screen inner cylinder sleeve and the cold screen outer cylinder which are sleeved together to form an annular shielding cavity.

However, the temperature difference can be generated after the temperature of the superconducting magnet is reduced, the cold screen outer cylinder and the cold screen inner cylinder of the cold screen structure have inconsistent deformation, and the generated internal stress can cause the damage of the cold screen structure. And current suspension device and cold quality need set up coaxial positioning frock in order to guarantee the assembly accuracy of cold quality when assembling, and above-mentioned coaxial positioning frock needs extra setting, has the complicated problem of operation, is unfavorable for promoting the assembly efficiency of cold quality.

Therefore, a cold screen structure and a suspension device are needed to solve the above problems.

Disclosure of Invention

According to one aspect of the present invention, it is an object to provide a cold screen structure capable of preventing structural damage problems caused by internal stress due to temperature differences, ensuring assembly accuracy of cold quality.

To achieve the purpose, the invention adopts the following technical scheme:

the cold screen structure sets up between the vacuum vessel inner tube and the vacuum vessel urceolus of vacuum vessel, the vacuum vessel inner tube set up in the vacuum vessel urceolus, the cold screen structure includes:

the cold screen outer cylinder and the cold screen inner cylinder are arranged in the cold screen outer cylinder, the cold screen inner cylinder is sleeved outside the vacuum container inner cylinder at intervals, and the cold screen outer cylinder is arranged in the vacuum container outer cylinder at intervals;

the cold screen upper end cover and the cold screen lower end cover are respectively connected to two ends of the cold screen outer cylinder, and an annular shielding cavity is formed by enclosing the cold screen outer cylinder, the cold screen inner cylinder, the cold screen upper end cover and the cold screen lower end cover, and can accommodate cold quality;

the cold screen upper flange and the cold screen lower flange are respectively connected to two ends of the cold screen inner barrel, the cold screen upper flange is located on one side, deviating from the cold screen lower end cover, of the cold screen upper end cover, and the cold screen lower end cover is placed on the cold screen lower flange.

As the preferable scheme of the cold screen structure, the cold screen structure further comprises a cold screen centering ring and a cold mass centering ring, wherein the cold screen centering ring is annularly arranged and abutted between the inner side of the cold screen inner cylinder and the inner cylinder of the vacuum container, and the cold mass centering ring is annularly arranged and abutted between the outer side of the cold screen inner cylinder and the cold mass.

As the preferable scheme of the cold screen structure, the cold screen centering ring comprises a first annular connecting part and a first annular positioning part, wherein the first annular positioning part is fixedly connected to the inner side of the first annular connecting part, the first annular connecting part is connected to the cold screen upper flange or the cold screen lower flange, and the first annular positioning part is clamped between the cold screen inner cylinder and the vacuum container inner cylinder;

the cold mass centering ring comprises a second annular connecting portion and a second annular positioning portion, the second annular positioning portion is fixedly connected to the inner side of the second annular connecting portion, the second annular connecting portion is connected to the cold mass, and one side, deviating from the second annular connecting portion, of the second annular positioning portion abuts against the inner cylinder of the cold screen.

As the preferable scheme of the cold screen structure provided by the invention, a plurality of through holes which are arranged at intervals are uniformly formed along the circumferential direction of the first annular positioning part;

the second annular positioning part comprises an annular frame body and a plurality of supporting ribs, the annular frame body is coaxially arranged on the inner side of the second annular connecting part, and the supporting ribs are uniformly arranged along the circumferential direction and connected between the annular frame body and the second annular connecting part.

As the preferable scheme of the cold screen structure provided by the invention, the cold screen centering ring and the cold mass centering ring are both made of epoxy glass fiber materials.

As the preferable scheme of the cold screen structure provided by the invention, the cold screen inner cylinder is in threaded connection with the cold screen upper flange; and/or the number of the groups of groups,

the cold screen inner cylinder is in threaded connection with the cold screen lower flange.

As the preferable scheme of the cold screen structure, the cold screen structure further comprises a cold screen suspension pull rod, and the cold screen suspension pull rod is connected to the cold screen upper end cover and the inner top of the vacuum container.

As the preferable scheme of the cold screen structure provided by the invention, a plurality of cold screen suspension pull rods are arranged, and the plurality of cold screen suspension pull rods are uniformly distributed on the cold screen upper end cover along the circumferential direction.

According to another aspect of the present invention, an object is to provide a suspension device, where the suspension device includes a vacuum container and a cold screen structure according to any one of the above schemes, the vacuum container includes a vacuum container inner cylinder, a vacuum container outer cylinder, a vacuum container upper cover and a vacuum container lower cover, and the vacuum container upper cover and the vacuum container lower cover are respectively disposed at two ends of the vacuum container inner cylinder and the vacuum container outer cylinder, and form a vacuum chamber; the cold screen structure is coaxially arranged outside the inner cylinder of the vacuum container.

As the preferable scheme of the suspension device provided by the invention, the suspension device further comprises a plurality of cold mass suspension pull rods, wherein the plurality of cold mass suspension pull rods are uniformly connected with the cold mass along the circumferential direction, penetrate through the upper end cover of the cold screen and are connected with the upper cover of the vacuum container.

The invention has the beneficial effects that:

the cold screen structure provided by the invention is arranged between the inner cylinder of the vacuum container and the outer cylinder of the vacuum container, the inner cylinder of the vacuum container is arranged in the outer cylinder of the vacuum container, and the cold screen structure comprises the outer cylinder of the cold screen, the inner cylinder of the cold screen, the upper end cover of the cold screen, the lower end cover of the cold screen, the upper flange of the cold screen and the lower flange of the cold screen. The cold screen inner cylinder is arranged in the cold screen outer cylinder, the cold screen inner cylinder is sleeved outside the vacuum container inner cylinder at intervals, and the cold screen outer cylinder is arranged in the vacuum container outer cylinder at intervals. The cold screen upper end cover and the cold screen lower end cover are respectively connected to two ends of the cold screen outer cylinder, and the cold screen outer cylinder, the cold screen inner cylinder, the cold screen upper end cover and the cold screen lower end cover enclose to form an annular shielding cavity which can accommodate cold quality. The upper cold screen flange and the lower cold screen flange are respectively connected to two ends of the inner cold screen cylinder, the upper cold screen flange is positioned on one side of the upper cold screen end cover, which is away from the lower cold screen end cover, and the lower cold screen end cover is placed on the lower cold screen flange. That is, the cold mass holds in annular shielding cavity, produces the difference in temperature after the cooling, and cold screen urceolus and cold screen inner tube all appear cold shrinkage deformation, because cold screen urceolus and cold screen inner tube do not interconnect, and also do not connect on same tip structure spare, consequently can not take place because the internal stress problem that cold shrinkage deformation degree is different and lead to, effectively prevent cold screen structure's damage.

Drawings

Fig. 1 is a schematic view of a part of a suspension device according to an embodiment of the present invention;

FIG. 2 is an enlarged view of a portion of the structure labeled A in FIG. 1;

FIG. 3 is an enlarged view of a portion of the structure labeled B in FIG. 1;

FIG. 4 is a schematic view of a part of a cold screen centering ring according to an embodiment of the present invention;

fig. 5 is a schematic partial structure of a cold mass centering ring according to an embodiment of the present invention.

In the figure:

1. a cold mass;

10. a vacuum container; 11. an inner cylinder of the vacuum container; 12. a vacuum container upper cover; 13. a vacuum container lower cover; 20. a cold mass suspension tie rod;

100. a cold screen outer cylinder;

200. a cold screen inner cylinder;

300. an upper end cover of the cold screen;

400. a cold screen lower end cover;

500. a cold screen upper flange;

600. a cold screen lower flange;

700. centering ring of cold screen; 710. a first annular connection; 720. a first annular positioning portion; 721. a through hole;

800. a cold mass centering ring; 810. a second annular connection portion; 820. a second annular positioning portion; 821. an annular frame; 822. support ribs;

900. the cold screen hangs the pull rod.

Detailed Description

The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.

In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", "left", and the like are orientation or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

Fig. 1 is a schematic view showing a part of a structure of a suspension device according to an embodiment of the present invention; FIG. 2 shows a close-up view of the structure labeled A in FIG. 1; fig. 3 shows a partial enlarged view of the structure marked B in fig. 1. Referring to fig. 1-3, the present embodiment provides a cold screen structure and a suspension device. The suspension device includes a vacuum vessel 10 and a cold screen structure provided in this embodiment. The vacuum vessel 10 includes a vacuum vessel inner cylinder 11, a vacuum vessel outer cylinder (not shown), a vacuum vessel upper cover 12, and a vacuum vessel lower cover 13. The vacuum container inner cylinder 11 is arranged in the vacuum container outer cylinder, the vacuum container upper cover 12 and the vacuum container lower cover 13 are respectively arranged at two ends of the vacuum container inner cylinder 11 and the vacuum container outer cylinder, and a vacuum chamber is formed by surrounding. The cold screen structure is annular and is coaxially arranged outside the inner cylinder 11 of the vacuum container.

Specifically, the cold shield structure includes a cold shield outer cylinder 100, a cold shield inner cylinder 200, a cold shield upper end cap 300, a cold shield lower end cap 400, a cold shield upper flange 500, and a cold shield lower flange 600. The inner cooling screen cylinder 200 is coaxially and alternately arranged in the outer cooling screen cylinder 100, the inner cooling screen cylinder 200 is alternately sleeved outside the inner vacuum container cylinder 11, and the outer cooling screen cylinder 100 is alternately arranged in the outer vacuum container cylinder. The cold screen upper end cover 300 and the cold screen lower end cover 400 are respectively and fixedly connected to two ends of the cold screen outer cylinder 100, and the cold screen outer cylinder 100, the cold screen inner cylinder 200, the cold screen upper end cover 300 and the cold screen lower end cover 400 enclose to form an annular shielding chamber which can accommodate the cold mass 1.

More specifically, the cold shield upper flange 500 and the cold shield lower flange 600 are respectively connected to both ends of the cold shield inner cylinder 200. The cold screen upper flange 500 is located on the side of the cold screen upper end cap 300 facing away from the cold screen lower end cap 400 and no rigid connection is provided therebetween. The cold screen lower end cap 400 is placed over the cold screen lower flange 600, again without a rigid connection therebetween. That is, there is no rigid connection between the cold shield outer cylinder 100 and the cold shield inner cylinder 200, the cold mass 1 is accommodated in the annular shielding chamber, a temperature difference is generated after cooling, and cold contraction deformation occurs in both the cold shield outer cylinder 100 and the cold shield inner cylinder 200. Since there is no rigid connection between the cold shield outer cylinder 100 and the cold shield inner cylinder 200, the cold shield outer cylinder 100 and the cold shield inner cylinder 200 do not have the problem of internal stress caused by different degrees of cold shrinkage deformation, and damage to the cold shield structure is effectively prevented.

More specifically, the suspension device further includes a plurality of cold mass suspension ties 20. The plurality of cold mass suspension ties 20 are uniformly connected to the circumferential side of the cold mass 1 in the circumferential direction, penetrate the cold screen upper cover 300, and are connected to the vacuum vessel upper cover 12. Through the arrangement, the cold mass 1 is directly suspended on the inner side of the upper cover 12 of the vacuum container, so that the cold mass 1 is prevented from being directly connected to the cold screen structure, the cold screen structure is prevented from bearing too heavy, and the suspension reliability of the cold mass 1, the service life of the cold screen structure and the structural stability are further ensured.

With continued reference to fig. 1, the cold screen structure further includes a cold screen suspension pull rod 900. The cold screen suspension rod 900 is connected between the cold screen upper end cap 300 and the inner top of the vacuum vessel 10 to achieve suspension of the cold screen structure in the vacuum vessel 10.

Preferably, the cold screen suspension tension rod 900 is provided in plurality. The plurality of cold shield hanging tie rods 900 are uniformly distributed on the cold shield upper end cover 300 along the circumferential direction, thereby enhancing the reliability and stability of the cold shield structure hanging.

Preferably, the cold shield inner cylinder 200 is in threaded connection with the cold shield upper flange 500; and/or the cold shield inner cylinder 200 is screwed with the cold shield lower flange 600. In this embodiment, referring to fig. 3, the cold shield inner cylinder 200 is connected with the cold shield lower flange 600 through threads, so that the axial positioning adjustment of the cold shield inner cylinder 200 is performed, and meanwhile, fine adjustment of the height of the cold shield structure in the vacuum container 10 is realized, so as to ensure structural stability and flexibility of assembly.

FIG. 4 is a schematic view showing a partial structure of a cold screen centering ring according to an embodiment of the present invention; fig. 5 shows a schematic partial structure of a cold mass centering ring provided by an embodiment of the present invention. Referring to fig. 2 to 5, the cold screen structure further includes a cold screen centering ring 700 and a cold mass centering ring 800. The cold shield centering ring 700 is looped around and abuts between the inner side of the cold shield inner cylinder 200 and the inner cylinder 11 of the vacuum vessel, and the cold mass centering ring 800 is looped around and abuts between the outer side of the cold shield inner cylinder 200 and the cold mass 1. Through this cold screen centering ring 700 and this cold mass centering ring 800, can promote the stability of cold screen inner tube 200, can carry out radial positioning to cold mass 1 and cold screen inner tube 200 again, improve assembly precision and efficiency, and need not to set up coaxial location frock additionally, reduce operation complexity.

In particular, referring to fig. 2 and 4, the cold screen centering ring 700 includes a first annular connecting portion 710 and a first annular positioning portion 720. The first annular positioning portion 720 is integrally formed and fixedly connected to the inner side of the first annular connecting portion 710, and the first annular positioning portion 720 is clamped between the inner cooling screen cylinder 200 and the inner vacuum container cylinder 11. In the present embodiment, two cold shield centering rings 700 are provided, wherein a first annular connection portion 710 of one cold shield centering ring 700 is connected to the cold shield upper flange 500, and a first annular connection portion 710 of the other cold shield centering ring 700 is connected to the cold shield lower flange 600. In other embodiments, only one cold screen centering ring 700 may be provided to enable radial positioning of the cold mass 1 and the cold screen inner barrel 200.

Still more specifically, the cold mass centering ring 800 includes a second annular connecting portion 810 and a second annular positioning portion 820. The second annular positioning portion 820 is fixedly connected to the inner side of the second annular connecting portion 810, the second annular connecting portion 810 is connected to the cold mass 1, and one side of the second annular positioning portion 820 away from the second annular connecting portion 810 abuts against the cold screen inner cylinder 200. In this embodiment, a cold mass centering ring 800 is disposed at both the upper and lower ends of the cold mass 1, and in other embodiments, only one cold mass centering ring 800 may be disposed, so as to achieve radial positioning of the cold mass 1 and the cold shield inner cylinder 200.

More specifically, a plurality of through holes 721 are uniformly provided at intervals along the circumferential direction of the first annular positioning portion 720. The second annular positioning portion 820 includes an annular frame 821 and a plurality of support ribs 822, wherein the annular frame 821 is coaxially disposed inside the second annular connecting portion 810, and the plurality of support ribs 822 are uniformly disposed along the circumferential direction and connected between the annular frame 821 and the second annular connecting portion 810. Through the above arrangement, the first annular positioning portion 720 and the second annular positioning portion 820 form a hollow structure, so as to reduce the heat conduction and leakage problem between different temperature areas.

Preferably, the cold screen centering ring 700 and the cold mass centering ring 800 are both made of epoxy fiberglass material. The material has higher structural strength, can ensure the radial positioning effect of the cold mass 1 and the cold screen inner cylinder 200, has lower heat conductivity, and can further reduce the conduction heat leakage problem between different temperature areas.

It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the invention. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.

Claims (10)

1. The cold screen structure, its characterized in that sets up between vacuum vessel inner tube (11) and the vacuum vessel urceolus of vacuum vessel (10), vacuum vessel inner tube (11) set up in the vacuum vessel urceolus, the cold screen structure includes:

the cold screen outer cylinder (100) and the cold screen inner cylinder (200), the cold screen inner cylinder (200) is arranged in the cold screen outer cylinder (100), the cold screen inner cylinder (200) is sleeved outside the vacuum container inner cylinder (11) at intervals, and the cold screen outer cylinder (100) is arranged in the vacuum container outer cylinder at intervals;

the cold screen upper end cover (300) and the cold screen lower end cover (400), the cold screen upper end cover (300) and the cold screen lower end cover (400) are respectively connected to two ends of the cold screen outer cylinder (100), and the cold screen outer cylinder (100), the cold screen inner cylinder (200), the cold screen upper end cover (300) and the cold screen lower end cover (400) are enclosed to form an annular shielding cavity, and the annular shielding cavity can accommodate a cold mass (1);

cold screen flange (500) and cold screen lower flange (600), cold screen flange (500) with cold screen lower flange (600) connect respectively in cold screen inner tube (200) both ends, cold screen flange (500) are located cold screen upper end cover (300) deviate from one side of cold screen lower end cover (400), cold screen lower end cover (400) place in cold screen lower flange (600).

2. The cold shield structure according to claim 1, further comprising a cold shield centering ring (700) and a cold mass centering ring (800), the cold shield centering ring (700) being looped around and abutting between the inner side of the cold shield inner cylinder (200) and the vacuum vessel inner cylinder (11), the cold mass centering ring (800) being looped around and abutting between the outer side of the cold shield inner cylinder (200) and the cold mass (1).

3. The cold shield structure according to claim 2, wherein the cold shield centering ring (700) comprises a first annular connecting portion (710) and a first annular positioning portion (720), the first annular positioning portion (720) is fixedly connected to the inner side of the first annular connecting portion (710), the first annular connecting portion (710) is connected to the cold shield upper flange (500) or the cold shield lower flange (600), and the first annular positioning portion (720) is clamped between the cold shield inner cylinder (200) and the vacuum container inner cylinder (11);

the cold mass centering ring (800) comprises a second annular connecting portion (810) and a second annular positioning portion (820), the second annular positioning portion (820) is fixedly connected to the inner side of the second annular connecting portion (810), the second annular connecting portion (810) is connected to the cold mass (1), and one side, deviating from the second annular connecting portion (810), of the second annular positioning portion (820) abuts against the cold screen inner cylinder (200).

4. A cold screen structure according to claim 3, wherein a plurality of through holes (721) are uniformly formed along the circumferential direction of the first annular positioning portion (720) at intervals;

the second annular positioning portion (820) comprises an annular frame body (821) and a plurality of supporting ribs (822), the annular frame body (821) is coaxially arranged on the inner side of the second annular connecting portion (810), and the supporting ribs (822) are uniformly distributed and connected between the annular frame body (821) and the second annular connecting portion (810) along the circumferential direction.

5. The cold shield structure according to claim 2, wherein the cold shield centering ring (700) and the cold mass centering ring (800) are both made of an epoxy glass fiber material.

6. The cold shield structure according to claim 1, wherein the cold shield inner cylinder (200) is screwed with the cold shield upper flange (500); and/or the number of the groups of groups,

the cold screen inner cylinder (200) is in threaded connection with the cold screen lower flange (600).

7. The cold shield structure of claim 1, further comprising a cold shield hanger bar (900), the cold shield hanger bar (900) being connected to the cold shield upper end cap (300) and an inner top of the vacuum vessel (10).

8. The cold screen structure according to claim 7, wherein the plurality of cold screen suspension tie rods (900) is a plurality, and the plurality of cold screen suspension tie rods (900) are circumferentially and uniformly distributed on the cold screen upper end cover (300).

9. The suspension device is characterized by comprising a vacuum container (10) and the cold screen structure as claimed in any one of claims 1-8, wherein the vacuum container (10) comprises a vacuum container inner cylinder (11), a vacuum container outer cylinder, a vacuum container upper cover (12) and a vacuum container lower cover (13), and the vacuum container upper cover (12) and the vacuum container lower cover (13) are respectively arranged at two ends of the vacuum container inner cylinder (11) and the vacuum container outer cylinder and are enclosed to form a vacuum chamber; the cold screen structure is coaxially arranged outside the inner cylinder (11) of the vacuum container.

10. The suspension device according to claim 9, further comprising a plurality of cold mass suspension ties (20), wherein the plurality of cold mass suspension ties (20) are uniformly connected to the cold mass (1) in a circumferential direction, penetrate the cold screen upper end cap (300), and are connected to the vacuum vessel upper cap (12).