CN202404221U - Damping type cold-junction container for superconducting magnet - Google Patents
Damping type cold-junction container for superconducting magnet Download PDFInfo
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- CN202404221U CN202404221U CN2011202951643U CN201120295164U CN202404221U CN 202404221 U CN202404221 U CN 202404221U CN 2011202951643 U CN2011202951643 U CN 2011202951643U CN 201120295164 U CN201120295164 U CN 201120295164U CN 202404221 U CN202404221 U CN 202404221U
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Abstract
The damping type cold-junction container for a superconducting magnet is characterized by comprising the components of a cold-junction container upper flange (21), a cold-junction container lower flange (22), a corrugated tube (13), a primary stainless steel thin-walled tube (14), a cold-junction container primary heat transfer flange (15), a secondary stainless steel thin-walled tube (18), a magnetic shielding cylinder (16), a bottom connection corrugated tube (20), etc. The corrugated tube (13) is provided between the cold-junction container upper flange (21) and the cold-junction container lower flange (22); the upper portion of the primary stainless steel thin-walled tube (14) is connected to the cold-junction container upper flange (21) by argon arc welding, and the lower portion is connected to the cold-junction container primary heat transfer flange (15) by vacuum soldering; the lower portion of the cold-junction container primary heat transfer flange (15) is connected to the secondary stainless steel thin-walled tube (18); the bottom of the secondary stainless steel thin-walled tube (18) is provided with the corrugated tube (20); the sleeve of the secondary stainless steel thin-walled tube (18) is provided with the magnetic shielding cylinder (16); and a GM refrigerating machine (6) or a pulsation refrigerating machine (7) is provided in the cold-junction container (1).
Description
Technical field
[0001] the utility model relates to superconducting magnet and uses cold-junction container, and the superconducting magnet that is specially adapted to liquid helium zero volatilization superconducting magnetic resonance imaging and nuclear magnetic resonance spectrometer superconducting magnet is used the damping type cold-junction container.
Background technology
[0002] present; The whole imaging system of nuclear magnetic resonance is according to the characteristics of cell atom nucleus band micromagnetism; Can apply special variable magnetic field to a certain position of human body, observe the changed condition of certain atom in magnetic field then, be aided with computer image analysis technique; Just can obtain the information of tissue, help to confirm diseased region.Superconducting magnet is attended by the most momentous results in the application of medical science, and superconducting magnet is compared with permanent magnet, electromagnet that we know, has the advantages that volume is little, in light weight, power consumption is few, magnetic field intensity is high.In the medical magnetic resonance field,, must use certain high field intensity superconducting magnet in order to obtain to stablize high-quality image.
The superconduction nuclear magnetic resonance generally uses liquid helium as refrigerant; For superconducting coil is set up and maintenance superconduction environment; Therefore magnet adopts the vacuum multilayer insulation structure, but because multiple factors such as support structure can not stop heat conduction fully; So liquid helium can be taken the heat of importing out of with the form of evaporation, to keep the temperature of 4. 2K.For reducing the evaporation of liquid helium, be typically equipped with refrigeration system on the superconduction nuclear magnetic resonance so that cold to be provided, reduce the liquid helium evaporation.Refrigeration system comprises cold head, compressor, three parts of water-cooled unit.Cold head is a refrigeration part, for superconducting magnet provides 4K and 50K two-stage low temperature.Zero volatilizees the superconducting magnet dewar container mainly by 4.2K, 50K and 300K three double-walled cartridge types container and neck tube, and cold-junction container and other supporting parts are formed.Wherein the 50K container is cold screen, 4.2K, and the 300K container is processed with 304 magnetism-free stainless steels.50K cold screen is in order to reduce the radiant heat transfer between liquid helium temperature and the room temperature.
Magnetic resonance imaging requires superconducting magnet to have the magnetic field of high evenness.Refrigeration machine is installed on and is used to cool off the magnet cryogenic system in the cold-junction container.Gifford-Mcmahon refrigeration machine (being called for short the 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 simple in structure, many advantages such as running is reliable, stable performance, long service life.Compare the GM refrigeration machine with other refrigeration machines and have the big characteristics of refrigerating capacity, be widely used in the magnetic resonance image-forming superconducting magnet.But the athletic meeting of GM refrigeration machine inner carrier produces vibration, and vibration reaches whole magnet through each coupling arrangement, with the homogeneity that influences magnetic field.Thereby the scan image quality is exerted an influence.For preventing that vibration from exerting an influence to magnetic resonance imaging system, in the design of cold-junction container, can avoid the propagation vibrated through the travel path that blocks vibration.The method that reduces transfer of vibration has and avoids the use of hard hot tie-in, and uses vibration absorber such as corrugated tube.Pulse tube refrigerating machine is not owing to there is moving piston, thereby compares almost not vibration with the GM refrigeration machine.Using pulse tube refrigerating machine also is to reduce to vibrate the method that improves image quality.Along with the alternative GM refrigeration machine of the continuous increase of pulse tube refrigerating machine refrigerating capacity is used to cool off the magnet cryogenic system.
Summary of the invention
The purpose of the utility model is to provide a kind of superconducting magnet of GM refrigeration machine and pulse tube refrigerating machine that can be applicable to simultaneously to use the damping type cold-junction container.
The technical scheme of the utility model is:
A kind of superconducting magnet is used the damping type cold-junction container, comprises 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 compositions such as corrugated tube.Be provided with the vibration damping corrugated tube between said cold-junction container upper flange and the cold-junction container lower flange; One-level stainless-steel thin-wall pipe top is connected through argon arc welding with the cold-junction container upper flange; The bottom is connected through vacuum brazing with cold-junction container one-level heat transfer flange; Cold-junction container one-level heat transfer flange bottom is connected with the secondary stainless-steel thin-wall pipe, and secondary stainless-steel thin-wall pipe bottom is provided with corrugated tube, and the secondary stainless-steel thin-wall pipe is arranged with magnetic shielding cylinder outward; GM refrigeration machine or pulse tube refrigerating machine are set in the said 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 spacing is 0.5 millimeter to 1.5 millimeters between the GM refrigeration machine one-level cold head of GM refrigeration machine and the cold-junction container one-level heat transfer flange.GM refrigeration machine secondary cold head is positioned at the 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 said pulse tube refrigerating machine is crimped on the cold-junction container one-level heat transfer flange, and its height is by the adjustment of adjustment sealing ring.Simultaneously the pulse tube refrigerating machine finned cooler heat interchanging area of pulse tube refrigerating machine is greater than GM refrigeration machine finned cooler, thereby remedies the little shortcoming of pulse tube refrigerating machine refrigerating capacity.
Like Fig. 4, the said cold-junction container upper flange that is characterised in that is fixed on the refrigeration machine supporting bracket.Support height can be regulated through bolt.The cold-junction container bottom is connected with the room temperature vacuum tank.If use pulse tube refrigerating machine, upper flange is fixed on the lower flange through 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 compact more.
Said characteristic magnetic shielding cylinder material is generally highly purified oxygen-free copper or aluminium.Can adhere to one deck Wood's metal for improving on its shield effectiveness surfaces externally and internally.
The beneficial effect of the utility model is:
The cold-junction container that the utility model proposes can effectively be avoided refrigeration machine transfer of vibration to whole magnet.And this cold-junction container can be applicable to GM refrigeration machine and pulse tube refrigerating machine simultaneously.Through changing refrigeration machine top adjustment sealing ring different refrigeration machines are compensated at length direction.If when using the GM refrigeration machine, refrigeration machine places in the 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 ground.
The superconducting magnet of the utility model is applicable to GM refrigeration machine and pulse tube refrigerating machine simultaneously with the damping type cold-junction container, and the client can freely select the refrigeration machine type according to service condition, thereby interchangeability is stronger.
Description of drawings
Fig. 1 is the structural representation of the superconducting magnet of magnetic resonance imaging system.
Fig. 2 is the cold-junction container and the GM refrigeration machine mounting structure synoptic diagram of the utility model.
Fig. 3 is the cold-junction container and the pulse tube refrigerating machine mounting structure synoptic diagram of the utility model.
Fig. 4 is that the utility model is installed in the structural representation on the cold-junction container bracing frame.
Among 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 the neck tube assembly;
Fig. 2; Among Fig. 3: 6 is the GM refrigeration machine; 7 is pulse tube refrigerating machine; 8 for regulating bolt; 11 is refrigeration machine one-level cold head; 12 is refrigeration machine secondary cold head; 13 is the vibration damping corrugated tube; 14 is the one-level stainless-steel thin-wall pipe; 15 is cold-junction container one-level heat transfer flange; 16 is magnetic shielding cylinder; 17 is the GM refrigerator condenser; 18 is the secondary stainless-steel thin-wall pipe; 19 is the cold-junction container flange in the bottom; 20 is corrugated tube; 21 is the cold-junction container upper flange; 22 is the cold-junction container lower flange; 23 is the pulse tube refrigerating machine condenser; 24 is pulse tube refrigerating machine one-level cold head; 25 are the adjustment sealing ring;
Among 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 the adjusting bolt.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described:
As shown in Figure 2; A kind of superconducting magnet is used the damping type cold-junction container, comprises 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 compositions such as corrugated tube 20.Be provided with vibration damping corrugated tube 13 between said cold-junction container upper flange 21 and the cold-junction container lower flange 22; One-level stainless-steel thin-wall pipe 14 tops and cold-junction container upper flange 21 are connected through argon arc welding; Bottom and cold-junction container one-level heat transfer flange 15 are connected through vacuum brazing; Cold-junction container one-level heat transfer flange 15 bottoms are connected with secondary stainless-steel thin-wall pipe 18, and secondary stainless-steel thin-wall pipe 18 bottoms are provided with corrugated tube 20, the secondary stainless-steel thin-wall pipe 18 outer magnetic shielding cylinders 16 that are arranged with; GM refrigeration machine 6 or pulse tube refrigerating machine 7 are set in the said 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 spacing is 0.5 millimeter to 1.5 millimeters between the GM refrigeration machine one-level cold head 11 of GM refrigeration machine 6 and the cold-junction container one-level heat transfer flange 15.Owing to the helium coefficient of heat conductivity is big, the vibration that motion produced of GM refrigeration machine inner carrier simultaneously makes the further raising of helium gas molecules motion aggravation heat-transfer effect on the surface of contact, thereby the refrigerating capacity that has guaranteed refrigeration machine can effectively reach on the 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 the cold-junction container one-level heat transfer flange 15, and its height is by 25 adjustment of adjustment sealing ring.For guaranteeing between two heat-transfer areas excellent contact is arranged, be pressed with the very thin indium sheet of one deck between surface of contact.Directly contact and do not use helium heat conduction to remedy 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 have been strengthened the heat exchange effect greater than GM refrigeration machine finned cooler 17 simultaneously.
As shown in Figure 4, cold-junction container upper flange 21 is fixed on the refrigeration machine supporting bracket 50.Support 50 height can be regulated through bolt 51.Cold-junction container 1 bottom is connected with room temperature vacuum tank 20.If use pulse tube refrigerating machine 7, because not vibration of refrigeration machine, upper flange is fixed on the lower flange 22 through 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 compact more.
In 4K GM refrigeration machine 6 pistons magnetic fillers is housed.For reducing piston motion magnet center magnetic field is produced interference, 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 the Wood's metal critical transition temperature is (B=0) about 8K, thereby resistance is zero when temperature is 4K.Thereby make shield effectiveness more effective.
Embodiment recited above describes the preferred implementation of the utility model; Be not that design and scope to the utility model limits; Do not breaking away under the utility model design concept prerequisite; Common engineering technical personnel make the technical scheme of the utility model in this area various modification and improvement all should fall into the protection domain of the utility model, and the technology contents that the utility model is asked for protection all is documented in claims.
Claims (6)
1. a superconducting magnet is used the damping type cold-junction container; It is characterized in that comprising 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) are connected corrugated tube (20) with the bottom; Be provided with vibration damping corrugated tube (13) between said cold-junction container upper flange (21) and the cold-junction container lower flange (22); One-level stainless-steel thin-wall pipe (14) top is connected through argon arc welding with cold-junction container upper flange (21); The bottom is connected through 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 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 the said cold-junction container (1).
2. superconducting magnet according to claim 1 is used the damping type cold-junction container; The GM refrigeration machine one-level cold head (11) that it is characterized in that said GM refrigeration machine (6) does not contact with cold-junction container one-level heat transfer flange (15); Spacing is 0.5 millimeter to 1.5 millimeters between the GM refrigeration machine one-level cold head (11) of GM refrigeration machine (6) and the cold-junction container one-level heat transfer flange (15); 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.
3. superconducting magnet according to claim 1 is used the damping type cold-junction container; The pulse tube refrigerating machine one-level heat transfer flange (24) that it is characterized in that said pulse tube refrigerating machine (7) is crimped on the cold-junction container one-level heat transfer flange (15); Its height is by adjustment 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.
4. use the damping type cold-junction container according to the described superconducting magnet of one of claim 1 to 3; It is characterized in that said cold-junction container upper flange (21) is fixed on the refrigeration machine supporting bracket (50); Support (50) height can be regulated through regulating bolt (51), and cold-junction container (1) bottom is connected with room temperature vacuum tank (20).
5. use the damping type cold-junction container according to the described superconducting magnet of one of claim 1 to 3, it is characterized in that said if use pulse tube refrigerating machine (7), cold-junction container upper flange (21) is fixed on the lower flange (22) through set bolt (8).
6. use the damping type cold-junction container according to the said superconducting magnet of claim 1, be characterised in that on said magnetic shielding cylinder (16) surfaces externally and internally and adhere to one deck Wood's metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202951643U CN202404221U (en) | 2011-08-15 | 2011-08-15 | Damping type cold-junction container for superconducting magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202951643U CN202404221U (en) | 2011-08-15 | 2011-08-15 | Damping type cold-junction container for superconducting magnet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202404221U true CN202404221U (en) | 2012-08-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202951643U Withdrawn - After Issue CN202404221U (en) | 2011-08-15 | 2011-08-15 | Damping type cold-junction container for superconducting magnet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202404221U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102323557A (en) * | 2011-08-15 | 2012-01-18 | 南京丰盛超导技术有限公司 | Superconducting magnet is used the damping type cold-junction container |
| CN106091461A (en) * | 2016-06-12 | 2016-11-09 | 铜陵海科锐科技有限公司 | High-gain energy-saving type deep cooling machine |
| CN106960713A (en) * | 2017-03-23 | 2017-07-18 | 杭州图锐科技有限公司 | A kind of refrigeration machine for superconducting magnet it is jacket structured and its install, method for dismounting |
| CN117269865A (en) * | 2023-11-20 | 2023-12-22 | 中国科学院电工研究所 | High-field animal magnetic resonance imaging conduction cooling superconducting magnet structure |
-
2011
- 2011-08-15 CN CN2011202951643U patent/CN202404221U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102323557A (en) * | 2011-08-15 | 2012-01-18 | 南京丰盛超导技术有限公司 | Superconducting magnet is used the damping type cold-junction container |
| CN106091461A (en) * | 2016-06-12 | 2016-11-09 | 铜陵海科锐科技有限公司 | High-gain energy-saving type deep cooling machine |
| CN106960713A (en) * | 2017-03-23 | 2017-07-18 | 杭州图锐科技有限公司 | A kind of refrigeration machine for superconducting magnet it is jacket structured and its install, method for dismounting |
| CN117269865A (en) * | 2023-11-20 | 2023-12-22 | 中国科学院电工研究所 | High-field animal magnetic resonance imaging conduction cooling superconducting magnet structure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120829 Effective date of abandoning: 20140115 |
|
| RGAV | Abandon patent right to avoid regrant |