CN102313130A - Quench gas drain system used for MRI superconducting magnet low temperature container - Google Patents
Quench gas drain system used for MRI superconducting magnet low temperature container Download PDFInfo
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- CN102313130A CN102313130A CN201110247203A CN201110247203A CN102313130A CN 102313130 A CN102313130 A CN 102313130A CN 201110247203 A CN201110247203 A CN 201110247203A CN 201110247203 A CN201110247203 A CN 201110247203A CN 102313130 A CN102313130 A CN 102313130A
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- safety valve
- branch road
- rupture disk
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- 238000010791 quenching Methods 0.000 title claims abstract description 133
- 239000007789 gas Substances 0.000 claims abstract description 57
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims abstract description 52
- 239000001307 helium Substances 0.000 claims abstract description 50
- 229910052734 helium Inorganic materials 0.000 claims abstract description 50
- 239000007788 liquid Substances 0.000 claims abstract description 39
- 229910001220 stainless steel Inorganic materials 0.000 claims description 8
- 239000010935 stainless steel Substances 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 6
- 239000005030 aluminium foil Substances 0.000 claims description 5
- 238000009835 boiling Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 4
- 238000005336 cracking Methods 0.000 claims description 3
- LENZDBCJOHFCAS-UHFFFAOYSA-N tris Chemical compound OCC(N)(CO)CO LENZDBCJOHFCAS-UHFFFAOYSA-N 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 abstract 2
- 230000037361 pathway Effects 0.000 abstract 2
- 238000005516 engineering process Methods 0.000 description 7
- 230000006378 damage Effects 0.000 description 3
- 230000000171 quenching effect Effects 0.000 description 3
- 230000001960 triggered effect Effects 0.000 description 3
- 238000005422 blasting Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000002887 superconductor Substances 0.000 description 1
- 230000000699 topical effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- Containers, Films, And Cooling For Superconductive Devices (AREA)
Abstract
The invention relates to a quench gas drain system used for a MRI superconducting magnet low temperature container, which comprises a quench detector (1), an electric control safety valve (3), a rupture disk (4), a magnetic end quench exhaust main line (5), a side exhaust branch of the safety valve (6), a side exhaust branch of the rupture disk (7) and an environmental end quench exhaust main line (8). When the quench detector (1) detects that the a superconducting magnet (2) quenches, the electric control safety valve (3) is controlled to switch on, volatile gas (12) in a liquid helium vessel (10) is drained out along a discharge pathway of the magnetic end quench exhaust main line (5), the side exhaust branch of the safety valve (6) and the environmental end quench exhaust main line (8). The quenched high-temperature superconducting magnet (2) transfers the heat to liquid helium (11), so that the pressure in the liquid helium vessel (10) continues to raise, the passive triggering rupture disk (4) is ruptured when the rupture disk (4) reaches the operating pressure, the other discharge pathway conducts.
Description
Technical field
The present invention relates to a kind of safety relief system that is used for the superconducting magnet low-temperature (low temperature) vessel.
Background technique
The MRI superconducting magnet is usually operated at the liquid helium warm area, because the very high temperature homogeneity of the very big requirement of magnet size so be immersed in the liquid helium usually, adopts the liquid helium immersion way to cool off more.Superconducting magnet is composed in series by a plurality of coaxial superconducting coils usually, and in order to reduce the leakage heat of system, employing can be pulled out the current feed power supply mostly.The superconducting magnet excitation in order to satisfy the time stability requirement in magnetic field, generally adopts the temp-control type superconducting switch to realize the superconducting coil closed loop behind operating current, extracts the superconducting magnet current feed then, and electric current moves in the superconducting coil of closed loop.
The Where topical energy perturbation surpass superconductor minimum quench can the time; Quench propagation can take place in superconducting coil, and along with the expansion in quench zone, normal state resistance constantly increases; And then making the electromagnetism energy storage of superconducting coil constantly convert Joule heat into, the heating superconducting coil makes its temperature continue to raise.Because the superconducting coil zones of different is quench successively, if the too high magnet that will cause of the zone temperature rise of first quench damages.Too high in order to make regional area be unlikely to temperature rise, need take certain quench protection measure.The quench protection technology of development has outer resist technology and interior resist technology at present: outer resist technology is when magnet quenching, part energy to be discharged into the magnet outside, and the simplest implementation is that ability resistance is released in outside of parallel connection in room temperature environment; Interior resist technology is that energy is released in the magnet equably, and the most of regional temperature of magnet is raise equably, and this resist technology adopts sectionalised protection and heater loop to trigger each coil of superconducting magnet and the quick quench of zones of different usually.The operation with closed ring mode of MRI superconducting magnet has determined the quench protection mode to adopt interior resist technology, and diverter constitutes the sectionalised protection circuit with the protection diode, and the quick quench of different coils is triggered with protective resistance in the heater loop.
Because whole energy storage of MRI superconducting magnet all consume in magnet, be in the quick boiling that the superconducting magnet of high-temperature can cause liquid helium very much, produce a large amount of volatilization gas, container inner pressure is sharply raise.If the helium of volatilization can not in time be discharged, the pressure in the liquid helium vessel surpasses the destruction that the highest allowable pressure of container will cause liquid helium vessel.
The passive mode of releasing that existing quench gas bleed-off system adopts quench gas exhaust piping and rupture disk to constitute; The low-temperature end of quench gas exhaust piping links to each other with liquid helium vessel; The other end communicates with atmosphere environment, and rupture disk generally is installed in through being threaded on one section pipeline near room temperature of quench gas exhaust piping.Rupture disk was hedged off from the outer world out helium when magnet normally moved, in case the pressure in the liquid helium vessel reaches the operating pressure of rupture disk, rupture disk breaks the pipeline conducting, and helium is discharged along the quench gas exhaust piping.The shortcoming of this gas bleed-off system is that speed of response is slow, has only the gas that when the pressure in the liquid helium vessel reaches the cracking pressure of rupture disk, volatilizees to discharge along pipeline; In addition, if rupture disk inefficacy cisco unity malfunction, container inner pressure will constantly raise until the final container failure damage.
Summary of the invention
The objective of the invention is to the present invention proposes a kind of quench gas bleed-off system of superconducting magnet low-temperature (low temperature) vessel in order to overcome the shortcoming that existing superconducting magnet quench bleed-off system speed of response is slow, Safety performance is not high.The volatilization gas that the bleed-off system that the present invention proposes can cause magnet quenching is effectively in time discharged, and has increased the gas discharge area, has strengthened the safety in operation of superconducting magnet system.
Quench gas bleed-off system of the present invention composes in parallel by initiatively triggering gas path and the passive triggering gas path of releasing of releasing.System of the present invention is installed in the top of magnets helium vessel, is connected with liquid helium vessel through magnet end quench exhaust main line, welds together with the liquid helium vessel shell after magnet end quench exhaust main line passes vacuum vessel and vacuum sandwich.The slotted line of drawing of the quench detection device of described system is connected with the voltage tap of superconducting magnet, forms bridge detection circuit.Initiatively trigger the gas path of releasing and control first triggering by the quench of superconducting magnet, the passive triggering gas path of releasing is controlled the back by the gas pressure in the liquid helium vessel and is triggered.
The gas path of releasing that initiatively triggers of the present invention is made up of quench prober, automatically controlled safety valve, magnet end quench exhaust main line, safety valve side exhaust branch road and environment end quench exhaust main line.The described gas that initiatively triggers is released in the path; The output interface of quench prober and the input interface of automatically controlled safety valve link together; The indoor temperature end of magnet end quench exhaust main line is connected with safety valve side exhaust branch road through threeway, and the other end of safety valve side exhaust branch road is connected with environment end quench exhaust main line through threeway.Described automatically controlled safety valve is installed in through being threaded in the pipeline of safety valve side exhaust branch road.
Described magnet end quench exhaust main line is made up of one section Stainless Steel Tube, and magnet end quench exhaust main line is positioned at vacuum vessel and is surrounded by aluminium foil with the outer surface of exterior portions; The exhaust of safety valve side is propped up route multistage Stainless Steel Tube and is welded, and outer surface is surrounded by aluminium foil; Environment end quench exhaust main line also is welded by the multistage Stainless Steel Tube, and its caliber is a bit larger tham magnet end quench exhaust main line.
Described automatically controlled safety valve is controlled by the quench prober.After the quench prober detects magnet quenching; Sending the automatically controlled safety valve of SC sigmal control opens; Probably need the time of a few tens of milliseconds to the hundreds of millisecond from detecting the superconducting magnet quench to the safety valve unlatching, the path that the helium in the liquid helium vessel is formed along magnet end quench exhaust main line, safety valve side exhaust branch road and environment end quench exhaust main line is discharged.
The passive triggering gas of the present invention path of releasing is made up of rupture disk, magnet end quench exhaust main line, rupture disk side exhaust branch road and environment end quench exhaust main line.Described rupture disk is installed in the pipeline of rupture disk side exhaust branch road.Described rupture disk side exhaust branch road is the pipeline by the welding of multistage Stainless Steel Tube; Outer surface is surrounded by aluminium foil; One end of rupture disk side exhaust branch road links together through threeway and magnet end exhaust main line, and the other end of rupture disk side exhaust branch road links together through threeway and environment end quench exhaust main line; Rupture disk is the blasting device that the layer of metal sheet constitutes, and is installed in through being threaded on the rupture disk side exhaust branch road, and the setting pressure of rupture disk is generally 0.25～0.3MPa.Be in the quick boiling that the superconducting magnet of high-temperature causes liquid helium very much after the quench; Produce a large amount of volatilization gas; When the pressure in the magnet end quench exhaust main line reaches the operating pressure of rupture disk; Rupture disk breaks, and the path of releasing that a part of helium is formed along magnet end quench exhaust main line, rupture disk side exhaust branch road and environment end quench exhaust main line is discharged.
Described gas release path and passive triggering gas the release same magnet end of path sharing quench exhaust main line and the environment end quench exhaust main line of initiatively triggering.
Quench gas bleed-off system of the present invention is applicable to the MRI superconducting magnet system, particularly adopts liquid helium to soak the MRI superconducting magnet system of cooling.
Description of drawings
Fig. 1 is the structural drawing of quench gas bleed-off system, among the figure: 1 quench prober, 2 quench detection loops, 3 automatically controlled safety valves, 4 rupture disks, 5 magnet end quench exhaust main lines, 6 safety valve side exhaust branch roads, 7 rupture disk side exhaust branch roads, 8 environment end quench exhaust main lines, 2 superconducting magnets;
Fig. 2 is the location diagram of quench gas bleed-off system and superconducting magnet, among the figure: 9 vacuum vessels, 10 liquid helium vessels, 11 liquid heliums, 12 helium.
Embodiment
Further specify the present invention below in conjunction with accompanying drawing and embodiment.
Quench gas bleed-off system of the present invention composes in parallel by initiatively triggering gas path and the passive triggering gas path of releasing of releasing.Described quench gas bleed-off system is installed in the top of liquid helium vessel; Be connected with liquid helium vessel through magnet end quench exhaust main line; Weld together with the liquid helium vessel shell after magnet end quench exhaust main line passes vacuum vessel and vacuum sandwich, the slotted line of drawing of the quench detection device of described system is connected with the voltage tap of superconducting magnet.
The described gas path of releasing that initiatively triggers is made up of quench prober 1, automatically controlled safety valve 3, magnet end quench exhaust main line 5, safety valve side exhaust branch road 6 and environment end quench exhaust main line 8.
The measurement lighting outlet of quench prober 1 is connected with the voltage tap of superconducting magnet 2, forms bridge-type voltage detecting loop.The output interface of quench prober 1 is connected with the control input of automatically controlled safety valve 3; Magnet end quench exhaust main line 5 is one section Stainless Steel Tube, and the housing of its low-temperature end and liquid helium vessel 10 welds together, and its indoor temperature end is connected with safety valve side exhaust branch road 6 through threeway; Safety valve side exhaust branch road 6 is welded by Stainless Steel Tube, and the other end of safety valve side exhaust branch road 6 is connected with environment end quench exhaust main line 8 through threeway.Environment end quench exhaust main line 8 also is welded by the multistage Stainless Steel Tube, and its caliber is a bit larger tham magnet end quench exhaust main line 5.Automatically controlled safety valve 3 is installed in through being threaded in the pipeline of safety valve side exhaust branch road 6.
The passive triggering gas of the present invention path of releasing is made up of rupture disk 4, magnet end quench exhaust main line 5, rupture disk side exhaust branch road 7 and environment end quench exhaust main line 8.
Described rupture disk 4 is blasting devices that the layer of aluminum film constitutes, and is installed in through being threaded in the pipeline of rupture disk side exhaust branch road 7.One end of rupture disk side exhaust branch road 7 links together through threeway and magnet end exhaust main line 5, and the other end of rupture disk side exhaust branch road 7 links together through threeway and environment end quench exhaust main line 8.
Described gas release path and passive triggering gas the release same magnet end of path sharing quench exhaust main line 5 and the environment end quench exhaust main line 8 of initiatively triggering.
After quench prober 1 detects superconducting magnet 2 quench, send electrical signal and control automatically controlled safety valve 3 unlatchings, open the time that needs the hundreds of millisecond approximately from detecting superconducting magnet 9 quench to automatically controlled safety valve 3.After automatically controlled safety valve 3 triggered, the helium 12 in the liquid helium vessel 10 was formed pipe passage along magnet end quench exhaust main line 5, safety valve side exhaust branch road 6 and environment end quench exhaust main line 8 and is discharged.The temperature of the superconducting magnet 2 after the quench is very high, and the liquid helium 11 in the liquid helium vessel 10 directly contacts with the very high superconducting magnet 2 of temperature, because the great amount of heat transmission; Make constantly boiling in 11 short time of liquid helium; Helium constantly rises and accumulates in gas-phase space, and the pressure in the liquid helium vessel 10 continues to raise, when pressure is elevated to the cracking pressure 0.25MPa of rupture disk 4; The path conducting of releasing of the passive triggering gas at rupture disk side exhaust branch road 7 place, a part of helium 12 flows out along this pipe passage.
Fig. 2 is the location diagram of quench gas bleed-off system of the present invention and superconducting magnet.The low-temperature end and the liquid helium vessel 10 of magnet end quench exhaust main line 5 weld together, and link to each other with rupture disk side exhaust branch road 7 with safety valve side exhaust branch road 6 respectively after passing vacuum sandwich and vacuum vessel 9; The other end of environment end quench exhaust main line 8 directly is an atmosphere environment.The part of the measurement lighting outlet of magnet end quench exhaust main line 5 and quench detection device 1 is in the low temperature environment, and a part is in the room temperature environment.Quench prober 1, automatically controlled safety valve 3, rupture disk 4, safety valve side exhaust branch road 6, rupture disk side exhaust branch road 7 and environment end quench exhaust main line 8 are arranged in room temperature environment.
Claims (6)
1. a quench gas bleed-off system that is used for MRI superconducting magnet low-temperature (low temperature) vessel is characterized in that, described quench gas bleed-off system composes in parallel by initiatively triggering gas path and the passive triggering gas path of releasing of releasing; The described gas path of releasing that initiatively triggers is made up of quench prober (1), automatically controlled safety valve (3), magnet end quench exhaust main line (5), safety valve side exhaust branch road (6) and environment end quench exhaust main line (8), and the described passive triggering gas path of releasing is made up of rupture disk (4), magnet end quench exhaust main line (5), rupture disk side exhaust branch road (7) and environment end quench exhaust main line (8); The described gas that initiatively triggers is released in the path, and the measurement lighting outlet of quench prober (1) is connected with the voltage tap of superconducting magnet (2), forms bridge-type voltage detecting loop; The output interface of quench prober (1) is connected with the control input of automatically controlled safety valve (3); The housing of the low-temperature end of magnet end quench exhaust main line (5) and liquid helium vessel (10) welds together, and the indoor temperature end of magnet end quench exhaust main line (5) is connected with safety valve side exhaust branch road (6) through threeway; The other end of safety valve side exhaust branch road (6) is connected with environment end quench exhaust main line (8) through threeway; Described automatically controlled safety valve (3) is installed in the pipeline of safety valve side exhaust branch road (6); Described passive triggering gas is released in the path; Rupture disk (4) is installed in the pipeline of rupture disk side exhaust branch road (7); One end of rupture disk side exhaust branch road (7) is connected with magnet end exhaust main line (5) through threeway, and the other end of rupture disk side exhaust branch road (7) is connected with environment end quench exhaust main line (8) through threeway; Described gas release path and passive triggering gas the release same magnet end of path sharing quench exhaust main line (5) and the environment end quench exhaust main line (8) of initiatively triggering.
2. according to the described quench gas of claim 1 bleed-off system; It is characterized in that; The described gas path of releasing that initiatively triggers is controlled the unlatching of automatically controlled safety valve (3) through quench prober (1); Quench prober (1) detects the quench of superconducting magnet (2); Initiatively trigger automatically controlled safety valve (3) then and open, the path of releasing that the volatilization gas (12) in the liquid helium vessel (10) is formed along magnet end quench exhaust main line (5), safety valve side exhaust branch road (6) and environment end quench exhaust main line (8) is discharged; Liquid helium (11) in the liquid helium vessel (10) directly contacts with the superconducting magnet (2) of high temperature; Make liquid helium (11) constantly boiling at short notice; Helium constantly rises and accumulates in gas-phase space, and the pressure in the liquid helium vessel (10) continues to raise, when pressure is elevated to the cracking pressure of rupture disk (4); The path conducting of releasing of the passive triggering gas at rupture disk side exhaust branch road (7) place, a part of helium (12) flows out along this pipe passage.
3. according to the described quench gas of claim 1 bleed-off system, it is characterized in that the pressure the when operating pressure of described rupture disk (4) will be higher than automatically controlled safety valve (3) unlatching in the liquid helium vessel (10) is 0.25～0.3MPa.
4. according to the described quench gas of claim 1 bleed-off system; It is characterized in that; Described bleed-off system is positioned at the top of liquid helium vessel (10); The housing of magnet end quench exhaust main line (5) and liquid helium vessel (10) welds together, and links to each other with rupture disk side exhaust branch road (7) with safety valve side exhaust branch road (6) respectively after passing vacuum sandwich and vacuum vessel (9); The directly logical atmosphere of the other end of environment end quench exhaust main line (8); The part of the measurement lighting outlet of magnet end quench exhaust main line (5) and quench detection device (1) is in the low temperature environment, and another part is in the room temperature environment; Quench prober (1), automatically controlled safety valve (3), rupture disk (4), safety valve side exhaust branch road (6), rupture disk side exhaust branch road (7) and environment end quench exhaust main line (8) are arranged in room temperature environment.
5. according to the described quench gas of claim 1 bleed-off system, it is characterized in that described magnet end quench exhaust main line (5), safety valve side exhaust branch road (6), rupture disk side exhaust branch road (7) and environment end quench exhaust main line (8) are welded by Stainless Steel Tube; Described magnet end quench exhaust main line (5) is positioned at vacuum vessel (9) and is surrounded by aluminium foil with the outer surface of exterior portions; Described safety valve side exhaust branch road (6) and described rupture disk side exhaust branch road (7) outer surface are surrounded by aluminium foil.
6. according to the described quench gas of claim 1 bleed-off system, it is characterized in that the caliber of described environment end quench exhaust main line (8) is a bit larger tham the caliber of magnet end quench exhaust main line (5).
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110247203 CN102313130B (en) | 2011-08-24 | 2011-08-24 | Quench gas drain system used for MRI superconducting magnet low temperature container |
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| CN 201110247203 CN102313130B (en) | 2011-08-24 | 2011-08-24 | Quench gas drain system used for MRI superconducting magnet low temperature container |
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| CN102313130B CN102313130B (en) | 2013-06-26 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103574114A (en) * | 2013-10-29 | 2014-02-12 | 大连理工大学 | Active and passive bifunctional superpressure relief device and superpressure relief method |
| CN103775699A (en) * | 2012-10-25 | 2014-05-07 | 上海联影医疗科技有限公司 | Superconducting magnet pressure release valve and pressure release system |
| CN104884969A (en) * | 2012-12-27 | 2015-09-02 | 皇家飞利浦有限公司 | System and method for quench protection of a cryo-free super conducting magnet |
| CN108417338A (en) * | 2018-05-21 | 2018-08-17 | 哈尔滨工业大学 | The horizontal superconducting magnet helium vessel of sandwich |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103775699A (en) * | 2012-10-25 | 2014-05-07 | 上海联影医疗科技有限公司 | Superconducting magnet pressure release valve and pressure release system |
| CN103775699B (en) * | 2012-10-25 | 2015-11-25 | 上海联影医疗科技有限公司 | A kind of superconducting magnet Pressure Relief Valve and pressure releasing system |
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| CN103574114A (en) * | 2013-10-29 | 2014-02-12 | 大连理工大学 | Active and passive bifunctional superpressure relief device and superpressure relief method |
| CN108417338A (en) * | 2018-05-21 | 2018-08-17 | 哈尔滨工业大学 | The horizontal superconducting magnet helium vessel of sandwich |
| CN108417338B (en) * | 2018-05-21 | 2020-05-15 | 哈尔滨工业大学 | Horizontal superconducting magnet helium container with sandwich structure |
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