阅读说明：本技术 一种无液氦超导磁体快速冷却装置 (Quick cooling device of no liquid helium superconducting magnet ) 是由 董振斌 高而震 刘向军 宗磊 马启元 于 2020-06-24 设计创作，主要内容包括：本发明公开了一种无液氦超导磁体快速冷却装置,用于无液氦磁体从常温快速冷却至低温,所述快速冷却装置包括触头I和触头II,其中：触头I,一端连接在GM制冷机一级冷头上,另一端通过快卸装置使其与触头II接触或者离开；触头II,固定在磁体线圈桶上,与触头I面接触；快卸装置,固定在常温外筒上,具有调节杆和旋转结构；调节杆一端通过绝热元件连接触头I,另一端延伸出常温外筒；旋转结构通过螺纹配合结构套接在调节杆上,底部与绝热元件之间设有伸缩结构。本发明的无液氦超导磁体快速冷却装置,提升了无液氦超导磁体前期制冷速度、整体快速制冷结构简单,人工操作方便,具有较好的推广应用前景。(The invention discloses a quick cooling device for a liquid-helium-free superconducting magnet, which is used for quickly cooling the liquid-helium-free magnet from normal temperature to low temperature, and comprises a contact I and a contact II, wherein: one end of the contact I is connected to the primary cold head of the GM refrigerator, and the other end of the contact I is contacted with or separated from the contact II through the quick release device; the contact II is fixed on the magnetic coil barrel and is in surface contact with the contact I; the quick-release device is fixed on the normal-temperature outer cylinder and is provided with an adjusting rod and a rotating structure; one end of the adjusting rod is connected with the contact I through a heat insulation element, and the other end of the adjusting rod extends out of the normal-temperature outer cylinder; the rotating structure is sleeved on the adjusting rod through a thread matching structure, and a telescopic structure is arranged between the bottom and the heat insulation element. The quick cooling device for the liquid-helium-free superconducting magnet improves the early-stage refrigeration speed of the liquid-helium-free superconducting magnet, has a simple integral quick refrigeration structure, is convenient to operate manually, and has a good popularization and application prospect.)

1. The utility model provides a quick cooling device of no liquid helium superconducting magnet for cool off magnet coil bucket (2) of cover in normal atmospheric temperature urceolus (1) fast, its characterized in that: the rapid cooling device comprises a contact I (3) and a contact II (4), wherein:

one end of the contact I (3) is connected to the primary cold head of the GM refrigerator, and the other end of the contact I (3) is contacted with the contact II (4) or separated from the contact II (4) through a quick release device (7);

the contact II (4) is fixed on the magnet coil barrel (2) and is in surface contact with the contact I (3);

the quick-release device (7) is fixed on the normal-temperature outer cylinder (1) and is provided with an adjusting rod (71) and a rotating structure (73);

one end of the adjusting rod (71) is connected with the contact I (3) through a heat insulation element (75), and the other end extends out of the normal temperature outer cylinder (1);

the rotating structure (73) is sleeved on the adjusting rod (71) through a thread matching structure, and a telescopic structure (72) is arranged between the bottom of the rotating structure and the heat insulation element (75).

2. The liquid-helium-free superconducting magnet rapid cooling device according to claim 1, wherein: the magnet coil barrel (2) is also connected with a temperature probe (6) for measuring the temperature of the magnet coil barrel (2).

3. The liquid-helium-free superconducting magnet rapid cooling device according to claim 2, wherein: the temperature probe (6) is also connected with a temperature display device.

4. The liquid-helium-free superconducting magnet rapid cooling device according to claim 1, wherein: the contact I (3) and the contact II (4) are made of one or two of oxygen-free copper, copper and aluminum.

5. The liquid-helium-free superconducting magnet rapid cooling device according to claim 4, wherein: and (3) mirror polishing the contact surfaces of the contact I (3) and the contact II (4).

6. The liquid-helium-free superconducting magnet rapid cooling device according to claim 1, wherein: a vacuum cavity (5) is arranged between the normal temperature outer cylinder (1) and the magnet coil barrel (2).

7. The liquid-helium-free superconducting magnet rapid cooling device according to claim 1, wherein: the rotating structure (73) is a nut or a hand wheel, and a gasket (74) is also pressed between the rotating structure (73) and the normal-temperature outer cylinder (1).

8. The liquid-helium-free superconducting magnet rapid cooling device according to claim 1, wherein: the contact I (3) is connected with the primary cold head through a soft connection structure (8), and the soft connection structure is made of a copper woven mesh belt or a multi-layer copper foil belt.

9. The liquid-helium-free superconducting magnet rapid cooling device according to claim 8, wherein: the contact area of the contact I (3) and the contact II (4) is more than 100cm²And the thickness of each of the contact I (3) and the contact II (4) is more than 10 mm.

10. The liquid-helium-free superconducting magnet rapid cooling apparatus according to any one of claims 1 to 9, wherein: the telescopic structure (72) is a welded corrugated pipe with the wall thickness smaller than 0.5mm, and the telescopic stroke of the telescopic structure is larger than 100 mm.

Technical Field

The invention relates to the technical field of liquid-helium-free superconducting magnets, in particular to a quick cooling device for a liquid-helium-free superconducting magnet.

Background

The existing liquid helium-free superconducting magnet is generally cooled by a GM refrigerator, the cold head is generally divided into two stages, and the first-stage cold head can provide dozens to hundreds of watts of cold in a 20K-300K temperature region; the secondary cold head is mainly used for maintaining cooling in a range of 4K-20K, the cold quantity is generally only in a range of one watt to several watts, the 4K magnet coil barrel is connected with the secondary cold head, and the early-stage cooling speed of the magnet is mainly determined by the cooling speed of the 4K magnet coil barrel with larger weight.

When the existing liquid helium-free superconducting magnet is cooled, the early-stage cooling speed of the 4k magnet coil barrel is low, so that the cooling speed of a GM refrigerator in the later stage is low as a whole.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides the liquid-helium-free superconducting magnet rapid cooling device which utilizes the flexibility of the corrugated pipe to connect the primary cold head with high cooling capacity with the 4K component (coil framework) and rotates the nut to separate the contact when the primary cold head is cooled to a preset temperature, so that the cooling speed of rapidly cooling the 4K coil framework in the early stage of the GM refrigerator is increased, and the overall cooling speed of the GM refrigerator is finally increased.

The technical scheme adopted by the invention is as follows: a quick cooling device for a liquid helium-free superconducting magnet is used for cooling a normal-temperature outer cylinder and a magnet coil barrel sleeved in the normal-temperature outer cylinder, and comprises a contact I and a contact II, wherein:

one end of the contact I is connected to the primary cold head of the GM refrigerator, and the other end of the contact I is connected with or separated from the contact II through a quick release device;

the contact II is fixed on the magnetic coil barrel and is in surface contact with the contact I;

the quick-release device is fixed on the normal-temperature outer cylinder and is provided with an adjusting rod and a rotating structure;

one end of the adjusting rod is connected with the contact I through a heat insulation element, and the other end of the adjusting rod extends out of the normal-temperature outer cylinder;

the rotating structure is sleeved on the adjusting rod through a thread matching structure and used for rotating to open or close the quick-release device, and a telescopic structure is arranged between the bottom of the rotating structure and the heat insulation element.

Further, the magnet coil barrel is also connected with a temperature probe which is used for measuring the temperature of the magnet coil barrel.

Further, the temperature probe is also connected with a temperature display device and is used for displaying the temperature of the magnet coil barrel.

Further, the material of the contact I and the contact II is oxygen-free copper, copper or aluminum.

Further, the contact surfaces of the contact I and the contact II are mirror-polished.

Further, the rotating structure can be designed into a nut or a hand wheel structure, and a gasket is further compressed between the rotating structure and the normal-temperature outer barrel and used for enhancing the connecting structure of the rotating structure and the normal-temperature outer barrel.

Further, the contact I is connected with the primary cold head through a soft connection structure, and the soft connection structure is made of a copper woven mesh belt or a multi-layer copper foil belt.

Further, the contact area of the contact I and the contact II is more than 100cm²And the thickness of each of the contact I and the contact II is more than 10 mm.

Further, the telescopic structure is a welded corrugated pipe with the wall thickness smaller than 0.5mm, and the telescopic stroke of the telescopic structure is larger than 100 mm.

When the liquid helium-free superconducting magnet rapid cooling device works, the adjusting rod with the rotating structure is used for pressing the telescopic structure to the contact I and the contact II, the primary cold head and the secondary cold head are connected, the primary cold head and the secondary cold head are used for cooling the magnet coil barrel at the same time, and the primary cold head and the magnet coil barrel (namely, the 4K barrel) are quickly connected.

The primary cold head with larger cooling wattage (namely, larger cooling capacity) is used in the initial cooling process of the magnet coil barrel, then when the cooling temperature of the magnet coil barrel reaches a preset temperature value, the rotary structure is rotated, the compression joint is loosened to transfer the hot contact I and the contact II to be separated, and at the moment, the secondary cold head independently cools the magnet coil barrel to 4K, so that the early quick cooling of the superconducting magnet without liquid helium is realized.

Compared with the prior art, the invention has the beneficial effects that:

1. the early-stage cooling speed of the liquid-helium-free superconducting magnet is increased, the first-stage cold head with high cooling capacity is connected with the magnet coil barrel (namely, the 4K barrel) by utilizing the flexibility of the telescopic structure, and the rotating structure is rotated to separate the contact I from the contact II after the high-cooling-capacity first-stage cold head is cooled to a preset temperature, so that the quick cooling is realized.

2. The temperature of the magnet coil barrel (namely 4K barrel) is detected in real time by using a temperature probe, and the magnet coil barrel is quickly separated after reaching a preset value.

3. The whole quick refrigeration structure is simple, and the manual operation is convenient.

In conclusion, the rapid cooling device for the liquid-helium-free superconducting magnet improves the early-stage refrigeration speed of the liquid-helium-free superconducting magnet, namely the overall refrigeration efficiency of the GM refrigerator, and has the advantages of simple overall rapid refrigeration structure, convenience in manual operation and better popularization and application prospects.

Drawings

FIG. 1 is a schematic structural diagram of one embodiment of a liquid helium free superconducting magnet rapid cooling apparatus;

FIG. 2 is a block diagram of one embodiment of a quick release device;

wherein: 1-normal temperature outer cylinder, 2-magnet coil barrel, 3-contact I, 4-contact II, 5-vacuum chamber, 6-temperature probe, 7-quick-release device, 71-adjusting rod, 72-telescopic structure, 73-rotary structure, 74-gasket, 75-heat insulation element; 8-flexible connection structure.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the combination or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, are not to be construed as limiting the present invention. In addition, in the description process of the embodiment of the present invention, the positional relationships of the devices such as "upper", "lower", "front", "rear", "left", "right", and the like in all the drawings are based on fig. 1.

As shown in fig. 1, a quick cooling device for a liquid-helium-free superconducting magnet is used for cooling a normal-temperature outer cylinder 1 and a magnet coil barrel 2 sleeved in the normal-temperature outer cylinder, and is characterized in that: the rapid cooling device comprises a contact I3 and a contact II4, wherein:

one end of the contact I3 is connected to the primary cold head of the GM refrigerator, and the other end of the contact I3 is connected with the contact II4 or separated from the contact II4 through the quick release device 7;

the contact II4 is fixed on the magnet coil barrel 2 and is in surface contact with the contact I3;

as shown in fig. 2, the quick release device 7 is generally welded and fixed to the normal temperature outer cylinder 1 (which is a part of the vacuum container), and has an adjusting lever 71 and a rotating structure 73;

the adjusting rod 71 is provided with one end connected with the contact I3 through the heat insulation element 75, the other end extends out of the normal temperature outer cylinder 1 so as to be rotated to be opened or closed, the heat insulation element 75 is made of epoxy glass fiber reinforced plastic materials and the like, the heat insulation element has a good heat insulation effect, one end of the heat insulation element 75 can be directly adhered and fixed on the end part of the adjusting rod 71, and the other end of the heat insulation element 75 can be adhered and fixed on the contact I3;

the rotating structure 73 is sleeved on the adjusting rod 71 through a threaded matching structure and used for rotating to open or close the quick-release device 7, and a telescopic structure 72 is arranged between the bottom of the rotating structure and the heat insulation element 75 so as to press the contact I3 to the contact II4 to be attached or separated in a loosening mode.

The magnet coil barrel 2 of the quick cooling device for the liquid-helium-free superconducting magnet is also connected with a temperature probe 9 for measuring the temperature of the magnet coil barrel 2, so that the quick release device 7 is controlled to disconnect the contact I3 and the contact II4, and then the magnet coil barrel 2 is continuously cooled by using a secondary cold head. The more preferable embodiment is that the temperature probe 9 is further connected with a temperature display device for displaying the temperature of the magnet coil barrel, or the control device is further connected with the display device to display the temperature of the magnet coil barrel, so as to assist the operator to control the quick-release device to disconnect the magnet coil barrel and enable the magnet coil barrel to be independently cooled to 4 k.

The contact I3 and the contact II4 of the quick cooling device for the liquid-helium-free superconducting magnet are made of one or two of oxygen-free copper, copper and aluminum, the main selection principle is that the contact I3 and the contact II4 are made of materials with high conduction thermal coefficients and low price, and the two contacts can be well popularized and applied. The more preferable embodiment is that the contact surfaces of the contact I3 and the contact II4 are mirror-finished, so that the heat conduction speed between the primary cold head and the secondary cold head magnet coil barrel is better enhanced, and the cooling speed of the magnet coil barrel is improved. A vacuum cavity 5 is arranged between the normal temperature outer cylinder 1 and the magnet coil barrel 2, so that the contact I3 is more tightly attached to the contact II4, and the good refrigeration effect is ensured in the contact heat transfer process.

The rotating structure 73 of the quick cooling device for the liquid-helium-free superconducting magnet can be designed into a nut or handwheel structure, and a gasket 74 is pressed between the rotating structure 73 and the normal-temperature outer cylinder 1 and used for enhancing the connecting structure of the rotating structure and the normal-temperature outer cylinder. The better embodiment is a liquid helium-free superconducting magnet rapid cooling device, the contact I3 is connected with the primary cold head through a soft connection structure 8, and the soft connection structure is made of a copper woven mesh belt or a multi-layer copper foil belt, so that a certain expansion amount is ensured between the contact I and the primary cold head, the area of a surface contact part of the contact I and the contact II can be ensured to be relatively large, and the refrigeration efficiency can be improved.

The contact area of the contact I3 and the contact II4 of the liquid helium-free superconducting magnet rapid cooling device is more than 100cm²The thickness of each of the contact I3 and the contact II4 is more than 10mm, so that proper cold energy transmission is ensured. More preferably, the telescopic structure 72 is a welded bellows with a wall thickness less than 0.5mm, and the telescopic stroke is greater than 100mm, the bellows is typically welded to the bottom of the gasket 74 or directly welded to the bottom of the rotating structure 73, and the length of the telescopic structure is preferably 2-3 times of the telescopic stroke.

The embodiments of the present invention are disclosed as the preferred embodiments, but not limited thereto, and those skilled in the art can easily understand the spirit of the present invention and make various extensions and changes without departing from the spirit of the present invention.