CN102323557B - Vibration reduction type cold head container for superconducting magnet - Google Patents
Vibration reduction type cold head container for superconducting magnet Download PDFInfo
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- CN102323557B CN102323557B CN201110233058.7A CN201110233058A CN102323557B CN 102323557 B CN102323557 B CN 102323557B CN 201110233058 A CN201110233058 A CN 201110233058A CN 102323557 B CN102323557 B CN 102323557B
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Abstract
The invention discloses a vibration reduction type cold head container for a superconducting magnet. The container is characterized by comprising a cold head container upper flange (21), a cold head container lower flange (22), a corrugated pipe (13), a primary stainless steel thin-wall pipe (14), a cold head container primary heat-conducting flange (15), a secondary stainless steel thin-wall pipe (18), a magnetic shielding cylinder (16), a bottom connecting corrugated pipe (20) and the like, wherein the vibration reduction corrugated pipe (13) is arranged between the cold head container upper flange (21) and the cold head container lower flange (22); the upper part of the primary stainless steel thin-wall pipe (14) is connected with the cold head container upper flange (21) in an argon arc welding manner, and the lower part of the primary stainless steel thin-wall pipe (14) is connected with the cold head container primary heat-conducting flange (15) in a vacuum brazing manner; the lower part of the cold head container primary heat-conducting flange (15) is connected with the secondary stainless steel thin-wall pipe (18); the bottom of the secondary stainless steel thin-wall pipe (18) is provided with the corrugated pipe (20); the magnetic shielding cylinder (16) is sleeved outside the secondary stainless steel thin-wall pipe (18); and a GM (Gifford-Mcmahon) refrigerator (6) or a pulse tube refrigerator (7) is arranged in the cold head container (1).
Description
Technical field
The present invention relates to superconducting magnet cold-junction container, be specially adapted to the vibration reduction type cold head container for superconducting magnet of liquid helium zero volatilization superconducting magnetic resonance imaging and nuclear magnetic resonance spectrometer superconducting magnet.
Background technology
At present, the whole imaging system of nuclear magnetic resonance is according to the feature of cell atom nucleus band micromagnetism, can apply special variable magnetic field to a certain position of human body, then observe the changed condition of certain atom in magnetic field, be aided with computer image analysis technique, just can obtain the information of tissue, help to determine diseased region.Superconducting magnet is attended by the most momentous results in the application of medical science, and permanent magnet, electromagnet that superconducting magnet is known with us are compared, and has the advantages that volume is little, lightweight, power consumption is few, magnetic field intensity is high.In medical magnetic resonance field, in order to obtain the image of stable high-quality amount, must use certain high field intensity superconducting magnet.
Superconduction nuclear magnetic resonance is generally used liquid helium as refrigerant, for superconducting coil is set up and maintenance superconduction environment, therefore magnet adopts vacuum multilayer insulation structure, but due to many factors such as support structure, can not stop heat conduction completely, so liquid helium can be taken the heat of importing out of with the form of evaporation, to maintain the temperature of 4. 2K.For reducing the evaporation of liquid helium, on superconduction nuclear magnetic resonance, be typically equipped with refrigeration system so that cold to be provided, reduce liquid helium evaporation.Refrigeration system comprises cold head, compressor, three parts of water chiller.Cold head is refrigeration part, for superconducting magnet provides 4K and 50K two-stage low temperature.Zero volatilizees superconducting magnet dewar container mainly by 4.2K, tri-double-walled cartridge type containers of 50K and 300K and neck tube, and cold-junction container and other supporting parts form.Wherein 50K container is cold screen, 4.2K, and 300K container is made with 304 magnetism-free stainless steels.The cold screen of 50K is in order to reduce radiant heat transfer between liquid helium temperature and room temperature.
Magnetic resonance imaging requires superconducting magnet to have the magnetic field of high evenness.Refrigeration machine is installed in cold-junction container for cooling magnet cryogenic system.Gifford-Mcmahon refrigeration machine (being called for short GM refrigeration machine) is a kind of backheating type small size Cryo Refrigerator, it utilizes adiabatic degassing (be called again west the cover expand) principle that expands to obtain low temperature, has many advantages such as simple in structure, running is reliable, stable performance, long service life.Compare GM refrigeration machine with other refrigeration machines and have the advantages that refrigerating capacity is large, be widely used in magnetic resonance image-forming superconducting magnet.But the athletic meeting of GM refrigeration machine inner carrier produces vibration, vibration reaches whole magnet by each coupling arrangement, will affect the homogeneity in magnetic field.Thereby scan image mass formation is affected.For preventing that vibration from exerting an influence to magnetic resonance imaging system, in the design of cold-junction container, can avoid by blocking the travel path of vibration the propagation of vibration.The method that reduces vibration transmission has avoids using hard hot tie-in, and uses the vibration absorbers such as corrugated tube.Pulse tube refrigerating machine is owing to there is no moving piston, thereby compares almost not vibration with GM refrigeration machine.Using pulse tube refrigerating machine is also to reduce the method that vibration improves image quality.Along with the alternative GM refrigeration machine of continuous increase of pulse tube refrigerating machine refrigerating capacity is for cooling magnet cryogenic system.
Summary of the invention
The object of the present invention is to provide a kind of vibration reduction type cold head container for superconducting magnet that can simultaneously be applicable to GM refrigeration machine and pulse tube refrigerating machine.
Technical scheme of the present invention is:
, comprise that cold-junction container upper flange, cold-junction container lower flange, corrugated tube, one-level stainless-steel thin-wall pipe, cold-junction container one-level heat transfer flange, secondary stainless-steel thin-wall pipe, magnetic shielding cylinder, bottom connect several parts such as corrugated tube and form.Between described cold-junction container upper flange and cold-junction container lower flange, be provided with vibration damping corrugated tube, one-level stainless-steel thin-wall pipe top is connected by argon arc welding with cold-junction container upper flange, bottom is connected by vacuum brazing with cold-junction container one-level heat transfer flange, cold-junction container one-level heat transfer flange bottom is connected with secondary stainless-steel thin-wall pipe, secondary stainless-steel thin-wall pipe bottom is provided with corrugated tube, and secondary stainless-steel thin-wall pipe is arranged with magnetic shielding cylinder outward; GM refrigeration machine or pulse tube refrigerating machine are set in described cold-junction container.
As shown in Figure 2, GM refrigeration machine one-level cold head does not contact with cold-junction container one-level heat transfer flange, and between the GM refrigeration machine one-level cold head of GM refrigeration machine and cold-junction container one-level heat transfer flange, spacing is 0.5 millimeter to 1.5 millimeters.GM refrigeration machine secondary cold head is positioned at secondary stainless-steel thin-wall pipe, and finned cooler is equipped with in its bottom.
As shown in Figure 3, the pulse tube refrigerating machine one-level heat transfer flange of described pulse tube refrigerating machine is crimped on cold-junction container one-level heat transfer flange, and its height is adjusted by adjusting sealing ring.The pulse tube refrigerating machine finned cooler heat interchanging area of pulse tube refrigerating machine is greater than GM refrigeration machine finned cooler simultaneously, thereby makes up the shortcoming that pulse tube refrigerating machine refrigerating capacity is little.
As Fig. 4, described in be characterised in that cold-junction container upper flange is fixed on refrigeration machine supporting bracket.Support height can regulate by bolt.Cold-junction container bottom is connected with room temperature vacuum tank.If use pulse tube refrigerating machine, upper flange is fixed on lower flange by set bolt, and paired pulses pipe refrigeration machine provides support.At this moment can not use supporting bracket, thereby simplify installation process, make whole magnet compacter.
Described feature magnetic shielding cylinder material is generally highly purified oxygen-free copper or aluminium.For improving on its shield effectiveness surfaces externally and internally, can adhere to one deck Wood's metal.
The invention has the beneficial effects as follows:
The cold-junction container that the present invention proposes, can effectively avoid refrigeration machine vibration to be passed to whole magnet.And this cold-junction container can be applicable to GM refrigeration machine and pulse tube refrigerating machine simultaneously.By changing refrigeration machine top adjustment sealing ring, different refrigeration machines are compensated at length direction.If while using GM refrigeration machine, refrigeration machine is placed in cold-junction container, but does not directly contact with cold-junction container heat transfer flange.Refrigeration machine passes through independently supporting construction, and vibration is reached to ground.
Vibration reduction type cold head container for superconducting magnet of the present invention is applicable to GM refrigeration machine and pulse tube refrigerating machine simultaneously, and client can freely select refrigeration machine type according to service condition, thereby interchangeability is stronger.
Accompanying drawing explanation
Fig. 1 is the structural representation of the superconducting magnet of magnetic resonance imaging system.
Fig. 2 is cold-junction container of the present invention and GM refrigeration machine mounting structure schematic diagram.
Fig. 3 is cold-junction container of the present invention and pulse tube refrigerating machine mounting structure schematic diagram.
Fig. 4 is that the present invention is arranged on the structural representation on cold-junction container bracing frame.
In Fig. 1: 1 is that cold-junction container, 2 is that room temperature vacuum tank, 3 is that the cold screen of 50K radiation proof, 4 is that liquid helium vessel, 5 is neck tube assembly;
Fig. 2, in Fig. 3: 6 is GM refrigeration machine, 7 is pulse tube refrigerating machine, 8 is adjusting bolt, 11 is refrigeration machine one-level cold head, 12 is refrigeration machine secondary cold head, 13 is vibration damping corrugated tube, 14 is one-level stainless-steel thin-wall pipe, 15 is cold-junction container one-level heat transfer flange, 16 is magnetic shielding cylinder, 17 is GM refrigerator condenser, 18 is secondary stainless-steel thin-wall pipe, 19 is cold-junction container flange in the bottom, 20 is corrugated tube, 21 is cold-junction container upper flange, 22 is cold-junction container lower flange, 23 is pulse tube refrigerating machine condenser, 24 is pulse tube refrigerating machine one-level cold head, 25 for adjusting sealing ring,
In Fig. 4: 1 is that cold-junction container, 8 is that set bolt, 20 is that room temperature urceolus, 30 is that room temperature hole, 40 is that base, 50 is that magnet carrier, 51 is adjusting bolt.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described:
As shown in Figure 2,, comprise that cold-junction container upper flange 21, cold-junction container lower flange 22, corrugated tube 13, one-level stainless-steel thin-wall pipe 14, cold-junction container one-level heat transfer flange 15, secondary stainless-steel thin-wall pipe 18, magnetic shielding cylinder 16, bottom connect several parts such as corrugated tube 20 and form.Between described cold-junction container upper flange 21 and cold-junction container lower flange 22, be provided with vibration damping corrugated tube 13, one-level stainless-steel thin-wall pipe 14 tops are connected by argon arc welding with cold-junction container upper flange 21, bottom is connected by vacuum brazing with cold-junction container one-level heat transfer flange 15, cold-junction container one-level heat transfer flange 15 bottoms are connected with secondary stainless-steel thin-wall pipe 18, secondary stainless-steel thin-wall pipe 18 bottoms are provided with corrugated tube 20, the outer magnetic shielding cylinder 16 that is arranged with of secondary stainless-steel thin-wall pipe 18; Interior GM refrigeration machine 6 or the pulse tube refrigerating machine 7 of arranging of described cold-junction container 1.
gM refrigeration machine one-level cold head 11 does not contact with cold-junction container one-level heat transfer flange 15, and between the GM refrigeration machine one-level cold head 11 of GM refrigeration machine 6 and cold-junction container one-level heat transfer flange 15, spacing is 0.5 millimeter to 1.5 millimeters.Because helium coefficient of heat conductivity is large, the vibration that the motion of GM refrigeration machine inner carrier produces simultaneously makes helium gas molecules motion aggravation on surface of contact further improve heat-transfer effect, thereby has guaranteed that the refrigerating capacity of refrigeration machine can effectively reach on cold-junction container heat transfer flange.GM refrigeration machine secondary cold head 12 is positioned at secondary stainless-steel thin-wall pipe 18, and finned cooler 17 is equipped with in its bottom.
As shown in Figure 3, the pulse tube refrigerating machine one-level heat transfer flange 24 of pulse tube refrigerating machine 7 is crimped on cold-junction container one-level heat transfer flange 15, and its height is adjusted by adjusting sealing ring 25.For guaranteeing there is good contact between two heat-transfer areas, between surface of contact, be pressed with the indium sheet of thin layer.Directly contact and do not use helium heat conduction to make up the little shortcoming of pulse tube refrigerating machine refrigerating capacity.Pulse tube refrigerating machine finned cooler 23 heat interchanging areas of pulse tube refrigerating machine 7 are greater than GM refrigeration machine finned cooler 17 simultaneously, have strengthened heat transfer effect.
As shown in Figure 4, cold-junction container upper flange 21 is fixed on refrigeration machine supporting bracket 50.Support 50 height can regulate by bolt 51.Cold-junction container 1 bottom is connected with room temperature vacuum tank 20.If use pulse tube refrigerating machine 7, due to not vibration of refrigeration machine, upper flange is fixed on lower flange 22 by set bolt 8, and paired pulses pipe refrigeration machine provides support.At this moment can not use supporting bracket 50, thereby simplify installation process, dwindle installation dimension and made whole magnet compacter.
The in-built filler that is magnetic of 4K GM refrigeration machine 6 pistons.For reducing piston movement, magnet center magnetic field is produced and disturbed, thereby magnetic shielding cylinder 16 is housed outside secondary stainless-steel thin-wall pipe 18.Magnetic shielding cylinder 16 is generally rafifinal (RRR > 1000) or oxygen-free copper.For guaranteeing that its shield effectiveness can adhere to one deck Wood's metal on magnetic shielding cylinder 16 surfaces externally and internallies.Because Wood's metal critical transition temperature is 8K left and right (B=0), thereby resistance is zero when temperature is 4K.Thereby make shield effectiveness more effective.
Embodiment recited above is described the preferred embodiment of the present invention; not the spirit and scope of the present invention are limited; do not departing under design concept prerequisite of the present invention; various modification and improvement that in this area, common engineering technical personnel make technical scheme of the present invention; all should fall into protection scope of the present invention, the technology contents that the present invention asks for protection is all documented in claims.
Claims (3)
1. a vibration reduction type cold head container for superconducting magnet, it is characterized in that comprising cold-junction container upper flange (21), cold-junction container lower flange (22), vibration damping corrugated tube (13), one-level stainless-steel thin-wall pipe (14), cold-junction container one-level heat transfer flange (15), secondary stainless-steel thin-wall pipe (18), magnetic shielding cylinder (16) is connected corrugated tube (20) with bottom, between described cold-junction container upper flange (21) and cold-junction container lower flange (22), be provided with vibration damping corrugated tube (13), one-level stainless-steel thin-wall pipe (14) top is connected by argon arc welding with cold-junction container upper flange (21), bottom is connected by vacuum brazing with cold-junction container one-level heat transfer flange (15), cold-junction container one-level heat transfer flange (15) bottom is connected with secondary stainless-steel thin-wall pipe (18), secondary stainless-steel thin-wall pipe (18) bottom is provided with bottom and connects corrugated tube (20), the outer magnetic shielding cylinder (16) that is arranged with of secondary stainless-steel thin-wall pipe (18), GM refrigeration machine (6) or pulse tube refrigerating machine (7) are set in described cold-junction container (1), the GM refrigeration machine one-level cold head (11) of described GM refrigeration machine (6) does not contact with cold-junction container one-level heat transfer flange (15), between the GM refrigeration machine one-level cold head (11) of GM refrigeration machine (6) and cold-junction container one-level heat transfer flange (15), spacing is 0.5 millimeter to 1.5 millimeters, the GM refrigeration machine secondary cold head (12) of GM refrigeration machine (6) is positioned at secondary stainless-steel thin-wall pipe (18), and finned cooler (17) is equipped with in its bottom, the pulse tube refrigerating machine one-level heat transfer flange (24) of described pulse tube refrigerating machine (7) is crimped on cold-junction container one-level heat transfer flange (15), its height is by adjusting sealing ring (25) adjustment, and pulse tube refrigerating machine finned cooler (23) heat interchanging area of pulse tube refrigerating machine (7) is greater than GM refrigeration machine finned cooler (17) simultaneously, it is upper that described cold-junction container upper flange (21) is fixed on refrigeration machine supporting bracket (50), and support (50) height can pass through adjusting bolt (51) and regulate, and cold-junction container (1) bottom is connected with room temperature vacuum tank (2).
2. vibration reduction type cold head container for superconducting magnet according to claim 1, while it is characterized in that, in cold-junction container (1), pulse tube refrigerating machine (7) is set, cold-junction container upper flange (21) is fixed on cold-junction container lower flange (22) by set bolt (8).
3. vibration reduction type cold head container for superconducting magnet according to claim 1, is characterized in that adhering to one deck Wood's metal on described magnetic shielding cylinder (16) surfaces externally and internally.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110233058.7A CN102323557B (en) | 2011-08-15 | 2011-08-15 | Vibration reduction type cold head container for superconducting magnet |
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| CN201110233058.7A CN102323557B (en) | 2011-08-15 | 2011-08-15 | Vibration reduction type cold head container for superconducting magnet |
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| CN102323557B true CN102323557B (en) | 2014-01-15 |
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| CN117346391B (en) * | 2023-12-04 | 2024-02-20 | 万气精仪(苏州)气体设备有限公司 | Condenser for GM refrigerator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB2329701B (en) * | 1997-09-30 | 2001-09-19 | Oxford Magnet Tech | Load bearing means in nmr cryostat systems |
| CN100424443C (en) * | 2007-06-04 | 2008-10-08 | 中国科学院上海技术物理研究所 | Integrated cold head used for co-axial pulse tube refrigerator |
| CN101923148B (en) * | 2010-05-21 | 2013-06-05 | 南京丰盛超导技术有限公司 | Compact cold-junction container for superconductive magnet |
| CN202404221U (en) * | 2011-08-15 | 2012-08-29 | 南京丰盛超导技术有限公司 | Damping type cold-junction container for superconducting magnet |
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